An analysis of exome sequencing for diagnostic testing of the genes associated with muscle disease and spastic paraplegia

Cristina Dias, Murat Sincan, Praveen F. Cherukuri, Rosemarie Rupps, Yan Huang, Hannah Briemberg, Kathryn Selby, James C. Mullikin, Thomas C. Markello, David R. Adams, William A. Gahl, Cornelius F. Boerkoel

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

In this study, we assess exome sequencing (ES) as a diagnostic alternative for genetically heterogeneous disorders. Because ES readily identified a previously reported homozygous mutation in the CAPN3 gene for an individual with an undiagnosed limb girdle muscular dystrophy, we evaluated ES as a generalizable clinical diagnostic tool by assessing the targeting efficiency and sequencing coverage of 88 genes associated with muscle disease (MD) and spastic paraplegia (SPG). We used three exome-capture kits on 125 individuals. Exons constituting each gene were defined using the UCSC and CCDS databases. The three exome-capture kits targeted 47-92% of bases within the UCSC-defined exons and 97-99% of bases within the CCDS-defined exons. An average of 61.2-99.5% and 19.1-99.5% of targeted bases per gene were sequenced to 20X coverage within the CCDS-defined MD and SPG coding exons, respectively. Greater than 95-99% of targeted known mutation positions were sequenced to ≥1X coverage and 55-87% to ≥20X coverage in every exome. We conclude, therefore, that ES is a rapid and efficient first-tier method to screen for mutations, particularly within the CCDS annotated exons, although its application requires disclosure of the extent of coverage for each targeted gene and supplementation with second-tier Sanger sequencing for full coverage.

Original languageEnglish (US)
Pages (from-to)614-626
Number of pages13
JournalHuman mutation
Volume33
Issue number4
DOIs
Publication statusPublished - Apr 1 2012

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Keywords

  • CAPN3
  • Clinical genetic testing
  • Exome
  • HSP
  • LGMD
  • Neuromuscular disorders

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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