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Kawagoshi, T., Nishida, C., & Matsuda, Y. (2011). The origin and differentiation process of x and y chromosomes of the black marsh turtle (siebenrockiella crassicollis, geoemydidae, testudines). Chromosome Research, (online first). 
Added by: Admin (29 Jan 2012 12:38:52 UTC)
Resource type: Journal Article
DOI: 10.1007/s10577-011-9267-7
BibTeX citation key: Kawagoshi2011
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Categories: General
Keywords: Genetik = genetics, Geoemydidae, Pelodiscus, Pelodiscus sinensis, Schildkröten = turtles + tortoises, Siebenrockiella, Siebenrockiella crassicollis, Trionychidae
Creators: Kawagoshi, Matsuda, Nishida
Collection: Chromosome Research
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Abstract     
The black marsh turtle (Siebenrockiella crassicollis) has morphologically differentiated X and Y sex chromosomes. To elucidate the origin and evolutionary process of S. crassicollis X and Y chromosomes, we performed cross-species chromosome painting with chromosome-specific DNA from Chinese soft-shelled turtle (Pelodiscus sinensis) and chromosome mapping of the sex-linked genes of S. crassicollis using FISH. The X and Y chromosomes of S. crassicollis were hybridized with DNA probe of P. sinensis chromosome 5, which is homologous to chicken chromosome 5. S. crassicollis homologues of 14 chicken chromosome 5-linked genes were all localized to the X long arm, whereas two genes were mapped to the Y short arm and the other 12 genes were localized to the Y long arm in the same order as the X chromosome. This result suggests that extensive linkage homology has been retained between chicken chromosome 5 and S. crassicollis X and Y chromosomes and that S. crassicollis X and Y chromosomes are at an early stage of sex chromosome differentiation. Comparison of the locations of two site-specific repetitive DNA sequences on the X and Y chromosomes demonstrated that the centromere shift was the result of centromere repositioning, not of pericentric inversion.
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