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Published on: July 30, 2015
Zebrafish Suppressor of Cytokine Signaling 4b (Socs4b) Is Dispensable for Development but May Regulate Epidermal
Monique Trengove1, Parisa Rasighaemi1, Clifford Liongue1,2
1School of Medicine, Deakin University, Geelong, VIC 3216, Australia.
Abstract:
The suppressor of cytokine signaling (SOCS) family of proteins were named after their defining role as negative feedback regulators of signaling initiated by numerous cytokine receptors. However, multiple members of the SOCS family likely function outside of this paradigm, including SOCS4. Zebrafish possess two SOCS4 paralogues, with socs4a previously shown to participate in central nervous system development and function. This study examined the role of the other paralogue, socs4b, through expression analysis and functional investigations in vivo and in vitro. This revealed maternal deposition of socs4b mRNA, specific zygotic expression during late embryogenesis, including in the brain, eye and intestine, and broad adult expression that was highest in the brain. A mutant allele, socs4bΔ18, was generated by genome editing, in which the start codon was deleted. Fish homozygous for this likely hypomorphic allele showed no overt developmental phenotypes. However, in vitro studies suggested the Socs4b protein may be able to regulate EGFR signaling.
Insights
Suppressor of cytokine signaling 4b (SOCS4B) exhibits specific expression patterns in zebrafish, including the brain, eyes, and intestine. While a knockout mutant showed no developmental issues, in vitro data suggests SOCS4B may regulate EGFR signaling.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- The suppressor of cytokine signaling (SOCS) family regulates cytokine receptor signaling.
- SOCS proteins are negative feedback regulators, but some members may have distinct roles.
- Zebrafish have two SOCS4 paralogues; SOCS4a is involved in central nervous system development.
Purpose of the Study:
- To investigate the role of the zebrafish SOCS4B paralogue.
- To analyze SOCS4B expression patterns and functional significance.
Main Methods:
- Expression analysis of SOCS4B mRNA during zebrafish development.
- Generation of a zebrafish socs4b mutant allele (socs4bΔ18) using genome editing.
- In vivo assessment of homozygous mutant zebrafish phenotypes.
- In vitro studies to explore potential protein functions.
Main Results:
- SOCS4B mRNA shows maternal deposition and zygotic expression in late embryogenesis (brain, eye, intestine).
- Adult zebrafish display broad SOCS4B expression, predominantly in the brain.
- Homozygous socs4bΔ18 mutant zebrafish exhibit no overt developmental abnormalities.
- In vitro experiments indicate a potential role for SOCS4B in regulating EGFR signaling.
Conclusions:
- SOCS4B has a distinct expression profile in zebrafish, particularly in neural and sensory tissues.
- The absence of a phenotype in the socs4b mutant suggests functional redundancy or compensation.
- In vitro findings highlight a potential, unconfirmed role for SOCS4B in EGFR pathway regulation.
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