Exp Cell Res 1990 Jun 01;1882:226-34. doi: 10.1016/0014-4827(90)90164-6.

6DMAP inhibits chromatin decondensation but not sperm histone kinase in sea urchin male pronuclei.

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Treatment of sea urchin eggs for 10 min prior to fertilization with the kinase inhibitor 6DMAP (6-dimethylaminopurine) reversibly inhibits swelling and loss of conical morphology of the male pronucleus. Male pronuclei inhibited with 1 mM 6DMAP for 25 min undergo phosphorylation of Sp H1 and Sp H2B histones as fully as do control nuclei. Therefore, Sp histone kinase, whose target sequences resemble those of the M-phase histone kinase, is not inhibited by 6DMAP, and Sp histone phosphorylation, although it may be necessary, is not sufficient for chromatin decondensation.

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Genes referenced: LOC100887844