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Fig. 3. Dlx2a can bind and activate transcription through the intergenic I12b
enhancer. (A) In a transient transfection assay, zebrafish Dlx2a
upregulates transcription of a CAT reporter construct containing the I12b
enhancer (mI12b-pBLCAT2) by a factor of 11. By comparison, expression of a CAT
reporter gene under control of the I56i enhancer
(Zerucha et al., 2000) was
activated 5.6-fold in the presence of Dlx2a. (B) The disruption of the
Dlx2a homeodomain completely abolishes this activation. In the presence of
zebrafish Dlx2a, a 9.03-fold increase in CAT activity was observed, whereas
the Dlx2a homeodomain mutant showed only a basal level of CAT activity. Values
shown represent the mean of relative CAT activity obtained from two to three
independent experiments ± s.e.m.