Table of Contents
Genes, Volume 9, Issue 5 (May 2018)
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Cover Story (view full-size image) The Djungarian and Campbell’s dwarf hamsters provide an interesting example of the early steps of [...] Read more. The Djungarian and Campbell’s dwarf hamsters provide an interesting example of the early steps of reproductive isolation. They diverged about one million years ago and retained almost identical karyotypes. Male hybrids are completely sterile; high frequency of X-Y asynapsis and recombination failure in the pseudoautosomal region (PAR) lead to meiotic arrest. Female hybrids are fertile, but in both hybrids and parental species, the PAR-containing heterochromatic arms of X displayed disrupted synapsis and completely suppressed recombination. The authors suggest that this suppression should result in fast accumulation of different mutations in the PARs of isolated populations of the parental species and accelerate nucleotide divergence between them. This in turn leads to high frequency of X-Y asynapsis in hybrids and male hybrid sterility. View this paper.