Shaping the zebrafish heart: from left-right axis specification to epithelial tissue morphogenesis

Area of Science:

• Developmental Biology
• Embryology
• Organogenesis

Background:

• Vertebrates exhibit external bilateral symmetry but internal organ asymmetry based on the left/right (L/R) axis.
• L/R axis determination differs from anterior-posterior and dorsal-ventral patterning.
• A conserved ciliated organ initiates left-sided gene expression, including Nodal, in the left lateral plate mesoderm.

Purpose of the Study:

• To review the current understanding of L/R patterning mechanisms during zebrafish development.
• To elucidate how L/R patterning influences cardiac morphogenesis.
• To explore the link between L/R signaling and cellular responses driving organ development.

Main Methods:

• Review of existing literature on L/R axis determination and cardiac morphogenesis in zebrafish.
• Analysis of studies investigating gene expression patterns (e.g., Nodal) and cellular responses.
• Focus on zebrafish as a model organism for studying organ laterality.

Main Results:

• L/R axis determination involves a ciliated organ inducing left-sided gene expression programs.
• Nodal expression in the left lateral plate mesoderm is a key component of L/R patterning.
• Recent insights highlight a strong connection between L/R signaling and cellular mechanisms driving cardiac morphogenesis.

Conclusions:

• Understanding L/R patterning is essential for comprehending organ laterality.
• Zebrafish provide a valuable model for studying the intricate relationship between L/R signaling and cardiac development.
• Further research into L/R signaling and cellular responses will advance our knowledge of organogenesis.