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Journal of Cell Science, Vol 5, 365-372, Copyright © 1969 by Company of Biologists

Submitted on January 8, 1969

Studies on the Autonomy of Pellicular DNA in Paramecium

JOAN SMITH-SONNEBORN 1 and W. PLAUT 1

1 Zoology Research Building, University of Wisconsin Madison, Wisconsin, U.S.A.

This autoradiographic study was designed to elucidate the relationship between the macronucleus and pellicular DNA in Paramecium. The capacity of the cell to synthesize pellicular DNA in the absence of the macronucleus was established by demonstrating the incorporation of tritiated thymidine into DNase-sensitive material in the pellicles of amacronucleate cells. Moreover, using a technique which leads to selective labelling of the macronucleus in normal paramecia, we have looked for evidence of transfer of labelled DNA from the macronucleus to the pellicle with time. Finding none, we conclude that labelled pellicular DNA is not of macronuclear origin, and that labelled pellicular DNA synthesis is not directly dependent on the presence of the macronucleus.

Submitted on January 8, 1969






© The Company of Biologists Ltd 1969