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Basic Science and Pathogenesis.

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Behavioral variant frontotemporal dementia (bvFTD) shows significant genetic and neuropathological diversity. This study reveals a high prevalence of co-pathology, particularly Alzheimer's disease neuropathologic changes (ADNC), in bvFTD cases.

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Area of Science:

  • Neuroscience
  • Genetics
  • Pathology

Background:

  • Behavioral variant frontotemporal dementia (bvFTD) is a common FTD presentation with diverse underlying causes.
  • Understanding bvFTD's genetic and pathological landscape is crucial for diagnosis and treatment.

Purpose of the Study:

  • To investigate the genetic and neuropathological features of a large bvFTD cohort.
  • To identify patterns of familial risk and co-pathologies in bvFTD.

Main Methods:

  • Characterized 410 bvFTD cases using Rascovsky criteria, excluding other dementia types.
  • Assessed familial risk via pedigrees and performed gene burden analysis.
  • Examined neuropathological features in 88 cases, including FTLD-TDP, FTLD-Tau, and co-pathologies like ADNC.

Main Results:

  • Identified 107 monogenic cases, suggesting a higher familial burden than previously thought.
  • Found FTLD-TDP in 59.1% and FTLD-Tau in 39.8% of neuropathologically examined cases.
  • Observed high rates of co-pathology, with ADNC present in 50% of FTLD-TDP and 37% of FTLD-Tau cases.

Conclusions:

  • bvFTD exhibits significant genetic enrichment and high rates of co-pathology, especially ADNC.
  • Findings on ADNC co-pathology have implications for emerging disease-modifying therapies.
  • Further gene burden analysis is needed to identify rare variants contributing to bvFTD.