Fig. 3: Indication of the ongoing accumulation of ERVK solo-LTRs.
From: Adaptive expansion of ERVK solo-LTRs is associated with Passeriformes speciation events
a Shared ERVK solo-LTRs constitute a large portion of all ERVK solo-LTRs in 41 Passerida bird species among 143 Passeri bird species. b Heatmap of the RNA expression levels of ERVK retroviral genes (n = 120) among three reproductive tissues and four other tissues. We applied a log10(count + 1) transformation to the normalized count for visualization. The black and gray cubes indicate significantly different levels of RNA expression between the ovary, testis, or primordial germ cells (PGC) in comparison with other organs (thresholds: log2 (fold change) > = 1 with Benjamini-Hochberg adjusted p-value < 0.05). c Upset plot illustrating the polymorphic status of ERVK solo-LTRs shared among the zebra finch population (n = 19). The top bars indicate the number of shared ERVK solo-LTRs, which are two or higher. Silhouettes of the testis, ovary, blood and brain are modified from the images by brgfx on www.freepik.com. Source data are provided as a Source Data file.
