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SF3B1K700E Neoantigen Is a CD8+ T-cell Target Shared across Human Myeloid Neoplasms.

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Mutations in spliceosome genes are common in myelodysplastic neoplasms (MDS). Researchers identified a specific SF3B1K700E neoantigen as a promising target for T-cell therapies in MDS and acute myeloid leukemia.

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Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Acquired mutations in spliceosome genes are frequent in early hematopoietic stem/progenitor cells, driving myelodysplastic neoplasms (MDS) and related myeloid malignancies.
  • Mutations in SF3B1 (spliceosome factor subunit B1) are found in over 20% of MDS cases, acting as driver events in early neoplastic clones.

Purpose of the Study:

  • To identify and validate neoantigens from aberrant SF3B1 proteins as potential shared T-cell therapy targets for SF3B1-mutated myeloid neoplasms.
  • To assess the immunogenicity and therapeutic potential of the SF3B1K700E neoantigen.

Main Methods:

  • In silico prediction of epitope processing and presentation for the SF3B1K700E variant.
  • In vitro validation of neoantigen presentation and CD8+ T-cell recognition and killing.
  • T-cell receptor (TCR) sequencing, cloning, and transduction into third-party T cells.
  • In vitro and in vivo assessment of TCR-engineered T-cell efficacy.

Main Results:

  • A candidate neoantigen, SF3B1K700E, was identified and validated for presentation and immunogenicity.
  • CD8+ T cells recognizing SF3B1K700E exhibited high functional avidity and specifically killed neoplastic myeloid cells.
  • TCR transfer conferred antigen specificity and effective killing of neoplastic myeloid cells in vitro and in vivo.

Conclusions:

  • The SF3B1K700E neoantigen is a promising shared T-cell target for patients with SF3B1-mutated MDS and acute myeloid leukemia.
  • T-cell receptor-based immunotherapy targeting SF3B1K700E holds potential for treating these hematologic malignancies.