Resolution of SLC6A1 variable expressivity in a multi-generational family using deep clinical phenotyping and Drosophila models.

Autor:	Jay KL; Department 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 77030., Gogate N; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA., Ezell K; Department of Pediatrics, Division of Medical Genetics and Genomic Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA., Andrews JC; Department 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 77030., Jangam SV; Department 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 77030., Hall PI; Department 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 77030., Pan H; Department 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 77030., Pham K; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA., German R; Department 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 77030., Gomez V; Department 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 77030., Jellinek-Russo E; School of Psychology, University of Houston, Houston, TX, USA., Storch E; Department of Psychiatry, Baylor College of Medicine, Houston, TX, USA., Yamamoto S; Department 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 77030., Kanca O; Department 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 77030., Bellen HJ; Department 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 77030., Dierick H; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA., Cogan JD; Department of Pediatrics, Division of Medical Genetics and Genomic Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA., Phillips JA; Department of Pediatrics, Division of Medical Genetics and Genomic Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA., Hamid R; Department of Pediatrics, Division of Medical Genetics and Genomic Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA., Cassini T; Department of Pediatrics, Division of Medical Genetics and Genomic Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA., Rives L; Department of Pediatrics, Division of Medical Genetics and Genomic Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA., Posey JE; Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA., Wangler MF; Department 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 77030.
Jazyk:	angličtina
Zdroj:	MedRxiv : the preprint server for health sciences [medRxiv] 2024 Sep 28. Date of Electronic Publication: 2024 Sep 28.
DOI:	10.1101/2024.09.27.24314092
Abstrakt:	Purpose: Variants in SLC6A1 result in a rare neurodevelopmental disorder characterized by a variable clinical presentation of symptoms including developmental delay, epilepsy, motor dysfunction, and autism spectrum disorder. SLC6A1 haploinsufficiency has been confirmed as the predominant pathway of SLC6A1- related neurodevelopmental disorders (NDDs), however, the molecular mechanism underlying the variable clinical presentation remains unclear. Methods: Here, through work of the Undiagnosed Diseases Network, we identify an undiagnosed individual with an inherited p.(A334S) variant of uncertain significance. To resolve this case and better understand the variable expressivity with SLC6A1 , we assess the phenotypes of the proband with a cohort of cases diagnosed with SLC6A1- related NDDs. We then create an allelic series in the Drosophila melanogaster to functionally characterize case variants. Results: We identify significant clinical overlap between the unsolved case and confirmed cases of SLC6A1- related NDDs and find a mild to severe clinical presentation associated with missense variants. We confirm phenotypes in flies expressing SLC6A1 variants consistent with a partial loss-of-function mechanism. Conclusion: We conclude that the p.(A334S) variant is a hypomorphic allele and begin to elucidate the underlying variability in SLC6A1 -related NDDs. These insights will inform clinical diagnosis, prognosis, treatment and inform therapeutic design for those living with SLC6A1- related NDDs.
Databáze:	MEDLINE
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