Abstract
Methods are described for the induction of amitotic cell division in Acanthamoeba rhysodes. Induced amitotic cell division in this organism is similar to normal cytokinesis in many respects, however, the nucleus is partitioned during its interphase state so that the daughter products of amitosis are not viable. It is proposed that the induction of amitotic cell division causes the amoeba to produce the normal cytoplasmic components responsible for cell division in the absence of nuclear mitosis. This is not a normal stage in the amoeba's life cycle and it appears to be a genetic defect unique to this strain of Acanthamoeba. Evidence is presented that induction of amitotic cell division requires protein synthesis but not ribonucleic acid synthesis. Further, induced amoebae require a period of adhesion to a foreign substrate before they are capable of amitosis. The pattern of amitotic cell division could be interpreted as a segregation of discrete cytoplasmic units, generated during induction.
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