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Developmental partitioning of SYK and ZAP70 prevents autoimmunity and cancer.

Teresa Sadras | Mickaël Martin | Kohei Kume | Mark E Robinson | Supraja Saravanakumar | Gal Lenz | Zhengshan Chen | Joo Y Song | Tanya Siddiqi | Laura Oksa | Anne Marie Knapp | Jevon Cutler | Kadriye Nehir Cosgun | Lars Klemm | Veronika Ecker | Janet Winchester | Dana Ghergus | Pauline Soulas-Sprauel | Friedemann Kiefer | Nora Heisterkamp | Akhilesh Pandey | Vu Ngo | Lili Wang | Hassan Jumaa | Maike Buchner | Jürgen Ruland | Wing-Chung Chan | Eric Meffre | Thierry Martin | Markus Müschen
Molecular cell | 2021

Even though SYK and ZAP70 kinases share high sequence homology and serve analogous functions, their expression in B and T cells is strictly segregated throughout evolution. Here, we identified aberrant ZAP70 expression as a common feature in a broad range of B cell malignancies. We validated SYK as the kinase that sets the thresholds for negative selection of autoreactive and premalignant clones. When aberrantly expressed in B cells, ZAP70 competes with SYK at the BCR signalosome and redirects SYK from negative selection to tonic PI3K signaling, thereby promoting B cell survival. In genetic mouse models for B-ALL and B-CLL, conditional expression of Zap70 accelerated disease onset, while genetic deletion impaired malignant transformation. Inducible activation of Zap70 during B cell development compromised negative selection of autoreactive B cells, resulting in pervasive autoantibody production. Strict segregation of the two kinases is critical for normal B cell selection and represents a central safeguard against the development of autoimmune disease and B cell malignancies.

Pubmed ID: 33878293 RIS Download

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Antibodies used in this publication

Associated grants

  • Agency: NCI NIH HHS, United States
    Id: R01 CA240910
  • Agency: NCI NIH HHS, United States
    Id: R01 CA213138
  • Agency: NIAID NIH HHS, United States
    Id: R01 AI118855
  • Agency: NCI NIH HHS, United States
    Id: R01 CA157644
  • Agency: NCI NIH HHS, United States
    Id: P01 CA233412
  • Agency: Howard Hughes Medical Institute, United States
    Id: 55108547
  • Agency: NCI NIH HHS, United States
    Id: R35 CA197628
  • Agency: NIAID NIH HHS, United States
    Id: P01 AI061093

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QuPath (tool)

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