title: Inhibitory effect of ethidium bromide on mitotic chromosome condensation and its application to high-resolution chromosome banding.
abstract: Ethidium bromide (EB) is known to intercalate between stacked base pairs without specific base-pair preference. Its use in cultured human lymphocytes and Burkitt's lymphoma cells resulted in the accumulation of cells in prophase and prometaphase stages. Inhibition of mitotic chromosome condensation as a possible mechanism involved in this phenomenon is discussed. A simple method for obtaining high-resolution banding patterns on elongated chromosomes was devised as follows: Human lymphocytes cultured for 3 days with phytohemagglutinin were exposed to EB (5-10 micrograms/ml) and Colcemid (0.02 micrograms/ml) simultaneously for 2 h and then routinely harvested for chromosome preparation. High-resolution G-bands were obtained by Giemsa staining following mild trypsin treatment.
mesh_terms: D002051:Burkitt Lymphoma / Q000235:genetics; D002460:Cell Line; D002478:Cells, Cultured; D002871:Chromosome Banding; D004996:Ethidium / Q000633:toxicity*; D006801:Humans; D007621:Karyotyping; D008214:Lymphocytes / Q000187:drug effects / Q000502:physiology*; D008938:Mitosis / Q000187:drug effects*; D014357:Trypsin
chemical_list: D014357:Trypsin; D004996:Ethidium