Figure 6 : Example graphs comparing DNA sequences from cultivated peanut with chromosomal pseudomolecules of A. duranensis and A. ipaensis.

From: The genome sequences of Arachis duranensis and Arachis ipaensis, the diploid ancestors of cultivated peanut

Figure 6

(a,b) Graphs show mapping of Moleculo DNA sequence reads from the tetraploid A. hypogaea cv. Tifrunner along the diploid chromosomal pseudomolecules Aradu.A05 (a) and Araip.B05 (b). Dark blue dots represent percentage identity of reads in tiling paths, and red dots represent density of Moleculo bases mapping in windows of 0.5 Mb (normalized to a value of 1 for the expected number). Note how the percentage identities of mapped reads for Aradu.A05 are, contrary to expectation, more consistent in the pericentromeric regions than in distal ones. This may reflect that sequence similarity between A. duranensis and the A subgenome of A. hypogaea has been eroded by recombination between the A and B subgenomes in the tetraploid by, for example, gene conversion. In contrast, mapping on Araip.B05 is much more consistent and generally very high identity, except for the upper distal 6.1 Mb, where identities fall dramatically (blue arrow). Also note how deviations in expected mapping density (indicated by red arrows) show that this region, in the tetraploid genome of A. hypogaea cv. Tifrunner, has undergone tetrasomic recombination and has changed from the expected genome formula of AABB to AAAA.