Transcription errors induce proteotoxic stress and shorten cellular lifespan

Area of Science:

• Molecular Biology
• Cellular Biology
• Genetics

Background:

• Transcription errors are common in cells but their impact on cellular health is not well understood.
• Understanding the consequences of transcriptional errors is crucial for comprehending cellular dysfunction and disease.
• Previous research has not fully elucidated the link between transcriptional fidelity and cellular aging.

Purpose of the Study:

• To investigate the effects of transcription errors on cellular health and proteostasis.
• To determine if transcription errors contribute to age-related cellular decline.
• To explore the potential role of transcription errors in protein-folding diseases.

Main Methods:

• Utilized genetically engineered yeast cells with error-prone transcription.
• Monitored cellular proteostasis and gene expression in response to transcription errors.
• Assessed the impact of transcription errors on the aggregation of disease-associated peptides and cellular lifespan.

Main Results:

• Cells with increased transcription errors exhibited a significant loss of proteostasis.
• These cells showed increased sensitivity to genes linked to human protein-folding diseases.
• The rate of transcription errors increased with cellular age, exacerbating proteostasis loss.
• Transcription errors accelerated the aggregation of an Alzheimer's disease-implicated peptide and reduced cell lifespan.

Conclusions:

• Transcription errors represent a novel molecular mechanism contributing to cellular disease phenotypes.
• Increased transcriptional errors play a significant role in the decline of proteostasis during cellular aging.
• Transcriptional fidelity is a critical, previously unappreciated factor in maintaining cellular health and longevity.