Jmjd3-Mediated H3K27me3 Dynamics Orchestrate Brown Fat Development and Regulate White Fat Plasticity

Area of Science:

• Molecular Biology
• Epigenetics
• Adipocyte Biology

Background:

• Brown adipose tissue (BAT) development involves distinct transcriptional programs.
• The roles of chromatin states and epigenetic enzymes in BAT development are not fully understood.

Purpose of the Study:

• To investigate the epigenetic mechanisms governing brown adipose tissue (BAT) development.
• To identify the role of histone modifications and epigenetic enzymes in BAT fate determination and white adipose tissue (WAT) plasticity.

Main Methods:

• Analysis of chromatin states, specifically H3K27me3, in brown and white preadipocytes.
• Investigating the function of Jmjd3 (histone demethylase) in BAT-selective gene expression.
• Utilizing gain- and loss-of-function Jmjd3 transgenic mouse models.

Main Results:

• BAT development is marked by repressive H3K27me3, with Jmjd3 acting as a key demethylase.
• H3K27me3 demarcates a subset of BAT-selective genes in both brown and white preadipocytes.
• Jmjd3-mediated H3K27me3 removal is essential for BAT-selective gene expression and beige adipocyte development in vitro and in vivo.
• Jmjd3 manipulation in mice affects body weight and cold tolerance.

Conclusions:

• An epigenetic mechanism involving H3K27me3 and Jmjd3 governs BAT fate.
• Jmjd3 plays a critical role in WAT plasticity and BAT development.
• This study identifies Jmjd3 as a key regulator of adipocyte differentiation and energy homeostasis.