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Structure-function studies of HNF1A (MODY3) gene mutations in South Indian patients with monogenic diabetes

Balamurugan, K and Bjorkhaug, L and Mahajan, S and Kanthimathi, S and Njolstad, PR and Srinivasan, N and Mohan, V and Radha, V (2016) Structure-function studies of HNF1A (MODY3) gene mutations in South Indian patients with monogenic diabetes. In: CLINICAL GENETICS, 90 (6). pp. 486-495.

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Official URL: http://dx.doi.org/10.1111/cge.12757


Maturity-onset diabetes of the young (MODY) is a genetically heterogeneous monogenic form of diabetes characterized by onset of diabetes below 25years of age, autosomal dominant mode of inheritance and primary defect in insulin secretion. Mutations in the gene (HNF1A) encoding transcription factor hepatocyte nuclear factor 1A (HNF-1A) results in one of the most common forms of MODY (MODY3). HNF-1A is mainly enriched in pancreatic -cells and hepatocytes and important for organ development and normal pancreatic function. We here report on the functional interrogation of eight missense HNF1A mutations associated with MODY3 in South Indian subjects, and the contributing effect of common variant (S487N) within HNF1A. Of the eight mutations, three mutations (p.R171G, p.G245R and p.R263H), in particular, affected HNF-1A function in transfected HeLa cells by reducing both transcriptional activity and nuclear localization, possibly due to disruption of the integrity of the three dimensional structure. The common variant p.S487N contributed further to the loss-of-function of p.R271Q (p.R271Q+p.S487N double mutant), in vitro, on both activity and localization. Our data on the first functional study of HNF1A mutations in South India subjects confers that the defect of the HNF-1A mutant proteins are responsible for MODY3 diabetes in these patients.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the WILEY-BLACKWELL, 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 04 Jan 2017 04:45
Last Modified: 04 Jan 2017 04:45
URI: http://eprints.iisc.ac.in/id/eprint/55701

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