De novo mutation in the dopamine transporter gene associates dopamine dysfunction with autism spectrum disorder

P. J. Hamilton, N. G. Campbell, S. Sharma, K. Erreger, F. Herborg Hansen, C. Saunders, A. N. Belovich, M. J. Daly, R. A. Gibbs, E. Boerwinkle, J. D. Buxbaum, E. H. Cook, B. Devlin, E. T. Lim, B. M. Neale, K. Roeder, A. Sabo, G. D. Schellenberg, C. Stevens, J. S. SutcliffeM. A. Sahai, E. H. Cook, U. Gether, H. S. Mchaourab, H. J.G. Matthies, J. S. Sutcliffe, A. Galli

Research output: Contribution to journalArticlepeer-review

135 Scopus citations

Abstract

De novo genetic variation is an important class of risk factors for autism spectrum disorder (ASD). Recently, whole-exome sequencing of ASD families has identified a novel de novo missense mutation in the human dopamine (DA) transporter (hDAT) gene, which results in a Thr to Met substitution at site 356 (hDAT T356M). The dopamine transporter (DAT) is a presynaptic membrane protein that regulates dopaminergic tone in the central nervous system by mediating the high-affinity reuptake of synaptically released DA, making it a crucial regulator of DA homeostasis. Here, we report the first functional, structural and behavioral characterization of an ASD-associated de novo mutation in the hDAT. We demonstrate that the hDAT T356M displays anomalous function, characterized as a persistent reverse transport of DA (substrate efflux). Importantly, in the bacterial homolog leucine transporter, substitution of A289 (the homologous site to T356) with a Met promotes an outward-facing conformation upon substrate binding. In the substrate-bound state, an outward-facing transporter conformation is required for substrate efflux. In Drosophila melanogaster, the expression of hDAT T356M in DA neurons-lacking Drosophila DAT leads to hyperlocomotion, a trait associated with DA dysfunction and ASD. Taken together, our findings demonstrate that alterations in DA homeostasis, mediated by aberrant DAT function, may confer risk for ASD and related neuropsychiatric conditions.

Original languageEnglish
Pages (from-to)1315-1323
Number of pages9
JournalMolecular Psychiatry
Volume18
Issue number12
DOIs
StatePublished - Dec 2013

Keywords

  • Drosophila melanogaster
  • anomalous dopamine efflux
  • autism spectrum disorder
  • de novo mutation
  • dopamine
  • transporter

Fingerprint

Dive into the research topics of 'De novo mutation in the dopamine transporter gene associates dopamine dysfunction with autism spectrum disorder'. Together they form a unique fingerprint.

Cite this