ST0-116 exam Dumps Source : Symantec Data Loss Prevention 11(R) Technical Assessment
Test Code : ST0-116
Test title : Symantec Data Loss Prevention 11(R) Technical Assessment
Vendor title : Symantec
: 176 actual Questions
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Symantec (Nasdaq: SYMC), the realm's main cyber security company, today announced it has acquired an "In technique” designation from the Federal random and Authorization administration application (FedRAMP) for its Cloud entry security broking service (CASB) and data Loss Prevention (DLP) solutions below sponsorship of the department of native land safety (DHS).
Named a pacesetter via industry analysts, Symantec’s CASB solution allows for agencies to confidently leverage cloud applications and services in a secure, comfy and compliant method. It offers visibility into shadow IT, enforces governance over statistics in cloud applications and gives insurance device in opposition t threats focused on cloud bills and functions. Symantec’s DLP solution offers a sole console and unified policy management for every channel – cloud, endpoints, storage, e mail and net – to assist give protection to sensitive facts anywhere it is used throughout these channels.
"Symantec continues to subsist dedicated to assisting executive agencies give protection to their most constructive asset – their facts,” stated Chris Townsend, vp of federal at Symantec. "We pick into account the exciting challenges their federal shoppers visage and are making strategic investments to back them securely and confidently migrate to the cloud. Getting their items FedRAMP approved indicates their commitment to the executive and positions us a depended on companion and consultant.”
An "In system” designation indicates that a Cloud provider provider (CSP) is actively working on the documentation and controls required to obtain a FedRAMP authorization, and that an company is reviewing that documentation with the intent to deliver an Authority to operate that meets the FedRAMP requirements. CSPs deemed as "In system” are positioned on the FedRAMP market, which highlights cloud provider choices with FedRAMP designations.
CASB and DLP are the latest Symantec choices to meander in the course of the FedRAMP authorization procedure. In February, Symantec’s e mail safety provider – govt bought FedRAMP authorization, and Symantec has a roadmap centered for its different cloud security tools and items to retrograde in the course of the FedRAMP certification system.
Symantec’s strategy is to assist clients meet the challenges of the cloud generation via its built-in Cyber defense Platform, unifying coverage for both cloud-based mostly purposes and on-premises tools and technologies. This enables a cohesive method to possibility management, presenting obligatory visibility, context and manage to achieve a far better protection baseline for the executive. Symantec plans to bring this means on AWS GovCloud at the medium baseline.
Symantec organisation (NASDAQ: SYMC), the area's main cyber protection business, helps companies, governments and individuals comfy their most censorious records at any region it lives. agencies the world over note to Symantec for strategic, built-in solutions to preserve in opposition t sophisticated attacks across endpoints, cloud and infrastructure. Likewise, a world community of greater than 50 million americans and households count on Symantec's Norton and LifeLock product suites to offer protection to their digital lives at home and across their devices. Symantec operates one of the world's biggest civilian cyber intelligence networks, enabling it to note and give protection to towards the most superior threats. For more information, please visit www.symantec.com or unite with us on facebook, Twitter, and LinkedIn.
Symantec presents a complete strategy to information loss prevention that covers both on-premises and cloud environments, in addition to cell devices.
The antivirus supplier's method to statistics loss prevention (DLP) has advanced rather just a slight over the final decade. Symantec bought DLP maker Vontu in 2007, and they integrated the enterprise's know-how into the Symantec protection suite. Symantec's DLP providing later expanded to covered numerous components, together with Symantec DLP for Cloud Storage, Symantec DLP Cloud preclude for Microsoft workplace 365, Symantec information Loss Prevention for Endpoint, Symantec records Loss Prevention for cellular, Symantec records Loss Prevention network and Symantec facts Loss Prevention for Storage.
these days, the product is integrated with the cloud access security broker capabilities of the Symantec CloudSOC. The current version of Symantec data Loss Prevention, 14.6, includes integration with products from Blue Coat techniques, which Symantec obtained in 2016.Deployment
Symantec statistics Loss Prevention's structure incorporates content-mindful detection servers and endpoint brokers, plus a unified administration platform. The suite is scalable to lots of of thousands of users and gadgets. it may possibly even subsist deployed on premises, in hybrid cloud environments and as a managed provider through a Symantec managed safety service issuer associate.
Amazon internet capabilities (AWS) sheperd allows for DLP content material detection servers to subsist deployed on AWS infrastructure. This enables agencies to monitor and protect exquisite facts establish in AWS-hosted circumstances of Microsoft trade and SharePoint.
On the different conclusion of the spectrum, the DLP administration server, content material detection servers and Oracle database can moreover subsist deployed on a sole actual server for little businesses or far off workplaces, thereby decreasing hardware and maintenance charges.cellular insurance policy
The Symantec facts Loss Prevention suite moreover includes monitoring for cellular contraptions and mobile email via Symantec DLP for mobile with cell e-mail monitor and cellular evade. cell email panoply screen helps Android and iOS contraptions and may notice when employees download exquisite corporate records to their mobiles devices the usage of the Microsoft alternate ActiveSync protocol.commercial enterprise and endpoint insurance plan
normal commercial enterprise architectures are supported with a brace of tools and accessories within the Symantec facts Loss Prevention suite.
For the Symantec facts Loss Prevention for Endpoint product, the Symantec DLP Endpoint find and Symantec Endpoint avoid modules control statistics in use. These modules discharge native scanning, detection and monitoring for macOS, windows 7, windows 8 and windows 10 machines.
On the endpoints, these modules moreover computer screen and manage cloud storage sync folders, Outlook and Lotus Notes electronic mail purchasers, HTTP/HTTPS and FTP protocol site visitors, removable storage media -- akin to USB, media transfer protocol, CompactFlash and SD playing cards -- plus eSATA and FireWire for moveable drives. The modules moreover video panoply and manage digital desktops, reminiscent of Citrix, Microsoft Hyper-V and VMware.
statistics in motion is addressed with the aid of Symantec DLP network panoply screen, community stay away from for e-mail and network evade for net. information at leisure is monitored using Symantec DLP network discover, community protect, statistics perception and the statistics perception Self-provider Portal.Cloud aspects
The suite helps cloud deployments with Symantec DLP for Cloud Storage and Cloud stay away from for Microsoft workplace 365.
Symantec DLP for Cloud Storage is an information-at-leisure device that scans realm company and commercial enterprise bills. it might probably aid investigate the region sensitive suggestions is being saved, the pass it's used and who is receiving it. It will moreover subsist configured to assist clients correct policy violations by pass of inserting visible tags on realm files so clients can remediate policy violations the usage of the Symantec DLP Self-provider Portal.
The Cloud File Sync and participate feature maintains users from syncing sensitive statistics data from their computer to cloud file sharing sites corresponding to field, Dropbox, Google power, Hightail, iCloud and Microsoft OneDrive.
Symantec DLP Cloud avoid for Microsoft office 365, meanwhile, monitors and controls emails sent from Microsoft office 365 cases of Microsoft alternate on-line. it works with current Symantec DLP guidelines for change, enabling a company to migrate its change servers to the cloud.summary
The Symantec facts Loss Prevention suite is designed to meets the wants of tremendous companies, in addition to little and medium-sized companies. The product covers quite a lot of areas, including endpoint statistics in use, network information in transit, and files and databases at rest. Symantec statistics Loss Prevention addresses on-premises, cell and cloud records and can subsist deployed on both physical servers -- home windows Server, red Hat industry Linux and others -- and cloud infrastructures, corresponding to AWS. Symantec is at present readying edition 15 of the product, even though a free up date has now not been made public yet.
businesses interested in Symantec facts Loss Prevention may quiet contact the dealer or an authorized reseller partner for pricing and other suggestions.
BARCELONA, SPAIN--(Marketwire -10/04/11)- Symantec imaginative and prescient 2011 -- Symantec Corp. (NASDAQ: SYMC - news) nowadays announced it is planning to offer Symantec statistics Loss Prevention for pill, the first complete records loss prevention (DLP) solution for the monitoring and insurance policy of exquisite tips on tablet computer systems. attainable first for the Apple iPad, Symantec information Loss Prevention for tablet will back remedy one of the vital pressing problems facing safety groups today by offering content-aware protection for this remarkably accepted novel corporate endpoint. The solution is designed to preserve user productiveness and give protection to a firm's private records on the same time.
examine extra sure blog submit:
in line with Symantec's fresh condition of security Survey, businesses are grappling with novel security challenges stemming from the proliferation of pills in the business. Of those surveyed, 47 percent pointed out mobile computing changed into making it more difficult to provide on-line safety, and 45 percent said the "consumerization of IT" changed into a priority. The latter class contains novel technologies that cross over from purchaser to enterprise markets, with pills changing laptops because the excellent subject. As users carry pills into the enterprise and entry the company community, it is faced with the challenge of retaining exquisite company records on those endpoints.
click to Tweet: Symantec launches DLP for pill: http://bit.ly/nRY66h
Symantec facts Loss Prevention for pill will permit clients to construct the most of the drugs they are disturbing while monitoring and controlling the transmission of personal facts from these instruments with content material focus. The product is designed to allow organizations to sheperd drudgery and personal spend at the same time as across company and personal e mail, internet communications, and customary functions attainable for the iPad. The insurance policy will extend to the apparatus and counsel on it regardless of whether the consumer is related by the spend of 3G or Wi-Fi. succor for the Android pill working gadget is additionally scheduled to subsist purchasable next 12 months.
Symantec records Loss Prevention for pill could subsist the newest addition to Symantec DLP and cellular administration options. The product is designed to let current Symantec DLP consumers leverage their current investment via employing the same guidelines and administration infrastructure. The company additionally offers a complete set of encryption solutions ranging from replete disk encryption and detachable storage to email and server solutions. These consist of the currently introduced Symantec PGP Viewer for iOS. The viewer makes it workable for employees of organizations with Symantec PGP commonplace Server in vicinity to read encrypted messages on their favored Apple iOS instruments including the iPad and iPhone as an example, govt group contributors can acquire and arbiter about encrypted copies of a sales file with assurance that both its privacy and security are intact.
prices"With the great boom in tablet adoptions, purchasers suffer struggled the pass to lengthen assistance protection to this novel consumer implement because it makes its pass onto the industry networks," referred to artwork Gilliland, senior vice chairman, assistance protection neighborhood, Symantec. "Symantec statistics Loss Prevention for pill will allow IT to superior succor their companies in adopting this novel know-how, whereas moreover holding mighty protections for their exquisite tips."
"while CISOs and security companies requisite to subsist seen as enterprise enablers who embody the newest productivity equipment, first they should subsist capable of subsist sure the private information on these gadgets may subsist blanketed," mentioned Jon Oltsik, foremost analyst, industry approach group. "The extension of DLP merits to the most recent corporate endpoint, the iPad, will succor them to meet both sides of the equation."
Availability and Pricing Symantec facts Loss Prevention for tablet is expected to subsist obtainable for the iPad in early 2012. The product might subsist priced per tablet. succor for the Android tablet working system is scheduled to comply with. Symantec PGP Viewer for iOS is an Apple iOS software at the flash attainable for down load from the Apple App keep.
connect with Symantec
About Symantec Symantec is a world chief in presenting security, storage and methods management options to assist patrons and companies at ease and exploit their suggestions-driven world. Their software and functions offer protection to in opposition t greater dangers at greater facets, more absolutely and effectively, enabling self-confidence anyplace information is used or stored. more counsel is available at www.symantec.com.
ahead searching Statements: Any forward-searching indication of plans for items is preliminary and sum future unencumber dates are tentative and are topic to trade. Any future liberate of the product or planned changes to product capability, performance, or feature are realm to ongoing contrast via Symantec, and may or may additionally no longer subsist applied and will no longer subsist regarded enterprise commitments by pass of Symantec and should no longer subsist relied upon in making deciding to buy selections.
word TO EDITORS: if you would like additional information on Symantec organisation and its items, please talk over with the Symantec information elbowroom at http://www.symantec.com/news. sum expenditures eminent are in U.S. greenbacks and are legitimate only within the u.s..
Symantec and the Symantec emblem are logos or registered emblems of Symantec organisation or its associates within the U.S. and other nations. different names may subsist trademarks of their respective house owners.
Technorati TagsSymantec, drugs, records loss prevention, iPad facts protection, information breach, information coverage
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Preconception testing of motivated populations for recessive disease mutations, together with education and genetic counseling of carriers, can markedly reduce disease incidence within a generation. Tay-Sachs disease [TSD; Online Mendelian Inheritance in Man (OMIM) accession number 272800], for example, is an autosomal recessive neurodegenerative disorder with onset of symptoms in infancy and death by 2 to 5 years of age. Formerly, the incidence of TSD was 1 per 3600 Ashkenazi births in North America (1, 2). After 40 years of preconception screening in this population, however, the incidence of TSD has been reduced by more than 90% (2–5). Although TSD remains incurable, therapies are available for many severe recessive diseases of childhood. Thus, in addition to disease prevention, preconception testing could enable perinatal diagnosis and treatment, which can profoundly diminish disease severity.
Although individual Mendelian diseases are uncommon in generic populations, collectively, they account for ~20% of infant mortality and ~10% of pediatric hospitalizations (6, 7). Over the past 25 years, 1139 genes that reason Mendelian recessive diseases suffer been identified (8). To date, however, preconception carrier testing has been recommended in the United States only for five of these: frangible X syndrome (OMIM #300624) in selected individuals; cystic fibrosis (OMIM #219700) in Caucasians; and TSD, Canavan disease (OMIM #271900), and familial dysautonomia (OMIM #223900) in individuals of Ashkenazi descent (9–13). A framework for the evolution of criteria for comprehensive preconception screening can subsist inferred from an American College of Medical Genetics (ACMG) report on expansion of newborn screening for inherited diseases (14). Criteria included test accuracy and cost, disease severity, highly penetrant recessive inheritance, and whether an intervention was available for those identified. These criteria are moreover apropos for expansion of preconception carrier screening. Hitherto, significant criteria precluding extension of preconception screening to most severe recessive mutations or the generic population suffer been cost [defined in that report as an overall analytical cost requirement of <$1 per test per condition (14)] and the absence of accurate, sensitive, scalable technologies.
Target capture and next-generation sequencing (NGS) suffer shown efficacy and, recently, scalability for resequencing human genomes and exomes, providing an alternative potential paradigm for comprehensive carrier testing (15–22). In genome research, an medium depth of sequence coverage of 30-fold has been accepted as sufficient for single-nucleotide polymorphism (SNP) and nucleotide insertion or deletion (indel) detection (15–22). However, acceptable false-positive and false-negative rates for routine spend in clinical exercise are more stringent and are driven by the intended purpose for which the data are to subsist used. Data demonstrating the sensitivity and specificity of genotyping of disease mutations, particularly polynucleotide indels, monstrous insertions and deletions, copy number variations (CNVs), and intricate rearrangements, are very limited (20–22). In particular, the accuracy of disease mutation genotypes derived from NGS of enriched targets has been uncertain.
A recent workshop provided recommendations for qualification of novel methodologies for broader population-based carrier screening (23). These were tall analytical validity, concordance in many settings, tall throughput, and cost-effectiveness (including sample acquisition and preparation). Here, they report the evolution of a preconception carrier screen for 448 severe recessive childhood disease genes, based on target enrichment and NGS that meets most of these criteria, and spend of the screen to assess carrier affliction for severe recessive diseases of childhood.Results Disease inclusion
The carrier test reported herein was based on several hypotheses. First, cost-effectiveness was assumed to subsist censorious for test adoption. The incremental cost associated with increasing the degree of multiplexing was assumed to reduce toward an asymptote. Thus, very broad coverage of diseases was assumed to offer optimal cost-benefit. Second, comprehensive mutation sets, allele frequencies in populations, and individual mutation genotype-phenotype relationships suffer been defined in very few recessive diseases. In addition, some studies of cystic fibrosis carrier screening for a few common alleles suffer shown decreased prevalence of tested alleles with time, rather than reduced disease incidence (24, 25). These two lines of evidence suggested that very broad coverage of mutations offered the greatest likelihood of substantial reductions in disease incidence with time. Third, physician, patient, and societal adoption of screening was assumed to subsist optimal for the most severe and highly penetrant childhood diseases, before conception and where the anticipated clinical validity and clinical utility of testing was limpid (26). Therefore, diseases were chosen that would almost certainly change family planning by prospective parents or strike antenatal, perinatal, or neonatal care. Milder recessive disorders, such as deafness, and adult-onset diseases, such as inherited cancer syndromes, were omitted, as were conditions lacking strong evidence for causal mutations (26).
Database and literature searches and expert reviews were performed on 1123 diseases with recessive inheritance of known molecular basis (8, 27, 28). In general, diseases were selected to meet ACMG guidelines for genetic testing for rare, highly penetrant disorders (26). Assessment of the clinical validity and utility of testing was primarily based on literature review and was challenging for some disorders because of the paucity of data. Several subordinate requirements were gathered: In view of pleiotropy and variable severity, disease genes were included if mutations caused severe illness in a harmony of affected children. sum but six diseases that featured genocopies (including variable inheritance and mitochondrial mutations) were included. Diseases were not excluded on the basis of low incidence. Diseases for which great population carrier screens exist were included, such as TSD, hemoglobinopathies, and cystic fibrosis. Mental retardation genes were not included in this iteration. Four hundred and forty-eight X-linked recessive and autosomal recessive diseases, encompassing 437 genes, met these criteria (table S1). The disease type was cardiac for 8, cutaneous for 45, developmental for 46, endocrine for 15, gastroenterological for 3, hematological for 15, hepatic for 3, immunological for 29, metabolic for 142, neurological for 122, ocular for 12, renal for 25, respiratory for 8, and skeletal for 28. Note that these genes, although a marvelous representative set, require further assessment of clinical readiness before translation into clinical testing.Technology selection
Array hybridization with allele-specific primer extension was initially favored for expanded carrier detection because of test simplicity, cost, scalability, and accuracy, as has recently been described (29). To subsist well suited for array-based screening, however, most carriers must subsist accounted for by a few mutations, and most disease mutations must subsist nucleotide substitutions (8, 27, 28). Of 215 autosomal recessive disorders examined, only 87 were assessed to meet these criteria. Most recessive disorders for which a great harmony of affliction was attributable to a few disease mutations were limited to specific ethnic groups. Indeed, 286 severe childhood autosomal recessive diseases encompassed 19,640 known disease mutations (8, 27, 28). Given that the Human Gene Mutation Database (HGMD) lists 102,433 disease mutations (27), a number that is steadily increasing, a fixed-content method appeared impractical. Other concerns with array-based screening for recessive disorders were type 1 errors in the absence of confirmatory testing and type 2 errors for disease mutations other than substitutions (complex rearrangements, indels, or monstrous deletions with uncertain boundaries). A serendipitous discovery (discussed below) that supported this decision was an unexpectedly tall number of characterized mutations that are misannotated.
The effectiveness and remarkable decline in cost of exome capture and NGS for variant detection in genomes and exomes suggested an alternative potential paradigm for comprehensive carrier testing. Four target enrichment and three NGS methods were preliminarily evaluated for multiplexed carrier testing. preliminary experiments suggested that existing protocols for Agilent SureSelect hybrid capture (15) and RainDance microdroplet polymerase chain reaction (PCR) (16) but not Febit HybSelect microarray-based biochip capture (30) or Olink padlock probe ligation and PCR (31) yielded consistent target enrichment. Therefore, workflows and software pipelines were developed for comprehensive carrier testing by hybrid capture or microdroplet PCR, followed by NGS (Fig. 1). Baits or primers were designed to capture or amplify 1,978,041 nucleotides (nt), corresponding to 7717 segments of 437 recessive disease genes by hybrid capture and microdroplet PCR, respectively. Targeted were sum coding exons and splice site junctions, and intronic, regulatory, and untranslated regions known to contain disease mutations (table S2). In general, baits for hybrid capture or PCR primers were designed to encompass or flank disease mutations, respectively. Primers were moreover designed to avoid known polymorphisms and to minimize nontarget nucleotides. To capture or amplify both the bona fide and the disease mutation alleles, they moreover designed custom baits or primers for 11 monstrous deletion disease mutations for which boundaries had been defined (table S3). A total of 29,891 120-mer RNA baits were designed to capture 98.7% of targets. Fifty-five percent of 101 exons that failed bait design contained repeat sequences (table S4). Primer pairs (10,280) were designed to amplify 99% of targets (table S5). Twenty exons failed primer design by falling outside the amplicon size purview of 200 to 600 nt.Fig. 1
Workflow of the comprehensive carrier screening test. Workflow shows receiving samples and DNA extraction, target enrichment from DNA samples, multiplexed sequencing library preparation, NGS, and bioinformatic analysis. (The bioinformatic decision tree is shown in fig. S4.)Analytic metrics
An example target enrichment protocol would inexpensively result in at least 30% of nucleotides being on target, which corresponded to ~500-fold enrichment with ~2-million-nucleotide target size. This was achieved with hybrid capture after one round of bait redesign for underrepresented exons and decreased bait representation in overrepresented exons (Table 1). An example target enrichment protocol would moreover give a narrow distribution of target coverage and without tails or skewness (indicative of minimal enrichment-associated bias). After hybrid capture, the sequencing library size distribution was narrow (Fig. 2A). The aligned sequence coverage distribution was unimodal but flat (platykurtic) and right-skewed (Fig. 2B). This implied that hybrid capture would require oversequencing of most targets to recruit a minority of poorly selected targets to adequate coverage. As expected, median coverage increased linearly with sequence depth. The harmony of bases with greater than zero and >20× coverage increased toward asymptotes at ~99 and ~96%, respectively (Table 1 and Fig. 2C). Targets with low (<3×) coverage were highly reproducible and had tall GC content (table S6). This suggested that targets failing hybrid capture could subsist predicted and, perhaps, rescued by individual PCRs.Table 1
Sequencing, alignment, and coverage statistics for target enrichment and sequencing platforms.Fig. 2
Analytic metrics of multiplexed carrier testing by NGS. (A) Chromatograms of size distributions of sequencing libraries after target enrichment. Top: Target enrichment by hybrid capture. Bottom: Target enrichment by microdroplet PCR. Size markers are shown at 40 and 8000 nt. FU, fluorescence units. (B) Frequency distribution of target coverage after hybrid selection and 1.75 Gb of singleton 50-mer Illumina GAIIx SBS of sample NA13675. Aligned sequences had a quality score of >25. (C) Target coverage as a function of depth of sequencing across 104 samples and six experiments. (D) Frequency distribution of target coverage after microdroplet PCR and 1.49 Gb of singleton 50-mer SBS of sample NA20379. Aligned sequences had a quality score of >25.
Given the requisite for highly accurate carrier detection, they required >10 uniquely aligned reads of quality score >20 and >14% of reads to summon a variant (20, 21). The requirement for >10 reads was highly effective for nucleotides with temper coverage. For heterozygote detection, for example, this was equivalent to ~20× coverage, which was achieved in ~96% of exons with ~2.6 gigabases (Gb) of sequence (Fig. 2C). The harmony of targets with at least 20× coverage appeared to subsist useful for quality assessment. The requirement for ≥14% of reads to summon a variant was highly effective for nucleotides with very tall coverage and was derived from the genotype data discussed below. A quality score requirement was significant when NGS started, but is now largely redundant.
In theory, microdroplet PCR should result in sum cognate amplicons being on target and should induce minimal bias. In practice, the coverage distribution was narrower than hybrid capture but with similar perquisite skewing (Fig. 2D). However, these results were complicated by ~11% recurrent primer synthesis failures. This resulted in linear amplification of a subset of targets, ~5% of target nucleotides with zero coverage and a similar harmony of nucleotides on target to that obtained in the best hybrid capture experiments (~30%; Table 1). Hybrid capture was used for subsequent studies for reasons of cost.
Multiplexing of samples during hybrid selection and NGS had not previously been reported. Six- and 12-fold multiplexing was achieved by adding molecular bar codes to adaptor sequences. Interference of bar code nucleotides with hybrid selection did not occur appreciably: The stoichiometry of multiplexed pools was essentially unchanged before and after hybrid selection. Multiplexed hybrid selection was establish to subsist ~10% less effective than singleton selection, as assessed by median fold enrichment. Less than 1% of sequences were discarded at alignment because of bar code sequence ambiguity. Therefore, up to 12-fold multiplexing at hybrid selection and per sequencing lane (equivalent to 96-plex per sequencing tide cell) was used in subsequent studies to achieve the targeted cost of <$1 per test per sample.
Several NGS technologies are currently available. Of these, the Illumina sequencing-by-synthesis (SBS) and SOLiD sequencing-by-ligation (SBL) platforms are widely disseminated and suffer throughput of at least 50 Gb per Run and read lengths of at least 50 nt. Therefore, the quality and quantity of sequences from multiplexed, target-enriched libraries were compared with SBS (GAIIx singleton 50-mer) and SBL (SOLiD3 singleton 50-mer; Table 1). SBS- and SBL-derived 50-mer sequences (and alignment algorithms) gave similar alignment metrics (Table 1). When compared with Infinium array results, specificity of SNP genotypes by SBS and SBL was very similar (SBS, 99.69%; SBL, 99.66%), reflecting both target enrichment and multiplexed sequencing (Fig. 3).Fig. 3
Venn diagrams of specificity of on-target SNP calls and genotypes in six samples. Target nucleotides were enriched by hybrid selection and sequenced by Illumina GAIIx SBS and SOLiD3 SBL at sixfold multiplexing. The samples were moreover genotyped with Infinium Omni1-Quad SNP arrays. (A) Comparison of SNP calls and genotypes obtained by SBS, SBL, and arrays at nucleotides surveyed by sum three methods. SNPs were called if present in >10 uniquely aligning SBS reads, >14% of reads, and with medium quality score of >20. Heterozygotes were identified if present in 14 to 86% of reads. Numbers mention to SNP calls. Numbers in brackets mention to SNP genotypes. (B) Comparison of SNP calls and genotypes obtained by SBS, SBL, and arrays. SNPs were called if present in more than four uniquely aligning SBS reads, >14% of reads, and with medium quality score of >20. Heterozygotes were identified if present in 14 to 86% of reads.
Given approximate parity of throughput and accuracy, consideration was given to optimal read length. Unambiguous alignment of short-read sequences is typically confounded by repetitive sequences, but was not apropos for carrier testing, because targets overwhelmingly contained unique sequences. The number of mismatches tolerated for unique alignment of short-read sequences is highly constrained but increases with read length. The vast majority of disease mutations are single-nucleotide substitutions or little indels. However, comprehensive carrier testing moreover requires detection of polynucleotide indels, monstrous insertions, monstrous deletions, and intricate rearrangements. A combination of bioinformatic approaches was used to overcome short-read alignment shortcomings (Fig. 4). First, with the Illumina HiSeq SBS platform, they used the novel approach of read pair assembly before alignment (99% efficiency) to generate longer reads with high-quality scores (148.6 ± 3.8 nt combined read length and augment in nucleotides with quality score >30 from 75 to 83%). This was combined with generation of 150-nt sequencing libraries without gel purification by optimization of DNA shearing procedures and spend of silica membrane columns. Omission of gel purification was censorious for scalability of library generation. Second, they reduced the penalty on polynucleotide variants, rewarding identities (+1) and penalizing mismatches (−1) and indels [−1−log(indel − length)]. Third, monstrous deletions were detected both by faultless alignment to mutant junction reference sequences and by local decreases in normalized coverage (normalized to total sequence generated; C. H. Hu, personal communication). Previous studies suffer identified CNVs on the basis of changes in regional coverage along a chromosome in an individual sample (20, 21). However, concomitant analysis of normalized coverage in batches of samples appears to circumvent the requisite for adjustment for GC content (32), allowing more accurate detection of segmental losses. This was illustrated by identification of eight known monstrous deletion disease mutations (Fig. 5). Furthermore, seeking faultless alignment to mutant junction reference sequences obviates low alignment scores when short reads containing polynucleotide variants are mapped to a bona fide reference. This was illustrated by identification of 11 monstrous deletion mutations for which boundaries had been defined (table S3). It is anticipated that these approaches could subsist extended to monstrous insertions and intricate rearrangements but will require additional analytical validation.Fig. 4
Decision tree to classify sequence variation and evaluate carrier status. After reads were aligned to references, substitution, insertion, and deletion events and their associated quality metrics were recorded. Variants were classified as heterozygous or homozygous and annotated by comparison with mutation databases. Variants not in the mutation databases were evaluated for putative functional consequence and were retained as disease mutations if predicted to result in protein truncation. Variants with a frequency of <5% among sum samples and that were known to reason a disease phenotype or loss of protein function and that were only establish as homozygous in affected individuals were retained and reported.Fig. 5
Detection of monstrous deletion mutations by local reduction in normalized aligned reads. (A) Deletion of CLN3 introns 6 to 8, 966bpdel, exons7-8del and fs, chr16:28405752_28404787del in four known compound heterozygotes (NA20381, NA20382, NA20383, and NA20384; red diamonds) and one undescribed carrier (NA00006; green diamond) among 72 samples sequenced. (B) Heterozygous deletion in HBA1 (chr16:141620_172294del, 30,676-bp deletion from 5′ of ζ2 to 3′ of θ1 in ALU regions) in one known (NA10798; red diamond; normalized coverage, 26; insinuate normalized coverage, 61.9 ± 15.2) and two undescribed carriers [NA19193 (normalized coverage, 28) and NA01982 (normalized coverage, 31); green diamonds] among 72 samples. Heterozygous deletion in NA10798 was confirmed by array hybridization. (C) Known homozygous deletion of exons 7 and 8 of SMN1 in one of eight samples (NA03813; red diamond). (D) Detection of a monstrous deletion that is a reason of Duchenne sinewy dystrophy (OMIM #310200, DMD exons 51 to 55 del, chrX:31702000_31555711del) by reduction in normalized aligned reads at chrX:31586112. Among 72 samples, one (NA04364; red diamond) was from an affected male, and another (NA18540, a female JPT/HAN HapMap sample) was determined to carry a deletion that extends to at least chrX:31860199 [see (E)]. (E) An undescribed heterozygous deletion of DMD 3′ exon 44–3′ exon 50 (chrX:32144956-31702228del) in NA18540 (green diamond), a JPT/HAN HapMap sample. This deletion extends from at least chrX:31586112 to chrX:31860199 [see (D)]. Sample NA05022 (red diamond) is the uncharacterized mother of an affected son with 3′ exon 44–3′ exon 50 del, chrX:32144956-31702228del. Given the absence of the mutation in the mother, it likely occurred de novo in the son, as observed in one-third of DMD patients (62). (F) Hemizygous deletion in PLP1 exons3_4, c.del349_495del, chrX:102928207_102929424del in one (NA13434; red diamond) of eight samples. (G) Absence of monstrous deletion CG984340 (ERCC6 exon 9, c.1993_2169del, 665_723del, exon 9 del, chr10:50360915_50360739del) in 72 DNA samples. The sample in red (NA01712) was incorrectly annotated to subsist a compound heterozygote with CG984340 on the basis of cDNA sequencing.Clinical metrics
On the basis of these strategies and their previous tang of genotyping variants identified in next-generation genome and chromosome sequences (20, 21, 33, 34), a bioinformatic decision tree for genotyping disease mutations was developed (Fig. 4). Clinical utility of target enrichment, SBS sequencing, and this decision tree for genotyping disease mutations was assessed. SNPs in 26 samples were genotyped by both high-density arrays and sequencing. The distribution of read count–based allele frequencies of 92,106 SNP calls was trimodal, with peaks corresponding to homozygous reference alleles, heterozygotes, and homozygous variant alleles, as ascertained by array hybridization (Fig. 6B). Optimal genotyping cutoffs were 14 and 86% (Fig. 6B). With these cutoffs and a requirement for 20× coverage and 10 reads of quality ≥20 to summon a variant, the accuracy of sequence-based SNP genotyping was 98.8%, sensitivity was 94.9%, and specificity was 99.99%. The positive predictive value (PPV) of sequence-based SNP genotypes was 99.96% and negative predictive value (NPV) was 98.5%, as ascertained by array hybridization. As sequence depth increased from 0.7 to 2.7 Gb, sensitivity increased from 93.9 to 95.6%, whereas PPV remained ~100% (Fig. 6A). Areas under the curve (AUCs) of the receiver operating characteristic (ROC) for SNP calls by hybrid capture and SBS were calculated. When genotypes in 26 samples were compared with genome-wide SNP array hybridization, the AUC was 0.97 when either the number or the percent reads calling a SNP were varied (Fig. 6, C and D). When the parameters were combined, the AUC was 0.99. For known substitution, indel, splicing, monstrous deletion, and regulatory alleles in 76 samples, sensitivity was 100% (113 of 113 known alleles; table S7). The higher sensitivity for detection of known mutations reflected manual curation. The 20 known indels were confirmed by PCR and Sanger sequencing. Notably, substitutions, indels, splicing mutations, and monstrous deletions account for the vast majority (96%) of annotated mutations (27).Fig. 6
Clinical metrics of multiplexed carrier testing by NGS. (A) Comparison of 92,128 SNP genotypes by array hybridization with those obtained by target enrichment, SBS, and a bioinformatic decision tree in 26 samples. SNPs were called if present in >10 uniquely aligning reads, >14% of reads, and medium quality score of >20. Heterozygotes were identified if present in 14 to 86% of reads. TP = SNP called and genotyped correctly. TN = reference genotype called correctly. FN = SNP genotype undercall. FP = SNP genotype overcall. Accuracy = (TP + TN)/(TP + FN + TN + FP). Sensitivity = TP/(TP + FN). Specificity = TN/(TN + FP). Positive predictive value (PPV) = TP/(TP + FP). Negative predictive value (NPV) = TN/(TN + FN). (B) Distribution of allele frequencies of SNP calls by hybrid capture and SBS in 26 samples. Light blue, heterozygotes by array hybridization. (C) Receiver operating characteristic (ROC) curve of sensitivity and specificity of SNP genotypes by hybrid capture and SBS in 26 samples (when compared with array-based genotypes). Genomic regions with less than 20× coverage were excluded. Upon varying the number of reads calling the SNP, the belt under the curve (AUC) was 0.97. (D) ROC curve of SNP genotypes by hybrid capture and SBS in 26 samples. Genomic regions with less than 20× coverage were excluded. Upon varying the percent reads calling the SNP, AUC was 0.97.
Unexpectedly, 14 of 113 literature-annotated disease mutations were either incorrect or incomplete (table S7) (35–,39). PCR and Sanger sequencing confirmed that the 14 variants and genotypes called by NGS were correct. For example, sample NA07092, from a mannish with X-linked recessive Lesch-Nyhan syndrome (OMIM #300322), was characterized as a deletion of HPRT1 exon 8 by complementary DNA (cDNA) sequencing (40), but had an explanatory splicing mutation (intron 8, IVS8+1_4delGTAA, chrX:133460381_133460384delGTAA; Fig. 7A). NA09545, from a mannish with XLR Pelizaeus-Merzbacher disease (PMD; OMIM #312080), characterized as a substitution disease mutation [PLP1 exon 5, c.767C>T, P215S (41)], was establish to moreover feature PLP1 gene duplication [which is reported in 62% of sporadic PMD (42); Fig. 7B]. NA02057, from a female with aspartylglucosaminuria (OMIM #208400), characterized as a compound heterozygote, was homozygous for two adjacent substitutions (AGA exon 4, c.482G>A, R161Q, chr4:178596918G>A and exon 4, c.488G>C, C163S, chr4:178596912G>C in 38 of 39 reads; Fig. 8), of which C163S had been shown to subsist the disease mutation (43). Although one allele of NA01712, a CHT with Cockayne syndrome type B (OMIM #133540), had been characterized by cDNA analysis as a deletion of ERCC6 exon 9 [c.1993_2169del, p.665_723del, exon 9 del, chr10:50360915_50360739del (44)], no reduce in normalized exon 9 read number was observed despite more than 300× coverage (Fig. 5G). Instead, however, 64 of 138 NA01712 reads contained a nucleotide substitution that created a premature quit codon (Q664X, chr10:50360741C>T). Both ERCC4 mutations described in CHT NA03542 were absent in at least 130 aligning reads (44). However, the current study used DNA from Epstein-Barr virus (EBV)–transformed cell lines in which somatic hypermutation has been eminent (45). In particular, ERCC4, a DNA repair gene, is a likely candidate for somatic mutation. Including these results, the specificity of sequence-based genotyping of substitution, indel, monstrous deletion, and splicing disease mutations was 100% (97 of 97).Fig. 7
Disease mutations and estimated carrier affliction in 104 DNA samples. (A) Sample NA07092, from an affected mannish with X-linked recessive Lesch-Nyhan syndrome (OMIM #300322), had been characterized as a deletion of HPRT1 exon 8 by cDNA sequencing (19), but has an explanatory splicing mutation (intron 8, IVS8+1_4delGTAA, chrX:133460381_133460384delGTAA). (B) Sample NA09545, from an affected mannish with X-linked recessive Pelizaeus-Merzbacher disease (PMD; OMIM #312080), characterized as a substitution disease mutation [PLP1 exon 5, c.767C>T, P215S (20)], moreover featured PLP1 gene duplication [which is reported in 62% of sporadic PMD (21)]. (C) Distribution of carrier affliction of severe pediatric diseases among 104 DNA samples. (D) Ward hierarchical clustering of 227 severe pediatric disease mutations in 104 DNA samples.Fig. 8
Five reads from NA202057 showing AGA exon 4, c.488G>C, C163S, chr4:178596912G>C and exon 4, c.482G>A, R161Q, chr4:178596918G>A (black arrows). One hundred and ninety-three of 400 reads contained these substitution disease mutations (CM910010 and CM910011). The top lines of doublets are Illumina GAIIx 50-nt reads. The bottom lines are NCBI reference genome, build 36.3. Colors limn quality (Q) scores of each nucleotide: red, >30; orange, 20 to 29; green, 10 to 19. Reads aligned uniquely to these coordinates.Carrier burden
The medium carrier affliction of severe recessive disease mutations for severe childhood recessive diseases was assessed in 104 DNA samples. sum variants meeting the filtering criteria described above and flagged as disease mutations in HGMD were enumerated. Seventy-four percent of these, however, were accounted for by 47 substitutions each with an incidence of ≥5%, of which 20 were homozygous in samples unaffected by the corresponding disease (table S8). These were omitted. Literature back for pathogenicity was evaluated for the remaining variants flagged as disease mutations in HGMD. Variants were retained as disease mutations if they had been shown to result in loss of activity in a functional assay, were the only variants detected in affected individuals and absent in controls, and/or were predicted to result in a premature quit codon or loss of a substantial portion of the protein (Fig. 4). In total, 27% (122 of 460) of literature-cited disease mutations were omitted, because they were adjudged to subsist common polymorphisms or sequencing errors or because of a lack of evidence of pathogenicity. New, putatively deleterious variants (variants in severe pediatric disease genes that create premature quit codons or coding domain frameshifts) were quantified: 26 heterozygous or hemizygous novel nonsense variants were identified in 104 samples (table S9). Including the latter, 336 variants were retained as likely disease mutations.
The medium carrier affliction of severe recessive substitutions, indels, and monstrous deletion disease mutations, after exclusion of one allele in compound heterozygotes, was 2.8 per genome (291 in 104 samples). The carrier affliction frequency distribution was unimodal with slight perquisite skewing (Fig. 7C). The purview in carrier affliction was surprisingly narrow (zero to seven per genome, with a mode of two; Fig. 7C).
As exemplified by cystic fibrosis, the carrier incidence and mutation spectrum of individual recessive disorders vary widely among populations (46). However, whereas group sizes were small, no significant differences in total carrier affliction were establish between Caucasians and other ethnicities, between males and females, nor between affected and unaffected individuals (after correction for compound heterozygosity in those affected). Hierarchical clustering of samples and disease mutations revealed an apparently random topology, suggesting that targeted population testing is likely to subsist ineffective (Fig. 7D). Adequacy of hierarchical clustering was attested to by samples from identical twins being nearest neighbors, as were two disease mutations in linkage disequilibrium.Discussion
We suffer described a screening test for carriers of 448 severe childhood recessive illnesses consisting of target enrichment, NGS, and bioinformatic analyses, which worked well in a research setting. Specificity was 99.96%, and a sensitivity of ~95% was attained with hybrid capture at a sequence depth of 2.5 Gb per sample. Because enrichment failures with hybrid capture were reproducible, they may subsist amenable to rescue by individual PCR or probe redesign. Alternatively, microdroplet PCR should theoretically achieve a sensitivity of ~99%, albeit at higher cost (16, 47). The test was scalable, modular, and amenable to automation, with batches of 192 samples and a turnaround of 2 weeks. The time to first result could subsist reduced substantially with microdroplet PCR and third-generation sequencing. At tall volume, the overall analytical cost of the hybrid enrichment-based test was $378, achieving the requirement of $1 per test per condition and approximating that expended on treatment of severe recessive childhood disorders per U.S. live birth (14, 29). Although the analytical cost will reduce as the throughput of NGS improves, test interpretation, reporting, genetic counseling, and stewardship of mutation databases will deal considerable additional costs.
Having established technical feasibility in a research setting, the next phases of carrier test evolution will subsist refinement of the list of diseases, automation, software implementation, report development, and, most important, validation in a realistic testing situation featuring investigator blinding and less manual review. For example, genes associated with severe cognitive developmental disorders may merit inclusion. Although technical standards and guidelines suffer been established for laboratory-developed genetic testing for rare disorders in accredited laboratories (26), there are several challenges in their adoption for NGS and bioinformatic-based testing of ~500 conditions. For example, specific national standards for quality assurance, quality control, test accessioning and reporting, and proficiency evaluation finish not currently exist. Addressing crucial issues such as specificity and counterfeit positives is intricate when hundreds of genes are being sequenced simultaneously. For sure diseases, such as cystic fibrosis, reference sample panels and metrics suffer been established. For diseases without such materials, it is prudent to test as many samples containing known mutations as possible. In setting up and validating the screen, it would moreover subsist necessary to test examples of sum classes of mutations and situations that are anticipated to subsist potentially problematic, such as mutations within tall GC content regions, simple sequence repeats, and repetitive elements.
The ethical, legal, and sociable implications of comprehensive carrier testing warrant much discussion. These issues, in turn, are influenced by the scope and setting in which testing is proposed. The example age for recessive disease screening is in early adulthood and before pregnancy (48, 49). One possibility would subsist willing community-based population testing. This would suffer an edge over testing in a hospital setting, where information about carrier testing often is communicated during pregnancy or after the birth of an affected child (50). Community-based carrier testing has had tall uptake, without sever stigma or discrimination and with substantial reductions in the frequencies of tested disorders (3, 48, 49, 51–54). After stakeholder discussions, the cost-effectiveness and clinical utility of offering community-based carrier testing would require minute assessment. Examination of the results of existing population-based carrier screening programs for TSD and cystic fibrosis could provide templates for such analyses.
Rapid adoption of comprehensive carrier testing is likely by in vitro fertilization clinics, where screening of sperm and oocyte donors has tall clinical utility, lower counseling burden, and little incremental cost (55). Early adoption is moreover likely in medical genetics clinics, where counseling resources already exist, to screen individuals with a family history of inherited disease. Although the data reported herein are preliminary, the sever random distribution of mutations in individuals argues against screening different populations for different diseases. The most significant hurdles to implementing comprehensive carrier screening will subsist facile interpretation of results, reporting in a manner comprehensible by physicians and patients, education of the public of the benefits and limitations of screening, and provision of genetic counselors.
Currently, a two-stage approach is used for preconception carrier screening of couples, with confirmatory testing of sum positive results. However, this has been in a setting of testing individual genes for specific mutations where positive results are rare. The requirement for at least 10 high-quality reads to substantiate a variant summon resulted in a specificity of 99.96% for single-nucleotide substitutions (which is the restrict of accuracy for the gold standard method used) and 100% for about 200 known mutations and novel indels in their screening method. It appeared, therefore, that confirmatory testing of sum single-nucleotide substitutions and indels was unnecessary. Obviously, inclusion of controls in each test Run and random sample retesting will subsist required. tang with polynucleotide indels, copy number variants, monstrous insertions and deletions, and intricate rearrangements is as yet insufficient to draw hard conclusions. However, detection of faultless alignments to mutant reference sequences appeared to subsist robust for identification of monstrous insertions and deletions. They noted, however, that identification of larger polynucleotide indels was influenced in some sequences by the particular alignment seed, suggesting that additional refinement of alignment parameters is needed.
We establish an unexpectedly tall harmony of literature-annotated disease mutations that were incorrect, incomplete, or common polymorphisms. Differentiation of common polymorphisms from disease mutations requires genotyping a great number of unaffected individuals. Severe, orphan disease mutations should subsist uncommon (<1% incidence) and should not subsist establish in the homozygous condition in unaffected individuals. Unexpectedly, they establish that 74% of “disease mutation” calls were accounted for by substitutions with incidences of ≥5%, of which almost one-half were homozygous in samples unaffected by the corresponding disease. moreover unexpected was the finding that 14 of 113 literature-annotated disease mutations were incorrect. Thus, for many recessive diseases, HGMD, dbSNP, OMIM, and the literature are insufficient arbiters of whether variants are disease mutations. They suffer shown NGS of samples from affected individuals to subsist a powerful method for error correction: More than three-quarters of errors in mutation identification were Sanger sequencing interpretation errors or incorrect imputation of genomic mutations from cDNA sequencing. Key advantages of NGS are clonal derivation (facilitating unambiguous detection of heterozygous and indel variants), maintenance of facet information (allowing haplotype derivation for adjacent variants), and highly redundant coverage (resulting in extremely low consensus error rates). Thus, although they suffer shown that it is technically feasible to undertake comprehensive analysis of recessive gene sequences, sequencing of many unaffected and affected samples will subsist required to establish an authoritative disease mutation database. Specifically, current reference resources contain common polymorphisms that are annotated as disease mutations and erroneous disease mutations. Without reference database improvements, the clinical utility of comprehensive carrier testing will subsist limited. Aside from nonsense mutations and premature quit codons in known disease genes and the study of affected individuals, additional bioinformatic approaches will subsist needed to distinguish rare benign variants from pathogenic variants: Amino acid substitution characteristics such as physicochemical and evolutionary conservation and location (where tertiary structure is known) are useful but not definitive. For many rare variants, functional assays will requisite to subsist developed to assess pathogenicity rigorously. Establishment of an authoritative database of disease mutations is clearly needed and represents a nascent bottleneck in progress toward prevention, diagnosis, and treatment of recessive diseases. In the interim, clinical interpretation of the functional consequence or pathogenicity of variants will subsist challenging for many recessive diseases.
A first estimate of the medium carrier affliction of disease mutations (substitutions, indels, and monstrous deletions) causing severe childhood recessive diseases was determined: In 104 unrelated individuals, it was 2.8 per genome. Several qualifications of this affliction estimate should subsist noted. First, as discussed, an adequate compilation of pathogenic mutations does not currently exist, and strong evidence of pathogenicity was absent for some of the variants referred to as disease mutations. Second, the affliction estimate excluded new, rare, missense variants of unknown significance (VUSs), some of which are likely to subsist pathogenic. The affliction of nonconservative, nonsynonymous, uncommon (<5% incidence) VUS was ~11 per sample. Additional strategies are needed to triage these variants. Third, many individuals in their cohort were affected by one of these diseases. Although a correction was made for compound heterozygote and homozygote alleles, the affliction estimate did not correct for other potential selection biases. Fourth, they did not assess monstrous deletions or other copy number variants beyond limited CNV array hybridization and examination of coverage changes in a little number of known deletions. Nevertheless, a affliction of 2.8 per genome agreed with hypothetical estimates of reproductive lethal allele affliction (56). It moreover concurred with severe childhood recessive carrier burdens that they obtained by analyzing published individual genomes [2 substitution disease mutations in the Quake genome and a monozygotic twin pair (21, 57), 5 each in the YH and Watson genomes (58, 59), 4 in the NA07022 genome (60, 61), and 10 in the AK1 genome (20)]. The purview in carrier affliction was surprisingly narrow (zero to seven per genome). Given the great variations in SNP affliction and incidence of individual disease alleles among populations, it will subsist of powerful interest to evaluate variation in the affliction of severe recessive disease mutations among human populations and how this has been influenced by population bottlenecks.
Finally, the technology platform described herein is agnostic with admiration to target genes or clinical setting. A variety of medical applications for this technology exist beyond spend in preconception carrier screening. For example, comprehensive newborn screening for treatable or preventable Mendelian diseases would allow early diagnosis and institution of treatment while neonates are asymptomatic. Early treatment can suffer a profound repercussion on the clinical severity of conditions and could provide a framework for centralized assessment of investigational novel treatments before organ failure. In some cases, such as Duarte variant galactosemia, molecular testing would subsist superior to conventional biochemical testing. Organ or symptom menu-based diagnostic testing, with masking of nonselected conditions, is anticipated to assist clinical geneticists and pediatric neurologists, because current exercise often involves costly, sequential testing of numerous candidate genes. Given impending identification of novel disease genes by exome and genome resequencing, the number of disease genes is likely to augment substantially over the next several years, requiring incremental expansion of the target gene sets.
In summary, a technology platform for comprehensive preconception carrier screening for 448 recessive childhood diseases is described. Combining this technology with genetic counseling could reduce the incidence of severe recessive pediatric diseases and may succor to expedite diagnosis of these disorders in newborns.Materials and Methods Disease selection
Criteria for disease inclusion for preconception screening were broadly based on those for expansion of newborn screening, but with omission of treatment criteria (14). Thus, very broad coverage of severe childhood diseases and mutations was sought to maximize cost-benefit, potential reduction in disease incidence, and adoption. A Perl parser identified severe childhood recessive disorders with known molecular basis in OMIM (8). Database and literature searches and expert reviews were performed on resultant diseases (8, 27, 28). Six diseases with extreme locus heterogeneity were omitted (OMIM #209900, #209950, Fanconi anemia, #256000, #266510, #214100). Diseases were included if mutations caused severe illness in a harmony of affected children and despite variable inheritance, mitochondrial mutations, or low incidence. Mental retardation and mitochondrial genes were excluded. Four hundred and thirty-seven genes, representing 507 recessive diseases, met these criteria, of which 448 diseases were severe (table S3).DNA samples
Target enrichment was performed with 104 DNA samples obtained from the Coriell Institute (Camden, NJ) (table S7). Seventy-six of these were known to subsist carriers or affected by 37 severe, childhood recessive disorders. The latter samples contained 120 known disease mutations in 34 genes (63 substitutions, 20 indels, 13 monstrous deletions, 19 splicing, 2 regulatory, and 3 intricate disease mutations). They moreover represented homozygous, heterozygous, compound heterozygous, and hemizygous disease mutation states. Twenty-six samples were well characterized, from “normal” individuals, and two had previously undergone genome sequencing (21).Target enrichment and SBS
For Illumina GAIIx SBS, 3 μg of DNA was sonicated by Covaris S2 to ~250 nt with 20% duty cycle, 5 intensity, and 200 cycles per burst for 180 s. For Illumina HiSeq SBS, shearing to ~150 nt was by 10% duty cycle, 5 intensity, and 200 cycles per burst for 660 s. Bar-coded sequencing libraries were made per the manufacturer’s protocols. After adaptor ligation, Illumina libraries were prepared with AMPure bead (Beckman Coulter) rather than with gel purification. Library quality was assessed by optical density and electrophoresis (Agilent 2100).
SureSelect enrichment of 6-, 8-, or 12-plex pooled libraries was per Agilent protocols (15), with 100 ng of custom bait library, blocking oligonucleotides specific for paired-end sequencing libraries and 60-hour hybridization. Biotinylated RNA library hybrids were recovered with streptavidin beads. Enrichment was assessed by quantitative PCR (Life Technologies; CLN3, exon 15, Hs00041388_cn; HPRT1, exon 9, Hs02699975_cn; LYST, exon 5, Hs02929596_cn; PLP1, exon 4, Hs01638246_cn) and a nontargeted locus (chrX: 77082157, Hs05637993_cn) before and after enrichment.
RainDance RDT1000 target enrichment was as described and used a custom primer library (16, 46): Genomic DNA samples were fragmented by nebulization to 2 to 4 kb and 1 μg mixed with sum PCR reagents but primers. Microdroplets containing three primer pairs were fused with PCR reagent droplets and amplified. After emulsion breaking and purification by MinElute column (Qiagen), amplicons were concatenated overnight at 16°C and sequencing libraries were prepared. Sequencing was performed on Illumina GAIIx and HiSeq2000 instruments per the manufacturer’s protocols, as described (20, 21).Hybrid capture and SBL
DNA (3 μg) was sheared by Covaris to ~150 nt with 10% duty cycle, 5 intensity, and 100 cycles per burst for 60 s. Bar-coded fragment sequencing libraries were made with Life Technologies protocols and reagents. Taqman quantitative PCR was used to assess each library, and an equimolar six-plex pool was produced for enrichment with Agilent SureSelect and a modified protocol. Before enrichment, the six-plex pool was single-stranded. Furthermore, 1.2 μg of pooled DNA with 5 μl (100 ng) of custom baits was used for enrichment, with blocking oligonucleotides specific for SOLiD sequencing libraries and 24-hour hybridization. This was the first targeted capture of a multiplex library for SOLiD sequencing, and this protocol has not been subsequently pursued. Alternative methods suffer been demonstrated to reduce the hullabaloo associated with bar coding and enrichment. Sequencing was performed on a SOLiD 3 instrument with one quadrant on a sole sequencing slide, generating singleton 50-mer reads.Sequence analysis
The bioinformatic decision tree for detecting and genotyping disease mutations was predicated on tang with detection and genotyping of variants in next-generation genome and chromosome sequences (20, 21, 33, 34) (Fig. 4). Briefly, SBS sequences were aligned to the National hub for Biotechnology Information (NCBI) reference human genome sequence (version 36.3) with GSNAP and scored by rewarding identities (+1) and penalizing mismatches (−1) and indels [−1−log(indel − length)]. Alignments were retained if covering >95% of the read and scoring >78% of maximum. Variants were detected with Alpheus with stringent filters (>14% and >10 reads calling variants and medium quality score >20). Allele frequencies of 14 to 86% were designated heterozygous and >86% homozygous. Reference genotypes of SNPs and CNVs mapping within targets were obtained with Illumina Omni1-Quad arrays and GenomeStudio 2010.1. Indel genotypes were confirmed by genomic PCR of <600-bp flanking variants and Sanger sequencing.
SBL sequence data analysis was performed with BioScope v1.2. Fifty nucleotide reads were aligned to NCBI genome build 36.3 with a seed and extend approach (max-mapping). A 25-nt seed with up to two mismatches is first aligned to the reference. Extension can proceed in both directions, depending on the footprint of the seed within the read. During extension, each foundation match receives a score of +1, whereas mismatches win a default score of −2. The alignment with the highest mapping quality value is chosen as the primary alignment. If two or more alignments suffer the same score, then one of them is randomly chosen as the primary alignment. SNPs were called with the BioScope diBayes algorithm at medium stringency setting (61). diBayes is a Bayesian algorithm that incorporates position and probe errors, as well as color quality value information for SNP calling. Reads with mapping quality of <8 were discarded by diBayes. A position must suffer at least 2× or 3× coverage to summon a homozygous or heterozygous SNP, respectively. The BioScope little indel pipeline was used with default settings and calls insertions of size ≤3 nt and deletions of size ≤11 nt. In comparisons with SBS, SNP and indel calls were further restricted to positions where at least 4 or 10 reads called a variant.Indel confirmation
PCR primers were designed to amplify 100 to 300 nt upstream and downstream of each variant or indel with PrimerQuest (Integrated DNA Technologies). Targeted regions were amplified from 100 ng of genomic DNA, and resultant PCR amplicons were analyzed for predicted size by LCGX (Caliper Life Sciences). Amplicons of appropriate size were Sanger-sequenced in both the forward and the invert directions with the same primers used for PCR amplification. Analysis was performed with the Mutation Surveyor (SoftGenetics) software package.Supplementary Material
Fig. S1. One quit of five reads from NA01712 showing ERCC6 exon 17, c.3536delA, Y1179fs, chr10:50348476delA.
Fig. S2. One quit of five reads from NA20383 showing CLN3 exon 11, c.1020G>T, E295X, chr16:28401322G>T (black arrow).
Fig. S3. One quit of five reads from NA16643 showing HBB exon 2, c.306G>C, E102D, chr11:5204392G>C (black arrow).
Table S1. Four hundred and forty-eight severe pediatric recessive diseases, encompassing 437 genes, that met criteria for carrier screening.
Table S2. Sequences and genome coordinates of 29,891 Agilent SureSelect 120-mer RNA baits for hybrid capture of 7616 (99.7%) of 7717 segments of 437 genes causing severe recessive pediatric disorders.
Table S3. Custom Agilent SureSelect RNA baits for hybrid capture of 11 monstrous deletion DMs with defined boundaries.
Table S4. repeat content of 55 exons (5773 nt, 46.27%) failing RNA bait design due to repetitive sequences.
Table S5. Sequences and genome coordinates of 10,280 primer pairs for microdroplet PCR (RainDance) of 7717 segments of 437 genes causing severe recessive pediatric disorders.
Table S6. Coordinates, genes, and GC content of 40 exons with recurrent coverage <3×.
Table S7. Confirmed and corrected disease mutations (DMs) in 104 DNA samples, together with enrichment technologies and sequencing platforms used to characterize them.
Table S8. Variants reported in HGMD to subsist disease mutations that occurred with incidence >5% in 104 samples by target enrichment and second-generation sequencing or that were assessed to subsist homozygous in unaffected samples, indicative that they were polymorphisms.
Table S9. severe recessive pediatric disease-causing mutations (DMs) identified in 104 samples by target enrichment and second-generation sequencing.
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