Cited by 204Autism Spectrum Disorder ResearchGenetics and Neurodevelopmental DisordersGenomics and Rare Diseases

Exonic Mosaic Mutations Contribute Risk for Autism Spectrum Disorder

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Krupp, Deidre R., Barnard, Rebecca A., Duffourd, Yannis, Evans, Sara A., Mulqueen, Ryan M., Bernier, Raphael, Rivière, Jean-Baptiste, Fombonne, Eric +1 more·2017·The American Journal of Human Genetics

Published version of a preprint

Abstract

Genetic risk factors for autism spectrum disorder (ASD) have yet to be fully elucidated. Postzygotic mosaic mutations (PMMs) have been implicated in several neurodevelopmental disorders and overgrowth syndromes. By leveraging whole-exome sequencing data on a large family-based ASD cohort, the Simons Simplex Collection, we systematically evaluated the potential role of PMMs in autism risk. Initial re-evaluation of published single-nucleotide variant (SNV) de novo mutations showed evidence consistent with putative PMMs for 11% of mutations. We developed a robust and sensitive SNV PMM calling approach integrating complementary callers, logistic regression modeling, and additional heuristics. In our high-confidence call set, we identified 470 PMMs in children, increasing the proportion of mosaic SNVs to 22%. Probands have a significant burden of synonymous PMMs and these mutations are enriched for computationally predicted impacts on splicing. Evidence of increased missense PMM burden was not seen in the full cohort. However, missense burden signal increased in subcohorts of families where probands lacked nonsynonymous germline mutations, especially in genes intolerant to mutations. Parental mosaic mutations that were transmitted account for 6.8% of the presumed de novo mutations in the children. PMMs were identified in previously implicated high-confidence neurodevelopmental disorder risk genes, such as CHD2, CTNNB1, SCN2A, and SYNGAP1, as well as candidate risk genes with predicted functions in chromatin remodeling or neurodevelopment, including ACTL6B, BAZ2B, COL5A3, SSRP1, and UNC79. We estimate that PMMs potentially contribute risk to 3%-4% of simplex ASD case subjects and future studies of PMMs in ASD and related disorders are warranted.

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Crossref · 10.1016/j.ajhg.2017.07.016

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  • Next-generation sequencing identified one intronic, two missense, and two nonsense variants in NCKAP1L in autism patients.

    “Next-generation sequencing identified one intronic114, two missense133,134, and two nonsense variants in autism patients104,114, and the functional consequences of these variants remain to be established (Table 2u).”
  • Mosaic mutation characteristics are similar to the Simons Simplex Collection despite different DNA sources, capture reagents, and sequencing instruments.

    “Comparing these data to a similar mosaic set from the Simons Simplex Collection (SSC),23 we found similar mosaic mutation characteristics, despite the fact that different DNA sources, capture reagents, and sequencing instruments were used”

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Authors
Krupp, D. R., Barnard, R. A., Duffourd, Y., Evans, S. A., Mulqueen, R. M., Bernier, R., Rivière, J.-B., Fombonne, E., & O’Roak, B. J.
Affiliations
  • Oregon Health & Science University (US)
  • Université de Bourgogne (FR)
  • University of Washington (US)
  • McGill University (CA)
Corresponding author
O’Roak, Brian J.
Venue
The American Journal of Human Genetics
Publisher
Elsevier BV
Published
2017-09
Volume
101
Issue
3
Pages
369-390
ISSN
0002-9297 (ISSN-L)
OpenAlex
W2949076809
Cited by
204
References
74
Citations by year
2026: 16 · 2025: 17 · 2024: 22 · 2023: 22 · 2022: 21 · 2021: 20 · 2020: 27 · 2019: 24 · 2018: 28 · 2017: 3 · 2016: 1 · 2014: 1
FWCI
12.87
Type
journal article
Language
en
Open access
Locations
  • The American Journal of Human Genetics (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
  • Simons Foundation (SFARI 305927)
  • Agence Nationale de la Recherche (ANR-13-PDOC-0029)
  • Klingenstein-Simons Fellow in Neurosciences
  • Alfred P. Sloan Foundation Fellow in Neuroscience (FG-2015-65608)
  • NARSAD Young Investigator Award (22935) from the Brain and Behavior Research Foundation
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
Keywords
autism spectrum disorder, de novo mutations, single nucleotide variants, Simons Simplex Collection, synonymous mutations, splicing, neurodevelopmental disorders, genetic risk factors, CHD2, CTNNB1, SCN2A, SYNGAP1, chromatin remodeling genes
MeSH terms
Autism Spectrum Disorder, Child, Exons, Female, Humans, Male, Mosaicism, Mutation, Genetic Variation, Zygote, Cohort Studies, Genetic Predisposition to Disease, Databases, Genetic

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