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We have investigated the changes in the relative amounts of histone H1 zero and all five H1 variants during the differentiation in vitro of Friend erythroleukaemic cells. Three different agents were used as inducers of differentiation: dimethyl sulphoxide, hexamethylenebisacetamide and sodium butyrate. By applying a combination of reverse-phase h.p.l.c. and one-dimensional gel electrophoresis we observed that, during differentiation in vitro, (1) the relative amount of each subtype changes upon induction and that (2) dimethyl sulphoxide and hexamethylenebisacetamide produce a similar histone H1 pattern with a strong increase in histones H1 zero and H1c, a modest increase in histone H1e and a decrease in the relative amounts of histone H1a, H1b and H1d, whereas butyrate induces a different pattern, particularly with respect to both histones H1c and H1e: H1c increased slightly, and H1e strongly, during differentiation. These results are compared with changes in the histone H1 pattern during differentiation in vivo in the mouse [Lennox &amp; Cohen (1983) J. Biol. Chem. 258, 262-268] and in the rat [Pina, Martinez &amp; Suau (1987) Eur. J. Biochem. 164, 71-76], and similarities and deviations are discussed.

Alteration in proportions of histone H1 variants during the differentiation of murine erythroleukaemic cells