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J Biol Chem, Vol. 274, Issue 30, 21162-21169, July 23, 1999
From the Small Maf proteins are obligatory heterodimeric
partner molecules of mammalian Cap'n'Collar proteins that together
control a wide variety of eukaryotic genes. Although both MafK and MafG are expressed in overlapping but distinct tissue distribution patterns
during embryonic development, the physiological consequences of
loss-of-function mutations in either gene are modest. This suggested
that compensation by the third small Maf protein, MafF, might be a
major reason for such mild phenotypes and that further analysis of MafF
might therefore provide important insights for understanding small Maf
regulatory function(s). We therefore cloned, mapped, transcriptionally
and developmentally characterized, and finally disrupted the
mafF gene. We show that murine mafF is
transcriptionally regulated by three different promoters and is most
abundantly expressed in the lung. The lacZ gene inserted
into the mafF locus revealed prominent expression sites in
the gut, lung, liver, outflow tract of the heart, cartilage, bone
membrane, and skin but not in hematopoietic cells at any developmental
stage. Homozygous mafF null mutant mice were born in a
normal Mendelian ratio and displayed no obvious functional
deficiencies, indicating that MafF activity may be dispensable even in
tissues where the expression of other small Maf proteins is quite low.
Characterization of the Murine mafF Gene
,
,
, and
Department of Biochemistry, Molecular
Biology, and Cell Biology, Northwestern University, Evanston
Illinois 60208-3500 and § Institute of Basic Medical
Sciences and Center for TARA, University of Tsukuba,
1-1-1 Tennoudai, Tsukuba 305, Japan
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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