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Dynamics of Sau3A in situ digestion of human chromosomes analyzed with computerized imaging.

The differential DNA removal obtained after in situ digestion of human metaphase chromosomes with the restriction endonuclease Sau3A was analyzed on complete and partially digested nuclei using computerized imaging. The results obtained permit the discrimination of Sau3A-resistant chromosome regions (pericentromeric constitutive heterochromatin on chromosomes 3 and 9) from those partially digested (Yq12 and pericentromeric heterochromatin on other chromosomes), according to the digestion dynamics deduced from the grey intensity profile along each chromosome. This approach permits an accurate labelling of chromosome markers for the identification of genomes from different individuals. This is of special interest for the analysis of the chimeric status found in patients after allogenic bone marrow transplantation.