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Supplementary Material for: Karyotype Evolution and Phylogenetic Relationships of Cricetulus sokolovi Orlov et Malygin 1988 (Cricetidae, Rodentia) Inferred from Chromosomal Painting and Molecular Data
<p>Sokolov's dwarf hamster (<i>Cricetulus sokolovi</i>) is the least studied representative of the striped hamsters (<i>Cricetulus barabensis</i>
species group), the taxonomy of which remains controversial. The
species was described based on chromosome morphology, but neither the
details of the karyotype nor the phylogenetic relationships with other <i>Cricetulus</i> are known. In the present study, the karyotype of <i>C. sokolovi</i>
was examined using cross-species chromosome painting. Molecular and
cytogenetic data were employed to determine the phylogenetic position of
Sokolov's hamster and to analyze the potential pathways of chromosome
evolution in <i>Cricetulus</i>. Both the chromosome and molecular data support the species status of Sokolov's hamster. Phylogenetic analysis of the <i>CYTB</i> data placed <i>C. sokolovi</i> as sister to all other striped hamsters (sequence divergence of 8.1%). FISH data revealed that the karyotype of <i>C. sokolovi</i>
is highly rearranged, with the most parsimonious scenario of its origin
implying at least 4 robertsonian events and a centromere shift.
Comparative cytogenetic data on Cricetinae suggest that their
evolutionary history includes both periods of chromosomal conservatism
and episodes of rapid chromosomal change.</p