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Updated: Nov 2, 2025

Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
Published on: June 8, 2022
Variants in BANK1 are associated with lupus nephritis of European ancestry
Karin Bolin1, Juliana Imgenberg-Kreuz1, Dag Leonard1
1Department of Medical Sciences and Science for Life Laboratory, Uppsala University, Uppsala, Sweden.
Insights
Genetic variations in BANK1 are linked to lupus nephritis (LN), a kidney complication of SLE. This study identifies BANK1 as a potential factor in LN development, highlighting its role in disease pathogenesis.
Area of Science:
- Genetics
- Immunology
- Nephrology
Background:
- The genetic underpinnings of lupus nephritis (LN), a severe manifestation of systemic lupus erythematosus (SLE), remain incompletely understood.
- Identifying genetic factors associated with LN is crucial for understanding its pathogenesis and developing targeted therapies.
Purpose of the Study:
- To investigate the genetic associations with lupus nephritis (LN) in a large cohort of SLE patients.
- To explore the role of genetic variations, specifically in the BANK1 gene, in LN pathogenesis and its regulation by DNA methylation.
Main Methods:
- A case-only study design involving 2886 SLE patients, with 947 diagnosed with LN.
- Genotyping was performed using Immunochip and a custom array across discovery and replication cohorts (Sweden, US, Denmark/Norway).
- DNA methylation data was analyzed to identify methylation quantitative trait loci (meQTL) effects.
Main Results:
- Six loci, including BANK1, were initially associated with LN in the discovery cohort.
- BANK1 variants showed a significant association with LN across meta-analyses of multiple cohorts (p = 2.2 × 10-7).
- DNA methylation data revealed meQTL effects between CpG sites and BANK1 variants in LN patients.
Conclusions:
- Genetic variations in the BANK1 gene are significantly associated with lupus nephritis (LN).
- Evidence suggests that DNA methylation within the BANK1 locus is genetically regulated, indicating a functional role for BANK1 in LN.
- The study highlights BANK1 as a key genetic factor contributing to the pathogenesis of lupus nephritis.
Abstract:
The genetic background of lupus nephritis (LN) has not been completely elucidated. We performed a case-only study of 2886 SLE patients, including 947 (33%) with LN. Renal biopsies were available from 396 patients. The discovery cohort (Sweden, n = 1091) and replication cohort 1 (US, n = 962) were genotyped on the Immunochip and replication cohort 2 (Denmark/Norway, n = 833) on a custom array. Patients with LN, proliferative nephritis, or LN with end-stage renal disease were compared with SLE without nephritis. Six loci were associated with LN (p < 1 × 10-4, NFKBIA, CACNA1S, ITGA1, BANK1, OR2Y, and ACER3) in the discovery cohort. Variants in BANK1 showed the strongest association with LN in replication cohort 1 (p = 9.5 × 10-4) and proliferative nephritis in a meta-analysis of discovery and replication cohort 1. There was a weak association between BANK1 and LN in replication cohort 2 (p = 0.052), and in the meta-analysis of all three cohorts the association was strengthened (p = 2.2 × 10-7). DNA methylation data in 180 LN patients demonstrated methylation quantitative trait loci (meQTL) effects between a CpG site and BANK1 variants. To conclude, we describe genetic variations in BANK1 associated with LN and evidence for genetic regulation of DNA methylation within the BANK1 locus. This indicates a role for BANK1 in LN pathogenesis.
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