Networks of neuronal genes affected by common and rare variants in autism spectrum disorders

PLoS Genetics
Eyal Ben-David, Sagiv Shifman

Abstract

Autism spectrum disorders (ASD) are neurodevelopmental disorders with phenotypic and genetic heterogeneity. Recent studies have reported rare and de novo mutations in ASD, but the allelic architecture of ASD remains unclear. To assess the role of common and rare variations in ASD, we constructed a gene co-expression network based on a widespread survey of gene expression in the human brain. We identified modules associated with specific cell types and processes. By integrating known rare mutations and the results of an ASD genome-wide association study (GWAS), we identified two neuronal modules that are perturbed by both rare and common variations. These modules contain highly connected genes that are involved in synaptic and neuronal plasticity and that are expressed in areas associated with learning and memory and sensory perception. The enrichment of common risk variants was replicated in two additional samples which include both simplex and multiplex families. An analysis of the combined contribution of common variants in the neuronal modules revealed a polygenic component to the risk of ASD. The results of this study point toward contribution of minor and major perturbations in the two sub-networks of neuronal genes to ASD...Continue Reading

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Related Concepts

Brain
Functional Cerebral Localization
Autism Spectrum Disorders
Memory Training
Memory
Neural Networks (Anatomic)
Neurons
Genetic Polymorphism
Genetic Predisposition to Disease
Chromosome Pairing

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