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ZFIN ID: ZDB-PUB-130816-37
Tmem88a mediates GATA-dependent specification of cardiomyocyte progenitors by restricting WNT signaling
Novikov, N., and Evans, T.
Date: 2013
Source: Development (Cambridge, England)   140(18): 3787-98 (Journal)
Registered Authors: Evans, Todd
Keywords: none
Microarrays: GEO:GSE44026
MeSH Terms:
  • Animals
  • Apoptosis/drug effects
  • Apoptosis/genetics
  • Biomarkers/metabolism
  • Body Patterning*/drug effects
  • Body Patterning*/genetics
  • Cardiomyopathies/embryology
  • Cardiomyopathies/metabolism
  • Cardiomyopathies/pathology
  • Cell Lineage/drug effects
  • Cell Lineage/genetics
  • Cell Proliferation/drug effects
  • Down-Regulation/drug effects
  • Down-Regulation/genetics
  • Embryo, Nonmammalian/metabolism
  • GATA Transcription Factors/metabolism*
  • GATA5 Transcription Factor/metabolism*
  • Gene Expression Regulation, Developmental/drug effects
  • Genetic Association Studies
  • Membrane Proteins/genetics
  • Membrane Proteins/metabolism*
  • Mesoderm/drug effects
  • Mesoderm/embryology
  • Mesoderm/metabolism
  • Morpholinos/pharmacology
  • Mutation/genetics
  • Myocardium/metabolism
  • Myocardium/pathology
  • Myocytes, Cardiac/cytology*
  • Myocytes, Cardiac/drug effects
  • Myocytes, Cardiac/metabolism
  • Organogenesis/drug effects
  • Organogenesis/genetics
  • Phenotype
  • RNA Transport/genetics
  • RNA, Messenger/genetics
  • RNA, Messenger/metabolism
  • Stem Cells/cytology
  • Stem Cells/drug effects
  • Stem Cells/metabolism*
  • Wnt Signaling Pathway*/drug effects
  • Wnt Signaling Pathway*/genetics
  • Zebrafish/embryology
  • Zebrafish/genetics
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism*
PubMed: 23903195 Full text @ Development

Biphasic control of WNT signaling is essential during cardiogenesis, but how the pathway switches from promoting cardiac mesoderm to restricting cardiomyocyte progenitor fate is unknown. We identified genes expressed in lateral mesoderm that are dysregulated in zebrafish when both gata5 and gata6 are depleted, causing a block to cardiomyocyte specification. This screen identified tmem88a, which is expressed in the early cardiac progenitor field and was previously implicated in WNT modulation by overexpression studies. Depletion of tmem88a results in a profound cardiomyopathy, secondary to impaired cardiomyocyte specification. In tmem88a morphants, activation of the WNT pathway exacerbates the cardiomyocyte deficiency, whereas WNT inhibition rescues progenitor cells and cardiogenesis. We conclude that specification of cardiac fate downstream of gata5/6 involves activation of the tmem88a gene to constrain WNT signaling and expand the number of cardiac progenitors. Tmem88a is a novel component of the regulatory mechanism controlling the second phase of biphasic WNT activity essential for embryonic cardiogenesis.