Omics‐derived biological modules reflect metabolic brain changes in Alzheimer's disease

INTRODUCTION Brain glucose hypometabolism, indexed by the fluorodeoxyglucose positron emission tomography ([18F]FDG‐PET) imaging, is a metabolic signature of Alzheimer's disease (AD). However, the underlying biological pathways involved in these metabolic changes remain elusive. METHODS Here, we integrated [18F]FDG‐PET images with blood and hippocampal transcriptomic data from cognitively unimpaired (CU, n = 445) and cognitively impaired (CI, n = 749) individuals using modular dimension reduction techniques and voxel‐wise linear regression analysis. RESULTS Our results showed that multiple transcriptomic modules are associated with brain [18F]FDG‐PET metabolism, with the top hits being a protein serine/threonine kinase activity gene cluster (peak‐t(223) = 4.86, P value