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Nucleic Acids Research, 1986, Vol. 14, No. 8 3241-3249
© 1986

Articles

Permanent attachment of replication origins to the nuclear matrix in BHK-cells

Peter A. Dijkwel, Paul W. Wenink and Jozef Poddighe

Department of Chemical Cytology, University of Nijmegen Toernooiveld, 6525 ED Nijmegen, The Netherlands

Received January 31, 1986. Revised March 19, 1986. Accepted March 19, 1986.

The position of replication origins and replication forks relative to the nuclear matrix was analysed by autoradiography. Analysis of 2M NaCl-extracted BHK-nuclei, prepared on covers lips, showed that after brief pulses grains were exclusively found over the central core of the residual nuclei, which corresponds to positions in the nuclear matrix. In asynchronuous cells these grains were found to migrate into the DNA-halo surrounding the matrix during a subsequent chase. When the pulse had been administered to synchro-nuous cells at the onset of S-phase, it was observed, however, that in the majority of the structures no such migration had occurred. From this, and from the fact that label incorporated later in S-phase could be chased into the halo, we conclude that, contrary to DNA in replication forks, DNA containing replication origins is permanently attached to the nuclear matrix.


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