Cytogenetic Analyses of Chromosomal Rearrangements in Mus minutoides/musculoides From North-West Zambia Through Mapping of the Telomeric Sequence (TTAGGG)n and Banding Techniques

Chromosome Res. 2002;10(5):399-406. doi: 10.1023/a:1016853719616.

Abstract

Three specimens of M. minutoides/musculoides from Zambia were cytogenetically studied through G- and C-banding, DAPI staining and fluorescence in-situ hybridization (FISH) with a (TTAGGG)n telomeric sequence. Biarmed chromosomes were identified according to the current nomenclature as follows: Rb(2.7), Rb(3.12), Rb(4.5), Rb(6.8), Rb(9.16), and the sex chromosomes Rb(1.X), Rb(1.Y) and Rb(1.Xd), originated from the deleted X chromosome. One female showed the diploid number 2n = 24; in the two other individuals, the Rb(9.16) occurred in a heteromorphic condition, and, accordingly, the diploid number was 2n = 25. FISH showed the sites of telomeric sequences at telomeres of all the chromosomes, and in an interstitial position at the centromeres of all Robertsonian metacentrics, except one - the Rb(6.8), though the patterns of hybridization varied between chromosomes. Sex chromosome pairs, in the male and females, showed a similar C-banding pattern, but revealed clear differences after FISH. Traces of telomeric sequences were found dispersed in the whole-heterochromatic arm of the Rb(1.Xd). No visible bond between C-positive heterochromatin and telomeric sequences were detected in the other either bi- or uniarmed chromosomes, indicating that they may actually represent retained telomeres in the Robertsonian metacentrics.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Chromosome Aberrations*
  • Chromosome Banding / methods*
  • DNA Probes
  • In Situ Hybridization, Fluorescence
  • Indoles
  • Mice / genetics*
  • Sex Chromosomes*
  • Telomere / genetics*
  • Zambia

Substances

  • DNA Probes
  • Indoles
  • DAPI