Molecular differences in Alzheimer's disease between male and female patients determined by integrative network analysis

• Published in: Journal of cellular and molecular medicine Vol. 23; no. 1; pp. 47 - 58
• Main Authors: Sun, Lin‐Lin, Yang, Song‐Lin, Sun, Hui, Li, Wei‐Da, Duan, Shu‐Rong
• Format: Journal Article
• Language: English
• Published: England John Wiley & Sons, Inc 01.01.2019; John Wiley and Sons Inc
• Subjects: Alzheimer Disease - genetics; Alzheimer Disease - pathology; Alzheimer's disease; Aspartoacylase; Brain - metabolism; Cortex (parietal); Dementia disorders; Estrogens; Female; Females; Gender aspects; Gender differences; Gene expression; Gene Expression Profiling - methods; Gene Regulatory Networks; Genes; Geriatrics; Glutamic acid receptors (metabotropic); Glycogen; Glycogen synthase kinase 3; Humans; integrative network; Kinases; Kinesin; Male; Males; Neurodegenerative diseases; Occipital lobe; Occipital Lobe - metabolism; Older people; Original; Prefrontal cortex; Prefrontal Cortex - metabolism; Sex; Sex differences; Sex Factors; Superior parietal lobule; temporal and spatial patterns; Temporal cortex; Visual cortex; Visual Cortex - metabolism; Alzheimer's disease; temporal and spatial patterns; integrative network; sex differences
• ISSN: 1582-1838; 1582-4934
• DOI: 10.1111/jcmm.13852

Alzheimer's disease (AD) is a complex neurodegenerative disease and the most common cause of dementia among the elderly. There has been increasing recognition of sex differences in AD prevalence, clinical manifestation, disease course and prognosis. However, there have been few studies on the molecular mechanism underlying these differences. To address this issue, we carried out global gene expression and integrative network analyses based on expression profiles (GSE84422) across 17 cortical regions of 125 individuals with AD. There were few genes that were differentially expressed across the 17 regions between the two sexes, with only four (encoding glutamate metabotropic receptor 2, oestrogen‐related receptor beta, kinesin family member 26B, and aspartoacylase) that were differentially expressed in three regions. A pan‐cortical brain region co‐expression network analysis identified pathways and genes (eg, glycogen synthase kinase 3β) that were significantly associated with clinical characteristics of AD (such as neurofibrillary score) in males only. Similarity analyses between region‐specific networks indicated that male patients exhibited greater variability, especially in the superior parietal lobule, dorsolateral prefrontal cortex and occipital visual cortex. A network module analysis revealed an association between clinical traits and crosstalk of sex‐specific modules. An examination of temporal and spatial patterns of sex differences in AD showed that molecular networks were more conserved in females than in males in different cortical regions and at different AD stages. These findings provide insight into critical molecular pathways governing sex differences in AD pathology.