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© Research
Publication : The Journal of cell biology

Oriented clonal cell growth in the developing mouse myocardium underlies cardiac morphogenesis

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of cell biology - 01 Jan 2004

Meilhac SM, Esner M, Kerszberg M, Moss JE, Buckingham ME

Link to Pubmed [PMID] – 14709543

J. Cell Biol. 2004 Jan;164(1):97-109

During heart morphogenesis, cardiac chambers arise by differential expansion of regions of the primitive cardiac tube. This process is under the control of specific transcription factors such as Tbx5 and dHAND. To gain insight into the cellular mechanisms that underlie cardiogenesis, we have used a retrospective clonal approach based on the spontaneous recombination of an nlaacZ reporter gene targeted to the murine alpha-cardiac actin locus. We show that clonal growth of myocardial cells is oriented. At embryonic day (E) 10.5, the shape of clones is characteristic of a given cardiac region and reflects its morphology. This is already detectable in the primitive cardiac tube at E8.5, and is maintained after septation at E14.5 with additional modulations. The clonal analysis reveals new subdivisions of the myocardium, including an interventricular boundary region. Our results show that the myocardium, from the time of its formation, is a polarized and regionalized tissue and point to the role of oriented clonal cell growth in cardiac chamber morphogenesis.

http://www.ncbi.nlm.nih.gov/pubmed/14709543