Flagellar duplication and migration during the Trichomonas vaginalis cell cycle

Area of Science:

• Cell Biology
• Protozoology
• Eukaryotic Evolution

Background:

• Trichomonas vaginalis possesses basal bodies but lacks centrioles, offering insights into early eukaryotic evolution.
• Understanding the cell cycle dynamics of basal body-associated structures is crucial for evolutionary cell biology.

Purpose of the Study:

• To investigate the cell cycle-dependent dynamics of flagella in Trichomonas vaginalis.
• To explore the potential role of flagella in spindle pole organization in early eukaryotes.

Main Methods:

• Immunofluorescence microscopy was employed to visualize flagellar behavior throughout the cell cycle.
• Analysis focused on flagellar duplication, segregation, and association with nuclear and spindle poles.

Main Results:

• Trichomonas vaginalis flagella undergo duplication during the S-phase of the cell cycle.
• These duplicated flagella migrate to and emanate from the spindle poles during mitosis.
• This behavior mirrors that of centrioles and other microtubule organizing centers.

Conclusions:

• The cell cycle-dependent dynamics of T. vaginalis flagella parallel centriole behavior, suggesting a conserved function.
• Flagella may have provided essential motile forces for spindle pole alignment in ancestral eukaryotic cells.