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Gain-of-function of P2X7 receptor gene variants in multiple sclerosis

Olatz Oyanguren-Desez1, Alfredo Rodríguez-Antigüedad, Pablo Villoslada

  • 1Centro de Investigaciones Biomédicas en Red Enfermedades Neurodegenerativas (CIBERNED) and Departamento de Neurociencias, Universidad del País Vasco, Leioa, Spain.

Cell Calcium
|September 13, 2011
PubMed

Insights

Genetic variations in the P2X7 receptor gene are linked to multiple sclerosis (MS). A specific P2X7 receptor variant (rs17525809 T allele) increases the risk of developing MS due to enhanced cellular function.

Area of Science:

  • Neuroimmunology
  • Genetics
  • Cellular Physiology

Background:

  • The P2X7 receptor plays a role in oligodendrocyte function and experimental autoimmune encephalomyelitis.
  • Understanding genetic predispositions for multiple sclerosis (MS) is crucial for its pathophysiology.

Purpose of the Study:

  • To investigate the association between single nucleotide polymorphisms (SNPs) in the P2X7 receptor gene and MS.
  • To characterize the functional impact of identified P2X7 receptor variants.

Main Methods:

  • Case-control study comparing P2X7 receptor gene polymorphisms in MS patients and healthy controls.
  • Functional assays evaluating calcium permeability, electrophysiological responses, and ethidium uptake of P2X7 receptor variants.

Main Results:

  • The T allele of the rs17525809 polymorphism, leading to an Ala-76 to Val change, was more frequent in MS patients.
  • P2X7 receptor variants with Val exhibited gain-of-function properties, including increased calcium permeability and enhanced cellular responses.
  • This gain-of-function was further amplified in combination with the rs208294 polymorphism (His-155 to Tyr).

Conclusions:

  • Specific P2X7 receptor gene polymorphisms are associated with an increased risk of multiple sclerosis.
  • Gain-of-function variants of the P2X7 receptor may contribute to the pathophysiology of MS.
  • These findings offer insights into the genetic background predisposing individuals to MS.

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