Quantitative Glycoproteomics Reveals Distinctive N‑Glycosylation Patterns in Human Kidney Tissues with Minor Glomerular Abnormalities

Kidney diseases present substantial clinical challenges, with aberrant glycoproteins emerging as key pathogenic drivers. Minor glomerular abnormalities (MGAs), a category of unclassified glomerular lesions defined by subtle structural changes, are commonly detected in patients with persistent, asymptomatic, isolated proteinuria or microhematuria. Still their site-specific N-glycosylation patterns remain unexplored. To address this gap, a laboratory-developed pressure cycling technology-based quantitative glycoproteomics workflow was applied to compare intact N-glycopeptides (IGPs) among distant non-neoplastic tissues (DNTs; n = 24) and trace renal biopsy samples from MGA patients (n = 27). Integrated with high-resolution mass spectrometry, 672 upregulated IGPs (FC > 1.5, p p N-glycosylation analysis further revealed distinct patterns among IgG subclasses and complement-related markers that distinguish MGA from DNT, offering new mechanistic insights into MGA pathogenesis. These novel glyco-signatures clarify the role of N-glycosylation in renal disease and validate this workflow as a powerful tool for trace-tissue analysis. This study lays the groundwork for translating N-glycosylation findings into clinical applications to improve MGA diagnosis and management.