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J Biol Chem, Vol. 274, Issue 40, 28067-28070, October 1, 1999
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From the The myb gene family has three
members, c-myb, A-myb, and B-myb,
which have distinct expression patterns. Analyses of c-myb and A-myb mutant mice have indicated that c-myb
and A-myb are important for hematopoiesis and
spermatogenesis, respectively. However, there has been no evidence for
a role for B-myb in development. To examine the role of
B-myb in development, we generated
B-myb-deficient mice by gene targeting. Although the
heterozygous mutants were healthy, the homozygous mutants died at an
early stage of development, around E4.5-E6.5. In vitro
culture of blastocyst indicated that B-myb is required for
inner cell mass formation. Consistent with the important role of
B-myb in early embryonic development, only B-myb among myb family members was expressed in
embryonic stem cells. These results indicate that each of the three
members of the myb gene family plays a distinct role during development.
Laboratory of Molecular Genetics,
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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