A systematic genetic screen identifies essential factors involved in nuclear size control

Area of Science:

• Cell Biology
• Genetics
• Molecular Biology

Background:

• Nuclear size is known to correlate with cell size.
• The precise molecular mechanisms governing this nuclear-to-cell size scaling remain largely unknown.
• Understanding this relationship is crucial for comprehending fundamental cell growth processes.

Purpose of the Study:

• To identify essential genes and cellular processes that regulate nuclear size in fission yeast.
• To elucidate the mechanisms underlying the scaling of nuclear size with cell size.
• To uncover novel factors and pathways involved in nuclear size control.

Main Methods:

• Conducted a large-scale genetic screen of fission yeast gene deletion mutants.
• Analyzed mutants exhibiting altered nuclear size phenotypes.
• Utilized computational and microscopic analyses to identify key factors and pathways.

Main Results:

• Identified 25 essential genes that significantly impact nuclear size.
• Demonstrated the involvement of RNA processing pathways and the LINC complex in nuclear size regulation.
• Observed a range of nuclear size phenotypes, including extreme increases and decreases.

Conclusions:

• RNA processing and LINC complexes are critical for maintaining proper nuclear size.
• This study reveals global cellular processes and specific nuclear components essential for nuclear size control.
• The findings provide a foundation for further investigation into cell size homeostasis.