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Related Experiment Video

Updated: Jan 6, 2026

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila

Published on: August 20, 2019

Resolving SLC6A1 variable expressivity with deep clinical phenotyping and Drosophila models.

Kristy L Jay¹, Nikhita Gogate², Paige I Hall¹

¹Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA.

|November 1, 2025

Summary

Variants in SLC6A1 cause a neurodevelopmental disorder (SLC6A1-NDD). This study identifies a new variant (p.A334S) as hypomorphic, helping explain the disorder's variable symptoms and informing future treatments.

Keywords:

Drosophila melanogaster model GABA SLC6A1 deep clinical phenotyping functional characterization neurodevelopmental disorder variable expressivity

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Last Updated: Jan 6, 2026

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Quantitative Analysis of Climbing Defects in a Drosophila Model of Neurodegenerative Disorders

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Published on: June 13, 2015

Area of Science:

Genetics
Neuroscience
Molecular Biology

Background:

Variants in SLC6A1 gene are linked to a rare neurodevelopmental disorder (SLC6A1-NDD) with diverse symptoms like developmental delay, epilepsy, and autism spectrum disorder.
While SLC6A1 haploinsufficiency is the primary cause, the molecular basis for the variable clinical presentation remains poorly understood.

Purpose of the Study:

To investigate the functional significance of an inherited p.A334S variant in SLC6A1 of uncertain significance.
To elucidate the molecular mechanisms underlying the variable expressivity in SLC6A1-NDD.
To provide insights for clinical diagnosis, prognosis, and therapeutic design for SLC6A1-NDD.

Main Methods:

Clinical phenotyping of a proband with an inherited p.A334S variant and comparison with a cohort of 13 individuals with SLC6A1-NDD.
Functional characterization of SLC6A1 variants using an allelic series in Drosophila melanogaster.
Bioinformatic clustering of clinical findings.

Main Results:

The p.A334S variant shows significant clinical overlap with confirmed SLC6A1-NDD cases.
Drosophila models expressing SLC6A1 variants exhibit phenotypes consistent with a partial loss-of-function mechanism.
The p.A334S variant is identified as a hypomorphic allele, contributing to the understanding of SLC6A1-NDD variability.

Conclusions:

The p.A334S variant is a hypomorphic allele that contributes to the variable clinical presentation of SLC6A1-NDD.
This study advances the understanding of the molecular mechanisms underlying SLC6A1-NDD.
Findings will aid in clinical diagnosis, prognosis, intervention strategies, and therapeutic development for SLC6A1-NDD.