Effect of Met66 allele of the BDNF rs6265 SNP on regional gray matter volumes in patients with multiple sclerosis: A voxel-based morphometry study

Deepa P. Ramasamy, Murali Ramanathan, Jennifer L. Cox, Ronald Antulov, Bianca Weinstock-Guttman, Niels Bergsland, Ralph H B Benedict, Michael G. Dwyer, Alireza Minagar, Robert Zivadinov

Research output: Contribution to journalArticle

Abstract

The rs6265 single nucleotide polymorphism (SNP) is a genetic variation in the brain-derived neurotrophic factor (BDNF) gene wherein the presence of the A-allele at rs6265 causes replacement of a valine (Val) at position 66 by methionine (Met). We reported recently that the Met66 allele was associated with lower brain damage as evidenced by measurement of gray matter (GM) volume in multiple sclerosis (MS) patients. The objective of this study was to determine the voxel-wise regional GM differences between the Val66Val and Met66 allele groups in MS patients by using voxel-based morphometry (VBM)-optimized analysis corrected for lesion misclassification in Statistical Parametric Mapping (SPM5). High-resolution 3D-T1-weighted SPGR images from a total of 188 MS patients were acquired on a 1.5. T MRI. The Val66Val group included 129 MS patients and the Met66 allele group (comprised of Val66Met or Met66Met genotypes) included 59 MS patients. The SPM analysis of covariance tool was used to assess group differences after controlling for variation in head size, MS disease course and gender. VBM analysis did not yield significant family wise error (FWE) corrected results. This was also confirmed with the non-parametric analysis using threshold-free cluster enhancement (TFCE) method. However, the results from VBM as well as the TFCE analyses (p<0.001, uncorrected) showed higher GM volume in the cingulate of MS patients with Met66 allele than those with Val66Val. Future studies are warranted to investigate longitudinally possible protective role of the Met66 allele of the BDNF rs6265 SNP in relation to specific GM regions.

Original languageEnglish
Pages (from-to)53-60
Number of pages8
JournalPathophysiology
Volume18
Issue number1
DOIs
Publication statusPublished - Feb 2011

Keywords

  • BDNF
  • Gray matter
  • Hippocampus
  • Multiple sclerosis
  • Prefrontal cortex
  • Voxel-based morphometry

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Physiology (medical)

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    Ramasamy, D. P., Ramanathan, M., Cox, J. L., Antulov, R., Weinstock-Guttman, B., Bergsland, N., Benedict, R. H. B., Dwyer, M. G., Minagar, A., & Zivadinov, R. (2011). Effect of Met66 allele of the BDNF rs6265 SNP on regional gray matter volumes in patients with multiple sclerosis: A voxel-based morphometry study. Pathophysiology, 18(1), 53-60. https://doi.org/10.1016/j.pathophys.2010.04.006