Abstract
Brain-derived natriuretic factor (BDNF) Val66Met polymorphism has been frequently reported to be associated with Alzheimer’s disease (AD) with contrasting results. Numerous studies showed that Met allele increased the risk of AD only in women, while other studies have found worse cognitive performance in Val/Val carriers. We aimed to inquire the effects of Val66Met polymorphism on the progression from subjective cognitive decline (SCD) to mild cognitive impairment (MCI) and from MCI to AD and to ascertain if this effect is modulated by demographic and cognitive variables. For this purpose, we followed up 74 subjects (48 SCD, 26 MCI) for a mean time of 9 years. All participants underwent extensive neuropsychological assessment, cognitive reserve estimation, BDNF and apolipoprotein E (ApoE) genotype analysis at baseline. Personality traits and leisure activities were assessed in a subgroup. Each patient underwent clinical–neuropsychological follow-up, during which 18 out of 48 SCD subjects progressed to MCI and 14 out of 26 MCI subjects progressed to AD. We found that Val66Met increased the risk of progression from SCD to MCI and from MCI to AD only in women. Nevertheless, Val/Val carriers who progressed from SCD to MCI had a shorter conversion time compared to Met carriers. We concluded that Val66Met polymorphism might play different roles depending on sex and stage of the disease.
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Abbreviations
- SCD:
-
Subjective cognitive decline
- CR:
-
Cognitive reserve
- HDRS:
-
Hamilton Depression Rating Scale
- TIB:
-
Test di Intelligenza Breve
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This research was funded by Ministero della Salute and Regione Toscana (Grants No GR-2010-2316359–Longitudinal clinical-neuropsychological study of subjective memory complaints) and Fondi Ricerca UNIFI 2018.
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All procedures involving experiments on human subjects have been done in accordance with the ethical standards of the Committee on Human Experimentation of the institution in which the experiments were done or in accordance with the Helsinki Declaration of 1975. Specific national laws have been observed.
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Bessi, V., Mazzeo, S., Bagnoli, S. et al. The implication of BDNF Val66Met polymorphism in progression from subjective cognitive decline to mild cognitive impairment and Alzheimer’s disease: a 9-year follow-up study. Eur Arch Psychiatry Clin Neurosci 270, 471–482 (2020). https://doi.org/10.1007/s00406-019-01069-y
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DOI: https://doi.org/10.1007/s00406-019-01069-y