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- Title
Mutations in the hepatocyte nuclear factor-1α gene in Chinese MODY families: prevalence and functional analysis J.Y. Xu et al.: Prevalence and function of HNF-1α mutations in MODY.
- Authors
Xu, J. Y.; Chan, V.; Zhang, W. Y.; Wat, N. M. S.; Lam, K. S. L.
- Abstract
Aims/hypothesis. Maturity-onset diabetes of the young is an autosomal dominant form of diabetes characterised by an early age of onset (usually <25 years). We investigated the prevalence and trans-activating activity of hepatocyte nuclear factor (HNF)-1α mutations in southern Chinese families with MODY. Methods. We screened for mutations in the HNF-1α gene in 50 unrelated southern Chinese families, which fulfilled the minimum criteria for MODY. Functional properties of the mutant proteins were investigated using site-directed mutagenesis and luciferase reporter assay. Results. Five of the 50 (10%) families were found to have mutations in the coding region, including a new nonsense mutation Q176X and four reported mutations (frameshift mutation P379fsdelCT, nonsense mutation R171X, missense mutations G20R and P112L). These mutations had decreased trans-activating activity on the human insulin gene promoter. We also detected a new intronic sequence variation IVS7nt–6 G→A, which co-segregated with diabetes. The intronic variation creates a potential splice acceptor site and might alter the splicing of the HNF-1α mRNA. Conclusion/interpretation. Mutations in the HNF-1α gene seem to be an important cause of MODY in southern Chinese. The mutations could affect normal islet function by altering the expression of target genes.
- Subjects
CHINA; GENETICS of diabetes; DIABETES in adolescence; DIABETES; HEPATOCYTE growth factor; LIVER cells
- Publication
Diabetologia, 2002, Vol 45, Issue 5, p744
- ISSN
0012-186X
- Publication type
Article
- DOI
10.1007/s00125-002-0814-9