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Mol. Cell. Biol., 08 1995, 4158-4166, Vol 15, No. 8
T Sueyoshi, R Kobayashi, K Nishio, K Aida, R Moore, T Wada, H Handa and M Negishi
Expression of the Cyp 2d-9 (steroid 16 alpha-hydroxylase) gene in mouse
liver is male specific in such Mus musculus domesticus strains as FVB/N,
whereas the corresponding P450 genes in the wild mouse species Mus spretus
are not sex specific in their expression. These parental differences in the
gene expressions were independently inherited in F1 offspring from crosses
of FVB/N and M. spretus. A 5' flanking sequence (-110CTC
CTCCCTATTCCGGGCC-92) was defined as a regulatory element (named SDI-A1) for
the domestic Cyp 2d-9 promoter. The nucleotide which corresponds to T at
position -99 within SDI-A1 was found to be substituted with C in the wild
mouse P450 genes. The placing of C at position -99 abolished the
transcriptional activity of SDI-A1 in HepG2 cells as well as the binding of
SDI-A1 to a nuclear factor. This factor (designated NF2d9) was purified
from mouse nuclear extracts, and its cDNA cloned. The purified NF2d9 bound
to SDI-A1 but not to the mutated SDI-A1 with C at position -99. The deduced
amino acid sequence revealed that NF2d9 is 72 and 94% identical to mouse
CP2 and human LBP-1a, respectively. NF2d9 thus belongs to the CP2 family
and is the mouse homolog of human LBP-1a, which modulates human
immunodeficiency virus type 1 transcription. Anti-NF2d9, which was raised
against the bacterially expressed protein, supershifted the SDI-A1 complex
with the liver nuclear extract. Both the bacterially expressed and in
vitro- translated NF2d9 inhibited SDI-A1 complex formation, although they
did not bind to SDI-A1 directly. The results, therefore, indicate that the
domestic Cyp 2d-9 gene can be regulated through a specific association of
NF2d9 with SDI-A1.
A nuclear factor (NF2d9) that binds to the male-specific P450 (Cyp 2d- 9) gene in mouse liver
Pharmacogenetics Section, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709, USA.
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