A centriole-free Drosophila cell line. A high voltage EM study

Area of Science:

• Cell Biology
• Microscopy
• Genetics

Background:

• Centrioles are crucial for cell division and organization in many eukaryotes.
• The 1182-4D cell line of Drosophila melanogaster has been reported to lack centrioles, a finding that requires further investigation.

Purpose of the Study:

• To re-examine the presence or absence of centrioles in the 1182-4D Drosophila melanogaster cell line.
• To confirm the centriole-free nature of the 1182-4D cell line using advanced microscopy techniques.

Main Methods:

• High voltage electron microscopy (HVEM) was employed for high-resolution imaging.
• Hypotonic treatment of cells prior to fixation enhanced centriole visibility.
• Multiple analytical approaches were used, including random sectioning, blind testing, and serial sectioning of cells.

Main Results:

• No centrioles were detected in 1500 random 0.5-micron sections of the 1182-4D cell line.
• Blind tests correctly identified 1182-4D cells as centriole-lacking compared to control Kc cells.
• Comprehensive serial sectioning of 1182-4D cells revealed a complete absence of centrioles.

Conclusions:

• The Drosophila melanogaster 1182-4D cell line, maintained in culture for years, is definitively free of centrioles.
• This finding has implications for understanding centriole function and cell cycle regulation in the absence of these organelles.