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• W2054862213 abstract "Temporally controlled mechanisms that define the unique features of ventricular and atrial cardiomyocyte identities are essential for the construction of a coordinated, morphologically intact heart. We have previously demonstrated an important role for nkx genes in maintaining ventricular identity, however, the specific timing of nkx2.5 function in distinct cardiomyocyte populations has yet to be elucidated. Here, we show that heat-shock induction of a novel transgenic line, Tg(hsp70l:nkx2.5-EGFP), during the initial stages of cardiomyocyte differentiation leads to rescue of chamber shape and identity in nkx2.5(-/-) embryos as chambers emerge. Intriguingly, our findings link an early role of this essential cardiac transcription factor with a later function. Moreover, these data reveal that nkx2.5 is also required in the second heart field as the heart tube forms, reflecting the temporal delay in differentiation of this population. Thus, our results support a model in which nkx genes induce downstream targets that are necessary to maintain chamber-specific identity in both early- and late-differentiating cardiomyocytes at discrete stages in cardiac morphogenesis. Furthermore, we show that overexpression of nkx2.5 during the first and second heart field development not only rescues the mutant phenotype, but also is sufficient for proper function of the adult heart. Taken together, these results shed new light on the stage-dependent mechanisms that sculpt chamber-specific cardiomyocytes and, therefore, have the potential to improve in vitro generation of ventricular cells to treat myocardial infarction and congenital heart disease." @default.
• W2054862213 created "2016-06-24" @default.
• W2054862213 creator A5009121202 @default.
• W2054862213 creator A5052186742 @default.
• W2054862213 creator A5058660761 @default.
• W2054862213 date "2015-04-01" @default.
• W2054862213 modified "2023-10-18" @default.
• W2054862213 title "An early requirement for nkx2.5 ensures the first and second heart field ventricular identity and cardiac function into adulthood" @default.
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• W2054862213 doi "https://doi.org/10.1016/j.ydbio.2014.12.019" @default.
• W2054862213 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4361364" @default.
• W2054862213 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25536398" @default.
• W2054862213 hasPublicationYear "2015" @default.
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