In:
Molecular Genetics & Genomic Medicine, Wiley, Vol. 8, No. 8 ( 2020-08)
Abstract:
X‐linked Alport syndrome (XLAS) is a progressive, hereditary glomerular nephritis of variable severity caused by pathogenic COL4A5 variants. Currently, genetic testing is widely used for diagnosing XLAS; however, determining the pathogenicity of variants detected by such analyses can be difficult. Intronic variants or synonymous variants may cause inherited diseases by inducing aberrant splicing. Transcript analysis is necessary to confirm the pathogenicity of such variants, but it is sometimes difficult to extract mRNA directly from patient specimens. Methods In this study, we conducted in vitro splicing analysis using a hybrid minigene assay and specimens from three XLAS patients with synonymous variants causing aberrant splicing, including previously reported pathogenic mutations in the same codon. The variants were c.876 A 〉 T (p.Gly292=), c.2358 A 〉 G (p.Pro786=), and c.3906 A 〉 G (p.Gln1302=). Results The results from our hybrid minigene assay were sufficient to predict splicing abnormalities; c.876 A 〉 T cause 17‐bp del and 35‐bp del, c.2358 A 〉 G cause exon 29 skipping, c.3906 A 〉 G cause exon 42 skipping, which are very likely to cause pathogenicity. Further, patients carrying c.2358 A 〉 G exhibited a mild phenotype that may have been associated with the presence of both normal and abnormally spliced transcripts. Conclusion The minigene system was shown to be a sensitive assay and a useful tool for investigating the pathogenicity of synonymous variants.
Type of Medium:
Online Resource
ISSN:
2324-9269
,
2324-9269
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
2734884-2
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