Early symptoms in symptomatic and preclinical genetic frontotemporal lobar degeneration: Journal of Neurology, Neurosurgery and Psychiatry

T.P. Tavares, D.G.V. Mitchell, K.K.L. Coleman, B.L. Coleman, C.L. Shoesmith, C.R. Butler, I. Santana, A. Danek, A. Gerhard, A. De Mendonca, B. Borroni, M.C. Tartaglia, C. Graff, D. Galimberti, F. Tagliavini, F. Moreno, G. Frisoni, J.B. Rowe, J. Levin, J.C. Van SwietenM. Otto, M. Synofzik, R. Sanchez-Valle, R. Vandenberghe, R.J. Laforce, R. Ghidoni, S. Sorbi, S. Ducharme, M. Masellis, J. Rohrer, E. Finger

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives The clinical heterogeneity of frontotemporal dementia (FTD) complicates identification of biomarkers for clinical trials that may be sensitive during the prediagnostic stage. It is not known whether cognitive or behavioural changes during the preclinical period are predictive of genetic status or conversion to clinical FTD. The first objective was to evaluate the most frequent initial symptoms in patients with genetic FTD. The second objective was to evaluate whether preclinical mutation carriers demonstrate unique FTD-related symptoms relative to familial mutation non-carriers. Methods The current study used data from the Genetic Frontotemporal Dementia Initiative multicentre cohort study collected between 2012 and 2018. Participants included symptomatic carriers (n=185) of a pathogenic mutation in chromosome 9 open reading frame 72 (C9orf72), progranulin (GRN) or microtubule-associated protein tau (MAPT) and their first-degree biological family members (n=588). Symptom endorsement was documented using informant and clinician-rated scales. Results The most frequently endorsed initial symptoms among symptomatic patients were apathy (23%), disinhibition (18%), memory impairments (12%), decreased fluency (8%) and impaired articulation (5%). Predominant first symptoms were usually discordant between family members. Relative to biologically related non-carriers, preclinical MAPT carriers endorsed worse mood and sleep symptoms, and C9orf72 carriers endorsed marginally greater abnormal behaviours. Preclinical GRN carriers endorsed less mood symptoms compared with non-carriers, and worse everyday skills. Conclusion Preclinical mutation carriers exhibited neuropsychiatric symptoms compared with non-carriers that may be considered as future clinical trial outcomes. Given the heterogeneity in symptoms, the detection of clinical transition to symptomatic FTD may be best captured by composite indices integrating the most common initial symptoms for each genetic group. © Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.
Original languageEnglish
Pages (from-to)975-984
Number of pages10
JournalJ. Neurol. Neurosurg. Psychiatry
Volume91
Issue number9
DOIs
Publication statusPublished - 2020

Keywords

  • guanine nucleotide exchange C9orf72
  • progranulin
  • tau protein
  • C9orf72 protein, human
  • GRN protein, human
  • MAPT protein, human
  • adult
  • apathy
  • Article
  • C9orf72 gene
  • chromosome 9
  • chromosome mutation
  • cohort analysis
  • disease course
  • female
  • first-degree relative
  • fluency disorder
  • frontotemporal dementia
  • gene
  • genetic heterogeneity
  • GRN gene
  • health care personnel
  • human
  • major clinical study
  • male
  • MAPT gene
  • memory disorder
  • mental disease
  • middle aged
  • mood disorder
  • open reading frame
  • priority journal
  • scoring system
  • sleep disorder
  • speech sound disorder
  • clinical trial
  • genetics
  • heterozygote
  • multicenter study
  • mutation
  • prodromal symptom
  • Adult
  • C9orf72 Protein
  • Female
  • Frontotemporal Dementia
  • Heterozygote
  • Humans
  • Male
  • Middle Aged
  • Mutation
  • Prodromal Symptoms
  • Progranulins
  • tau Proteins

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