Visual impairment cell non-autonomously dysregulates brain-wide proteostasis

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Hearing and vision loss are dementia risk factors, but the molecular links remain unclear.
• Cellular stress responses, particularly protein quality control, are crucial for brain health.

Approach:

• Investigated Drosophila models of blindness to study brain responses.
• Examined stress granule formation and reversal upon vision restoration.
• Analyzed stress granule components (p62, ATF4, XRP1) and their role in gene expression.

Key Points:

• Non-autonomous induction of stress granules in the brain upon vision loss in Drosophila.
• Stress granules sequester transcription factors (ATF4, XRP1), dampening downstream gene expression.
• Similar stress granule markers (p62, ATF4) observed in the brains of blind mouse models.

Conclusions:

• Sensory input loss dysregulates brain stress responses, affecting protein quality control.
• The link between sensory deprivation and altered stress granule dynamics is conserved across species.
• These findings offer insights into molecular mechanisms connecting sensory deficits and dementia risk.