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01.02.2010 | Article

Common variants at the GCK, GCKR, G6PC2–ABCB11 and MTNR1B loci are associated with fasting glucose in two Asian populations

verfasst von: F. Takeuchi, T. Katsuya, S. Chakrewarthy, K. Yamamoto, A. Fujioka, M. Serizawa, T. Fujisawa, E. Nakashima, K. Ohnaka, H. Ikegami, T. Sugiyama, T. Nabika, A. Kasturiratne, S. Yamaguchi, S. Kono, R. Takayanagi, Y. Yamori, S. Kobayashi, T. Ogihara, A. de Silva, R. Wickremasinghe, N. Kato

Erschienen in: Diabetologia | Ausgabe 2/2010

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Abstract

Aims/hypothesis

To test fasting glucose association at four loci recently identified or verified by genome-wide association (GWA) studies of European populations, we performed a replication study in two Asian populations.

Methods

We genotyped five common variants previously reported in Europeans: rs1799884 (GCK), rs780094 (GCKR), rs560887 (G6PC2–ABCB11) and both rs1387153 and rs10830963 (MTNR1B) in the general Japanese (n = 4,813) and Sri Lankan (n = 2,319) populations. To identify novel variants, we further examined genetic associations near each locus by using GWA scan data on 776 non-diabetic Japanese samples.

Results

Fasting glucose association was replicated for the five single nucleotide polymorphisms (SNPs) at p < 0.05 (one-tailed test) in South Asians (Sri Lankan) as well as in East Asians (Japanese). In fine-mapping by GWA scan data, we identified in the G6PC2–ABCB11 region a novel SNP, rs3755157, with significant association in Japanese (p = 2.6 × 10^-8) and Sri Lankan (p = 0.001) populations. The strength of association was more prominent at rs3755157 than that of the original SNP rs560887, with allelic heterogeneity detected between the SNPs. On analysing the cumulative effect of associated SNPs, we found the per-allele gradients (β = 0.055 and 0.069 mmol/l in Japanese and Sri Lankans, respectively) to be almost equivalent to those reported in Europeans.

Conclusions/interpretation

Fasting glucose association at four tested loci was proven to be replicable across ethnic groups. Despite this overall consistency, ethnic diversity in the pattern and strength of linkage disequilibrium certainly exists and can help to appreciably reduce potential causal variants after GWA studies.

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Titel: Common variants at the GCK, GCKR, G6PC2–ABCB11 and MTNR1B loci are associated with fasting glucose in two Asian populations
verfasst von: F. Takeuchi
T. Katsuya
S. Chakrewarthy
K. Yamamoto
A. Fujioka
M. Serizawa
T. Fujisawa
E. Nakashima
K. Ohnaka
H. Ikegami
T. Sugiyama
T. Nabika
A. Kasturiratne
S. Yamaguchi
S. Kono
R. Takayanagi
Y. Yamori
S. Kobayashi
T. Ogihara
A. de Silva
R. Wickremasinghe
N. Kato
Publikationsdatum: 01.02.2010
Verlag: Springer-Verlag
Erschienen in: Diabetologia / Ausgabe 2/2010
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-009-1595-1

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