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Physical mapping of genes by fluorescence in situ hybridization (FISH) has become routine using fluorescein isothiocyanate (FITC) for probe detection and propidium iodide (PI) for chromosome staining. We have modified this conventional FISH method in a way that utilizes Texas red (TR) for signal detection and quinacrine mustard (QM) for chromosome banding. Using this Texas red and quinacrine (TRQ) method, we were able to identify individual acrocentric chromosomes with varying degrees of ribosomal RNA gene clusters. Two acrocentric chromosomes were found to carry extremely small number of rRNA gene copies as compared to the other eight counterparts in human diploid lymphoblastoid cell line GM00130B. Thus, the TRQ method allows one to probe for a specific sequence while identifying individual chromosomes and will be powerful for the chromosomal localization of various genes.

Detection of variation in the ribosomal RNA gene clusters by a modified fluorescencein situ hybridization method