Fig. 1: Solo-LTRs in bird genomes display different patterns from those of mammals and reptiles.
From: Adaptive expansion of ERVK solo-LTRs is associated with Passeriformes speciation events
a Phylogenetic tree with the proportion of solo-LTRs (the inner circle) and the ratio of solo-LTR (outer circle) in birds (n = 362), reptiles (n = 23), and mammals (n = 20). The inner circle represents the proportion of solo-LTRs relative to the genome size. The outer circle represents the ratio of solo-LTRs to total LTRs length, indicating the frequency of solo-LTRs formation. Taxonomic information follows classifications in Howard and Moore83. b Solo-LTRs counts were positively correlated with genome size in mammals (n = 20) and reptiles (n = 22), but not in birds (n = 345). Bird and reptile species with potentially problematic assemblies (genome size < 800 Mb or scaffold N50 < 20 kb) were filtered to reduce the bias of assembly quality. Dots correspond to individual species, with red dots indicating bird species, purple dots indicating reptile species, and blue dots indicating mammal species. Correlation analysis was performed by using Pearson correlation at 95% confidence interval, and colored regions indicate the 95% confidence interval for each regression line. Source data are provided as a Source Data file.
