Abstract
The distribution of Z-form DNA along the length of metaphase chromosomes of Indian muntjac was studied by indirect immunofluorescence procedures using an antibody specific to the Z-DNA conformation. Several fixation conditions were compared for reproducible detection of Z-DNA in isolated metaphase chromosomes. Fixation of chromosomes with 45% acetic acid alone gave reproducible reactivity with the antibody. When fixation was done either with Carnoy's solution (3:1 methanol:acetic acid) or with 75% alcohol alone, the antibody binding was at background level. Acetic acid-fixed chromosomes exhibited intense fluorescence both at C-band heterochromatin and at nucleolus organizer regions (NORs). The euchromatic regions had weakly, but clearly, stained bands, which were quite similar to the chromomycin A3 R-bands. After treatment with topoisomerase I, the immunofluorescence at NORs and R-bands disappeared, but only a slight decrease in immunofluorescence intensity was observed at C-band regions. We suggest that this difference in the immunoreactivity of NORs and R-bands from C-bands reflects a difference in gene activity among these regions. Possible molecular mechanisms involved in Z-DNA immunoreactivity are discussed, based on SDS-polyacrylamide gel electrophoretic analysis of chromosomal proteins after extraction of metaphase chromosomes with different fixative solutions.
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Abbreviations
- PI :
-
propidium iodide
- NOR(s) :
-
nucleolus organizer region(s)
- SDS-PAGE :
-
sodium dodecyl sulfate polyacrylamide gel electrophoresis
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Deceased, April 23, 1988
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Ueda, T., Kato, Y. & Irie, S. Regional differences in immunostainability of isolated metaphase chromosomes of Indian muntjac with anti-Z-DNA antibody. Chromosoma 99, 161–168 (1990). https://doi.org/10.1007/BF01731126
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DOI: https://doi.org/10.1007/BF01731126