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CYP2D6 polymorphism is not associated with essential tremor

J A Agúndez1, F J Jiménez-Jiménez, R Tejeda

  • 1Department of Pharmacology and Psychiatry, Medical School, University of Extremadura, Badajoz, Spain.

European Neurology
|January 1, 1997
PubMed
Summary

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Genetic variations in cytochrome P450IID6 (CYP2D6) are not a significant risk factor for developing essential tremor (ET). This study suggests essential tremor and parkinsonism are distinct neurological conditions.

Area of Science:

  • Genetics
  • Neurology
  • Pharmacogenomics

Background:

  • Recent studies suggest a link between cytochrome P450IID6 (CYP2D6) gene polymorphism and Parkinson's disease.
  • Essential tremor (ET) is a common neurological disorder, and its genetic underpinnings are not fully understood.

Purpose of the Study:

  • To investigate the potential association between CYP2D6 genetic variants and the risk of developing essential tremor.
  • To differentiate the genetic factors contributing to ET compared to Parkinson's disease.

Main Methods:

  • Genotyping of eight common CYP2D6 allelic variants was performed using allele-specific PCR and RFLP analyses.
  • DNA was analyzed from 91 unrelated ET patients and 258 unrelated healthy controls.
  • Prevalence of allelic variants and individuals with absent CYP2D6 activity were compared between groups.

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Main Results:

  • No significant differences in the prevalence of CYP2D6 allelic variants were observed between ET patients and controls.
  • The prevalence of individuals with absent CYP2D6 activity was lower in the ET group (1.1%) compared to the control group (3.1%).
  • Both ET and control groups were in Hardy-Weinberg equilibrium for the studied variants.

Conclusions:

  • CYP2D6 gene mutations do not appear to be a major determinant of susceptibility to essential tremor.
  • These findings support the distinction between essential tremor and parkinsonism as separate conditions with different genetic etiologies.