Ultrastructural features of spindle microtubule organization during the nuclear division of Encephalitozoon hellem

L. Sacchi, E. Bigliardi, P. Lanzariini, S. Corona, S. Gatti, M. Scaglia

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Abstract

Ultrastructural studies were carried out to describe the nuclear division cycle of a strain of Encephalitozoon hellem isolated from an Italian AIDS patient. The nuclear division occurs during the proliferative vegetative phase and it is characterized by the intranuclear mitosis and by the lack of centrioles. The spindle termini are electron dense spindle plaques (ESPs), resembling to the spindle pole bodies (SPBs) of Saccharomycetes. The ESPs are bifacial organella forming microtubules on both nucleoplasmic and cytoplasmic faces. In the outer layer of the spindle plaque are present vesicular elements lined by a double membrane of unknown function. The peculiar morphological features of E. hellem ESPs indicate that both intranuclear spindle and cytoplasmic microtubules are involved in the nuclear division.

Original languageEnglish
JournalJournal of Eukaryotic Microbiology
Volume44
Issue number6
Publication statusPublished - Nov 1997

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Keywords

  • Encephalitozoon hellem
  • Microsporidia
  • Nuclear division

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Applied Microbiology and Biotechnology
  • Agricultural and Biological Sciences (miscellaneous)
  • Microbiology

Cite this

Sacchi, L., Bigliardi, E., Lanzariini, P., Corona, S., Gatti, S., & Scaglia, M. (1997). Ultrastructural features of spindle microtubule organization during the nuclear division of Encephalitozoon hellem. Journal of Eukaryotic Microbiology, 44(6).