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Examining the association between serum galactose-deficient IgA1 and primary IgA nephropathy: a systematic review and meta-analysis
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Examining the association between serum galactose-deficient IgA1 and primary IgA nephropathy: a systematic review and meta-analysis
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Journal Article
Examining the association between serum galactose-deficient IgA1 and primary IgA nephropathy: a systematic review and meta-analysis
2024
Overview
Background
IgA nephropathy (IgAN) is a common primary glomerular disease. The
O
-glycosylation status of IgA1 plays a crucial role in disease pathophysiology. The level of poorly-
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-galactosylated IgA1, or galactose-deficient IgA1 (Gd-IgA1), has also been identified as a potential biomarker in IgAN. We sought to examine the value of serum Gd-IgA1 as a biomarker in IgAN, by investigating its association with clinical, laboratory, and histopathological features of IgAN.
Methods
The review followed Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) recommendations and was registered in PROSPERO (CRD42021287423). The literature search was conducted in PubMed, Web of Science, Cochrane, and Scopus, and the selected articles were evaluated for eligibility based on predefined criteria. The methodological quality of the studies was assessed using the Newcastle–Ottawa Scale. Statistical analysis was performed to calculate effect sizes and assess heterogeneity among the studies.
Results
This review analyzed 29 out of 1,986 studies, conducted between 2005 and 2022, with participants from multiple countries. Gd-IgA1 levels were not associated with age and gender, while associations with hypertension, hematuria, and proteinuria were inconsistent. In the meta-analyses, a correlation between serum Gd-IgA1 and estimated glomerular filtration rate was identified, however, the relationships between Gd-IgA1 levels and chronic kidney disease (CKD) stage and progression to kidney failure were inconsistent.
Conclusions
Serum Gd-IgA1 levels were not associated with validated prognostic risk factors, but were negatively correlated with kidney function. Further research in larger studies using standardized assays are needed to establish the value of Gd-IgA1 as a prognostic risk factor in IgAN.
Graphical abstract
