A University of Arizona Health Sciences study found that a specific genotype of the APOE gene, better known as the Alzheimers gene, is able to significantly influence metabolic changes and override sex-specific differences between men and women with Alzheimers disease.
The discovery may provide critical insights for personalized medicine related to late-onset Alzheimers disease, a complex neurodegenerative disease characterized by multiple progressive stages including cognitive decline.
One of the most interesting findings of our study is the identification of key drivers of metabolic pathways that discriminate between Alzheimers disease and cognitively normal individuals when patient groups were separated by sex and APOE genotype, said Rui Chang, PhD, a member of the University of Arizona Health Sciences Center for Innovation in Brain Science and lead author of the study. These patient-specific metabolic targets will shed light on the discovery of precision therapeutics for Alzheimers patients, which has not been done in previous studies.
The paper, Predictive metabolic networks reveal sex and APOE genotype-specific metabolic signatures and drivers for precision medicine in Alzheimers Disease, was published today in Alzheimers and Dementia: The Journal of the Alzheimers Association.
The APOE gene is involved in making a protein that helps carry cholesterol and other types of fat in the bloodstream. There are several genotypes, or variations, of APOE based on the specific gene variants an individual inherits. The APOEe4 genotype has been identified as a risk factor for Alzheimers disease.
Dr. Chang and the research team integrated a metabolic network model with advanced machine learning approaches to perform a computational analysis on 1,517 serum samples provided by the Alzheimers Disease Neuroimaging Initiative.
First, they identified common metabolic signatures of late-onset Alzheimers disease. Next, they separated the network into clusters by sex to identify sex-specific metabolic changes and by genotype to identify other metabolic signatures influenced by the APOEe4 genotype.
Finally, they stratified patients by intersection of sex and APOEe4 status together and found that the APOEe4 genotype was able to significantly influence metabolic changes while overriding sex-specific differences in males and females.
Additionally, they identified serum-based metabolic biomarker panels that are predictive of disease state and associated with clinical cognitive function for each of the eight patient subgroups stratified by sex and/or APOEe4 status.
These novel patient-specific metabolic panels identify key metabolic drivers of late-onset Alzheimers disease that could be evaluated as therapeutic targets. The findings have the potential to greatly accelerate drug development for Alzheimers disease while providing outcome measures for clinical trials.
"Dr. Changs research provides an initial but critical step toward the development of personalized and precision medicine for Alzheimers disease, said Roberta Diaz Brinton, PhD, Regents Professor of Pharmacology and director of the Center for Innovation in Brain Science. This study provides an operational strategy to achieve that goal by integrating clinical cognitive assessments, metabolic profiling and a computational network model to identify targeted therapeutics for patients.
See more here:
Study Identifies Biomarkers that Could Guide Precision Medicine Therapies for Alzheimer's Disease - University of Arizona
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