Fig. 5

Gene and Helitron distribution of nine Brassicaceae genomes. First row is chromosome, middle row is gene distribution, and last row is Helitron distribution. (a) Ath, (b) Aly, (c) Cru, (d) Tpa (lack of GTF), (e) Bra, (f) Bol v1, (g) Bol v2, (h) Bna, (i) Csa. Most of Brassicaceae Helitrons prefer to locate around centromeres and lack gene region. Sliding window analysis (window = 1 Mbp, step = 500 kbp) and correlation analysis show that, most of these genomes, gene densities are high negatively related with Helitron density (−0.707 < r < −0.315, p < 0.001, Table S8, Additional file 2)