Association of single-nucleotide polymorphisms in MTMR9 gene with obesity.

Abstract

Genetic factors are clearly involved in the development of obesity, but the genetic background of obesity remains largely unclear. Starting from 62 663 gene-based single-nucleotide polymorphisms (SNPs) in three sequential case-control association studies, we identified a replicated association between the obesity phenotype (BMI > or =30 kg/m(2)) and a SNP (rs2293855) located in the myotublarin-related protein 9 (MTMR9) gene in the chromosomal segment 8p23-p22. P-values (minor allele dominant model) of the first set (93 cases versus 649 controls) and the second set (564 cases versus 562 controls) were 0.008 and 0.0002, respectively. The association was replicated in the third set [394 cases versus 958 controls, P = 0.005, odds ratio (95% CI) =1.40 (1.11-1.78)]. The global P-value was 0.0000005. A multiple regression analysis revealed that gender, age BMI and rs2293855 genotype (minor allele dominant model) were significantly associated with both systolic and diastolic blood pressures. MTMR9 was shown to be the only gene within the haplotype block that contained SNPs associated with obesity. Both the transcript and protein of MTMR9 were detected in the rodent lateral hypothalamic area as well as in the arcuate nucleus, and the protein co-existed with orexin, melanin concentrating hormone, neuropeptide Y and proopiomelanocortin. The levels of MTMR9 transcript in the murine hypothalamic region increased after fasting and were decreased by a high-fat diet. Our data suggested that genetic variations in MTMR9 may confer a predisposition towards obesity and hypertension through regulation of hypothalamic neuropeptides.

• Authors: Takahiro Yanagiya, Atsushi Tanabe, Aritoshi Iida, Susumu Saito, Akihiro Sekine, Atsushi Takahashi, Tatsuhiko Tsunoda, Seika Kamohara, Yoshio Nakata, Kazuaki Kotani, Ryoya Komatsu, Naoto Itoh, Ikuo Mineo, Jun Wada, Hiroaki Masuzaki, Masato Yoneda, Atsushi Nakajima, Shigeru Miyazaki, Katsuto Tokunaga, Manabu Kawamoto, Tohru Funahashi, Kazuyuki Hamaguchi, Kiyoji Tanaka, Kentaro Yamada, Toshiaki Hanafusa, Shinichi Oikawa, Hironobu Yoshimatsu, Kazuwa Nakao, Toshiie Sakata, Yuji Matsuzawa, Naoyuki Kamatani, Yusuke Nakamura, Kikuko Hotta
• Journal: Human molecular genetics (Hum Mol Genet) Vol. 16 Issue 24 Pg. 3017-26 (Dec 15 2007) ISSN: 0964-6906 [Print] England
• PMID: 17855449 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• MTMR9 protein, human
• Protein Tyrosine Phosphatases, Non-Receptor

Topics

• Animals
• Case-Control Studies
• Diet, Atherogenic
• Female
• Gene Expression Regulation, Enzymologic
• Gene Frequency
• Humans
• Hypothalamus (metabolism)
• Linkage Disequilibrium
• Male
• Mice
• Mice, Inbred C57BL
• Middle Aged
• Obesity (genetics)
• Polymorphism, Single Nucleotide
• Protein Tyrosine Phosphatases, Non-Receptor (genetics, metabolism)
• Rats
• Rats, Wistar