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Fig. 4 | BMC Genomics

Fig. 4

From: Long-read based assembly and synteny analysis of a reference Drosophila subobscura genome reveals signatures of structural evolution driven by inversions recombination-suppression effects

Fig. 4

SyMAP comparative chromosome synteny analysis between D. subobscura (Ds; central gold horizontal bars) and each of D. melanogaster (Dm; upper grey) and D. guanche (Dg; bottom purple). Bands connecting homologous chromosomes denote noninverted (pink) and inverted (green) synteny blocks. Labeled ticks on chromosomes indicate proximal (p) and distal (d) inversion breakpoints. Labels for breakpoints in the proximal region of the A chromosome are provided in the upper right panel of the figure (h1p to h4d), along with the optimal reversal scenario for the transition between the standard sequence of D. subobscura and the arrangement of D. guanche in this region inferred using the GRIMM algorithm. The eight synteny blocks of that transition are designated by positive (noninverted) and negative (inverted) numbers, and the corresponding four intermediate hypothetical inversions (yellow) by letter “h” subscripted 1–4. Cytological map positions and pseudochromosome coordinates of inversions breakpoints are given in Additional file 21: Table S10

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