Nucleic Acids Research, Vol 24, Issue 22 4415-4419, Copyright © 1996 by Oxford University Press
J Wen, C Maercker and HJ Lipps
Elimination of internal eliminated sequences (IES) during macronuclear
development of the hypotrichous ciliate Stylonychia lemnae was analyzed in
one cluster of macronuclear precursor DNA sequences. The results indicate
that IES elimination is a highly ordered process, it starts very early
during macronuclear development and has only finished immediately before
DNA fragmentation takes place. It occurs in distinct steps and the IES are
eliminated in a specific order, where a defined IES is only removed after
complete elimination of other IES. Transfection experiments clearly
demonstrate that the structure of the IES itself is not sufficient for its
correct excision but other cis- acting sequences or additional structural
requirements are needed for IES elimination.
ARTICLES
Sequential excision of internal eliminated DNA sequences in the differentiating macronucleus of the hypotrichous ciliate Stylonychia lemnae
Institut fur Zellbiologie, Universitat Witten/Herdecke, Germany.
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