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Fig. 9 | BMC Biology

Fig. 9

From: The house spider genome reveals an ancient whole-genome duplication during arachnid evolution

Fig. 9

Expression of Hox paralogs in P. tepidariorum. a Summary of Hox gene expression domains and expression timing in P. tepidariorum embryos. Columns represent segments from anterior to posterior. Bars represent the extent of a gene’s expression domain with respect to the segments. The darkest color for each gene is used for the initial expression domain of each gene when it first appears, which usually coincides with a genes’ strongest expression. The next lighter color is used for the expanded domain, and the lightest color is used for further late expansions of the expression domains, which usually tends to be only in the nervous system. The stage at which a gene’s expression first appears is depicted by the stage number in the domain of first expression. ftz, in addition to its Hox domain, is expressed dynamically (i.e., budding off stripes) in the SAZ, and AbdB-B is continuously expressed in the SAZ after its formation at stage 6. These SAZ expression patterns are indicated by rectangular outlines in what is otherwise the O12 segment. Note that, since we did not detect clear expression boundaries for Hox3-A, the expression of this gene is not represented. bm Two examples of Hox gene expression differences between paralogs of Scr (bg) and AbdB (hm). For detailed descriptions of expression patterns, see Additional file 44: Supplementary File 1 and the legends of Additional file 33: Figure S17, Additional file 34: Figure S18, Additional file 42: Figure S26, Additional file 43: Figure S27. All images are overlays of a bright-field images depicting the expression pattern and a fluorescent DAPI nuclear staining. Abbreviations: Ch cheliceral segment, Pp Pedipalpal segment, L–L4 walking leg segments 1–4, O1–12 opisthosomal segments 1–12

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