Homozygous in-frame variant of SCL6A3 causes dopamine transporter deficiency syndrome in a consanguineous family.

Abstract:

:The human dopamine transporter (hDAT) participates in dopamine homeostasis by clearing dopamine from the extracellular space using secondary active transport. Dysregulation of hDAT has been reported to be associated with different neuropsychiatric disorders. Dopamine transporter deficiency syndrome (DTDS) is a complex disease caused by defects in dopamine uptake within the synaptic cleft and patients manifest parkinsonian features. The extracellular loops are crucial for DAT activity and defects in these regions disturb dopamine transport. In the present study, a 3.5-year-old female in a consanguineous Iranian family with an initial diagnosis of gait imbalance and speech delay has been identified. We utilized whole-exome sequencing (WES) to identify the possible genetic defect(s). WES identified a novel homozygous in-frame indel variant, c.1139_1150del; p.(Gly380_Lys384delinsGlu), in the SLC6A3 gene (NM_001044.4), as the most likely disease-susceptibility variant. This variant is located in extracellular loop 4 (EL4) of the DAT protein. Our study highlights the role of extracellular loops and shows the EL4 of hDAT as a critical region for the protein activity. The identified variant in the EL4 region of DAT is predicted to compromise DAT function and may lead to DTDS in this case. However, complementary studies are required to confirm.

journal_name

Ann Hum Genet

journal_title

Annals of human genetics

authors

Heidari E,Razmara E,Hosseinpour S,Tavasoli AR,Garshasbi M

doi

10.1111/ahg.12378

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

315-323

issue

4

eissn

0003-4800

issn

1469-1809

journal_volume

84

pub_type

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