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We demonstrated that the three-dimensional (3-D) locational and morphological differences of chromosome 17 are dependent on each cell cycle phase in the clinical materials. Cell suspensions prepared from hypertrophied tonsil were hybridized with chromosome 17 whole painting probe or its centromeric probe and the probes were detected with fluorescein isothiocyanate. Then the cells were sorted from G(0+1), S-, and G(2+M)-phase fractions by flow cytometry and observed by confocal laser scanning microscopy to obtain the serial optical sections. The 3-D images were obtained by assembling these sections using a computerized image analysis device. The distribution of centromeric copies was analyzed statistically, and the data values were not a population of random distribution within a sphere. The copies were observed in the periphery of the nuclei in G(0+1)- and S-phase. The 3-D images revealed that chromosome 17 was oval in shape in the G(0+1)-phase nucleus, and was changing into a flame shape in the S-phase, with arms stretching out along the nuclear membrane, and looked bush shaped in G2-phase. The eccentric distribution of chromosome 17 in G(0+1)- and S-phase nuclei may reflect the optimal efficiency of incorporating and/or releasing essential materials and products.

Reconstructed three-dimensional images of flow-sorted nuclei hybridized with chromosome-specific probes.