Underlying genetic variation in familial frontotemporal dementia: sequencing of 198 patients

Merel O. Mol, Jeroen G.J. van Rooij, Tsz H. Wong, Shamiram Melhem, Annemieke J.M.H. Verkerk, Anneke J.A. Kievit, Rick van Minkelen, Rosa Rademakers, Cyril Pottier, Laura Donker Kaat, Harro Seelaar, John C. van Swieten, Elise G.P. Dopper

Research output: Contribution to journalArticlepeer-review

Abstract

Frontotemporal dementia (FTD) presents with a wide variability in clinical syndromes, genetic etiologies, and underlying pathologies. Despite the discovery of pathogenic variants in several genes, many familial cases remain unsolved. In a large FTD cohort of 198 familial patients, we aimed to determine the types and frequencies of variants in genes related to FTD. Pathogenic or likely pathogenic variants were revealed in 74 (37%) patients, including 4 novel variants. The repeat expansion in C9orf72 was most common (21%), followed by variants in MAPT (6%), GRN (4.5%), and TARDBP (3.5%). Other pathogenic variants were found in VCP, TBK1, PSEN1, and a novel homozygous variant in OPTN. Furthermore, we identified 15 variants of uncertain significance, including a promising variant in TUBA4A and a frameshift in VCP, for which additional research is needed to confirm pathogenicity. The patients without identified genetic cause demonstrated a wide clinical and pathological variety. Our study contributes to the clinical characterization of the genetic subtypes and confirms the value of whole-exome sequencing in identifying novel genetic variants.

Original languageEnglish (US)
Pages (from-to)148.e9-148.e16
JournalNeurobiology of aging
Volume97
DOIs
StatePublished - Jan 2021

Keywords

  • Familial
  • Frontotemporal dementia
  • Genetic screen
  • Whole-exome sequencing

ASJC Scopus subject areas

  • Neuroscience(all)
  • Aging
  • Clinical Neurology
  • Developmental Biology
  • Geriatrics and Gerontology

Fingerprint Dive into the research topics of 'Underlying genetic variation in familial frontotemporal dementia: sequencing of 198 patients'. Together they form a unique fingerprint.

Cite this