Summary
We developed a new chromosome banding method byin situ hybridization of human Cot-1 DNA as a probe. Clear banding was produced on metaphase chromosomes of lymphoblastoid cells after probe detection with a fluorescent dye Cy3. Comparison with the known banding patterns revelaed a similarity to the R-banding with some significant differences: some centromeric heterochromatin regions show Cot-1 positive bands. This suggests that some repetitive sequences from the heterochromatin regions constitute a major component of Cot-1 DNA. This unique chromosome banding method, Cot-1 banding, may be used as a supplement to the conventional karyotype analysis. Scanning analysis of the fluorescence intensities of Cot-1 banding and Q-banding are useful for objectively analyzing the banding pattern including a detection of chromosome aberrations. The Cot-1 banding with Cy3 is particularly powerful when applied for the gene mapping by fluorescencein situ hybridization (FISH) because red fluorescence of Cy3 for chromosome staining can be readily distinguished from green fluorescence of fluorescein isothiocyanate (FITC) for probe labeling. Using this novel method, we mapped a 4 kb-DNA fragment from myelin protein zero (MPZ) gene on the chromosome 1q22 to q23.
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Wang, Y., Minoshima, S. & Shimizu, N. Cot-1 banding of human chromosomes using fluorescencein situ hybridization with Cy3 labeling. Jap J Human Genet 40, 243–252 (1995). https://doi.org/10.1007/BF01876182
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DOI: https://doi.org/10.1007/BF01876182
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