Abnormal Hearing Phenotypes in "Ignorome" Knockout Mice as Predictors of Cognitive Dysfunction

Area of Science:

• Neuroscience
• Genetics
• Auditory Science

Background:

• Alzheimer's disease and related dementias (ADRD) affect millions globally, posing a significant public health challenge.
• Age-related hearing loss is a strong predictor of ADRD risk, suggesting auditory dysfunction as a potential early biomarker.
• Current ADRD animal models often focus on rare familial mutations, failing to capture the complexity of late-onset disease.

Purpose of the Study:

• To explore genetic contributions to ADRD and the link between hearing and cognition.
• To investigate broader genetic factors beyond rare familial mutations.
• To identify candidate genes and pathways connecting hearing loss and cognitive decline.

Main Methods:

• Leveraged data from the International Mouse Phenotyping Consortium, a large resource of standardized knockout mouse lines.
• Analyzed auditory and behavioral phenotypes across thousands of mouse lines.
• Performed Gene Ontology enrichment analyses to identify biological processes.

Main Results:

• Genes with abnormal auditory phenotypes were more likely to exhibit behavioral abnormalities.
• Auditory dysfunction showed stronger associations with behavioral traits than vision.
• Higher auditory brainstem response thresholds correlated with increased behavioral abnormalities.

Conclusions:

• Findings highlight candidate genes and molecular pathways linking age-related hearing loss and ADRD.
• Mouse models with auditory and behavioral deficits offer better representations of late-onset ADRD complexity.
• Suggests potential for early detection and intervention strategies targeting sensory decline.