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Genetics, Vol 141, 1583-1595, Copyright © 1995
INVESTIGATIONS |
Temperature-Sensitive Mutations That Cause Stage-Specific Defects in Zebrafish Fin Regeneration
S. L. Johnson and J. A. Weston
Institute of Neuroscience, University of Oregon, Eugene, Oregon 97403
When amputated, the fins of adult zebrafish rapidly regenerate the missing tissue. Fin regeneration proceeds through several stages, including wound healing, establishment of the wound epithelium, recruitment of the blastema from mesenchymal cells underlying the wound epithelium, and differentiation and outgrowth of the regenerate. We screened for temperature-sensitive mutations that affect the regeneration of the fin. Seven mutations were identified, including five that fail to regenerate their fins, one that causes slow growth during regeneration, and one that causes dysmorphic bumps or tumors to develop in the regenerating fin. reg5 mutants fail to regenerate their caudal fins, whereas reg6 mutants develop dysmorphic bumps in their regenerates at the restrictive temperature. Temperature-shift experiments indicate that reg5 and reg6 affect different stages of regeneration. The critical period for reg5 occurs during the early stages of regeneration before or during establishment of the blastema, resulting in defects in subsequent growth of the blastema and failure to differentiate bone-forming cells. The critical period for reg6 occurs after the onset of bone differentiation and during early stages of regenerative outgrowth. Both reg5 and reg6 also show temperature-sensitive defects in embryonic development or in ontogenetic outgrowth of the juvenile fin.
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