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Bimolecular Fluorescence Complementation
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The CBFbeta subunit is essential for CBFalpha2 (AML1) function in vivo

Q Wang1, T Stacy, J D Miller

  • 1Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755, USA.

Cell
|November 15, 1996
PubMed
Summary
This summary is machine-generated.

The core-binding factor beta (CBFbeta) subunit is essential for CBFalpha2 function. Homozygous mutation of the CBFB gene leads to embryonic lethality and hematopoietic defects, similar to CBFA2 gene disruption.

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Area of Science:

  • Hematopoiesis
  • Molecular Biology
  • Genetics

Background:

  • Core-binding factor beta (CBFbeta) is a non-DNA-binding subunit of the heterodimeric core-binding factor (CBF).
  • CBFbeta enhances the DNA-binding affinity of CBFalpha subunits.
  • Genes CBFB and CBFA2 are frequently implicated in chromosomal translocations in human acute leukemias.

Purpose of the Study:

  • To investigate the in vivo function of the CBFbeta subunit.
  • To determine if CBFbeta is required for CBFalpha2 function.
  • To compare the phenotype of Cbfb gene disruption with Cbfa2 gene disruption.

Main Methods:

  • Generation of mice with homozygous disruption of the Cbfb gene.
  • Phenotypic analysis of mutant mice, including assessment of embryonic lethality, central nervous system hemorrhaging, and fetal liver hematopoiesis.

Main Results:

  • Homozygous mutation of the Cbfb gene resulted in embryonic lethality at midgestation.
  • Mutant embryos exhibited central nervous system hemorrhaging and blocked fetal liver hematopoiesis.
  • The observed phenotype was identical to that of homozygous Cbfa2 (AML1) gene disruption.

Conclusions:

  • The CBFbeta subunit is indispensable for CBFalpha2 function in vivo.
  • CBFbeta plays a critical role in embryonic development and hematopoiesis.
  • These findings highlight the importance of the CBFbeta-CBFalpha2 complex in preventing acute leukemias.