Synergistic effects of the dopaminergic and glutamatergic system on hippocampal volume in alcohol-dependent patients

I. Puls, J. Mohr, J. Wrase, J. Priller, J. Behr, W. Kitzrow, N. Makris, H. C. Breiter, K. Obermayer, A. Heinz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Several genes of the dopaminergic and glutamatergic neurotransmitter systems have been found to be associated with alcohol disease and related intermediate phenotypes. Here, we evaluated genetic variants of the catechol-O-methyltransferase (COMT) and the metabotropic glutamate receptor 3 (mGluR3) genes in alcohol-dependent patients and their association with volumetric measurements of brain structures. By combined analysis of imaging data and genotyping results, large numbers of variables are produced that overstrain conventional statistical methods based on tests for group differences. Limitations in assessment of epistatic effects and multiple testing problems are encountered. Therefore, we introduce a novel method for detecting associations between a set of genetic markers and phenotypical measurements based on machine learning techniques. Hippocampal volume was found to be associated with epistatic effects of the COMT-mGluR3 genes in alcohol-dependent patients but not in controls. These data are in line with prior studies supporting a role for dopamine-glutamate interaction in modulation of alcohol disease.

Original languageEnglish (US)
Pages (from-to)126-136
Number of pages11
JournalBiological Psychology
Volume79
Issue number1
DOIs
StatePublished - Sep 2008

Keywords

  • Alcohol addiction
  • COMT
  • Dopamine
  • Glutamate
  • Hippocampal volume
  • Machine learning
  • P-SVM
  • Variable selection
  • mGluR3

ASJC Scopus subject areas

  • Neuroscience(all)
  • Neuropsychology and Physiological Psychology

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