Abstract

Chromatin-associated non-histone proteins of the sea urchin embryo are heterogeneous, and undergo qualitative as well as quantitative changes throughout early development. The rate of synthesis of these proteins is fairly constant to the pluteus stage and, in contrast to histone synthesis, does not parallel changes in the rates of synthesis of DNA. Evidence for a pool of chromatin-associated nonhistone proteins is provided by following the kinetics of entry into chromatin of labeled protein in pulse-chase experiments of prolonged duration. This pool is synthesized during cleavage and some non-histone proteins continue to associate with chromatin until gastrulation. In addition, different rates of entry of non-histone proteins into chromatin could be detected at different stages.

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