Metabolic programming a lean phenotype by deregulation of RNA polymerase III.

Détails

ID Serval
serval:BIB_A367517CB95B
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Metabolic programming a lean phenotype by deregulation of RNA polymerase III.
Périodique
Proceedings of the National Academy of Sciences of the United States of America
Auteur(s)
Willis I.M., Moir R.D., Hernandez N.
ISSN
1091-6490 (Electronic)
ISSN-L
0027-8424
Statut éditorial
Publié
Date de publication
27/11/2018
Peer-reviewed
Oui
Volume
115
Numéro
48
Pages
12182-12187
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
As a master negative regulator of RNA polymerase (Pol) III, Maf1 modulates transcription in response to nutrients and stress to balance the production of highly abundant tRNAs, 5S rRNA, and other small noncoding RNAs with cell growth and maintenance. This regulation of Pol III transcription is important for energetic economy as mice lacking Maf1 are lean and resist weight gain on normal and high fat diets. The lean phenotype of Maf1 knockout (KO) mice is attributed in part to metabolic inefficiencies which increase the demand for cellular energy and elevate catabolic processes, including autophagy/lipophagy and lipolysis. A futile RNA cycle involving increased synthesis and turnover of Pol III transcripts has been proposed as an important driver of these changes. Here, using targeted metabolomics, we find changes in the liver of fed and fasted Maf1 KO mice consistent with the function of mammalian Maf1 as a chronic Pol III repressor. Differences in long-chain acylcarnitine levels suggest that energy demand is higher in the fed state of Maf1 KO mice versus the fasted state. Quantitative metabolite profiling supports increased activity in the TCA cycle, the pentose phosphate pathway, and the urea cycle and reveals changes in nucleotide levels and the creatine system. Metabolite profiling also confirms key predictions of the futile RNA cycle hypothesis by identifying changes in many metabolites involved in nucleotide synthesis and turnover. Thus, constitutively high levels of Pol III transcription in Maf1 KO mice reprogram central metabolic pathways and waste metabolic energy through a futile RNA cycle.
Mots-clé
Animals, Body Weight, Gene Expression Regulation, Liver/metabolism, Metabolic Networks and Pathways, Metabolome, Mice, Mice, Knockout, Phenotype, RNA Polymerase III/genetics, RNA Polymerase III/metabolism, RNA, Ribosomal, 5S/genetics, RNA, Ribosomal, 5S/metabolism, RNA, Transfer/genetics, RNA, Transfer/metabolism, Repressor Proteins/genetics, Repressor Proteins/metabolism, Maf1, RNA polymerase III, futile cycle, metabolic inefficiency, metabolomics
Pubmed
Web of science
Création de la notice
19/11/2018 14:21
Dernière modification de la notice
20/08/2019 16:09
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