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Longitudinal differentiation of metaphase chromosomes of Indian muntjac as studied by restriction enzyme digestion, in situ hybridization with cloned DNA probes and distamycin A plus DAPI fluorescence staining

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Abstract

The longitudinal differentiation of metaphase chromosomes of the Indian muntjac was studied by digestion with restriction enzymes, in situ hybridization with cloned DNA probes and distamycin A plus DAPI (4′-6-diamidino-2-phenylindole) fluorescence staining. The centromeric regions of chromosomes 3 and 3 + X of a male Indian muntjac cell line were distinct from each other and different from those of other chromosomes. Digestion with a combination of EcoRI* and Sau3A revealed a pattern corresponding to that of C-banding. Digestion with AluI, EcoRII or RsaI yielded a band specific to the centromeric region only in chromosomes 3 and 3 + X. Furthermore, HinfI digestion yielded only a band at the centromeric region of chromosome 3, whereas DA-DAPI staining revealed a single band limited to the extreme end of the C-band heterochromatin of the short arm of 3 + X. These results suggest that centromeres of Indian muntjac chromosomes contain at least four different types of repetitive DNA. Such diversity in heterochromatin was also confirmed by in situ hybridization using specific DNA probes isolated and cloned from highly repetitive DNA families. Heterozygosity between chromosome homologs was revealed by restriction enzyme banding. Evidence is presented for the presence of nucleolus organizer regions (NORs) on the long arm of chromosome 1 as well as on the secondary constrictions of 3 and 3 + X.

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Abbreviations

DA :

distamycin A

DAPI :

4′-6-diamidino-2-phenylindole

NOR(s) :

nucleolus organizer region(s)

PBS :

phosphate-buffered saline

PI :

propidium iodide

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Ueda, T., Irie, S. & Kato, Y. Longitudinal differentiation of metaphase chromosomes of Indian muntjac as studied by restriction enzyme digestion, in situ hybridization with cloned DNA probes and distamycin A plus DAPI fluorescence staining. Chromosoma 95, 251–257 (1987). https://doi.org/10.1007/BF00294781

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