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Murray, Melissa E.; Cannon, Ashley; Graff-Radford, Neill R.; Liesinger, Amanda M.; Rutherford, Nicola J.; Ross, Owen A.; Duara, Ranjan; Carrasquillo, Minerva M.; Rademakers, Rosa; Dickson, Dennis W.
Acta neuropathologica, 09/2014, Volume: 128, Issue: 3Journal Article
Hippocampal sclerosis of the elderly (HpScl) and Alzheimer’s disease (AD), especially the limbic-predominant subtype (LP-AD), are amnestic syndromes that can be difficult to distinguish. To complicate matters, a subset has concomitant HpScl and AD (HpScl-AD). We examined a large cohort of autopsy-confirmed cases of HpScl, HpScl-AD, LP-AD, and typical AD to identify distinct clinical, genetic, and pathologic characteristics. HpScl cases were significantly older at death and had a substantially slower rate of cognitive decline than the AD subtypes. Genetic analysis revealed that the AD groups (AD, LP-AD, and HpScl–AD) were more likely to be APOE ε4 carriers. In contrast, the HpScl groups (HpScl and HpScl-AD) were more likely to exhibit genetic variants in GRN and TMEM106B that are associated with frontotemporal lobar degeneration. The HpScl groups had a high frequency of TDP-43 pathology that was most often Type A morphology and distribution, while typical AD and LP-AD had a significantly lower frequency of TDP-43 pathology that was most often Type B. These results suggest that HpScl and AD are pathologically and genetically distinct and non-synergistic neurodegenerative processes that present with amnestic dementia. Pure HpScl and HpScl with concomitant AD occur most often in elderly individuals.
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