Abstract
A common Single-Nucleotide Polymorphism in the Brain-Derived Neurotrophic Factor (BDNF) gene coding the Val66Met substitution in the pro-BDNF protein has been associated with a number of behavioural and neuroanatomical phenotypes; the latter include, for example, regional differences in volumes of the hippocampus and prefrontal grey matter. Here, we show that the observed regional differences may not stem from a localised effect of this gene. Our analysis of regional brain volume in a cohort of 331 adolescents indicates that the Val66Met substitution has a global effect on brain volume, and that the observed local differences are to be expected if brain allometry—the covariance pattern of regional brain volumes—is taken into account.
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Acknowledgments
The Saguenay Youth Study project is funded by the Canadian Institutes of Health Research, Heart and Stroke Foundation of Quebec, and the Canadian Foundation for Innovation. We thank Pierre-Yves Hervé and Jamila Andoh for their comments on the manuscript, and the following individuals for their contribution in designing the protocol, acquiring and analysing the data: MR team (Dr. Michel Bérubé, Sylvie Masson, Suzanne Castonguay, Julien Grandisson, Marie-Josée Morin) and the ÉCOBES team (Nadine Arbour, Marie-Ève Bouchard, Annie Houde, Dr. Luc Laberge). We thank Dr. Jean Mathieu for the medical follow-up of subjects in whom we detected any medically relevant abnormalities.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00429-009-0224-6
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Toro, R., Chupin, M., Garnero, L. et al. Brain volumes and Val66Met polymorphism of the BDNF gene: local or global effects?. Brain Struct Funct 213, 501–509 (2009). https://doi.org/10.1007/s00429-009-0203-y
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DOI: https://doi.org/10.1007/s00429-009-0203-y