Precardiac deletion of numb and numblike reveals renewal of cardiac progenitors

Lincoln T. Shenje, Peter Andersen, Hideki Uosaki, Laviel Fernandez, Peter P. Rainer, Gun Sik Cho, Dong Ik Lee, Weimin Zhong, Richard P. Harvey, David A. Kass, Chulan Kwon

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Cardiac progenitor cells (CPCs) must control their number and fate to sustain the rapid heart growth during development, yet the intrinsic factors and environment governing these processes remain unclear. Here, we show that deletion of the conserved cell-fate regulator Numb and its homologue Numblike (Numbl) depletes CPCs in second pharyngeal arches (PA2s) and is associated with an atrophic heart. With histological, flow cytometric and functional analyses, we find that CPCs remain undifferentiated and expansive in the PA2, but differentiate into cardiac cells as they exit the arch. Tracing of Numb-and Numbl-deficient CPCs by lineage-specific mosaicism reveals that the CPCs normally populate in the PA2, but lose their expansion potential in the PA2. These findings demonstrate that Numb and Numbl are intrinsic factors crucial for the renewal of CPCs in the PA2 and that the PA2 serves as a microenvironment for their expansion.

Original languageEnglish (US)
Article numbere02164
Issue number3
StatePublished - Apr 24 2014
Externally publishedYes

ASJC Scopus subject areas

  • Neuroscience(all)
  • Immunology and Microbiology(all)
  • Biochemistry, Genetics and Molecular Biology(all)


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