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pubmed-article:15143159pubmed:abstractTextMolecular mechanisms for the dorso-ventral patterning and interventricular septum formation in the embryonic heart are unknown. To investigate a role of Hand1/eHAND in cardiac chamber formation, we generated Hand1/eHAND knock-in mice where Hand1/eHAND cDNA was placed under the control of the MLC2V promoter. In Hand1/eHAND knock-in mice, the outer curvature of the right and left ventricles expanded more markedly. Moreover, there was no interventricular groove or septum formation, although molecularly, Hand1/eHAND knock-in hearts had two ventricles. However, the morphology of the inner curvature of the ventricles, the atrioventricular canal, and the outflow tract was not affected by Hand1/eHAND expression. Furthermore, expression of Hand1/eHAND in the whole ventricles altered the expression patterns of Chisel, ANF, and Hand2/dHAND but did not affect Tbx5 expression. In contrast, the interventricular septum formed normally in transgenic embryos overexpressing Hand1/eHAND in the right ventricle but not in the boundary region. These results suggested that Hand1/eHAND is involved in expansion of the ventricular walls and that absence of Hand1/eHAND expression in the boundary region between the right and left ventricles may be critical in the proper formation of the interventricular groove and septum. Furthermore, Hand1/eHAND is not a master regulatory gene that specifies the left ventricle myocyte lineage but may control the dorso-ventral patterning in concert with additional genes.lld:pubmed
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pubmed-article:15143159pubmed:authorpubmed-author:KitaToruTlld:pubmed
pubmed-article:15143159pubmed:authorpubmed-author:TanakaMakotoMlld:pubmed
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pubmed-article:15143159pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:15143159pubmed:articleTitleRole of Hand1/eHAND in the dorso-ventral patterning and interventricular septum formation in the embryonic heart.lld:pubmed
pubmed-article:15143159pubmed:affiliationDepartment of Social Service, Kyoto University Hospital, 54 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan. makoto@kuhp.kyoto-u.ac.jplld:pubmed
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