X-linked TLR7 gene polymorphisms are associated with diverse immunological conditions but not with discoid lupus erythematosus in Polish patients.

INTRODUCTION

Toll-like receptor 7 (TLR7) is an important molecule involved in the development of autoimmunity and the response to different pathogens. Several polymorphisms within the gene were previously found to be associated with systemic lupus erythematosus (SLE). However, none of those studies investigated the promoter flanking variants rs1634318 and rs1616583. gene diversity has not been analyzed with respect to discoid lupus erythematosus (DLE) development, while its role in the human immunological response to fungal infection is not fully known.

AIM

To clarify the potential involvement of two novel single-nucleotide polymorphisms (SNPs) located in the gene (rs1634318 and rs1616583) in a variety of immune-related conditions, we studied the variability of these loci in patients from a Polish population with SLE and DLE, as well as in immunocompromised patients who were affected by invasive aspergillosis (IA) and those who were not affected.

MATERIAL AND METHODS

Real-time polymerase chain reaction was used to genotype SNPs. Statistically significant differences between case and control groups for both allele and genotype frequencies were assessed using the χ test with Yates' correction or two-tailed Fisher's exact test. The results were Bonferroni-corrected for multiple comparisons and odds ratios were calculated.

RESULTS

Two polymorphisms located in might be associated with the development of SLE but not DLE within the Polish population. Moreover, variation of the two investigated SNPs was found to be associated with IA in immunocompromised Polish patients.

CONCLUSIONS

In Polish patients, promoter flanking gene polymorphisms might be associated with IA and SLE but not DLE.