Association of polymorphous light eruption with NOD-2 and TLR-5 gene polymorphisms

Area of Science:

• Immunogenetics
• Dermatology
• Transplantation Immunology

Background:

• Polymorphous light eruption (PLE) is a common photosensitive skin disease.
• Reduced epidermal Langerhans cell (LC) depletion after UV-B irradiation in PLE patients creates a non-suppressive skin microenvironment.
• Severe acute graft-versus-host disease (aGvHD) is linked to incomplete LC depletion post-UVB, with genetic variations in NOD-2 and TLR-5 genes conferring susceptibility.

Purpose of the Study:

• To investigate the association between genetic variations in the NOD-2 and TLR-5 genes and polymorphous light eruption (PLE).

Main Methods:

• Single-nucleotide polymorphisms (SNPs) in NOD-2 (R702W, G908R, 3020Cins) and TLR-5 (A592S, P616L, N392STOP) were analyzed.
• Skin biopsies from 143 PLE patients and 104 healthy controls were used.
• Restriction fragment length polymorphism analysis was employed.

Main Results:

• Significantly higher frequencies of NOD-2 alleles (SNP R702W, SNP 3020Cins) were observed in PLE patients compared to controls.
• The TLR-5 gene's N392STOP SNP, linked to a non-functional receptor, was also significantly more frequent in PLE patients.
• No significant differences were found for other tested SNPs.

Conclusions:

• Functional SNPs in NOD-2 and TLR-5 genes are highly prevalent in PLE patients.
• These SNPs are also associated with aGvHD, and similarities exist in LC responses to UV-B irradiation between aGvHD and PLE.
• This suggests a potential increased susceptibility to GvHD in PLE patients post-stem cell transplantation, warranting further investigation.