title: No important role for genetic variation in the Chibby gene in monogenic and complex obesity.
abstract: Chibby (CBY) has been identified as a potent proadipogenic factor required for adipocyte differentiation. It has been shown that CBY inhibits the canonical Wnt pathway, and therefore promotes the development of new fat cells. Our objective therefore is to investigate the contribution of rare and common genetic variation in CBY to the development of human obesity. A mutation analysis was performed on a total of 566 obese patients and 432 lean individuals. To investigate the involvement of CBY in complex obesity, we performed a genetic association analysis of the entire CBY gene region on 1,011 obese individuals and 523 control samples. Four rare, novel variants were identified in either obese patients or lean control subjects, among which two non-synonymous variations and one frameshift mutation. In addition, four previously reported CBY variants were found. In the association analysis, logistic and linear regression showed no association between common genetic variation in CBY and obesity parameters. Several novel variations were found, but no definite role in the pathogenesis of obesity could be confirmed. Results from the association analysis suggest that common variation in CBY is not a cause for obesity in the Belgian population.
authors: Department of Medical Genetics, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium.
authors: Jasmijn K
authors: JK
authors: Van Camp
authors: Doreen
authors: D
authors: Zegers
authors: Stijn L
authors: SL
authors: Verhulst
authors: Kim
authors: K
authors: Van Hoorenbeeck
authors: Guy
authors: G
authors: Massa
authors: An
authors: A
authors: Verrijken
authors: Kristine N
authors: KN
authors: Desager
authors: Luc F
authors: LF
authors: Van Gaal
authors: Wim
authors: W
authors: Van Hul
authors: Sigri
authors: S
authors: Beckers
mesh_terms: D000293:Adolescent; D000328:Adult; D000483:Alleles; D001530:Belgium; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism; D016022:Case-Control Studies; D002648:Child; D005260:Female; D005787:Gene Frequency; D056726:Genetic Association Studies; D014644:Genetic Variation; D005838:Genotype; D006801:Humans; D008297:Male; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics* / Q000378:metabolism; D009765:Obesity / Q000235:genetics* / Q000378:metabolism; D016017:Odds Ratio; D044465:White People / Q000235:genetics; D060449:Wnt Signaling Pathway
chemical_list: C473750:CBY1 protein, human; D002352:Carrier Proteins; D009687:Nuclear Proteins
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