Effects of the BDNF Val66Met polymorphism and met allele load on declarative memory related neural networks

Chris M Dodds, Richard N Henson, John Suckling, Kamilla W Miskowiak, Cinly Ooi, Roger J Tait, Fruzsina Soltesz, Philip Lawrence, Graham D Bentley, Kay Maltby, Andrew L Skeggs, Sam R Miller, Simon McHugh, Edward Bullmore, Pradeep Jonathan Nathan

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Abstract

It has been suggested that the BDNF Val66Met polymorphism modulates episodic memory performance via effects on hippocampal neural circuitry. However, fMRI studies have yielded inconsistent results in this respect. Moreover, very few studies have examined the effect of met allele load on activation of memory circuitry. In the present study, we carried out a comprehensive analysis of the effects of the BDNF polymorphism on brain responses during episodic memory encoding and retrieval, including an investigation of the effect of met allele load on memory related activation in the medial temporal lobe. In contrast to previous studies, we found no evidence for an effect of BDNF genotype or met load during episodic memory encoding. Met allele carriers showed increased activation during successful retrieval in right hippocampus but this was contrast-specific and unaffected by met allele load. These results suggest that the BDNF Val66Met polymorphism does not, as previously claimed, exert an observable effect on neural systems underlying encoding of new information into episodic memory but may exert a subtle effect on the efficiency with which such information can be retrieved.
Original languageEnglish
Article numbere74133
Number of pages9
JournalPLoS ONE
Volume8
Issue number11
DOIs
Publication statusPublished - 2013

Cite this

Dodds, C. M., Henson, R. N., Suckling, J., Miskowiak, K. W., Ooi, C., Tait, R. J., Soltesz, F., Lawrence, P., Bentley, G. D., Maltby, K., Skeggs, A. L., Miller, S. R., McHugh, S., Bullmore, E., & Nathan, P. J. (2013). Effects of the BDNF Val66Met polymorphism and met allele load on declarative memory related neural networks. PLoS ONE, 8(11), [e74133]. https://doi.org/10.1371/journal.pone.0074133