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Various organizations of the complex repeats in vole sex chromosome heterochromatin

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Abstract

Different patterns of the DNA sequences organization were revealed in the vole (Rodentia) sex chromosome heterochromatin using dual-label fluorescence in-situ hybridization on extended DNA fibers with different repetitive DNA sequences as probes. In Microtus rossiaemeridionalis, the basic type represents the homogeneous relatively short tracks consisting of tandemly reiterated monomers of the MS3 family alternating with similar tracks of MS4 monomers and with non-fluorescent spacers. These tracks varied in the length of both repeats, with an average size of 12–22 kb or 3–5 copies. Apart from this, some continuous tracks of both families spanning 100–200 kb were interrupted by short spacers or single signals from the sequences with homology to LINEs. These results, together with that obtained by the analysis of phage clones of the genomic library, unequivocally demonstrate a variable large-scale DNA structural organization in heterochromatin of the M. rossiaemeridionalis sex chromosome. The dominant type of large-scale DNA organization in M. transcaspicus heterochromatin represents the unicolor relatively long tracks consisting of monotonous but not alternating monomers of MS3 or MS4 with sizes ranging from 15 to 40 kb and separated by extended spacers with an average length of 20 kb. Thus, the formation of the vole sex chromosome heterochromatic regions occurred relatively recently during speciation.

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Authors and Affiliations

  1. Russian Academy of Sciences, Siberian Department, Pr. ac. Lavrentieva, Institute of Cytology and Genetics, 10, Novosibirsk, 630090, Russia

    Svetlana V. Kozlova, Nina A. Mazurok, Alexander V. Vershinin & Suren M. Zakian

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  1. Svetlana V. Kozlova
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  2. Nina A. Mazurok
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  3. Alexander V. Vershinin
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  4. Suren M. Zakian
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Correspondence to Suren M. Zakian.

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Kozlova, S.V., Mazurok, N.A., Vershinin, A.V. et al. Various organizations of the complex repeats in vole sex chromosome heterochromatin. Chromosome Res 11, 759–769 (2003). https://doi.org/10.1023/B:CHRO.0000005779.10547.06

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  • DOI: https://doi.org/10.1023/B:CHRO.0000005779.10547.06

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