Causal relationship between beta-2 microglobulin and B-cell malignancies: genome-wide meta-analysis and a
Jiuling Li1, Yao Wu1, Xin Zhang1
1Department of Pathology, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China.
Frontiers in Immunology
|October 22, 2024
Summary
Elevated beta-2 microglobulin (β2M) levels increase the risk of diffuse large B-cell lymphoma (DLBCL) and Hodgkin lymphoma (HL). This association may stem from innate immune system dysfunction, with no evidence of B-cell malignancies causing higher β2M.
Area of Science:
- Genetics and Immunology
- Cancer Epidemiology
- Biomarker Research
Background:
- Beta-2 microglobulin (β2M) is a known prognostic biomarker in B-cell malignancies.
- Limited understanding exists regarding the causal relationship between β2M levels and the risk of developing B-cell malignancies.
Purpose of the Study:
- To investigate the potential causal relationship between beta-2 microglobulin (β2M) and the risk of B-cell malignancies.
- To explore the underlying biological pathways connecting β2M and B-cell malignancies.
Main Methods:
- Genome-wide meta-analysis (GWMA) to identify genetic variants associated with β2M.
- Bidirectional two-sample Mendelian randomization (TSMR) analysis to assess causality.
- Pathway enrichment analysis to elucidate biological mechanisms.
Main Results:
- GWMA identified novel genetic loci (WDR72, UMOD, NLRC5) associated with β2M.
- Genetically predicted β2M showed a significant positive association with increased risk of diffuse large B-cell lymphoma (DLBCL) and Hodgkin lymphoma (HL) in UK Biobank and FinnGen cohorts.
- No significant association was found between genetically predicted B-cell malignancies and β2M levels, although reverse TSMR suggested potential influence of DLBCL, FL, and MM on β2M.
- Pathway analysis implicated the innate immune system in the β2M-DLBCL-HL relationship.
Conclusions:
- Elevated β2M levels are associated with an increased risk of DLBCL and HL.
- The observed association may be mediated by innate immune system dysfunction.
- The causal direction appears to be from β2M to B-cell malignancy risk, not vice versa, with some exceptions noted.
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