Jmjd3 controls mesodermal and cardiovascular differentiation of embryonic stem cells

Area of Science:

• Epigenetics
• Developmental Biology
• Stem Cell Biology

Background:

• The precise developmental functions of H3K27 demethylases, particularly Jmjd3, remain incompletely understood.
• Investigating Jmjd3's epigenetic regulation of target genes in response to developmental signals is crucial.

Purpose of the Study:

• To elucidate the role of Jmjd3 in mesoderm and cardiovascular lineage commitment.
• To understand Jmjd3's contribution to early embryonic development.

Main Methods:

• Utilized mouse embryonic stem cells with Jmjd3 ablation.
• Analyzed effects on pluripotency, self-renewal, and differentiation pathways.
• Investigated epigenetic modifications at the Brachyury promoter.

Main Results:

• Jmjd3 deficiency did not impair pluripotency or self-renewal.
• Mesoderm, endothelial, and cardiac differentiation were compromised upon Jmjd3 ablation.
• Jmjd3 was shown to reduce H3K27me3 marks at the Brachyury promoter.
• Jmjd3 facilitates β-catenin recruitment, essential for Wnt-induced mesoderm differentiation.

Conclusions:

• Jmjd3 is a critical regulator for mesoderm differentiation.
• Jmjd3 plays a necessary role in cardiovascular lineage commitment.
• These findings highlight Jmjd3's importance in developmental signaling pathways.