The DLX1and DLX2 genes and susceptibility to autism spectrum disorders.

European Journal of Human Genetics : EJHG
Xudong LiuJeanette J A Holden

Abstract

An imbalance between excitation and inhibition in the cerebral cortex has been suggested as a possible etiology of autism. The DLX genes encode homeodomain-containing transcription factors controlling the generation of GABAergic cortical interneurons. The DLX1 and DLX2 genes lie head-to-head in 2q32, a region associated with autism susceptibility. We investigated 6 Tag SNPs within the DLX1/2 genes in two cohorts of multiplex (MPX) and one of simplex (SPX) families for association with autism. Family-based association tests showed strong association with five of the SNPs. The common alleles of rs743605 and rs4519482 were significantly associated with autism (P<0.012) in the first sample of 138 MPX families, with the latter remaining significant after correction for multiple testing (P(cor)=0.0046). Findings in a second sample of 169 MPX families not only confirmed the association at rs4519482 (P=0.034) but also showed strong allelic association of the common alleles at rs788172, rs788173 and rs813720 (P(cor)=0.0003-0.04). In the combined MPX families, the common alleles were all significantly associated with autism (P(cor)=0.0005-0.016). The GGGTG haplotype was over transmitted in the two MPX cohorts and the combined samples [P(...Continue Reading

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