While many previous studies have reported an association between the single-nucleotide polymorphisms (SNPs) of the
podocin and
proteinuria occurred, a conclusive relationship has not been defined in every oligoallelic state of
amino acid (AA) mutations in
podocin. In this study, we performed a meta-analysis of the published data to investigate the impact of the oligoallelic AA mutations of the
podocin on
proteinuria; a total 16 AA mutations were investigated for oligoallelic pathogenicity. Despite significant heterogeneity within some of the comparisons, the results revealed significantly higher risks of
proteinuria in early-onset (onset age <16) individuals for five mutations (P118L, R138Q, R168H, V180M, and V260E), and in all onset ages individuals for five mutations (R138Q, G140X, R229Q, V260E, and V290M) compared to non-variant individuals. We also tested the
steroid response in individuals with R229Q and E237Q. No statistically significant differences in the two mutations carrier rate were observed between
steroid resistance patients and controls. No AA mutation was selected for meta-analysis on the recurrence of
proteinuria after
renal transplantation as lack of control data. In conclusion, our meta-analysis tested the pathogenicity of the oligoallelic AA mutations in
podocin and suggested the potential causative mutations, and the alleles showing an association with
protein susceptibility. The sensitivity and specificity of each causative mutation are pending further testing.