Neonatal mortality and leanness in mice lacking the ARID transcription factor Mrf-2

Proteins containing the ARID (AT-rich interaction domain) DNA-binding motif regulate gene expression and differentiation in fungi, plants, and animals. This report describes phenotypes resulting from targeted disruption of the ARID gene Mrf-2. Homozygous loss of Mrf-2 resulted in a high rate of neon...

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Veröffentlicht in:Biochemical and biophysical research communications 2003-12, Vol.312 (4), p.997-1004
Hauptverfasser: Whitson, Robert H, Tsark, Walter, Huang, Ting H, Itakura, Keiichi
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creator Whitson, Robert H
Tsark, Walter
Huang, Ting H
Itakura, Keiichi
description Proteins containing the ARID (AT-rich interaction domain) DNA-binding motif regulate gene expression and differentiation in fungi, plants, and animals. This report describes phenotypes resulting from targeted disruption of the ARID gene Mrf-2. Homozygous loss of Mrf-2 resulted in a high rate of neonatal mortality that was partially strain-dependent: survival of Mrf-2 −/− pups ranged from 6.4% on the 129S1 genetic background to 38% on a mixed 129S1·C57Bl/6J background. Loss of Mrf-2 expression did not affect embryonic survival, embryonic growth or birth weight. Lipid accumulation was severely reduced in brown adipose of Mrf-2 −/− neonates at 24 h of age, however, and Mrf-2 −/− mice weighed significantly less than controls from postnatal day five onward. Adult Mrf-2 −/− mice were lean, with significant reductions in brown and white adipose tissues, and in the percentage of body fat. Mrf-2 −/− and Mrf-2 +/− mice were also resistant to weight gains and obesity when maintained on high-fat diets. These phenotypes suggest that Mrf-2 is essential for accumulation of lipid stores in postnatal life.
doi_str_mv 10.1016/j.bbrc.2003.11.026
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subjects Adipose Tissue - metabolism
Adipose Tissue - pathology
Aging - physiology
Animals
Animals, Newborn
AT-rich interaction domain
Body Constitution - physiology
Body Weight - physiology
Brown adipose tissue
Diet-induced obesity
Dietary Fats - metabolism
DNA-Binding Proteins - deficiency
DNA-Binding Proteins - genetics
DNA-Binding Proteins - metabolism
Leanness
Mice
Mice, Inbred C57BL
Mrf-2 protein
Myogenic Regulatory Factors - genetics
Neonatal mortality
Phenotype
Sex Factors
Structure-Activity Relationship
Survival Rate
Thinness - genetics
Thinness - metabolism
Transcription Factors
White adipose tissue
title Neonatal mortality and leanness in mice lacking the ARID transcription factor Mrf-2
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