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Genome-wide significance testing of variation from single case exomes.


ABSTRACT: Standard techniques from genetic epidemiology are ill-suited to formally assess the significance of variants identified from a single case. We developed a statistical inference framework for identifying unusual functional variation from a single exome or genome, what we refer to as the 'n-of-one' problem. Using this approach we assessed our ability to identify the causal genotypes in over 5 million simulated cases of Mendelian disease, identifying 39% of disease genotypes as the most damaging unit in a typical exome background. We applied our approach to 129 n-of-one families from the Undiagnosed Diseases Program, nominating 60% of 30 disease genes determined to be diagnostic by a standard clinical workup. Our method can currently produce well-calibrated P values when applied to single genomes, can facilitate integration of multiple data types for n-of-one analyses, and, with further work, could become a widely used epidemiological method like linkage analysis or genome-wide association analysis.

SUBMITTER: Wilfert AB 

PROVIDER: S-EPMC5127779 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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Genome-wide significance testing of variation from single case exomes.

Wilfert Amy B AB   Chao Katherine R KR   Kaushal Madhurima M   Jain Sanjay S   Zöllner Sebastian S   Adams David R DR   Conrad Donald F DF  

Nature genetics 20161024 12


Standard techniques from genetic epidemiology are ill-suited to formally assess the significance of variants identified from a single case. We developed a statistical inference framework for identifying unusual functional variation from a single exome or genome, what we refer to as the 'n-of-one' problem. Using this approach we assessed our ability to identify the causal genotypes in over 5 million simulated cases of Mendelian disease, identifying 39% of disease genotypes as the most damaging un  ...[more]

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