期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2104650118
关键词
brown adipose tissue; thermogenesis; branched chain amino acids; RNA binding protein; disordered domain protein
资金
- NIH [HL130253, AR071980, AR-067294]
- Senator Paul D. Wellstone Muscular Dystrophy Specialized Research Center [P50HD087351, 19CDA34670007]
- American Heart Association
- Harry S. Moss Heart Trust
- NIH, National Institute of Diabetes and Digestive and Kidney Diseases [R01 DK104789, R56 DK119163, R01 DK119163]
- Robert A. Welch Foundation [1-0025]
The discovery of FAM195A, a BAT-enriched RNA binding protein, highlights its essential role in cold-dependent thermogenesis in mice. Knockout of FAM195A results in whitening of BAT and impaired thermoregulation, affecting the response to cold significantly.
Homeothermic vertebrates produce heat in cold environments through thermogenesis, in which brown adipose tissue (BAT) increases mitochondrial oxidation along with uncoupling of the electron transport chain and activation of uncoupling protein 1 (UCP1). Although the transcription factors regulating the expression of UCP1 and nutrient oxidation genes have been extensively studied, only a few other proteins essential for BAT function have been identified. We describe the discovery of FAM195A, a BAT-enriched RNA binding protein, which is required for cold-dependent thermogenesis in mice. FAM195A knockout (KO) mice display whitening of BAT and an inability to thermoregulate. In BAT of FAM195A KO mice, enzymes involved in branched-chain amino acid (BCAA) metabolism are down-regulated, impairing their response to cold. Knockdown of FAM195A in brown adipocytes in vitro also impairs expression of leucine oxidation enzymes, revealing FAM195A to be a regulator of BCAA metabolism and a potential target for metabolic disorders.
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