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Early B-Cell Factor, E2A, and Pax-5 Cooperate To Activate the Early B Cell-Specific mb-1 Promoter.

  • Mikael Sigvardsson
  • Dawn R Clark
  • Daniel Fitzsimmons
  • Michelle Doyle
  • Peter Åkerblad
  • Thomas Breslin
  • Sven Bilke
  • Ronggui Li
  • Carmen Yeamans
  • Gongyi Zhang
  • James Hagman
Publiceringsår: 2002
Språk: Engelska
Sidor: 8539-8551
Publikation/Tidskrift/Serie: Molecular and Cellular Biology
Volym: 22
Nummer: 24
Dokumenttyp: Artikel i tidskrift
Förlag: American Society for Microbiology


Previous studies have suggested that the early-B-cell-specific mb-1(Ig{alpha}) promoter is regulated by EBF and Pax-5. Here, we used in vivo footprinting assays to detect occupation of binding sites in endogenous mb-1 promoters at various stages of B-cell differentiation. In addition to EBF and Pax-5 binding sites, we detected occupancy of a consensus binding site for E2A proteins (E box) in pre-B cells. EBF and E box sites are crucial for promoter function in transfected pre-B cells, and EBF and E2A proteins synergistically activated the promoter in transfected HeLa cells. Other data suggest that EBF and E box sites are less important for promoter function at later stages of differentiation, whereas binding sites for Pax-5 (and its Ets ternary complex partners) are required for promoter function in all mb-1-expressing cells. Using DNA microarrays, we found that expression of endogenous mb-1 transcripts correlates most closely with EBF expression and negatively with Id1, an inhibitor of E2A protein function, further linking regulation of the mb-1 gene with EBF and E2A. Together, our studies demonstrate the complexity of factors regulating tissue-specific transcription and support the concept that EBF, E2A, and Pax-5 cooperate to activate target genes in early B-cell development.


  • Cell and Molecular Biology


  • ISSN: 0270-7306

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