In:
Frontiers in Genetics, Frontiers Media SA, Vol. 14 ( 2023-11-20)
Abstract:
Background: Molecular genetic testing is the most sensitive and specific method to confirm acute intermittent porphyria (AIP), a rare autosomal dominant disease, caused by Hydroxymethylbilane synthase (HMBS) gene mutation. According to the Human Gene Mutation Database (HGMD), approximately 20% of the reported HMBS gene variants affect pre-RNA splicing. Thus, the ensuing challenge is how to decipher the pathogenicity of these splicing variants. Methods: Using next-generation sequencing, we identified a novel heterozygous variant in the HMBS gene (c.160 + 5G & gt;C) from a Chinese family with AIP. And, previously, seven HMBS variants (c.33 + 5G & gt;A, c.88-16_88-4del, c.88-2A & gt;G, c.161-1G & gt;C, c.652-1G & gt;A, c.772-2A & gt;G and c.772-1G & gt;C) have been reported to be linked with AIP. Herein, we performed a valid and novel in vitro minigene assay to analyze the pathogenicity of these eight splicing variants. Results: By minigene assay in 293 T cell experiments, we demonstrated that all eight variants caused splicing defects in the pre-mRNA of the HMBS gene: c.160 + 5G & gt;C (intron3p_141bp retention), c.33 + 5G & gt;C(intron1p_91bp retention), c.88-16_88-4del and c.88-2A & gt;G (Exon3p_15bp deletion), c.161-1G & gt;C (Exon4p_18bp deletion), c.652-1G & gt;A (Exon11p_1bp deletion), c.772-2A & gt;G and c.772-1G & gt;C (intron11q_104bp retention or Exon12p_4bp deletion).Encouragingly, the c.160 + 5G & gt;C RNA sequencing from peripheral blood lymphocytes was consistent with the minigene assay result. Conclusion: We have made a pioneering attempt to apply minigene in vitro validation to the HMBS gene to evaluate the splicing effect of eight variants, including a novel splice variant (c.160 + 5G & gt;C). This study provides a molecular basis for future research on the pathogenesis and gene therapy of AIP.
Type of Medium:
Online Resource
ISSN:
1664-8021
DOI:
10.3389/fgene.2023.1291472
DOI:
10.3389/fgene.2023.1291472.s001
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2023
detail.hit.zdb_id:
2606823-0
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