Abstract
The Western European house mouse is chromosomally diverse, with diploid karyotypes ranging from the standard 40 telocentric chromosomes down to 22 chromosomes. Karyotypes are modified through Robertsonian (Rb) fusion of 2 telocentrics into a single metacentric, occurring repeatedly with fixation, and whole-arm reciprocal translocations (WARTs) generating additional novel karyotypes. Over 100 metacentric populations (chromosomal races) have been identified, geographically clustered into “systems.” Chromosomal races within systems often hybridise, and new races may emerge through this hybridisation (“zonal raciation”). We wished to determine the degree to which chromosomal races in a system have evolved independently or share common ancestry. Recombination between chromosomes from hybridising chromosomal races can erase the signals associated with a particular metacentric of interest, making inferences challenging. However, reduced recombination near the centromeres of chromosomal race-specific metacentrics makes centromere-adjacent markers ideal for solving this problem. For the Northern Italy System (NIS), we used microsatellite markers near the centromere to test previous hypotheses about evolutionary relationships of 5 chromosomal races. We chose markers from chromosomes 1, 3, 4, and 6, all of which comprise one arm of a metacentric in at least 2 of these NIS metacentric populations. We used estimates of FST and RST, as well as principal components analyses and neighbour-joining phylogenetic analyses, to infer evolutionary relationships between these 5 chromosomal races and neighbouring mice with the standard karyotype. We showed that the metacentric populations form a single grouping distinct from the standard populations, consistent with their common origin and consistent with a parsimonious sequence of chromosomal rearrangements to explain the relationship of the chromosomal races. That origin and evolution of the chromosomal races in the system would have involved Rb fusions, explaining the occurrence of chromosomal races with diploid numbers as low as 22. However, WARTs and zonal raciation have also been inferred, and the rare occurrence of chromosome 1 in different metacentrics in closely related chromosomal races is almost certainly explained by a WART. Our results with centromeric microsatellites are consistent with the above scenarios, illustrating, once again, the value of markers in the centromeric region to test evolutionary hypotheses in house mouse chromosomal systems.
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