Mesp1: a key regulator of cardiovascular lineage commitment

Area of Science:

• Cardiovascular Development
• Developmental Biology
• Genetics

Background:

• Mammalian heart development involves two multipotent cardiovascular progenitor (MCP) sources.
• A conserved transcriptional network regulates cardiovascular development across species.
• A master regulator for mammalian cardiac development remained unidentified until recently.

Purpose of the Study:

• To review recent findings identifying Mesp1 as a key regulator of cardiovascular progenitors in vertebrates.
• To highlight Mesp1's role in early cardiac mesoderm formation, MCP migration, and differentiation.
• To underscore the significance of Mesp1 in understanding congenital heart diseases and cellular therapies.

Main Methods:

• Review of recent studies on Mesp1 function in cardiovascular development.
• Lineage tracing in mice to identify early cardiovascular progenitor markers.
• Analysis of Mesp1/2 gene inactivation effects on cardiac mesoderm formation and MCP migration.

Main Results:

• Mesp1 is the earliest marker for cardiovascular progenitors in mice, tracing nearly all heart cells.
• Mesp genes are essential for early cardiac mesoderm formation and MCP migration.
• Mesp1 significantly promotes cardiovascular differentiation in embryonic and pluripotent stem cells, residing at the top of the regulatory hierarchy.

Conclusions:

• Mesp1 acts as a key regulator of cardiovascular progenitors in vertebrates, controlling their specification and migration.
• Understanding Mesp1's role is crucial for addressing congenital heart diseases and improving cardiovascular cell therapies.
• Mesp1's function in early cardiovascular development is conserved across chordate evolution.