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PLoS Genet. 2016 Sep 15;12(9):e1006245. doi: 10.1371/journal.pgen.1006245. eCollection 2016 Sep.

The Contribution of Mosaic Variants to Autism Spectrum Disorder.

Freed D1,2, Pevsner J1,2,3.

Author information

1
Program in Biochemistry, Cellular and Molecular Biology, Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America.
2
Department of Neurology, Kennedy Krieger Institute, Maryland, United States of America.
3
Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, Maryland, United States of America.

Abstract

De novo mutation is highly implicated in autism spectrum disorder (ASD). However, the contribution of post-zygotic mutation to ASD is poorly characterized. We performed both exome sequencing of paired samples and analysis of de novo variants from whole-exome sequencing of 2,388 families. While we find little evidence for tissue-specific mosaic mutation, multi-tissue post-zygotic mutation (i.e. mosaicism) is frequent, with detectable mosaic variation comprising 5.4% of all de novo mutations. We identify three mosaic missense and likely-gene disrupting mutations in genes previously implicated in ASD (KMT2C, NCKAP1, and MYH10) in probands but none in siblings. We find a strong ascertainment bias for mosaic mutations in probands relative to their unaffected siblings (p = 0.003). We build a model of de novo variation incorporating mosaic variants and errors in classification of mosaic status and from this model we estimate that 33% of mosaic mutations in probands contribute to 5.1% of simplex ASD diagnoses (95% credible interval 1.3% to 8.9%). Our results indicate a contributory role for multi-tissue mosaic mutation in some individuals with an ASD diagnosis.

PMID:
27632392
PMCID:
PMC5024993
DOI:
10.1371/journal.pgen.1006245
[Indexed for MEDLINE]
Free PMC Article

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