The selective digestion of polytene and mitotic chromosomes of Drosophila melanogaster by the Alu I and Hae III restriction endonucleases |
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Authors: | R Mezzanotte |
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Institution: | (1) Istituto di Biologia Generale, Facoltà di Medicina e Chirurgia, Università, Via Ospedale 119, I-09100 Cagliari, Italy |
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Abstract: | Polytene and mitotic chromosomes of Drosophila melanogaster were treated with either Alu I or Hae III restriction endonucleases. Subsequent staining with the DNA-specific fluorochrome ethidium bromide showed that these enzymes are capable of selectively digesting chromosomal DNA in fixed cytological preparations, as previously shown in mammalian metaphase chromosomes. Alu I or Hae III digestion made possible the localization in situ of some highly repetitive DNAs in both polytene and mitotic chromosomes, while only Alu I permitted the localization of the 5S RNA genes on the polytene chromosomes of D. melanogaster. |
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