Journal article
A novel role for MAPKAPK2 in morphogenesis during zebrafish development
PLoS genetics, Vol.5(3), e1000413
03/2009
DOI: 10.1371/journal.pgen.1000413
PMCID: PMC2652113
PMID: 19282986
Abstract
One of the earliest morphogenetic processes in the development of many animals is epiboly. In the zebrafish, epiboly ensues when the animally localized blastoderm cells spread, thin over, and enclose the vegetally localized yolk. Only a few factors are known to function in this fundamental process. We identified a maternal-effect mutant, betty boop (bbp), which displays a novel defect in epiboly, wherein the blastoderm margin constricts dramatically, precisely when half of the yolk cell is covered by the blastoderm, causing the yolk cell to burst. Whole-blastoderm transplants and mRNA microinjection rescue demonstrate that Bbp functions in the yolk cell to regulate epiboly. We positionally cloned the maternal-effect bbp mutant gene and identified it as the zebrafish homolog of the serine-threonine kinase Mitogen Activated Protein Kinase Activated Protein Kinase 2, or MAPKAPK2, which was not previously known to function in embryonic development. We show that the regulation of MAPKAPK2 is conserved and p38 MAP kinase functions upstream of MAPKAPK2 in regulating epiboly in the zebrafish embryo. Dramatic alterations in calcium dynamics, together with the massive marginal constrictive force observed in bbp mutants, indicate precocious constriction of an F-actin network within the yolk cell, which first forms at 50% epiboly and regulates epiboly progression. We show that MAPKAPK2 activity and its regulator p38 MAPK function in the yolk cell to regulate the process of epiboly, identifying a new pathway regulating this cell movement process. We postulate that a p38 MAPKAPK2 kinase cascade modulates the activity of F-actin at the yolk cell margin circumference allowing the gradual closure of the blastopore as epiboly progresses.
Details
- Title: Subtitle
- A novel role for MAPKAPK2 in morphogenesis during zebrafish development
- Creators
- Beth A Holloway - University of PennsylvaniaSol Gomez de la Torre CannyDiane C SlusarskiYing Ye - University of PennsylvaniaChristina M FreisingerRoland DoschMargaret M ChouDaniel S WagnerMary C Mullins
- Resource Type
- Journal article
- Publication Details
- PLoS genetics, Vol.5(3), e1000413
- DOI
- 10.1371/journal.pgen.1000413
- PMID
- 19282986
- PMCID
- PMC2652113
- NLM abbreviation
- PLoS Genet
- ISSN
- 1553-7390
- eISSN
- 1553-7404
- Publisher
- United States
- Grant note
- HD050901 / NICHD NIH HHS\r\nR01 GM077429 / NIGMS NIH HHS\r\n5R01GM077429 / NIGMS NIH HHS\r\nCA112369 / NCI NIH HHS\r\nR01 HD050901 / NICHD NIH HHS\r\nR01 CA081415 / NCI NIH HHS\r\nR01 CA112369 / NCI NIH HHS
- Language
- English
- Date published
- 03/2009
- Academic Unit
- Biology
- Record Identifier
- 9983991991602771
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