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letter
. 2010 Feb;20(2):212–227. doi: 10.1101/gr.095406.109

Figure 7.

Figure 7.

Simulation results indicate that reducing recombination rates of piRNA loci can greatly reduce the number of retrotransposons carried in the genome. Under scenario III, the piRNAs can repress the activities of targetRTs to 1% of their original level, and piRTs have the same recombination rates as targetRTs; under scenario V, the same parameter settings were used as under scenario III except that there was no recombination on the piRTs so that piRTs do not contribute to the fitness cost of retrotransposons because they do not retrotranspose or get involved into ectopic recombination. At equilibrium, the mean number of retrotransposons carried on one chromosome is approximately six under scenario III, while it is fewer than two under scenario V (Ne = 1000, a = 0.001, b = 0.0005, r = 2.5 × 10−8, u1 = 0.01, u2 = 0.0001, and v = 0, after scaling for both scenarios III and V).