[Association of single nucleotide polymorphism in M-type phospholipase A2 receptor gene with membranous nephropathy]

Area of Science:

• Nephrology
• Genetics
• Immunology

Background:

• Membranous nephropathy (MN) is a leading cause of nephrotic syndrome in adults.
• The M-type phospholipase A2 receptor (PLA2R) is a key target antigen in idiopathic MN (IMN).
• Genetic factors influencing PLA2R and its role in IMN pathogenesis require further investigation.

Purpose of the Study:

• To investigate the association between a specific single nucleotide polymorphism (SNP) in the PLA2R gene (rs35771982) and MN in a Chinese Han population.
• To explore the correlation between this PLA2R SNP and clinical characteristics, including serum anti-PLA2R antibody levels and disease severity.

Main Methods:

• A case-control study involving 430 Chinese Han individuals (145 IMN patients, 53 secondary MN patients, 232 controls).
• Genotyping of the PLA2R rs35771982 polymorphism using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).
• Detection of serum anti-PLA2R antibodies via Western blotting.

Main Results:

• Significant differences in genotypic and allelic frequencies of rs35771982 were observed among the groups (P=0.004 and P<0.001, respectively).
• The CC genotype and C allele were more prevalent in IMN patients (both idiopathic and secondary) compared to normal controls (P=0.002 and P<0.001 for CC vs NC; P=0.011 and P=0.001 for CC vs secondary MN).
• In IMN patients, the CC genotype correlated with lower serum albumin, higher 24-hour urine protein, and a higher rate of positive anti-PLA2R antibodies (P<0.001 for all). The CC genotype was identified as a risk factor for IMN (OR=8.927, P=0.003).

Conclusions:

• The CC genotype and C allele at PLA2R rs35771982 are associated with susceptibility to IMN in the Chinese Han population.
• The association of the CC genotype with IMN severity and anti-PLA2R antibody levels suggests a role for this genetic locus in autoantibody production.
• These findings highlight the importance of the PLA2R gene rs35771982 polymorphism in the pathogenesis of IMN.