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Paraoxonase gene polymorphisms and sporadic ALS.

A Slowik1, B Tomik, P P Wolkow

  • 1Department of Neurology, Jagiellonian University, Botaniczna 3, 31-503 Krakow, Poland. slowik@cm-uj.krakow.pl

Neurology
|July 11, 2006
PubMed
Summary

Genetic variants in paraoxonase 1 and 2 genes are linked to sporadic ALS risk. Specific PON1 and PON2 polymorphisms, including the R-C haplotype, were significantly associated with sporadic ALS in a Polish population.

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Area of Science:

  • Genetics
  • Neuroscience
  • Biochemistry

Background:

  • The human paraoxonase (PON) gene family, comprising PON1, PON2, and PON3, is located on chromosome 7.
  • PON gene variants may influence enzyme activity.
  • Environmental factors and chemical exposures metabolized by paraoxonases could be risk factors for sporadic ALS (sALS).

Purpose of the Study:

  • To investigate the association between functional polymorphisms in PON1 (Q192R, L55M) and PON2 (C311S) and the risk of developing sALS.
  • The study focused on a Polish population.

Main Methods:

  • Case-control study design involving 185 sALS patients and 437 healthy controls.
  • Genotyping of paraoxonase polymorphisms was performed using Polymerase Chain Reaction (PCR) and restriction enzyme digestion.
  • Logistic regression and haplotype analyses were employed to assess associations.

Main Results:

  • The C allele of the PON2 C311S polymorphism showed association with sALS in dominant and additive models.
  • The R allele of the PON1 Q192R polymorphism was associated with sALS in recessive, additive, and dominant models.
  • The R-C haplotype was significantly overrepresented in sALS cases compared to controls (OR=3.44, p=0.002).

Conclusions:

  • Specific amino acid variants in PON1 and PON2 genes are associated with an increased risk of sporadic ALS.
  • These findings highlight the potential role of paraoxonase gene polymorphisms in sALS pathogenesis within the studied population.