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Structure of interphase macro nuclear chromatin of a ciliate bursaria truncatella 1. electron microscopic and auto radiographic study of chromatin structure changes in the course of ciliate differentiation and growth after cell division



Structure of interphase macro nuclear chromatin of a ciliate bursaria truncatella 1. electron microscopic and auto radiographic study of chromatin structure changes in the course of ciliate differentiation and growth after cell division



Molekulyarnaya Biologiya 17(6): 1306-1311



The structure of interphase chromatin from isolated individual macronuclei of B. truncatella was studied at different times after cell division. During 0.5-3 h after division most of the macronuclear chromatin is represented by loose agglomerations of decondensed chromatin, where transcription complexes can be seen. The maximum quantity of decondensed chromatin is observed 0.5-1.5 h after cell division. During 1.5-3 h after division, the amount decondensed chromatin decreases along with the increase of the quantity of dense chromatin organized in chromatin clumps 0.12-0.18 .mu. in diameter. In completely developed vegetative cells nearly all the chromatin has the structure of closely packed chromatin clumps. EM autoradiography data show that chromatin clumps are transcriptionally inert; all the transcription processes take place in decondensed chromatin agglomerations. The structure of transcription complexes of B. truncatella macronucleus is discussed.

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Accession: 006496745

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