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Frontotemporal dementia

Frontotemporal dementia - https://jmg.bmj.com/content/60/9/894

Background: The triggering receptor expressed on myeloid cell 2 (TREM2) is a major regulator of neuroinflammatory processes in neurodegeneration. To date, the p.H157Y variant of TREM2 has been reported only in Alzheimer’s disease patients. Here, we report three frontotemporal dementia (FTD) patients from three unrelated families with heterozygous p.H157Y variant of TREM2: two patients from Colombian families (Study 1) and a third Mexican origin case from the United States (Study 2).

Methods: To determine if the p.H157Y variant might be associated with a specific FTD presentation, we compared in each study, the cases with age-, sex-, and education- matched groups – a healthy control group (HC) and a group with FTD with neither TREM2 mutations nor family antecedents (Ng-FTD and Ng-FTD-MND).

Results: The two Colombian cases presented with early behavioral changes, greater impairments in general cognition and executive function compared to both HC and Ng- FTD groups. These patients also exhibited brain atrophy in areas characteristic of FTD. Furthermore, TREM2 cases showed increased atrophy compared to Ng-FTD in frontal, temporal, parietal, precuneus, basal ganglia, parahippocampal/hippocampal, and cerebellar regions. The Mexican case presented with FTD and motor neuron disease (MND), showing gray matter reduction in basal ganglia and thalamus, and extensive TDP-43 type B pathology.

Conclusion: In all TREM2 cases, multiple atrophy peaks overlapped with the maximum peaks of TREM2 gene expression in crucial brain regions including frontal, temporal, thalamic, and basal ganglia areas. These results provide the first report of an FTD presentation potentially associated with the p.H157Y variant with exacerbated<br />
neurocognitive impairments. 

Buscador UdeSA

Frontotemporal dementia presentation in patients with heterozygous p.H157Y variant of TREM2

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UdeSA - Universidad de San Andrés

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