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Targeted sequencing and functional analysis reveal brain-size-related genes and their networks in autism spectrum disorders
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Targeted sequencing and functional analysis reveal brain-size-related genes and their networks in autism spectrum disorders
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Journal Article
Targeted sequencing and functional analysis reveal brain-size-related genes and their networks in autism spectrum disorders
2017
Overview
Autism spectrum disorder (ASD) represents a set of complex neurodevelopmental disorders with large degrees of heritability and heterogeneity. We sequenced 136 microcephaly or macrocephaly (Mic–Mac)-related genes and 158 possible ASD-risk genes in 536 Chinese ASD probands and detected 22 damaging
de novo
mutations (DNMs) in 20 genes, including
CHD8
and
SCN2A
, with recurrent events. Nine of the 20 genes were previously reported to harbor DNMs in ASD patients from other populations, while 11 of them were first identified in present study. We combined genetic variations of the 294 sequenced genes from publicly available whole-exome or whole-genome sequencing studies (4167 probands plus 1786 controls) with our Chinese population (536 cases plus 1457 controls) to optimize the power of candidate-gene prioritization. As a result, we prioritized 67 ASD-candidate genes that exhibited significantly higher probabilities of haploinsufficiency and genic intolerance, and significantly interacted and co-expressed with each another, as well as other known ASD-risk genes. Probands with DNMs or rare inherited mutations in the 67 candidate genes exhibited significantly lower intelligence quotients, supporting their strong functional impact. In addition, we prioritized 39 ASD-related Mic–Mac-risk genes, and showed their interaction and co-expression in a functional network that converged on chromatin remodeling, synapse transmission and cell cycle progression. Genes within the three functional subnetworks exhibited distinct and recognizable spatiotemporal-expression patterns in human brains and laminar-expression profiles in the developing neocortex, highlighting their important roles in brain development. Our results indicate some of Mic–Mac-risk genes are involved in ASD.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 631/378
/ Autism
/ Autism Spectrum Disorder - genetics
/ Autism Spectrum Disorder - metabolism
/ China
/ Cortex
/ DNA-Binding Proteins - genetics
/ Exome
/ Female
/ Gene Regulatory Networks - genetics
/ Genetic Predisposition to Disease - genetics
/ Genomes
/ Genotype
/ Humans
/ Identification and classification
/ Male
/ Medicine
/ Mutation
/ Neurodevelopmental disorders
/ Pervasive developmental disorders
/ Synapses
