Two distinct classes of degenerative change are independently linked to clinical progression in Mild Cognitive Impairment

Abstract

We previously demonstrated two statistically distinct factors of degeneration in Alzheimer’s disease (AD): one strongly related to white matter damage and age interpreted as ‘age- and vascular-related’, and the other related to cortical atrophy thought to represent ‘neurodegenerative changes associated with AD’. Those factors are now replicated in a distinct cross-sectional dataset of 364 participants from the Alzheimer’s Disease Neuroimaging Initiative and their interpretation is improved using correlations with CSF biomarkers. Furthermore, we now show that changes in both factors over two years are independently associated with decline in Mini-Mental State Examination (MMSE) score in a longitudinal subset of 116 individuals with mild cognitive impairment. Progression in the ‘age- and vascular-related’ factor was greater for individuals with two APOE ε 4 alleles and linked to a greater attributable change in MMSE than the ‘neurodegenerative’ factor. These results suggest benefits of targeting white matter and vascular health to complement interventions focused on the neurodegenerative aspect of the disease, even in individuals with little discernable vascular comorbidity.