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Integrated Model of De Novo and Inherited Genetic Variants Yields Greater Power to Identify Risk Genes

Author

Listed:
  • Xin He
  • Stephan J Sanders
  • Li Liu
  • Silvia De Rubeis
  • Elaine T Lim
  • James S Sutcliffe
  • Gerard D Schellenberg
  • Richard A Gibbs
  • Mark J Daly
  • Joseph D Buxbaum
  • Matthew W State
  • Bernie Devlin
  • Kathryn Roeder

Abstract

De novo mutations affect risk for many diseases and disorders, especially those with early-onset. An example is autism spectrum disorders (ASD). Four recent whole-exome sequencing (WES) studies of ASD families revealed a handful of novel risk genes, based on independent de novo loss-of-function (LoF) mutations falling in the same gene, and found that de novo LoF mutations occurred at a twofold higher rate than expected by chance. However successful these studies were, they used only a small fraction of the data, excluding other types of de novo mutations and inherited rare variants. Moreover, such analyses cannot readily incorporate data from case-control studies. An important research challenge in gene discovery, therefore, is to develop statistical methods that accommodate a broader class of rare variation. We develop methods that can incorporate WES data regarding de novo mutations, inherited variants present, and variants identified within cases and controls. TADA, for Transmission And De novo Association, integrates these data by a gene-based likelihood model involving parameters for allele frequencies and gene-specific penetrances. Inference is based on a Hierarchical Bayes strategy that borrows information across all genes to infer parameters that would be difficult to estimate for individual genes. In addition to theoretical development we validated TADA using realistic simulations mimicking rare, large-effect mutations affecting risk for ASD and show it has dramatically better power than other common methods of analysis. Thus TADA's integration of various kinds of WES data can be a highly effective means of identifying novel risk genes. Indeed, application of TADA to WES data from subjects with ASD and their families, as well as from a study of ASD subjects and controls, revealed several novel and promising ASD candidate genes with strong statistical support.Author Summary: The genetic underpinnings of autism spectrum disorder (ASD) have proven difficult to determine, despite a wealth of evidence for genetic causes and ongoing effort to identify genes. Recently investigators sequenced the coding regions of the genomes from ASD children along with their unaffected parents (ASD trios) and identified numerous new candidate genes by pinpointing spontaneously occurring (de novo) mutations in the affected offspring. A gene with a severe (de novo) mutation observed in more than one individual is immediately implicated in ASD; however, the majority of severe mutations are observed only once per gene. These genes create a short list of candidates, and our results suggest about 50% are true risk genes. To strengthen our inferences, we develop a novel statistical method (TADA) that utilizes inherited variation transmitted to affected offspring in conjunction with (de novo) mutations to identify risk genes. Through simulations we show that TADA dramatically increases power. We apply this approach to nearly 1000 ASD trios and 2000 subjects from a case-control study and identify several promising genes. Through simulations and application we show that TADA's integration of sequencing data can be a highly effective means of identifying risk genes.

Suggested Citation

  • Xin He & Stephan J Sanders & Li Liu & Silvia De Rubeis & Elaine T Lim & James S Sutcliffe & Gerard D Schellenberg & Richard A Gibbs & Mark J Daly & Joseph D Buxbaum & Matthew W State & Bernie Devlin &, 2013. "Integrated Model of De Novo and Inherited Genetic Variants Yields Greater Power to Identify Risk Genes," PLOS Genetics, Public Library of Science, vol. 9(8), pages 1-12, August.
  • Handle: RePEc:plo:pgen00:1003671
    DOI: 10.1371/journal.pgen.1003671
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    References listed on IDEAS

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    1. Brian J. O’Roak & Laura Vives & Santhosh Girirajan & Emre Karakoc & Niklas Krumm & Bradley P. Coe & Roie Levy & Arthur Ko & Choli Lee & Joshua D. Smith & Emily H. Turner & Ian B. Stanaway & Benjamin V, 2012. "Sporadic autism exomes reveal a highly interconnected protein network of de novo mutations," Nature, Nature, vol. 485(7397), pages 246-250, May.
    2. Stephan J. Sanders & Michael T. Murtha & Abha R. Gupta & John D. Murdoch & Melanie J. Raubeson & A. Jeremy Willsey & A. Gulhan Ercan-Sencicek & Nicholas M. DiLullo & Neelroop N. Parikshak & Jason L. S, 2012. "De novo mutations revealed by whole-exome sequencing are strongly associated with autism," Nature, Nature, vol. 485(7397), pages 237-241, May.
    3. Benjamin M. Neale & Yan Kou & Li Liu & Avi Ma’ayan & Kaitlin E. Samocha & Aniko Sabo & Chiao-Feng Lin & Christine Stevens & Li-San Wang & Vladimir Makarov & Paz Polak & Seungtai Yoon & Jared Maguire &, 2012. "Patterns and rates of exonic de novo mutations in autism spectrum disorders," Nature, Nature, vol. 485(7397), pages 242-245, May.
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    1. Emily Olfson & Luis C. Farhat & Wenzhong Liu & Lawrence A. Vitulano & Gwyneth Zai & Monicke O. Lima & Justin Parent & Guilherme V. Polanczyk & Carolina Cappi & James L. Kennedy & Thomas V. Fernandez, 2024. "Rare de novo damaging DNA variants are enriched in attention-deficit/hyperactivity disorder and implicate risk genes," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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