Format

Send to

Choose Destination
Mol Psychiatry. 2018 Feb;23(2):231-239. doi: 10.1038/mp.2016.222. Epub 2016 Dec 13.

Association of rare missense variants in the second intracellular loop of NaV1.7 sodium channels with familial autism.

Author information

1
Department of Pharmacology, University of Washington, Seattle, WA, USA.
2
Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA.
3
Department of Genome Sciences, University of Washington, Seattle, WA, USA.
4
Division of Medical Genetics, Department of Medicine, University of Washington, Seattle, WA, USA.
5
Department of Biostatistics, University of Washington, Seattle, WA, USA.

Abstract

Autism spectrum disorder (ASD) is a complex neurodevelopmental disorder often accompanied by intellectual disability, language impairment and medical co-morbidities. The heritability of autism is high and multiple genes have been implicated as causal. However, most of these genes have been identified in de novo cases. To further the understanding of familial autism, we performed whole-exome sequencing on five families in which second- and third-degree relatives were affected. By focusing on novel and protein-altering variants, we identified a small set of candidate genes. Among these, a novel private missense C1143F variant in the second intracellular loop of the voltage-gated sodium channel NaV1.7, encoded by the SCN9A gene, was identified in one family. Through electrophysiological analysis, we show that NaV1.7C1143F exhibits partial loss-of-function effects, resulting in slower recovery from inactivation and decreased excitability in cultured cortical neurons. Furthermore, for the same intracellular loop of NaV1.7, we found an excess of rare variants in a case-control variant-burden study. Functional analysis of one of these variants, M932L/V991L, also demonstrated reduced firing in cortical neurons. However, although this variant is rare in Caucasians, it is frequent in Latino population, suggesting that genetic background can alter its effects on phenotype. Although the involvement of the SCN1A and SCN2A genes encoding NaV1.1 and NaV1.2 channels in de novo ASD has previously been demonstrated, our study indicates the involvement of inherited SCN9A variants and partial loss-of-function of NaV1.7 channels in the etiology of rare familial ASD.

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center