ArticleJournal of human genetics2026
Activation of cryptic donor splice site due to an exonic MYPN variant in congenital myopathy.
Article in Journal of human genetics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Biallelic pathogenic variants in the MYPN gene are a known cause of congenital myopathy, and exonic variants that activate cryptic splice sites have not been previously reported. Here, we report a Chinese proband with congenital myopathy carrying a homozygous nonsense variant, c.2986C>T (p.Arg996Ter), in exon 14 of the MYPN gene. Transcriptional analysis suggested that this variant likely activated a cryptic donor splice site, truncating the last 91 nucleotides of exon 14 during pre-mRNA splicing. Western blotting and immunofluorescence confirmed a deficiency of myopalladin protein in the proband's skeletal muscle. Our study highlights that exonic variants, particularly those distant from exon-intron junctions, can induce aberrant pre-mRNA splicing. This insight is crucial for interpreting the pathogenicity of variants of uncertain significance and enhancing diagnostic yield in genetic testing.
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