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Evolutionary rearrangements of X chromosomes in voles (Arvicolinae, Rodentia)
Svetlana A Romanenko1, Yulia E Fedorova2,3, Natalya A Serdyukova2
1Institute of Molecular and Cellular Biology, SB RAS, Novosibirsk, Russia. rosa@mcb.nsc.ru.
Abstract:
Euchromatic segments of the X chromosomes of placental mammals are the most conservative elements of the karyotype, only rarely subjected to either inter- or intrachromosomal rearrangements. Here, using microdissection-derived set of region-specific probes of Terricola savii we detailed the evolutionary rearrangements found in X chromosomes in 20 vole species (Arvicolinae, Rodentia). We show that the evolution of X chromosomes in this taxon was accompanied by multiple para- and pericentric inversions and centromere shifts. The contribution of intrachromosomal rearrangements to the karyotype evolution of Arvicolinae species was approximately equivalent in both the separate autosomal conserved segments and the X chromosomes. Intrachromosmal rearrangements and structural reorganization of the X chromosomes was likely accompanied by an accumulation, distribution, and evolution of repeated sequences.
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