Analysis by minigene assay of the splicing effect of a novel variant c.1545T>G in the SLC26A4 gene associated with hearing loss
- Authors: Panina E.A.1,2, Danilchenko V.Y.1,2, Zytsar M.V.1,2, Orishchenko K.E.1,2, Posukh O.L.1,2
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Affiliations:
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences
- Novosibirsk State University
- Issue: Vol 61, No 5 (2025)
- Pages: 103-109
- Section: КРАТКИЕ СООБЩЕНИЯ
- URL: https://ogarev-online.ru/0016-6758/article/view/296533
- DOI: https://doi.org/10.31857/S0016675825050101
- EDN: https://elibrary.ru/tlkljo
- ID: 296533
Cite item
Abstract
Pathogenic variants in the SLC26A4 gene (OMIM #605646, 21 exons), encoding the transmembrane protein pendrin, are one of the most significant genetic causes of hearing loss. It is known that about 25% of all pathogenic SLC26A4 variants, which are localized in both intronic and exonic gene regions (near the exon–intron boundaries), lead to aberrant splicing. A detailed analysis of the SLC26A4 gene in Tuvinian patients with hearing loss (the Tyva Republic, Southern Siberia) revealed a specific spectrum of variations, including both already known pathogenic variants and novel variants with unclear clinical significance. One of the novel variants, c.1545T>G, is localized at a position that is potentially «sensitive» to splicing (the 1st nucleotide in exon 14). The segregation of this variant with hearing loss observed in the pedigrees of patients and the significant increase in the frequency of c.1545T>G in the sample of patients compared to the control sample indicate its pathogenic significance. The aim of this work is to analyze the effect of novel variant c.1545T>G of the SLC26A4 gene on the splicing process using minigene assay. A system of minigenes was created, including the analyzed variant c.1545T>G, and the wild-type variant. The study was carried out on HEK293T cell line and repeated on HeLa and SW480 cells. Comparative analysis of splicing patterns in minigenes with variant c.1545T>G and with wild type did not reveal any differences. Thus, variant c.1545T>G of the SLC26A4 gene does not lead to splicing disruption, and its pathogenic effect may be due to the substitution of phenylalanine (Phe) for leucine (Leu) at amino acid position 515 (p.Phe515Leu) of the pendrin protein.
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About the authors
E. A. Panina
Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Email: posukh@bionet.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
V. Y. Danilchenko
Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Email: posukh@bionet.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
M. V. Zytsar
Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Email: posukh@bionet.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
K. E. Orishchenko
Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Email: posukh@bionet.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
O. L. Posukh
Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Author for correspondence.
Email: posukh@bionet.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
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