Polymorphisms of the FTO gene are associated with variation in energy intake, but not energy expenditure.
The FTO gene has significant polymorphic variation associated with obesity, but its function is unknown. We screened a population of 150 whites (103F/47M) resident in NE Scotland, United Kingdom, for variants of the FTO gene and linked these to phenotypic variation in their energy expenditure (basal metabolic rate (BMR) and maximal oxygen consumption VO(2)max) and energy intake. There was no significant association between the FTO genotype and BMR or VO(2)max. The FTO genotype was significantly associated (P = 0.024) with variation in energy intake, with average daily intake being 9.0 MJ for the wild-type TT genotype and 10.2 and 9.5 MJ for the "at risk" AT and AA genotypes, respectively. Adjusting intake for BMR did not remove the significance (P = 0.043). FTO genotype probably affects obesity via effects on food intake rather than energy expenditure.
Speakman
John R
JR
Division of Obesity and Metabolic Health, Rowett Research Institute, Aberdeen, Scotland, UK. j.speakman@abdn.ac.uk
Rance
Kellie A
KA
Johnstone
Alexandra M
AM
D000328:Adult; D000071516:Alpha-Ketoglutarate-Dependent Dioxygenase FTO; D001481:Basal Metabolism / Q000235:genetics; D002149:Energy Intake / Q000235:genetics*; D004734:Energy Metabolism / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology / Q000235:genetics; D010101:Oxygen Consumption / Q000235:genetics; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D011506:Proteins / Q000235:genetics*; D012307:Risk Factors; D012606:Scotland
D011506:Proteins; D000071516:Alpha-Ketoglutarate-Dependent Dioxygenase FTO; C526492:FTO protein, human