New Susceptibility Gene For Type 2 Diabetes

Online in Nature Genetics, two groups report genome-wide association studies of Japanese individuals with type 2 diabetes. Masato Kasuga and colleagues found variants in KCNQ1 to be associated with increased risk of the disease, which they subsequently replicated in populations from Korea, China and Sweden. Shiro Maeda also identified risk variants in KCNQ1 in Japanese, and replicated the associations in affected individuals from Singapore and Denmark. KCNQ1 encodes a potassium channel subunit, and although KCNQ1 mutations have most prominently been associated with life-threatening cardiac arrhythmias, the gene has also been reported to regulate insulin secretion in the pancreas.

The risk variants have a similar effect in both East Asian and European populations, but they are much less frequent in Europeans, which may explain why they were not previously identified in the European-based large-scale studies of type 2 diabetes. As such, these results add to the growing body of evidence that the frequency of disease susceptibility variants may differ depending on ancestry, and underscore the importance of carrying out genome-wide association studies of individuals of non-European descent.

Author contacts:

Masato Kasuga (Kobe University Graduate School of Medicine, Kobe, Japan)
E-mail: kasuga@med.kobe-u.ac.jp

Shiro Maeda (Center for Genomic Medicine, RIKEN, Yokohama, Japan)
E-mail: smaeda@src.riken.jp

Abstracts available online:
Paper 1.
Paper 2.

(C) Nature Genetics press release.

Message posted by: Trevor M. D'Souza