Centromeric non-coding RNA as a hidden epigenetic factor of the point centromere

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• Centromeres are essential for chromosome segregation during cell division.
• Centromeric RNAs (cenRNAs) regulate kinetochore activity in various organisms.
• In budding yeast, cenRNA levels are tightly controlled.

Purpose of the Study:

• To elucidate the regulation and function of cenRNAs at the Saccharomyces cerevisiae point centromere.
• To investigate the role of Cbf1 and H2A.Z^Htz1 in cenRNA repression.
• To understand the degradation pathways of cenRNAs.

Main Methods:

• Analysis of centromeric RNA (cenRNA) levels in budding yeast.
• Investigating the role of kinetochore protein Cbf1 and histone variant H2A.Z^Htz1.
• Studying the impact of cell cycle progression on cenRNA expression.
• Examining the degradation of cenRNAs via nuclear RNA decay pathways.

Main Results:

• CenRNAs are repressed by Cbf1 and H2A.Z^Htz1 and de-repressed during S phase.
• Aberrant cenRNA levels disrupt centromere function.
• Budding yeast cenRNAs are identified as cryptic unstable transcripts (CUTs).
• CenRNAs are subject to degradation by the nuclear RNA decay pathway.

Conclusions:

• CenRNAs are dynamically regulated at the budding yeast point centromere.
• Proper cenRNA levels are critical for accurate chromosome segregation.
• Cryptic unstable transcripts (CUTs) can have essential cellular functions when appropriately regulated.