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First estimate of the scale of canonical 5' splice site GT>GC variants capable of generating wild-type transcripts

Lin, Jin-Huan, Tang, Xin-Ying, Boulling, Arnaud, Zou, Wen-Bin, Masson, Emmanuelle, Fichou, Yann, Raud, Loann, Le Tertre, Marlène, Deng, Shun-Jiang, Berlivet, Isabelle, Ka, Chandran, Mort, Matthew, Hayden, Matthew, Leman, Raphaël, Houdayer, Claude, Le Gac, Gerald, Cooper, David N., Li, Zhao-Shen, Férec, Claude, Liao, Zhuan and Chen, Jian-Min 2019. First estimate of the scale of canonical 5' splice site GT>GC variants capable of generating wild-type transcripts. Human Mutation 40 (10) , pp. 1856-1873. 10.1002/humu.23821

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It has long been known that canonical 5' splice site (5'SS) GT>GC variants may be compatible with normal splicing. However, to date, the actual scale of canonical 5'SSs capable of generating wild‐type transcripts in the case of GT>GC substitutions remains unknown. Herein, combining data derived from a meta‐analysis of 45 human disease‐causing 5'SS GT>GC variants and a cell culture‐based full‐length gene splicing assay of 103 5'SS GT>GC substitutions, we estimate that ~15‐18% of canonical GT 5'SSs retain their capacity to generate between 1 and 84% normal transcripts when GT is substituted by GC. We further demonstrate that the canonical 5'SSs in which substitution of GT by GC generated normal transcripts exhibit stronger complementarity to the 5' end of U1 snRNA than those sites whose substitutions of GT by GC did not lead to the generation of normal transcripts. We also observed a correlation between the generation of wild‐type transcripts and a milder than expected clinical phenotype but found that none of the available splicing prediction tools were capable of reliably distinguishing 5'SS GT>GC variants that generated wild‐type transcripts from those that did not. Our findings imply that 5'SS GT>GC variants in human disease genes may not invariably be pathogenic.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Publisher: Wiley
ISSN: 1059-7794
Date of First Compliant Deposit: 12 June 2019
Date of Acceptance: 12 June 2019
Last Modified: 27 Jan 2022 15:12

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