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Fig. 2. Isolation of a minimum enhancer recapitulating Ci-sFRP1/5
expression. (A) Ci-sFRP1/5 locus in the Ciona
intestinalis genome, showing the 5' flanking region and the first
two exons. Coding/non coding conserved regions between C.
intestinalis and C. savignyi are shown in white/pink. The scheme
shows the position of the distal sFRP-1067 and proximal fragments tested in
vivo. (B) Schematic view of the regulatory elements (with their length
in brackets) tested at the 110-cell stage. With the exception of sFRP-1067,
which includes the endogenous minimal promoter, all constructs were placed in
front of the Cibrachyury minimal promoter. (a-c) Representative X-gal
staining for embryos electroporated with the indicated DNA (percentages
correspond to embryos electroporated with sFRP-640, sFRP-95 and sFRP-67
respectively). (a,c) Animal view, anterior towards the top. (b) Anterior view,
animal to the top. (C) Alignment of the C. intestinalis and
C. savignyi sequences of the sFRP-118 element, with putative Fox
binding sites framed in red.