microRNA-133a regulates cardiomyocyte proliferation and suppresses smooth muscle gene expression in the heart

Ning Liu, Svetlana Bezprozvannaya, Andrew H. Williams, Xiaoxia Qi, James A. Richardson, Rhonda Bassel-Duby, Eric N. Olson

Research output: Contribution to journalArticle

536 Citations (Scopus)

Abstract

MicroRNAs (miRNAs) modulate gene expression by inhibiting mRNA translation and promoting mRNA degradation, but little is known of their potential roles in organ formation or function. miR-133a-1 and miR-133a-2 are identical, muscle-specific miRNAs that are regulated during muscle development by the SRF transcription factor. We show that mice lacking either miR-133a-1 or miR-133a-2 are normal, whereas deletion of both miRNAs causes lethal ventricular-septal defects in approximately half of double-mutant embryos or neonates; miR-133a double-mutant mice that survive to adulthood succumb to dilated cardiomyopathy and heart failure. The absence of miR-133a expression results in ectopic expression of smooth muscle genes in the heart and aberrant cardiomyocyte proliferation. These abnormalities can be attributed, at least in part, to elevated expression of SRF and cyclin D2, which are targets for repression by miR-133a. These findings reveal essential and redundant roles for miR-133a-1 and miR-133a-2 in orchestrating cardiac development, gene expression, and function and point to these miRNAs as critical components of an SRF-dependent myogenic transcriptional circuit.

Original languageEnglish (US)
Pages (from-to)3242-3254
Number of pages13
JournalGenes and Development
Volume22
Issue number23
DOIs
StatePublished - Dec 1 2008

Fingerprint

MicroRNAs
Cardiac Myocytes
Smooth Muscle
Gene Expression
Cyclin D2
Serum Response Factor
Muscle Development
Ventricular Heart Septal Defects
RNA Stability
Dilated Cardiomyopathy
Protein Biosynthesis
Embryonic Structures
Heart Failure
Muscles
Genes

Keywords

  • Cyclin D2
  • Heart development
  • microRNA
  • Myocyte enhancer factor-2
  • Serum response factor

ASJC Scopus subject areas

  • Genetics
  • Developmental Biology

Cite this

microRNA-133a regulates cardiomyocyte proliferation and suppresses smooth muscle gene expression in the heart. / Liu, Ning; Bezprozvannaya, Svetlana; Williams, Andrew H.; Qi, Xiaoxia; Richardson, James A.; Bassel-Duby, Rhonda; Olson, Eric N.

In: Genes and Development, Vol. 22, No. 23, 01.12.2008, p. 3242-3254.

Research output: Contribution to journalArticle

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