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Figure 3


Fig. 3. The BX-C and untranslated RNAs. (A) Relationship between embryonic parasegments, cis-regulatory domains of the BX-C, and expression domains of Hox genes in embryos. The names of the regulatory regions are given above, and the embryonic expression domains of Hox genes are shown below. Regulatory domains set the anterior borders of the parasegments indicated but also function in posterior parasegments. (B) Molecular map of BX-C. Cis-regulatory domains are colored as in A, and Hox mRNA structure is shown (simplified for Abd-B) below. Regulatory domains marked in red are transcribed to give untranslated RNAs. (C) Detailed map of untranslated RNAs of the bxd regulatory region [after Lipshitz et al. (Lipshitz et al., 1987)]. Grey bars show additional transcripts identified recently (Sanchez-Elsner et al., 2006). The locations of the maintenance element (ME) and the transcription start site for Ubx are indicated. The bottom panel shows that Ubx (green) and bxd ncRNA (red) are expressed in different cells of the blastoderm embryo [adapted from Petruk et al. (Petruk et al., 2006)].





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