A Novel Intronic Splicing Mutation in the EXT2 Gene of a Chinese Family with Multiple Osteochondroma.

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  • Additional Information
    • Source:
      Publisher: Mary Ann Liebert, Inc Country of Publication: United States NLM ID: 101494210 Publication Model: Print Cited Medium: Internet ISSN: 1945-0257 (Electronic) Linking ISSN: 19450257 NLM ISO Abbreviation: Genet Test Mol Biomarkers Subsets: MEDLINE
    • Publication Information:
      Original Publication: New Rochelle, NY : Mary Ann Liebert, Inc.
    • Subject Terms:
      Exostoses, Multiple Hereditary/*genetics ; N-Acetylglucosaminyltransferases/*genetics; Adult ; Alleles ; Asian People/genetics ; China ; Exons/genetics ; Exostoses, Multiple Hereditary/metabolism ; Female ; Humans ; Introns/genetics ; Male ; Mutation/genetics ; Mutation, Missense ; N-Acetylglucosaminyltransferases/metabolism ; Pedigree ; Phenotype ; RNA Splice Sites/genetics ; RNA Splicing/genetics
    • Abstract:
      Background: Multiple osteochondroma (MO), an autosomal dominant genetic disease, is caused by heterozygous mutations in the EXT1 and EXT2 genes. Approximately 80% of pathogenic mutations are nonsense/missense mutations, small indels, and splicing mutations. Splicing mutations, particularly at the 3' and 5' splice sites, disrupt normal mRNA processing and cause exon skipping or aberrant splicing, ultimately resulting in protein truncation and loss of function. Methods: Polymerase chain reaction (PCR) and Sanger sequencing were applied to detect subtle mutations in a Chinese family with MO, the pathogenicity of a splicing variant was predicted by bioinformatics and further verified using a minigene splicing assay. Results: A novel and heterozygous splicing mutation, c.626 + 2_626 + 5delTAGG, was identified in the EXT2 gene of the proband and the father by PCR and Sanger sequencing, whereas the unaffected mother and brother had wild-type alleles at the same site. Bioinformatics predicted that the 5' splicing site of exon 3 in the EXT2 gene was destroyed due to this mutation. A hybrid minigene splicing assay (HMSA) indicated that the mutation disturbed the normal splicing of the EXT2 gene mRNA and led to a deletion of 79 bp at the 5' end of exon 3, which resulted in aberrant splicing of exon 3 and introduced an earlier stop codon in the EXT2 gene. Conclusion: A novel splicing mutation was identified that produced the MO phenotype through aberrant splicing in a Chinese family. This observation, expands our knowledge of the spectrum of molecular pathogenic mechanisms leading to aberrant mRNA splicing.
    • Contributed Indexing:
      Keywords: EXT2 gene; bioinformatics; hybrid minigene splicing assay; multiple osteochondroma; splicing mutation
    • Accession Number:
      0 (RNA Splice Sites)
      EC 2.4.1.- (N-Acetylglucosaminyltransferases)
      EC 2.4.1.224 (exostosin-2)
    • Publication Date:
      Date Created: 20210719 Date Completed: 20211004 Latest Revision: 20221207
    • Publication Date:
      20240105
    • Accession Number:
      10.1089/gtmb.2021.0030
    • Accession Number:
      34280007