Neurological Sciences

, Volume 40, Issue 8, pp 1559–1566 | Cite as

KIBRA T allele influences memory performance and progression of cognitive decline: a 7-year follow-up study in subjective cognitive decline and mild cognitive impairment

  • Salvatore Mazzeo
  • Valentina Bessi
  • Sonia Padiglioni
  • Silvia Bagnoli
  • Laura Bracco
  • Sandro Sorbi
  • Benedetta NacmiasEmail author
Original Article


KIBRA is a signal transducer protein, mainly expressed in the kidney and brain. A single-nucleotide polymorphism (SNP rs17070145, T → C exchange) has been linked to different cognitive function. In 2008, we studied 70 subjects who complained of subjective cognitive decline (SCD) and found that CT/TT carriers performed worse than CC carriers on a long-term memory test. We followed up the 70 SCD subjects and also 31 subjects affected by mild cognitive impairment (MCI) for a mean follow-up time of 7 years, during which 16 SCD subjects progressed to MCI and 14 MCI subjects progressed to Alzheimer’s disease (AD). Carrying the T allele was associated with MCI and with a two times-higher risk of developing MCI than CC carriers. In the SCD sample, CT/TT carriers showed a greater worsening on Rivermead Behavioral Memory Test (RBMT) compared to CC carriers. In the MCI sample, CT/TT carriers performed worse than CC carriers on RBMT. There is a lack of consensus on the effect of KIBRA gene variants on cognitive performances in episodic memory and on the risk of AD. Our results confirm a role of T allele on progression of cognitive decline.


Alzheimer’s disease Subjective cognitive decline Mild cognitive impairment KIBRA ApoE Neuropsychology 



Subjective cognitive decline


Rivermead Behavioral Memory Test


Hamilton Depression Rating Scale


Funding information

This research was funded by Ministero della Salute and Regione Toscana (grant nos. GR-2010-2316359-Longitudinal clinical-neuropsychological study of subjective memory complaints) and Fondi Ricerca UNIFI 2018.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical standards

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.

Supplementary material

10072_2019_3866_MOESM1_ESM.docx (27 kb)
ESM 1 (DOCX 27 kb)


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Copyright information

© Fondazione Società Italiana di Neurologia 2019

Authors and Affiliations

  • Salvatore Mazzeo
    • 1
  • Valentina Bessi
    • 1
  • Sonia Padiglioni
    • 1
  • Silvia Bagnoli
    • 1
  • Laura Bracco
    • 1
  • Sandro Sorbi
    • 1
    • 2
  • Benedetta Nacmias
    • 1
    Email author
  1. 1.Department of Neuroscience, Psychology, Drug Research and Child HealthUniversity of FlorenceFlorenceItaly
  2. 2.IRCCS Fondazione Don Carlo GnocchiFlorenceItaly

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