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Association between a CTGF gene polymorphism and systemic sclerosis in a French population
Brigitte Granel1, Laurent Argiro, Eric Hachulla
1INSERM, U906, (Institut Nationale de la Santé et de la Recherche Médicale), Laboratoire d'Immunologie et de Génétique des Maladies Parasitaires, Faculté de Médecine, Université de la Méditerranée (UM) Service de Médecine Interne, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille (AP-HM), UM, Marseille, France. brigitte.granel@univmed.fr
Genetic variations in the CTGF gene, specifically the rs9399005 SNP, may influence susceptibility to systemic sclerosis (SSc), a fibrotic autoimmune disease. This finding offers new insights into SSc pathogenesis.
Area of Science:
- Genetics
- Immunology
- Dermatology
Background:
- Systemic sclerosis (SSc) is a severe autoimmune disorder marked by widespread fibrosis.
- Connective tissue growth factor (CTGF) is a key mediator implicated in fibrotic processes.
Purpose of the Study:
- To investigate the association between 7 single-nucleotide polymorphisms (SNPs) in the CTGF gene and scleroderma risk in a French population.
- To explore the functional impact of identified SNPs on CTGF gene expression.
Main Methods:
- A case-control study involving 241 SSc patients and 269 controls.
- Genotyping of 7 SNPs using TaqMan system, followed by univariate and multivariate analyses.
- In silico electrophoretic mobility shift assay (EMSA) and RT-PCR to assess SNP effects on gene expression.
Main Results:
- The rs9399005 TT genotype was less frequent in SSc patients, an association independent of gender.
- The rs9399005 SNP was linked to both diffuse and limited cutaneous SSc forms.
- EMSA indicated differential nuclear factor binding affinity for the T and C alleles of rs9399005, suggesting altered CTGF mRNA structure.
Conclusions:
- CTGF gene polymorphisms, particularly rs9399005, may play a role in systemic sclerosis susceptibility.
- These genetic variations could influence disease risk and potentially impact CTGF gene regulation.
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