Requirement for intracellular calcium modulation in zebrafish dorsal-ventral patterning

Area of Science:

• Developmental Biology
• Cell Signaling
• Molecular Biology

Background:

• The phosphoinositide (PI) cycle is a key signal transduction pathway.
• This pathway generates intracellular second messengers and triggers calcium release.
• Calcium signaling plays a role in various cellular processes, including embryonic development.

Purpose of the Study:

• To investigate the role of PI cycle-mediated calcium release in zebrafish body plan formation.
• To determine if disrupting the PI cycle impacts embryonic patterning.
• To elucidate the relationship between calcium release, Wnt/beta-catenin signaling, and embryonic development.

Main Methods:

• Systematic inhibition of PI cycle function at three distinct steps in zebrafish embryos.
• Depletion of internal calcium stores.
• Analysis of endogenous calcium release, Wnt/beta-catenin signaling, beta-catenin subcellular localization, and expression of beta-catenin target genes.

Main Results:

• Inhibition of PI cycle function impacted endogenous calcium release and Wnt/beta-catenin signaling.
• Disruption of calcium modulation led to dose-dependent hyperdorsalized phenotypes.
• PI cycle inhibition resulted in ectopic dorsal-signaling centers, evidenced by altered beta-catenin localization and target gene expression.

Conclusions:

• Modulation of calcium release is critical for early embryonic patterning in zebrafish.
• The PI cycle influences embryonic patterning by affecting the stabilization of beta-catenin protein.
• Calcium signaling is a vital component in the Wnt/beta-catenin pathway during body plan formation.