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KIBRA polymorphism is related to enhanced memory and elevated hippocampal processing.

Karolina Kauppi1, Lars-Göran Nilsson, Rolf Adolfsson

  • 1Department of Integrative Medical Biology (Physiology) and Umeå Center for Functional Brain Imaging, Umeå University, 90187 Umeå, Sweden. Karolina.kauppi@physiol.umu.se

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 7, 2011
PubMed
Summary

The KIBRA gene variant (rs17070145 T allele) is linked to better episodic memory. This study found T allele carriers show higher hippocampal activation, not neural compensation in non-carriers.

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Area of Science:

  • Neuroscience
  • Genetics
  • Cognitive Psychology

Background:

  • The KIBRA rs17070145 T allele polymorphism has been associated with enhanced episodic memory in healthy individuals.
  • Previous research suggested that non-carriers of the T allele might exhibit increased hippocampal activation to compensate for lower memory performance.

Purpose of the Study:

  • To replicate the association between the KIBRA rs17070145 polymorphism and episodic memory.
  • To investigate the neural mechanisms underlying this association, specifically hippocampal activation patterns during episodic memory retrieval.

Main Methods:

  • Large-scale behavioral study (N = 2230) and functional magnetic resonance imaging (fMRI) study (N = 83).
  • Episodic memory performance was assessed, and hippocampal activation was measured during retrieval tasks.
  • Post hoc matching was performed on fMRI data based on performance, sex, and age (N = 64).

Main Results:

  • The KIBRA T allele was replicated to be associated with superior episodic memory performance.
  • Contrary to previous findings, T allele carriers demonstrated increased hippocampal activation during episodic retrieval.
  • No evidence of compensatory hippocampal activation was found in non-carriers.

Conclusions:

  • Enhanced episodic memory performance in KIBRA T allele carriers is associated with elevated hippocampal functioning.
  • The findings challenge the notion of neural compensation in non-carriers and highlight the role of increased hippocampal activity in carriers for superior memory.