Twist factor regulation of non-cardiomyocyte cell lineages in the developing heart

Area of Science:

• Cardiovascular Biology
• Developmental Biology
• Molecular Genetics

Background:

• The heart comprises diverse cell types essential for proper cardiac morphogenesis.
• Twist-family basic helix-loop-helix (bHLH) transcription factors regulate distinct cardiac and extra-cardiac lineages during cardiogenesis.
• Non-cardiomyocyte contributions to heart development and disease are increasingly recognized.

Purpose of the Study:

• To review the function of Twist-family bHLH proteins in extra-cardiac cell populations and the endocardium.
• To focus on regulatory mechanisms, downstream targets, and expression profiles of these factors.
• To highlight the importance of understanding these pathways for congenital and adult cardiac pathologies.

Main Methods:

• Literature review of studies on Twist-family bHLH transcription factors.
• Analysis of regulatory mechanisms, downstream targets, and expression patterns.
• Synthesis of current knowledge on their roles in cardiac development and disease.

Main Results:

• Twist-family bHLH factors exhibit distinct roles in cardiac neural crest (cNCC), epicardium, and endocardium.
• These factors regulate key molecular pathways influencing cardiac development.
• Dysfunction of these factors is linked to congenital heart diseases and adult pathologies like fibrosis.

Conclusions:

• Elucidating Twist-family bHLH functions in non-cardiomyocytes is critical for understanding congenital heart disease.
• Knowledge of these pathways is essential for developing improved treatments for adult cardiac conditions such as myocardial infarction and fibrosis.
• This review provides a foundation for future research into Twist-family bHLH-mediated cardiac pathologies.