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PAX5 rearrangements (PAX5-r) act as a critical genetic driver in B-cell acute lymphoblastic leukaemia. Recent research has identified a novel in-frame PAX5 fusion in B-ALL, involving the GSE1 gene. This discovery provides fresh insights into the molecular landscape of the disease. Furthermore, it highlights new opportunities for monitoring treatment response through specialized biomarkers.
The PAX5::GSE1 fusion protein localizes directly to the cell nucleus. Once there, it actively promotes cell proliferation while suppressing the transcriptional activity of wild-type PAX5. Because of this, the fusion gene effectively disrupts normal B-cell development. Researchers also found that transcript levels of this fusion correlate significantly with treatment response. Consequently, this makes it a promising biomarker for minimal residual disease (MRD) monitoring.
An analysis of 330 patients with PAX5-r B-ALL revealed 76 distinct in-frame partner genes. Although these partners vary, they induce a convergent expression profile. This profile is characterized by the dysregulation of the retinoblastoma transcriptional corepressor 1 (RB1) and p53 pathways. Additionally, many cases show a marked overexpression of nucleophosmin 1 (NPM1). These findings help clarify the core mechanisms of leukaemogenesis. Ultimately, they point toward potential therapeutic vulnerabilities in patients carrying these genetic signatures.
The PAX5::GSE1 fusion promotes leukemia cell growth and serves as a potential biomarker for monitoring minimal residual disease (MRD) and treatment response.
It creates a convergent profile featuring p53 and RB1 pathway dysregulation along with the overexpression of nucleophosmin 1 (NPM1).
In a large-scale study of 330 patients, researchers identified 76 distinct in-frame partner genes that fuse with PAX5.
Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a professional relationship. Always seek the advice of a qualified healthcare provider for any questions regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.
References
1. Wang H et al. Identification of GSE1 as a PAX5 fusion partner and characterization of PAX5 fusion signature in B-cell acute lymphoblastic leukaemia. Br J Haematol. 2026 May 27. doi: 10.1111/bjh.70578. PMID: 42204379.
2. Gu Z, Johnstone AL, Schore RJ, et al. PAX5 alterations in B-cell acute lymphoblastic leukemia. Front Oncol. 2022 Oct 25;12:1010375. doi: 10.3389/fonc.2022.1010375.
3. Liu Y et al. Recurrent PAX5::ZCCHC7 rearrangement in B-cell acute lymphoblastic leukemia. Ann Hematol. 2024 Dec;103(12):5599-5605. doi: 10.1007/s00277-024-06114-y.
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Researchers have identified GSE1 as a novel PAX5 fusion partner in B-cell acute lymphoblastic leukaemia, offering new insights into MRD monitoring....
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