Figure 1. Chromosome evolution in Xenopus a. Comparative cytogenetic map of XLA and XTR chromosomes. Magenta lines show relationships of chromosomal locations of 198 homeologous gene pairs between XLAL and S chromosomes, identified by FISH mapping using BAC clones (Supplemental Table 1, see Supplementary Note 3.1). Blue lines show relationships of chromosomal locations of orthologous genes between XTR chromosomes and (i) both XLA L and S chromosomes (solid line) (lines between XLAL and S are omitted), (ii) only XLAL (dashed), or (iii) only XLAS (dotted), which were taken from our previous studies14,15. Light blue lines indicate positional relationships of actr3 and lypd1 on XTR9q and rpl13a and rps11 on XTR10q with those on XLA9_10LS chromosomes (see Supplementary Note 6.2). Double-headed arrows on the right of XLAS chromosomes indicate the chromosomal regions in which inversions occurred. Ideograms of XTR and XLA chromosomes were taken from our previous reports15,16.b. Distribution of homeologous genes (purple), singletons (grey), and subgenome-specific repeats across XLA1L (top) and XLA1S (bottom). Xl-TpL_Harb is red, Xl-TpS_Harb is blue, and Xl-TpS_Mar is green. Purple lines mark homeologous genes present in both L and S chromosomes, the black line marks the approximate centromere location on each chromosome. The homeologous gene pairs, from left to right: rnf4, spcs3, intsl2, foxa1, sds, ap3s1, lifr, aqp7. Each bin is 3 MB in size, with 0.5 MB overlap with the previous bin.c. Chromosomal localization of the Xl-TpS_Mar sequence. Hybridization signals were only observed on the S chromosomes. Scale bar shows 10 μm.
Image published in: Session AM et al. (2016)
Image downloaded from an Open Access article in PubMed Central. Image reproduced on Xenbase with permission of the publisher and the copyright holder.
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