Dominant‐negative variant in SLC1A4 causes an autosomal dominant epilepsy syndrome

Autor: Jonai Pujol‐Giménez, Ghayda Mirzaa, Elizabeth E. Blue, Giuseppe Albano, Danny E. Miller, Aimee Allworth, James T. Bennett, Peter H. Byers, Sirisak Chanprasert, Jingheng Chen, Daniel Doherty, Andrew B. Folta, Madelyn A. Gillentine, Ian Glass, Anne Hing, Martha Horike‐Pyne, Kathleen A. Leppig, Azma Parhin, Jane Ranchalis, Wendy H. Raskind, Elisabeth A. Rosenthal, Ulrike Schwarze, Sam Sheppeard, Samuel Strohbehn, Virginia P. Sybert, Andrew Timms, Mark Wener, University of Washington Center for Mendelian Genomics (UW‐CMG)a, Undiagnosed Diseases Network (UDN), Michael J. Bamshad, Fuki M. Hisama, Gail P. Jarvik, Katrina M. Dipple, Matthias A. Hediger, Andrew B. Stergachis
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Annals of Clinical and Translational Neurology, Vol 10, Iss 6, Pp 1046-1053 (2023)
Druh dokumentu: article
ISSN: 2328-9503
DOI: 10.1002/acn3.51786
Popis: Abstract SLC1A4 is a trimeric neutral amino acid transporter essential for shuttling L‐serine from astrocytes into neurons. Individuals with biallelic variants in SLC1A4 are known to have spastic tetraplegia, thin corpus callosum, and progressive microcephaly (SPATCCM) syndrome, but individuals with heterozygous variants are not thought to have disease. We identify an 8‐year‐old patient with global developmental delay, spasticity, epilepsy, and microcephaly who has a de novo heterozygous three amino acid duplication in SLC1A4 (L86_M88dup). We demonstrate that L86_M88dup causes a dominant‐negative N‐glycosylation defect of SLC1A4, which in turn reduces the plasma membrane localization of SLC1A4 and the transport rate of SLC1A4 for L‐serine.
Databáze: Directory of Open Access Journals
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