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CTLA-4 +49A/G and CT60 gene polymorphisms in primary Sjögren syndrome

Jacques-Eric Gottenberg1, Pascale Loiseau, Mariam Azarian

  • 1Rhumatologie, Institut Pour la Santé et la Recherche Médicale U802, Université Paris-Sud 11, Hôpital Bicêtre, 78 rue du Général Leclerc, Assistance Publique-Hôpitaux de Paris, 94275 Le Kremlin Bicêtre, France. jegotten@club-internet.fr

Arthritis Research & Therapy
|March 8, 2007
PubMed

Insights

This study investigated CTLA-4 gene polymorphisms and primary Sjögren syndrome (pSS) susceptibility. Results show no significant association between CTLA-4 CT60 or +49A/G polymorphisms and pSS risk, highlighting the need for replication studies.

Area of Science:

  • Immunogenetics
  • Autoimmune Diseases

Background:

  • Cytotoxic T lymphocyte-associated antigen-4 (CTLA-4) plays a crucial role in regulating T-cell activation.
  • CTLA-4 gene polymorphisms are implicated in autoimmune disease susceptibility, but findings are often population-specific and contradictory.
  • Primary Sjögren syndrome (pSS) is a chronic autoimmune disorder affecting exocrine glands.

Purpose of the Study:

  • To investigate the association between CTLA-4 gene polymorphisms (CT60 and +49A/G) and genetic predisposition to primary Sjögren syndrome (pSS).
  • To validate initial findings through a replication cohort study to ensure robustness and avoid sampling bias.

Main Methods:

  • A case-control study design was employed, analyzing CTLA-4 CT60 and +49A/G polymorphisms in two independent Caucasian cohorts of pSS patients and healthy controls.
  • Genotyping was performed on 142 patients and 241 controls in cohort 1, followed by replication in a second cohort of 139 patients.
  • Statistical analyses included allelic and genotypic distributions, calculating odds ratios (OR) and 95% confidence intervals (CI).

Main Results:

  • Cohort 1 showed a statistically significant association between the CTLA-4 +49A/G*A allele and pSS (p=0.036, OR=1.41).
  • No significant association was found for CTLA-4 CT60 polymorphisms in either cohort.
  • The replication cohort (cohort 2) did not confirm the association with the +49A/G*A allele (p=0.30, OR=0.85), and pooled analysis of both cohorts revealed no significant difference.
  • Sampling bias in cohort 1 may explain the initial positive finding.

Conclusions:

  • CTLA-4 CT60 and +49A/G polymorphisms are not significantly associated with the genetic predisposition to primary Sjögren syndrome (pSS).
  • Replication studies are essential to confirm initial findings and mitigate the impact of sampling bias in genetic association studies.
  • This study underscores the importance of large-scale, well-designed case-control studies in immunogenetics to avoid premature conclusions.

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