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Kenneth D. Poss,*Lindsay G. Wilson,Mark T. Keating*
Cardiac injury in mammals and amphibians typically leads
to scarring, with minimal regeneration of heart muscle. Here, wedemonstrate histologically that zebrafish fully regenerate heartswithin 2 months of 20% ventricular resection. Regeneration occursthrough robust proliferation of cardiomyocytes localized at theleading
epicardial edge of the new myocardium. The hearts of zebrafishwith
mutations in the Mps1 mitotic checkpoint kinase, a criticalcell cycle
regulator, failed to regenerate and formed scars. Thus,injury-induced
cardiomyocyte proliferation in zebrafish can overcomescar formation,
allowing cardiac muscle regeneration. These findingsindicate that
zebrafish will be useful for genetically dissectingthe molecular
mechanisms of cardiac regeneration.
Department of Cell Biology, Department of Cardiology, Howard
Hughes Medical Institute, Harvard Medical School, Children's Hospital,
320 Longwood Avenue, Boston, MA 02115, USA.
*
To whom correspondence should be addressed. E-mail:
kposs{at}enders.tch.harvard.edu(K.D.P.); mkeating{at}enders.tch.harvard.edu(M.T.K.)
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