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  • Original Research Article
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M129V variation in the prion protein may influence cognitive performance

Abstract

Correlations between general intelligence (g) and brain volume are about 0.40, and the correlation between g and white matter volume has been reported to be largely due to genetic factors. Establishing that the correlation between brain volumes and cognitive abilities is mediated by shared genetic factors is only the first step in unveiling the relation between them. We have recently shown that methionine at codon 129 in the prion protein is associated with white matter reduction in a group of healthy volunteers and schizophrenic patients. The present study examines the influence of the same genetic variation on psychometric cognitive performance measurements in 335 community-based healthy volunteers. The polymorphism was associated with Full Scale IQ (genotype: F=4.38, df=2/317, P=0.013; allele: F=8.04, df=1/658, P=0.005), as measured by HAWIE-R (German version of the Wechsler Adult Intelligence Scale, Revised). Genotype accounted for 2.7% of the total variability in Full Scale IQ (partial η2=0.027). An exploratory analysis revealed association with several HAWIE-R subscales; the association with the Digit Symbol subtest remained significant after correction for multiple testing. In summary, we deliver evidence for an association of a common genetic variation in the prion protein gene with cognitive performance. However, independent replications are needed before firm conclusions can be drawn.

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Acknowledgements

We thank Stephany Fulda for helpful discussions. Parts of this work are taken from the MD thesis of Tanja Schulz.

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Correspondence to D Rujescu.

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Rujescu, D., Hartmann, A., Gonnermann, C. et al. M129V variation in the prion protein may influence cognitive performance. Mol Psychiatry 8, 937–941 (2003). https://doi.org/10.1038/sj.mp.4001327

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