Plasma protein N-glycan signatures of type 2 diabetes

Abstract Background Little is known about enzymatic N- glycosylation in type 2 diabetes, a common posttranslational modification of proteins influencing their function and integrating genetic and environmental influences. We sought to gain insights into N -glycosylation to uncover yet unexplored pathophysiological mechanisms in type 2 diabetes. Methods Using a high-throughput MALDI-TOF mass spectrometry method, we measured N- glycans in plasma samples of the DiaGene case-control study (1583 cases and 728 controls). Associations were investigated with logistic regression and adjusted for age, sex, body mass index, high-density lipoprotein-cholesterol, non-high-density lipoprotein-cholesterol, and smoking. Findings were replicated in a nested replication cohort of 232 cases and 108 controls. Results Eighteen glycosylation features were significantly associated with type 2 diabetes. Fucosylation and bisection of diantennary glycans were decreased in diabetes (odds ratio (OR) = 0.81, p  = 1.26E-03, and OR = 0.87, p  = 2.84E-02, respectively), whereas total and, specifically, alpha2,6-linked sialylation were increased (OR = 1.38, p  = 9.92E-07, and OR = 1.40, p  = 5.48E-07). Alpha2,3-linked sialylation of triantennary glycans was decreased (OR = 0.60, p  = 6.38E-11). Conclusions While some glycosylation changes were reflective of inflammation, such as increased alpha2,6-linked sialylation, our finding of decreased alpha2,3-linked sialylation in type 2 diabetes patients is contradictory to reports on acute and chronic inflammation. Thus, it might have previously unreported immunological implications in type 2 diabetes. General significance This study provides new insights into N -glycosylation patterns in type 2 diabetes, which can fuel studies on causal mechanisms and consequences of this complex disease.