A mouse model for the metabolic effects of the human fat mass and obesity associated FTO gene.

Abstract:

:Human FTO gene variants are associated with body mass index and type 2 diabetes. Because the obesity-associated SNPs are intronic, it is unclear whether changes in FTO expression or splicing are the cause of obesity or if regulatory elements within intron 1 influence upstream or downstream genes. We tested the idea that FTO itself is involved in obesity. We show that a dominant point mutation in the mouse Fto gene results in reduced fat mass, increased energy expenditure, and unchanged physical activity. Exposure to a high-fat diet enhances lean mass and lowers fat mass relative to control mice. Biochemical studies suggest the mutation occurs in a structurally novel domain and modifies FTO function, possibly by altering its dimerisation state. Gene expression profiling revealed increased expression of some fat and carbohydrate metabolism genes and an improved inflammatory profile in white adipose tissue of mutant mice. These data provide direct functional evidence that FTO is a causal gene underlying obesity. Compared to the reported mouse FTO knockout, our model more accurately reflects the effect of human FTO variants; we observe a heterozygous as well as homozygous phenotype, a smaller difference in weight and adiposity, and our mice do not show perinatal lethality or an age-related reduction in size and length. Our model suggests that a search for human coding mutations in FTO may be informative and that inhibition of FTO activity is a possible target for the treatment of morbid obesity.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Church C,Lee S,Bagg EA,McTaggart JS,Deacon R,Gerken T,Lee A,Moir L,Mecinović J,Quwailid MM,Schofield CJ,Ashcroft FM,Cox RD

doi

10.1371/journal.pgen.1000599

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

e1000599

issue

8

eissn

1553-7390

issn

1553-7404

journal_volume

5

pub_type

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