Semantic verbal fluency pattern, dementia rating scores and adaptive behavior correlate with plasma Aβ<inf>42</inf>concentrations in down syndrome young adults

Laura Del Hoyo, Laura Xicota, Gonzalo Sánchez-Benavides, Aida Cuenca-Royo, Susana de Sola, Klaus Langohr, Ana B. Fagundo, Magí Farré, Mara Dierssen, Rafael de la Torre

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14 Citations (Scopus)

Abstract

© 2015 Del Hoyo, Xicota, Sánchez-Benavides, Cuenca-Royo, de Sola, Langohr, Fagundo, Farre, Dierssen and de La Torre. Down syndrome (DS) is an intellectual disability (ID) disorder in which language and specifically, verbal fluency are strongly impaired domains; nearly all adults show neuropathology of Alzheimer’s disease (AD), including amyloid deposition by their fifth decade of life. In the general population, verbal fluency deficits are considered a strong AD predictor being the semantic verbal fluency task (SVFT) a useful tool for enhancing early diagnostic. However, there is a lack of information about the association between the semantic verbal fluency pattern (SVFP) and the biological amyloidosis markers in DS. In the current study, we used the SVFT in young adults with DS to characterize their SVFP, assessing total generated words, clustering, and switching. We then explored its association with early indicators of dementia, adaptive behavior and amyloidosis biomarkers, using the Dementia Questionnaire for Persons with Intellectual Disability (DMR), the Adaptive Behavior Assessment System-Second Edition (ABAS-II), and plasma levels of Aβ peptides (Aβ40and Aβ42), as a potent biomarker of AD. In DS, worse performance in SVFT and poorer communication skills were associated with higher plasma Aβ42concentrations, a higher DMR score and impaired communication skills (ABAS–II). The total word production and switching ability in SVFT were good indicators of plasma Aβ42concentration. In conclusion, we propose the SVFT as a good screening test for early detection of dementia and amyloidosis in young adults with DS.
Original languageEnglish
Article number301
JournalFrontiers in Behavioral Neuroscience
Volume9
Issue numberNOVEMBER
DOIs
Publication statusPublished - 18 Nov 2015

Keywords

  • Alzheimer’s disease
  • Amyloid precursor protein
  • Communication skills
  • DMR
  • Down syndrome
  • Semantic verbal fluency
  • Switching

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