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Fig. 5 | BMC Evolutionary Biology

Fig. 5

From: Evolutionary origin of type IV classical cadherins in arthropods

Fig. 5

Schematic representation of conserved intron positions among classical cadherin genes. Colored rectangles indicate protein-coding regions of the transcripts of the Pt1- and Pt2-cadherin (light blue), non-spider arthropod classical cadherin (pink), and non-arthropod classical cadherin (green) genes. The classical cadherin genes shown are as follows: DE-cadherin (DE, fruit fly); Tc1-cadherin (Tc1, beetle); Am1-cadherin (Am1, honey bee); Ap1-cadherin (Ap1, aphid); Dp1-cadherin (Dp1, water flea); Le1-cadherin (Le1, sea slater); Sm1-cadherin (Sm1, centipede); Sm2-cadherin (Sm2, centipede); Cm-cadherin (Cm, shrimp); Le2-cadherin (Le2, sea slater); Dp2-cadherin (Dp2, water flea); Am2-cadherin (Am2, honey bee); DN-cadherin (DN, fruit fly); Pt1-cadherin (Pt1, spider); Pt2-cadherin (Pt2, spider); Ct-cadherin (Ct, polychaete); Lg-cadherin (Lg, snail); LvG-cadherin (LvG, sea urchin); Bf-cadherin (Bf, amphioxus); Pn-cadherin (Pn, fish); and Mm5-cadherin (Mm5, mouse). Regions of the transcripts for which genomic sequences were not available are indicated by slanted stripes. A schematic illustration exhibiting the domain structure of Pt1-cadherin is placed at the top as a positional reference. All identified intron insertion sites are shown, and the exons are tentatively numbered from the 5′-terminal side of each transcript. Conserved intron positions that were identified based on the alignment of the amino acid sequences (Additional file 10: Figure S8) are represented by colored vertical lines. The yellow lines indicate arthropod-specific intron positions, whereas the green lines indicate conserved intron positions between the Pt1- and Pt2-cadherin genes and some of the non-arthropod bilaterian classical cadherin genes but not among any other arthropod genes. The red lines indicate intron positions that are conserved both between the Pt1- and Pt2-cadherin genes and some of the other arthropod genes and between the spider genes and some of the non-arthropod bilaterian genes. The blue lines indicate conserved intron positions between some of the non-spider arthropod type III cadherin genes and some of the type IV cadherin genes, and the purple lines show the conservation of intron positions within the non-arthropods

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