AI Article Synopsis
- Delta age is a measure that compares how old your brain is biologically versus your actual age, using data from brain scans and genetics.
- Key brain structures like the fornix and thalamus are identified as important indicators of a higher delta age based on their lower volume.
- Genetic studies show that specific gene variants are linked to delta age and that immune-related factors can play a causal role in accelerating brain aging.
Article Abstract
Delta age is a biomarker of brain aging that captures differences between the chronological age and the predicted biological brain age. Using multimodal data of brain MRI, genomics, and blood-based biomarkers and metabolomics in UK Biobank, this study investigates an explainable and causal basis of high delta age. A visual saliency map of brain regions showed that lower volumes in the fornix and the lower part of the thalamus are key predictors of high delta age. Genome-wide association analysis of the delta age using the SNP array data identified associated variants in gene regions such as KLF3-AS1 and STX1. GWAS was also performed on the volumes in the fornix and the lower part of the thalamus, showing a high genetic correlation with delta age, indicating that they share a genetic basis. Mendelian randomization (MR) for all metabolomic biomarkers and blood-related phenotypes showed that immune-related phenotypes have a causal impact on increasing delta age. Our analysis revealed regions in the brain that are susceptible to the aging process and provided evidence of the causal and genetic connections between immune responses and brain aging.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9883521 | PMC |
| http://dx.doi.org/10.1038/s41598-023-27903-x | DOI Listing |
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