Clinical whole-exome sequencing for the diagnosis of mendelian disorders

Yaping Yang, Donna M. Muzny, Jeffrey G. Reid, Matthew N. Bainbridge, Alecia Willis, Patricia A. Ward, Alicia Braxton, Joke Beuten, Fan Xia, Zhiyv Niu, Matthew Hardison, Richard Person, Mir Reza Bekheirnia, Magalie S. Leduc, Amelia Kirby, Peter Pham, Jennifer Scull, Min Wang, Yan Ding, Sharon E. PlonJames R. Lupski, Arthur L. Beaudet, Richard A. Gibbs, Christine M. Eng

Research output: Contribution to journalArticlepeer-review

1206 Scopus citations


BACKGROUND: Whole-exome sequencing is a diagnostic approach for the identification of molecular defects in patients with suspected genetic disorders. METHODS: We developed technical, bioinformatic, interpretive, and validation pipelines for whole-exome sequencing in a certified clinical laboratory to identify sequence variants underlying disease phenotypes in patients. RESULTS: We present data on the first 250 probands for whom referring physicians ordered whole-exome sequencing. Patients presented with a range of phenotypes suggesting potential genetic causes. Approximately 80% were children with neurologic phenotypes. Insurance coverage was similar to that for established genetic tests. We identified 86 mutated alleles that were highly likely to be causative in 62 of the 250 patients, achieving a 25% molecular diagnostic rate (95% confidence interval, 20 to 31). Among the 62 patients, 33 had autosomal dominant disease, 16 had autosomal recessive disease, and 9 had X-linked disease. A total of 4 probands received two nonoverlapping molecular diagnoses, which potentially challenged the clinical diagnosis that had been made on the basis of history and physical examination. A total of 83% of the autosomal dominant mutant alleles and 40% of the X-linked mutant alleles occurred de novo. Recurrent clinical phenotypes occurred in patients with mutations that were highly likely to be causative in the same genes and in different genes responsible for genetically heterogeneous disorders. CONCLUSIONS: Whole-exome sequencing identified the underlying genetic defect in 25% of consecutive patients referred for evaluation of a possible genetic condition.

Original languageEnglish (US)
Pages (from-to)1502-1511
Number of pages10
JournalNew England Journal of Medicine
Issue number16
StatePublished - 2013

ASJC Scopus subject areas

  • General Medicine


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