Changes in Nucleosome Occupancy Associated with Metabolic Alterations in Aged Mammalian Liver

被引：59

作者：

Bochkis, Irina M. ^{[1
]}

Przybylski, Dariusz ^{[1
]}

Chen, Jenny ^{[1
,2
]}

Regev, Aviv ^{[1
,3
]}

机构：

[1] Broad Inst MIT & Harvard, Cambridge, MA 02142 USA

[2] MIT, Div Hlth Sci & Technol, Cambridge, MA 02142 USA

[3] MIT, Howard Hughes Med Inst, Dept Biol, Cambridge, MA 02139 USA

来源：

CELL REPORTS | 2014年 / 9卷 / 03期

关键词：

TRANSCRIPTION FACTOR-BINDING; SERUM RESPONSE FACTOR; GAMMA CONTRIBUTES; DNA-DAMAGE; PPAR-GAMMA; LAMIN A/C; HISTONE; EXPRESSION; RECEPTOR; HOMEOSTASIS;

D O I：

10.1016/j.celrep.2014.09.048

中图分类号：

Q2 [细胞生物学];

学科分类号：

071013 [干细胞生物学];

摘要：

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 PPAR alpha, PPAR gamma, and LXR alpha 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 PPAR alpha targets contributing to gene expression changes that lead to steatosis in aged liver.

引用

收藏

页码：996 / 1006

页数：11

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