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A PD-1 polymorphism is associated with disease progression in multiple sclerosis.
Antje Kroner1, Matthias Mehling, Bernhard Hemmer
1Clinical Research Group for Multiple Sclerosis and Neuroimmunology, Department of Neurology, Bayerische Julius-Maximilians Universität, Würzburg, Germany.
Annals of Neurology
|May 25, 2005
Summary
A specific gene variant in Programmed Death 1 (PD-1) is linked to multiple sclerosis (MS) progression. This PD-1 polymorphism may impair T-cell inhibition, potentially worsening MS disease course.
Area of Science:
- Immunology
- Genetics
- Neurology
Background:
- T cells are crucial in self-reactive immune responses in multiple sclerosis (MS).
- Programmed Death 1 (PD-1) is a costimulatory molecule that inhibits T cell function.
- A specific intronic polymorphism in the PD-1 gene (7146G/A) has been linked to autoimmunity.
Purpose of the Study:
- To investigate if the PD-1 7146G/A polymorphism acts as a genetic modifier for the risk and progression of MS.
- To assess the impact of this polymorphism on T cell function ex vivo.
Main Methods:
- Genotyping of the PD-1 7146G/A polymorphism in 939 German MS patients and 272 healthy controls using polymerase chain reaction and restriction enzyme digestion.
- Confirmation of results by automatic sequencing.
- Ex vivo assessment of T cell cytokine secretion (interferon-gamma) in patients with the polymorphism.
Main Results:
- A significant association was found between the mutated PD-1 allele (7146A) and a progressive disease course in MS patients (p = 0.002).
- Patients carrying the PD-1 polymorphism exhibited impaired PD-1-mediated inhibition of T cell cytokine secretion (interferon-gamma).
Conclusions:
- The PD-1 7146G/A polymorphism appears to be a genetic modifier influencing the progression of multiple sclerosis.
- This modification may occur through a partial defect in PD-1-mediated inhibition of T cell activation, impacting disease severity.