Abstract
It is demonstrated that either general staining of the centromeric regions of all primate chromosomes, or selective staining of the centromeric region of specific chromosomes, may be obtained in preparations of metaphase chromosomes by probing specifically for different regions within the alpha satellite DNA monomer. In order to exploit observed patterns of sequence variation within the monomer for this purpose, we have developed two new DNA analysis methods. In PRimed IN Situ labelling (PRINS), synthetic oligonucleotides derived from subsections of the monomer are hybridized to the chromosomes. The oligonucleotides then serve as primers for the in situ incorporation of biotin-labelled nucleotides catalysed by Klenow polymerase. Incorporated biotin is visualized with fluorescein isothiocyanate-labelled avidin (FITC-avidin). In Primed Amplification Labelling (PAL), biotin-labelled hybridization probes are produced in a polymerase chain reaction (PCR, Saiki et al. 1985), in which two synthetic oligonucleotide primers anneal within the same monomer. With the right choice of primers libraries of labelled probes derived from most monomers present as templates are produced. If DNA from a specific chromosome is used as template, then the resulting probe mixture gives stronger and more chromosome-specific signals in in situ hybridization experiments than does a cloned alpha satellite DNA probe derived from the same chromosome. The results obtained indicate that the alpha-repeat monomer is composed of regions with different degrees of chromosome specificity.
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Koch, J.E., Kølvraa, S., Petersen, K.B. et al. Oligonucleotide-priming methods for the chromosome-specific labelling of alpha satellite DNA in situ. Chromosoma 98, 259–265 (1989). https://doi.org/10.1007/BF00327311
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DOI: https://doi.org/10.1007/BF00327311