RUNX regulates stem cell proliferation and differentiation: Insights from studies of C. elegans

Hiroshi Kagoshima, Katsuya Shigesada, Yuji Kohara

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


The RUNX genes encode conserved transcription factors that play vital roles in the development of various animals and human diseases. Recent studies by a few groups including ours have demonstrated that this gene family, as represented by a single ortholog designeated rnt-1, also occurs and plays intriguing roles in the simple model organism, Caenorhabditis elegans. Our genetic and molecular analyses revealed that rnt-1 is allelic to mab-2, which had previously been known to cause an abnormal development of the male tail. rnt-1 was further shown to be predominantly expressed in the stem cell-like lateral seam hypodermal cells. These cells are characterized by their abilities to undergo stem cell-like asymmetric divisions giving rise to self-renewing seam cells and various differentiated descendants of hypodermal and neuronal fates. We found that rnt-1 mutants exhibit an impaired asymmetry in the division of T cells, the posterior-most member of the seam cells. Mutant analysis indicated that rnt-1 is involved in regulating T blast cell polarity in cooperation with the Wnt signaling pathway. On the other hand, Nimmo et al. independently discovered that rnt-1 acts as a rate limiting regulator of cell proliferation in the seam cells, V1-6. In this review, we will outline these new findings and discuss their general implications in the mechanism of coordination between proliferation and differentiation of stem cells.

Original languageEnglish
Pages (from-to)1119-1130
Number of pages12
JournalJournal of Cellular Biochemistry
Issue number5
Publication statusPublished - Apr 1 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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