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Genetic variants in ANCA-associated vasculitis: a meta-analysis
Chinar Rahmattulla1, Antien L Mooyaart1, Daphne van Hooven1
1Department of Pathology, Leiden University Medical Centre, Leiden, The Netherlands.
Annals of the Rheumatic Diseases
|October 8, 2015
Summary
This study identified 33 genetic variants linked to antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV). Genetic differences are more pronounced when classifying AAV by ANCA serotype than by clinical diagnosis.
Area of Science:
- Genetics
- Immunology
- Rheumatology
Background:
- Genetic factors are implicated in the development of antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV).
- Understanding the genetic underpinnings of AAV is crucial for elucidating its pathogenic pathways.
- Investigating genetic distinctions between AAV subtypes may reveal specific disease mechanisms.
Purpose of the Study:
- To conduct a meta-analysis to identify genetic variants associated with AAV.
- To determine if diagnostic and serological subtypes of AAV possess distinct genetic backgrounds.
- To enhance the understanding of AAV pathogenesis through genetic association studies.
Main Methods:
- A comprehensive literature search was performed across PubMed, EMBASE, and Web of Science for studies on genetic variants and AAV.
- Variants investigated in at least two studies were selected for meta-analysis.
- Data from large-scale genome-wide association studies in AAV were incorporated to bolster the meta-analysis's validity.
Main Results:
- The meta-analysis included 62 articles and 140 genetic variants, identifying 33 variants significantly associated with AAV.
- Associated genetic variants are located in or near genes including CD226, CTLA-4, FCGR2A, HLA-B, HLA-DP, HLA-DQ, HLA-DR, HSD17B8, IRF5, PTPN22, RING1/RXRB, RXRB, STAT4, SERPINA1, and TLR9.
- Genetic distinctions were found between granulomatosis with polyangiitis and microscopic polyangiitis, and between proteinase 3 ANCA vasculitis and myeloperoxidase ANCA vasculitis, with ANCA serotype-based subdivisions showing stronger genetic associations.
Conclusions:
- Thirty-three genetic variants associated with AAV were identified, highlighting the roles of alpha-1-antitrypsin, the major histocompatibility complex system, and inflammatory pathways in AAV.
- Subdividing AAV based on ANCA serotype demonstrates a more robust genetic basis compared to subdivision based on clinical diagnosis.
- These findings provide valuable insights into the genetic architecture of AAV and its subtypes.
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