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Dementia is very common in the elderly and its incidence increases in an age-dependent fashion. Alzheimer''s disease and vascular cognitive decline are the most common cases of dementia in the elderly. Amyloid burden and increased levels of oxidative damage have been implicated to play significant roles in the pathogenesis of late-onset dementia. In this paper we propose that there are three major genetic factors that may modulate the risk for dementia in later life: carriership of APOE variant alleles, carriership of mitochondrial DNA of haplogroups associated with ineffective oxygen utilisation (specifically, haplogroup H) and carriership of genetic polymorphisms conferring subtly deficient DNA repair. All three factors are quite common in the European populations. Each of these three factors may not have significant effect on the phenotype when taken separately, but when combined in the same genotype, the effects may be cumulative. Further studies are needed in order to elucidate the genotype-phenotype relationships and provide a reliable basis for assessment of the genetic risk for sporadic late-onset dementia. Lifestyle alterations and therapies targeted at decreasing the oxidative burden to aging cells and tissues may decrease the risk for neurological decline in later life

biodiscovery

APOE4, oxidative stress and decreased repair capacity - a no-brainer. Faulty lipid metabolism and increased levels of oxidative damage may be risk factors in the pathogenesis of late-onset dementia