Dissociation of Cardiogenic and Postnatal Myocardial Activities of GATA4
| Autor: | Mona Nemer, Joseph M. Gallagher, Emmanuel Roy, Branko V. Latinkić, Hiba Komati |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
MAPK/ERK pathway
endocrine system Transcription Genetic Cell Survival Organogenesis Regulator Cell Enlargement Xenopus Proteins Biology Xenopus laevis QH301 Serum response factor Serine medicine Animals Myocytes Cardiac Protein kinase A Molecular Biology Transcription factor Cells Cultured reproductive and urinary physiology Homeodomain Proteins GATA4 Heart Articles Cell Biology Zebrafish Proteins respiratory system Molecular biology GATA4 Transcription Factor Rats Cell biology Homeobox Protein Nkx-2.2 medicine.anatomical_structure embryonic structures cardiovascular system Phosphorylation Endoderm T-Box Domain Proteins Sequence Analysis Transcription Factors RC |
| Zdroj: | Molecular and Cellular Biology. 32:2214-2223 |
| ISSN: | 1098-5549 0270-7306 |
| DOI: | 10.1128/mcb.00218-12 |
| Popis: | Transcription factor GATA4 is a critical regulator of the embryonic and postnatal heart, but the mechanisms and cofactors required for its diverse functions are not fully understood. Here, we show that whereas the N-terminal domain of GATA4 is required for inducing cardiogenesis and for promoting postnatal cardiomyocyte survival, distinct residues and domains therein are necessary to mediate these effects. Cardiogenic activity of GATA4 requires a 24-amino-acid (aa) region (aa 129 to 152) which is needed for transcriptional synergy and physical interaction with BAF60c. The same region is not essential for induction of endoderm or blood cell markers by GATA4, suggesting that it acts as a cell-type-specific transcriptional activation domain. On the other hand, a serine residue at position 105, which is a known target for mitogen-activated protein kinase (MAPK) phosphorylation, is necessary for GATA4-dependent cardiac myocyte survival and hypertrophy but is entirely dispensable for GATA4-induced cardiogenesis. We find that S105 is differentially required for transcriptional synergy between GATA4 and serum response factor (SRF) but not other cardiac cofactors such as TBX5 and NKX2.5. The findings provide new insight into GATA4 mechanisms of action and suggest that distinct regulatory pathways regulate activities of GATA4 in embryonic development and postnatal hearts. |
| Databáze: | OpenAIRE |
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