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The nuclear topography of pericentromeric DNA of chromosome 11 was analyzed in G0 (nonstimulated) and G1 [phytohemagglutinin (PHA) stimulated] human lymphocytes by confocal microscopy. In addition to the nuclear center, the centrosome was used as a second point of reference in the three-dimensional (3D) analysis. Pericentromeric DNA of chromosome 11 and the centrosome were labeled using a combination of fluorescent in situ hybridization (FISH) and immunofluorescence. To preserve the 3D morphology of the cells, these techniques were performed on whole cells in suspension. Three-dimensional images of the cells were analyzed with a recently developed 3D software program (Interactive Measurement of Axes and Positioning in 3 Dimensions). The distribution of the chromosome 11 centromeres appeared to be random during the G0 stage but clearly non-random during the G1 stage, when the nuclear center was used as a reference point. Further statistical analysis of the G1 cells revealed that the centromeres were randomly distributed in a shell underlying the nuclear membrane. A topographical relationship between the centrosome and the centromeres appeared to be absent during the G0 and G1 stages of the cell cycle.

The nuclear position of pericentromeric DNA of chromosome 11 appears to be random in GO and non-random in G1 human lymphocytes