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. 2022 Aug;269(8):4322-4332.
doi: 10.1007/s00415-022-11068-0. Epub 2022 Mar 29.

Anomia is present pre-symptomatically in frontotemporal dementia due to MAPT mutations

Collaborators, Affiliations

Anomia is present pre-symptomatically in frontotemporal dementia due to MAPT mutations

Arabella Bouzigues et al. J Neurol. 2022 Aug.

Abstract

Introduction: A third of frontotemporal dementia (FTD) is caused by an autosomal-dominant genetic mutation in one of three genes: microtubule-associated protein tau (MAPT), chromosome 9 open reading frame 72 (C9orf72) and progranulin (GRN). Prior studies of prodromal FTD have identified impaired executive function and social cognition early in the disease but few have studied naming in detail.

Methods: We investigated performance on the Boston Naming Test (BNT) in the GENetic Frontotemporal dementia Initiative cohort of 499 mutation carriers and 248 mutation-negative controls divided across three genetic groups: C9orf72, MAPT and GRN. Mutation carriers were further divided into 3 groups according to their global CDR plus NACC FTLD score: 0 (asymptomatic), 0.5 (prodromal) and 1 + (fully symptomatic). Groups were compared using a bootstrapped linear regression model, adjusting for age, sex, language and education. Finally, we identified neural correlates of anomia within carriers of each genetic group using a voxel-based morphometry analysis.

Results: All symptomatic groups performed worse on the BNT than controls with the MAPT symptomatic group scoring the worst. Furthermore, MAPT asymptomatic and prodromal groups performed significantly worse than controls. Correlates of anomia in MAPT mutation carriers included bilateral anterior temporal lobe regions and the anterior insula. Similar bilateral anterior temporal lobe involvement was seen in C9orf72 mutation carriers as well as more widespread left frontal atrophy. In GRN mutation carriers, neural correlates were limited to the left hemisphere, and involved frontal, temporal, insula and striatal regions.

Conclusion: This study suggests the development of early anomia in MAPT mutation carriers, likely to be associated with impaired semantic knowledge. Clinical trials focused on the prodromal period within individuals with MAPT mutations should use language tasks, such as the BNT for patient stratification and as outcome measures.

Keywords: C9orf72; Cognition; Frontotemporal dementia; Naming; Progranulin; Tau.

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Conflict of interest statement

The authors declare that they have no conflict of interest. Johannes Levin reports speaker fees from Bayer Vital, Biogen and Roche, consulting fees from Axon Neuroscience and Biogen, author fees from Thieme medical publishers and W. Kohlhammer GmbH medical publishers, non-financial support from Abbvie and compensation for duty as part-time CMO from MODAG, outside the submitted work.

Figures

Fig. 1
Fig. 1
Mean scores and standard error on the BNT for each group. Significantly worse performance compared with controls is shown with a star in the bar. Only differences between disease groups and controls, and within each genetic group are shown on the graph. Additional between genetic group differences were seen between MAPT 1 + and both GRN and C9orf72 1 + , between MAPT 0.5 and C9orf72 0.5, and between both MAPT 0 and C9orf72 0 and GRN 0
Fig. 2
Fig. 2
Neural correlates of naming in C9orf72, MAPT and GRN mutation carriers. Results are shown on a study-specific T1-weighted MRI template in MNI space and at p < 0.05 for Family-Wise error. Colour bars represent T-values
Fig. 3
Fig. 3
Overlapping neural correlates of naming across the three genetic groups. Comparative results are shown on a study-specific T1-weighted MRI template in MNI space and at p < 0.05 for Family-Wise error. The C9orf72 group are shown in green, the GRN group are shown in red and the MAPT group are shown in yellow

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