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Journal of Cell Science, Vol 4, 611-620, Copyright © 1969 by Company of Biologists

Submitted on August 29, 1968

Division and DNA Synthesis in the Kinetoplast of Crithidia Fasciculata

W. ANDERSON 1 and G. C. HILL 2

1 Laboratoire de Biologie Cellulaire 4, Faculté des Sciences 91-Orsay, France; Department of Anatomy, Harvard Medical School, Boston, Massachusetts 02115, U.S.A.
2 University of Kentucky Medical Center, Department of Biochemistry Lexington, Kentucky, U.S.A.

In Crithidia fasciculata division of the kinetoplast occurs prior to karyokinesis. Kinetoplast division involves the lateral replication of the nucleoid, and the subsequent constriction and ‘pinching off’ of the nucleoid and mitochondrial components. Two subunits are produced.

DNA synthesis in the kinetoplast and the nucleus is overlapping but asynchronous. Experiments for short labelling times indicate that the kinetoplast S period either precedes, succeeds or is simultaneous with the nuclear period of DNA synthesis. The kinetoplast divides in a manner in which some radioactivity is transmitted to each unit.

Submitted on August 29, 1968






© The Company of Biologists Ltd 1969