Intraspecific variation in the distribution of the interstitial telomeric (TTAGGG)n sequences in Micoureus demerarae (Marsupialia: Didelphidae)

The distribution of the telomeric sequence (TTAGGG)n was studied in chromosomes of Micoureus demerarae (2n = 14), a South American marsupial, by fluorescence in-situ hybridization (FISH). The telomeric repeat sequence was present at both ends of all chromosomes, but also various interstitial telomer...

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Bibliographic Details
Published in:Chromosome research 2000, Vol.8 (7), p.585-591
Main Authors: Pagnozzi, J M, De Jesus Silva, M J, Yonenaga-Yassuda, Y
Format: Article
Language:English
Subjects:
Animals
Chromosome Banding
Chromosome Painting
Didelphidae
Female
Genetic Variation
In Situ Hybridization, Fluorescence
Karyotyping
Male
Marsupialia
Marsupialia - genetics
Micoureus demerarae
Repetitive Sequences, Nucleic Acid
Satellite DNA
Telomere
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Summary:The distribution of the telomeric sequence (TTAGGG)n was studied in chromosomes of Micoureus demerarae (2n = 14), a South American marsupial, by fluorescence in-situ hybridization (FISH). The telomeric repeat sequence was present at both ends of all chromosomes, but also various interstitial telomeric sequences (ITS) were detected in the pericentromeric heterochromatic regions. Intraspecific differences in the number of ITS (2 to 8) were observed without intraindividual variation. The presence of telomere-like sequences in the same regions of constitutive heterochromatin suggest that these segments are not necessarily remnants of true telomeres resulting from chromosome rearrangements but could be part of the satellite DNA.
ISSN:0967-3849
1573-6849
DOI:10.1023/a:1009229806649