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Association analysis of CAG repeats at the KCNN3 locus in Indian patients with bipolar disorder and schizophrenia

Saleem, Quasar and Sreevidya, VS and Sudhir, J and Savithri, Vijaya J and Gowda, Y and Rao, Chandrika B and Benegal, V and Majumder, Partha P and Anand, Anuranjan and Brahmachari, Samir K and Jain, Sanjeev (2000) Association analysis of CAG repeats at the KCNN3 locus in Indian patients with bipolar disorder and schizophrenia. In: American Journal of Medical Genetics, 96 (6). pp. 744-748.

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Bipolar affective disorder and schizophrenia are severe behavioral disorders with a lifetime risk of \sim 1% in the population worldwide. There is evidence that these diseases may manifest the phenomenon of anticipation similar to that seen in diseases caused by trinucleotide repeat expansions. A recent report has implicated a potassium channel-coding gene, KCNN3, which contains a polymorphic CAG repeat in its coding region, in schizophrenia and bipolar disorder. We have tried to confirm these findings in Indian patients suffering from bipolar disorder and schizophrenia. No statistically significant evidence for the presence of an excess of longer alleles in the patient population, as compared to ethnically matched controls, was found. However, an analysis of the difference of allele sizes revealed a significantly greater number of patients with schizophrenia having differences of allele sizes \geq 5 when compared to normal controls. This finding may be of functional significance as the KCNN3 protein is thought to act as a tetramer, and a large difference in allele sizes would result in an asymmetric molecule with a different number of glutamine residues in each monomer.

Item Type: Journal Article
Publication: American Journal of Medical Genetics
Publisher: Wiley-Liss, Inc.
Additional Information: The copyright belongs to Wiley-Liss, Inc.
Keywords: bipolar disorder;cag repeats;potassium channel;schizophrenia
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 10 Jan 2006
Last Modified: 27 Aug 2008 11:40
URI: http://eprints.iisc.ac.in/id/eprint/4977

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