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The Plasmodium cell-cycle: facts and questions

D E Arnot1, K Gull

  • 1Institute of Cell, Animal and Population Biology, University of Edinburgh, U.K. d.e.arnot@ed.ac.uk

Annals of Tropical Medicine and Parasitology
|July 31, 1998
PubMed
Summary

The Plasmodium falciparum life-cycle involves complex cell-cycles, particularly during erythrocytic schizogony. This study examines the timing and nature of DNA synthesis (S phase) and subsequent cell division events, clarifying cell-cycle progression.

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Area of Science:

  • Malaria research
  • Parasitology
  • Cell biology

Background:

  • The Plasmodium life-cycle, responsible for malaria, features poorly understood molecular controls of its discrete cell-cycles.
  • The erythrocytic schizogony stage of Plasmodium falciparum has multiple DNA synthesis periods, but its cell-cycle events remain controversial.
  • Existing studies on DNA synthesis (S phase) timing and subsequent cell division phases (G2 and M) during schizogony lack definitive conclusions.

Purpose of the Study:

  • To investigate the precise nature and timing of cell-cycle events during Plasmodium falciparum erythrocytic schizogony.
  • To address controversies regarding the occurrence of rapid, successive G2 and M phases following DNA synthesis in P. falciparum.
  • To clarify the molecular controls governing the Plasmodium falciparum cell-cycle.

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Main Methods:

  • Review and interpretation of existing flow-cytometric data.
  • Analysis of precursor-incorporation studies related to DNA synthesis.
  • Examination of established knowledge on Plasmodium falciparum cell-cycle events.

Main Results:

  • DNA synthesis (S phase) in P. falciparum begins approximately 28-31 hours post-merozoite invasion.
  • Controversy persists regarding whether rapid, successive G2 and M phases follow S phase during schizogony.
  • Interpretation challenges in flow-cytometric and precursor-incorporation studies hinder definitive conclusions.

Conclusions:

  • The precise cell-cycle progression during Plasmodium falciparum erythrocytic schizogony requires further elucidation.
  • Understanding these cell-cycle dynamics is crucial for developing effective malaria control strategies.
  • Further research is needed to resolve the debate on the sequence and timing of G2 and M phases in P. falciparum.