Skip to main content
. 2020 Oct 28;11(11):1267. doi: 10.3390/genes11111267

Figure 1.

Figure 1

A transposition from the Z to W chromosomes in birds-of-paradise. (a) the genomic region at ~60 Mb of the Z chromosome showing doubled female sequencing coverage and female-specific elevations of heterozygosities (“f/m SNP density”) was inferred as a recent Z-transposed region (ZTR), and is marked by a red vertical bar. Two genes that survived following ZTR were labeled close to the red vertical bar. PAR and Z-linked duplications (marked in gray and purple vertical bars) are not expected to show a female-specific elevation of SNP densities. (b) A zoom-in view of the ZTR, showing female coverage and female-to-male SNP density calculated in 50 kb windows. (c) The phylogeny of birds-of-paradise (BOP) showing the origin of the ZTR (red asterisk) and the Z-linked duplication (blue asterisk). ReB: red BOP, RaB: Raggiana BOP, Mab: magnificent BOP, AmC: American crow, CoF: collared flycatcher. All bird illustrations were ordered from https://www.hbw.com/. (d) The 1.3 Mb transposed sequence (vertically aligned with (B)) contains 8 genes, but 4 complete and 2 partial genes have been deleted due to a 583 kb long deletion. Only ANXA1 and ALDH1A1 were retained on the W after transposition. (e) A zoom-in view for the duplication that does not show elevated female-to-male SNP density and both female and male coverage are doubled.