title: MTNR1B rs10830963 is associated with fasting plasma glucose, HbA1C and impaired beta-cell function in Chinese Hans from Shanghai.
abstract: BACKGROUND
  Genome-wide association studies (GWAS) in White Europeans have shown that genetic variation rs10830963 in melatonin receptor 1B gene (MTNR1B) is associated with fasting glucose and type 2 diabetes, which has also been replicated in several Asian populations. As a variant in the gene involved in the regulation of circadian rhythms, the effect of the variant on sleep status remains unknown. This study aimed to investigate the effects of MTNR1B rs10830963 on fasting glucose, type 2 diabetes and sleep status in Chinese Hans.
  
  
  METHODS
  MTNR1B rs10830963 was genotyped in a population-based cohort including 3,210 unrelated Chinese Hans from Beijing and Shanghai, and tested for associations with risk of type 2 diabetes, diabetes-related traits and sleep status.
  
  
  RESULTS
  We confirmed the associations of MTNR1B rs10830963 with fasting glucose (beta = 0.11 mmol/l, 95%CI [0.03, 0.18], P = 0.005), glycated hemoglobin (HbA1c) (beta = 0.07%, 95%CI [0.02,0.12], P = 0.004) and homeostasis model assessment of beta-cell function (HOMA-B) (beta = -5.01%, 95%CI [-8.24,-1.77], P = 0.003) in the Shanghai, but not in the Beijing subpopulation (P >or= 0.58). The effect size of MTNR1B rs10830963 on fasting glucose in Shanghai Chinese Hans was comparable to that reported from other Asian populations. We found no evidence of associations with type 2 diabetes (OR 1.05 [0.90-1.23], P = 0.54), homeostasis model assessment of insulin sensitivity (HOMA-S) (P = 0.86) or sleep status (P >or= 0.44).
  
  
  CONCLUSIONS
  A common variant in MTNR1B was associated with fasting glucose, HbA1C and HOMA-B but not with sleep status in Chinese Hans from Shanghai, strengthening the role of MTNR1B rs10830963 in fasting glycemia and impaired beta-cell function.
authors.affiliation: Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Liu
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.forename: Huaixing
authors.initials: H
authors.lastname: Li
authors.forename: Qibin
authors.initials: Q
authors.lastname: Qi
authors.forename: Claudia
authors.initials: C
authors.lastname: Langenberg
authors.forename: Ruth J F
authors.initials: RJ
authors.lastname: Loos
authors.forename: Xu
authors.initials: X
authors.lastname: Lin
mesh_terms: D044466:Asian People / Q000235:genetics*; D001786:Blood Glucose / Q000378:metabolism*; D002681:China / Q000208:ethnology; D015331:Cohort Studies; D005006:Ethnicity / Q000235:genetics; D005215:Fasting / Q000097:blood / Q000378:metabolism*; D014644:Genetic Variation; D006442:Glycated Hemoglobin / Q000378:metabolism*; D006706:Homeostasis / Q000235:genetics; D006801:Humans; D007333:Insulin Resistance / Q000235:genetics; D050417:Insulin-Secreting Cells / Q000378:metabolism / Q000473:pathology*; D007438:Introns / Q000235:genetics; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D044123:Receptor, Melatonin, MT2 / Q000235:genetics*; D012890:Sleep / Q000235:genetics
chemical_list: D001786:Blood Glucose; D006442:Glycated Hemoglobin; D044123:Receptor, Melatonin, MT2; C517652:hemoglobin A1c protein, human
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