Abstract
Classical satellites I, II and III are composed of a mixture of repeated sequences. However, each of them contains a simple family of repeated sequences as a major component. Satellites 2 and 3 are simple families of repeated sequences that form the bulk of human classical satellites II and III, respectively, and are composed of closely related sequences based on tandem repeats of the pentamer ATTCC. For this reason, extensive cross-hybridizations are probably responsible for the similar in situ hybridization patterns obtained for satellites II and III. We have used a fluorescent in situ hybridization method with highly specific oligonucleotides for satellites 2 and 3, respectively, as probes. Our results show that satellite 2 is mainly located on chromosomes 1, 2, 10 and 16, whereas the major domain of satellite 3 is on chromosome 9. Furthermore, minor sites of satellites 2 and 3 are shown. Two-colour in situ hybridizations have enabled us to define the spatial relationships existing between the major domains of both satellites and centromeric alpha satellite sequences. These experiments indicate that the heterochromatin regions of chromosomes 1, 9 and 16 have different molecular organizations.
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Tagarro, I., Fernández-Peralta, A.M. & González-Aguilera, J.J. Chromosomal localization of human satellites 2 and 3 by a FISH method using oligonucleotides as probes. Hum Genet 93, 383–388 (1994). https://doi.org/10.1007/BF00201662
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DOI: https://doi.org/10.1007/BF00201662