期刊
FRONTIERS IN GENETICS
卷 13, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fgene.2022.1064762
关键词
Joubert syndrome; OFD1; novel non-sense variant; MRI; whole exome sequencing (WES); RNA-seq
A novel nonsense variant in the OFD1 gene was identified in a suspected JBS family, broadening the genetic variation spectrum of JBS10 caused by OFD1. RNA-seq and protein structure prediction revealed that this variant may lead to a change in the structure of the OFD1 protein.
Background: Joubert syndrome (JBS) is a rare neurodevelopmental disorder associated with progressive renal, liver, and retinal involvement that exhibits heterogeneity in both clinical manifestations and genetic etiology. Therefore, it is difficult to make a definite prenatal diagnosis.Methods: Whole-exome sequencing and Sanger sequencing were performed to screen the causative gene variants in a suspected JBS family. RNA-seq and protein model prediction were performed to clarify the potential pathogenic mechanism. A more comprehensive review of previously reported cases with OFD1 variants is presented and may help to establish a genotype-phenotype.Results: We identified a novel non-sense variant in the OFD1 gene, OFD1 (NM_003611.3): c.2848A > T (p.Lys950Ter). Sanger sequencing confirmed cosegregation among this family. RNA-seq confirmed that partial degradation of mutant transcripts, which was predicted to be caused by the non-sense-mediated mRNA decay (NMD) mechanism, may explain the reduction in the proportion of mutant transcripts. Protein structure prediction of the non-sense variant transcript revealed that this variant may lead to a change in the OFD1 protein structure.Conclusion: The genetic variation spectrum of JBS10 caused by OFD1 was broadened. The novel variants further deepened our insight into the molecular mechanism of the disease.
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