Ellobius lutescens: Sex Determination and Sex Chromosome

@article{Just2007EllobiusLS,
  title={Ellobius lutescens: Sex Determination and Sex Chromosome},
  author={Walter Just and Annette Baumstark and A. S{\"u}ss and Alexander S. Graphodatsky and Willem Rens and N. Sch{\"a}fer and Irina Bakloushinskaya and H. Hameister and Walther Vogel},
  journal={Sexual Development},
  year={2007},
  volume={1},
  pages={211 - 221}
}
The mole vole Ellobius lutescens is an interesting animal, not only concerning its sex determination mechanism without the Y-chromosomal Sry gene, that triggers sex determination in nearly all other mammalian species, but also regarding the karyotype with an odd number of chromosomes, being identical in male and female animals. The odd chromosome represents the X chromosome, and therefore, even males do not have a Y chromosome. We present an overview of a search for candidate genes of male sex… 
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It appears that the X chromosome is of the standard (‘ original’) type found in most mammals, and there is no evidence of a Y chromosome, either in the soma or in the germline.

The sex determination in Ellobius lutescens remains bizarre

This report provides key data on the genomic level that there are no coarse differences in the genomes of male and female animals by comparative genomic hybridization and provides evidence by linkage analysis in two E. lutescens pedigrees that Nr5a1 is not the key male sex-determining gene in Ellobius lutecens.

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The karyotype of the microtine Ellobius lutescens Th., was analysed using the G and Q banding techniques. One of the chromsomes of the first pair has the same bands in both sexes while the other…

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