Nucleic Acids Research, Vol 27, Issue 3 764-770, Copyright © 1999 by Oxford University Press
JA Feledy, MI Morasso, SI Jang and TD Sargent
PCR-based methods and mobility shift competition assays were used to
determine the basic biochemical features of the homeodomain transcription
factor Distal-less 3 (Dlx3), including an optimal DNA binding site, the
binding constant and dissociation rates of this protein. Expression of Dlx3
protein in either HeLa cells or Xenopus embryos resulted in strong
activation of a model target gene construct containing three tandem copies
of the Dlx3 binding site upstream from the TATA element. In addition,
deletion analysis revealed that transcriptional activation by Dlx3 depends
on two subdomains located on either side of the homeobox: removal of either
subdomain resulted in complete loss of Dlx3 function. These observations
provide new insight regarding the function of Dlx3 in vertebrate
development and tissue differentiation and also suggest a mechanism for the
dominant inheritance pattern of a hereditary disease resulting from
mutation of the DLX3 gene in human.
ARTICLES
Transcriptional activation by the homeodomain protein distal-less 3
Laboratory of Molecular Genetics, NICHD and Laboratory of Skin Biology, NIAMS, National Institutes of Health, Bethesda, MD 20892, USA.
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