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Connexin 48.5 is required for normal cardiovascular function and lens development in zebrafish embryos
Shaohong Cheng1, Teresa Shakespeare, Rickie Mui
1Department of Zoology and Biochemistry and Medical Genetics, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
The Journal of Biological Chemistry
|June 24, 2004
Summary
Researchers identified Cx48.5, a zebrafish connexin protein crucial for intercellular communication. Disrupting its expression led to developmental defects in the lens, eyes, and cardiovascular system, highlighting its essential role.
Area of Science:
- Molecular Biology
- Developmental Biology
- Zebrafish Genetics
Background:
- Gap junctions, formed by connexin (Cx) proteins, are vital for intercellular communication in development and physiology.
- Understanding connexin diversity is key to deciphering cellular communication networks.
Purpose of the Study:
- To isolate and characterize a novel zebrafish connexin, Cx48.5.
- To investigate the expression patterns and functional roles of Cx48.5 in zebrafish development.
Main Methods:
- Isolation and sequencing of the Cx48.5 gene.
- Expression analysis using whole-mount in situ hybridization and RT-PCR.
- Functional characterization in Xenopus oocytes (cRNA injection).
- Antisense morpholino-mediated knockdown in zebrafish embryos.
Main Results:
- Cx48.5 shares high sequence identity with mammalian Cx46.
- Cx48.5 is expressed in the lens, heart, testis, and embryonic otic vesicles.
- Cx48.5 mediates intercellular electrical coupling and functions as a hemichannel in oocytes.
- Cx48.5 knockdown results in lens and eye size reduction, and severe cardiovascular abnormalities.
Conclusions:
- Cx48.5 is a functional gap junction protein essential for zebrafish lens homeostasis.
- Cx48.5 plays a critical role in embryonic development, particularly in eye and cardiovascular formation.