Changes in nucleosome occupancy associated with metabolic alterations in aged mammalian liver.

Cell Rep
Authors
Keywords
Abstract

Aging is accompanied by physiological impairments, which, in insulin-responsive tissues, including the liver, predispose individuals to metabolic disease. However, the molecular mechanisms underlying these changes remain largely unknown. Here, we analyze genome-wide profiles of RNA and chromatin organization in the liver of young (3 months) and old (21 months) mice. Transcriptional changes suggest that derepression of the nuclear receptors PPARα, PPARγ, and LXRα in aged mouse liver leads to activation of targets regulating lipid synthesis and storage, whereas age-dependent changes in nucleosome occupancy are associated with binding sites for both known regulators (forkhead factors and nuclear receptors) and candidates associated with nuclear lamina (Hdac3 and Srf) implicated to govern metabolic function of aging liver. Winged-helix transcription factor Foxa2 and nuclear receptor corepressor Hdac3 exhibit a reciprocal binding pattern at PPARα targets contributing to gene expression changes that lead to steatosis in aged liver.

Year of Publication
2014
Journal
Cell Rep
Volume
9
Issue
3
Pages
996-1006
Date Published
2014 Nov 06
ISSN
2211-1247
DOI
10.1016/j.celrep.2014.09.048
PubMed ID
25437555
PubMed Central ID
PMC4250828
Links
Grant list
K01 DK101633 / DK / NIDDK NIH HHS / United States
DK-101633 / DK / NIDDK NIH HHS / United States
T32 HG002295 / HG / NHGRI NIH HHS / United States
P50 HG006193 / HG / NHGRI NIH HHS / United States
Howard Hughes Medical Institute / United States