title: The calcium-sensing receptor R990G polymorphism is associated with increased risk of hypertriglyceridemia in obese Chinese.
abstract: BACKGROUND
  We have demonstrated that the calcium-sensing receptor (CaSR) is involved in lipid metabolism; however, whether CaSR polymorphisms affect lipid metabolism in obesity is still unclear. The present study aimed to determine the effects of CaSR polymorphisms on HTG risk in obese Chinese.
  
  
  METHODS
  A total of 972 subjects with HTG and 1197 with normal triglyceride (NTG) were stratified by body mass index (BMI) into normal weight, overweight or obesity subgroups. After 12-h fasting, CaSR polymorphisms in exon 7 were determined in the blood. Serum lipids and glucose, as well as height, body weight and waist circumference were measured. The anthropometric and metabolic characteristics of the NTG subjects were re-evaluated 3 years later.
  
  
  RESULTS
  There were no genotypic or allelic distribution differences for the A986S or Q1011E polymorphisms between the NTG and HTG groups. However, the G/G genotypic and G allelic distributions of the CaSR R990G polymorphism in the HTG group were higher than the NTG group (p<0.001). After stratification, in obese subjects, the homozygous (G/G) distribution of the CaSR R990G polymorphism in the HTG group was significantly higher than in the NTG group (p=0.001), and showed an increased risk of HTG at baseline [OR=2.55, 95% CI=1.65-3.92, p<0.006]. Interaction of the CaSR R990G polymorphism with BMI was associated with increased risk of HTG (β=0.927, p<0.001). Re-evaluation of the NTG subjects revealed significantly increased serum triglyceride levels in obese homozygous versus wildtype carriers (p<0.05).
  
  
  CONCLUSIONS
  These results suggest that the CaSR R990G polymorphism is associated with increased risk of HTG, especially in obese Chinese, and may be a potential genetic predictor of diseases related to HTG.
authors.affiliation: National Key Discipline of Nutrition and Food Hygiene, Public Health College, Harbin Medical University, China; State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China.
authors.forename: Yong-Han
authors.initials: YH
authors.lastname: He
authors.forename: Wei-Lan
authors.initials: WL
authors.lastname: Kong
authors.forename: Guan
authors.initials: G
authors.lastname: Wang
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhao
authors.forename: Ming-Xin
authors.initials: MX
authors.lastname: Bi
authors.forename: Li-Xin
authors.initials: LX
authors.lastname: Na
authors.forename: Mao-Qing
authors.initials: MQ
authors.lastname: Wang
authors.forename: Ben
authors.initials: B
authors.lastname: Perry
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
mesh_terms: D000328:Adult; D002681:China; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D015228:Hypertriglyceridemia / Q000150:complications / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications / Q000235:genetics*; D011110:Polymorphism, Genetic; D044169:Receptors, Calcium-Sensing / Q000235:genetics*; D014280:Triglycerides / Q000097:blood
chemical_list: D044169:Receptors, Calcium-Sensing; D014280:Triglycerides
keywords: Adenosine 3′, 5′-cyclic monophosphate; BMI; Body mass index; CAD; CaSR; Calcium-sensing receptor; Coronary artery disease; HTG; Hypertriglyceridemia; MI; MTP; Microsomal triglyceride transfer protein; Myocardial infarction; NTG; Normal triglyceride; OR; Obesity; Odds ratio; PCR; PTH; Parathyroid hormone; Polymerase chain reaction; Polymorphism; SD; Standard deviation; TC; TG; Total cholesterol; Triglyceride; VLDL; Very-low-density lipoprotein; WHR; Waist–hip ratio; cAMP