Chromatin elimination in the hypotrichous ciliate Stylonychia mytilus |
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Authors: | G F Meyer H J Lipps |
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Institution: | (1) Max Planck Institut für Biologie, Abt. Beermann and Institut für Biologie III, Abteilung Zellbiologie, Universität Tübingen, D-7400 Tübingen, Federal Republic of Germany |
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Abstract: | Chromatin elimination in the hypotrichous ciliate Stylonychia mytilus was studied by means of electron microscopy using a microspreading procedure. In the polytene chromosomes of the macronuclear anlagen three organization patterns are observed: Bands of various size composed of 300 Å chromatin fibers, large blocks of 300 Å nucleofilaments which probably represent the heterochromatic regions of the chromosome and axial 120 Å filaments. Those DNA sequences which become eliminated belong to the 300 Å fiber type. The eliminated chromatin occurs in the form of rings of variable size corresponding to a DNA content between 18 and 160 Kb while the axial 120 Å filaments appear to be preserved. |
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