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J Biol Chem, Vol. 274, Issue 5, 2665-2671, January 29, 1999
OC-2, a Novel Mammalian Member of the ONECUT Class of Homeodomain
Transcription Factors Whose Function in Liver Partially Overlaps with
That of Hepatocyte Nuclear Factor-6
Patrick
Jacquemin,
Vincent J.
Lannoy,
Guy G.
Rousseau, and
Frédéric P.
Lemaigre
From the Hormone and Metabolic Research Unit, Louvain University
Medical School and the Christian de Duve Institute of Cellular
Pathology, Avenue Hippocrate 75, B-1200 Brussels, Belgium
Transcription factors of the ONECUT class, whose
prototype is hepatocyte nuclear factor (HNF)-6, are characterized by
the presence of a single cut domain and by a peculiar homeodomain (Lannoy, V. J., Bürglin, T. R., Rousseau, G. G.,
and Lemaigre, F. P. (1998) J. Biol. Chem. 273, 13552-13562). We report here the identification and characterization
of human OC-2, the second mammalian member of this class. The
OC-2 gene is located on human chromosome 18. The
distribution of OC-2 mRNA in humans is
tissue-restricted, the strongest expression being detected in the liver
and skin. The amino acid sequence of OC-2 contains several regions of
high similarity to HNF-6. The recognition properties of OC-2 for
binding sites present in regulatory regions of
liver-expressed genes differ from, but overlap with, those of HNF-6.
Like HNF-6, OC-2 stimulates transcription of the hnf-3
gene in transient transfection experiments, suggesting that OC-2
participates in the network of transcription factors required for liver
differentiation and metabolism.
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 1999 by the American Society for Biochemistry and Molecular Biology.
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