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Molecular and Cellular Biology, September 1998, p. 5099-5108, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Brachyury-Related Transcription Factor Tbx2 and
Repression of the Melanocyte-Specific TRP-1 Promoter
S.
Carreira,
T. J.
Dexter,
U.
Yavuzer,
D.
J.
Easty,§ and
C. R.
Goding*
Eukaryotic Transcription Laboratory, Marie
Curie Research Institute, Oxted, Surrey RH8 0TL, United Kingdom
Received 13 March 1998/Returned for modification 5 May
1998/Accepted 16 June 1998
Previous work has demonstrated that two key melanocyte-specific
elements termed the MSEu and MSEi play critical roles in the expression
of the melanocyte-specific tyrosinase-related protein 1 (TRP-1)
promoter. Both the MSEu and MSEi, located at position
237 and at the
initiator, respectively, bind a melanocyte-specific factor termed MSF
but are also recognized by a previously uncharacterized repressor,
since mutations affecting either of these elements result in strong
up-regulation of TRP-1 promoter activity in melanoma cells. Here we
demonstrate that repression mediated by the MSEu and MSEi also operates
in melanocytes. We also report that both the MSEu and MSEi are
recognized by the brachyury-related transcription factor Tbx2, a member
of the recently described T-box family, and that Tbx2 is expressed in
melanocyte and melanoblast cell lines but not in melanoblast precursor
cells. Although Tbx2 and MSF each recognize the TRP-1 MSEu and MSEi
motifs, it is binding by Tbx-2, not binding by MSF, that correlates
with repression. Several lines of evidence tend to point to the
brachyury-related transcription factor Tbx2 as being the repressor of
TRP-1 expression: both the MSEu and MSEi bind Tbx2, and mutations in
either element that result in derepression of the TRP-1 promoter
diminish binding by Tbx2; the TRP-1 promoter, but not the tyrosinase,
microphthalmia, or glyceraldehyde-3-phosphate dehydrogenase (G3PDH)
promoter, is repressed by Tbx2 in cotransfection assays; a
high-affinity consensus brachyury/Tbx2-binding site is able to
constitutively repress expression of the heterologous IE110 promoter;
and a low-affinity brachyury/Tbx2 binding site is able to mediate
Tbx2-dependent repression of the G3PDH promoter. Although we cannot
rule out the presence of an additional, as yet unidentified factor
playing a role in the negative regulation of TRP-1 in vivo, the
evidence presented here suggests that Tbx2 most likely is the
previously unidentified repressor of TRP-1 expression and as such is
likely to represent the first example of transcriptional repression by a T-box family member.
*
Corresponding author. Mailing address: Eukaryotic
Transcription Laboratory, Marie Curie Research Institute, The Chart,
Oxted, Surrey RH8 0TL, United Kingdom. Phone: (44) 1883 722306. Fax: (44) 1883 714375. E-mail: c.goding{at}mcri.ac.uk.

Present address: National Institute for Medical Research, London
NW7 1AA, United Kingdom.

Present address: Molecular Biology Department, Bilkent University,
06533 Bilkent, Ankara, Turkey.
§
Present address: Department of Pathology, University College
Dublin, Dublin, Ireland.
Molecular and Cellular Biology, September 1998, p. 5099-5108, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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