Figure 1.

Histone H3 and H1 levels are reduced relative to genomic DNA content. Histone H3 and genomic DNA content were measured simultaneously in uninfected T-cell lines (CEM, Jurkat and Molt4) and HTLV-1 infected T-cell lines (SLB-1, HuT102 and C81) using flow cytometry. H3 levels were measured using a primary antibody directed against the C-terminal domain and an Alexa-488 labeled secondary antibody. DNA content was measured using propidium iodide. (A) Mean histone H3 immunofluorescent intensity was traced from G1 through G2/M by defining a narrow window on the DNA histogram and plotted against the genomic DNA content for the corresponding cell population defined by the window. (B) The average histone H3:DNA ratios of three experiments during G1, Mid-S and G2/M are shown for HTLV-1 infected and uninfected T-cell lines (see Table 1 for p-values) (C) Histone H1 and genomic DNA content were measured simultaneously in uninfected T-cell lines (Jurkat and Molt4) and in HTLV-1 infected T-cell lines (C81 and HuT102) using flow cytometry. H1 levels were measured using a primary antibody directed against the C-terminal domain and an Alexa-488 labeled secondary antibody. DNA content was measured using propidium iodide. Mean histone H1 immunofluorescent intensity was traced from G1 through G2/M by defining a narrow window on the DNA histogram and plotted against the genomic DNA content for the corresponding cell population defined by the window. (D) The average histone H1:DNA ratios during G1, Mid-S and G2/M are shown for HTLV-1 infected and uninfected T-cell lines (see Table 2 for p-values).