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Protein arginine methyltransferase 5 (Prmt5) is crucial for antibody responses and B cell development and function. This study reveals Prmt5

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • B cell development, activation, and differentiation are key to humoral immunity.
  • Protein arginine methyltransferase 5 (Prmt5) is implicated in B cell lymphomas, but its role in normal B cells is unclear.

Purpose of the Study:

  • To investigate the function of Prmt5 in normal B cell development, activation, and differentiation.
  • To elucidate the mechanisms by which Prmt5 regulates B cell biology.

Main Methods:

  • Mice models were used to study B cell development and antibody responses.
  • Phenotypic analysis and RNA-sequencing (RNA-seq) were employed to assess Prmt5 function.
  • p53-dependent and p53-independent pathways were investigated.

Main Results:

  • Prmt5 is essential for B cell development by preventing developmental blocks in Pro-B and Pre-B cells.
  • Prmt5 protects mature B cells from apoptosis during activation and promotes germinal center (GC) expansion.
  • Prmt5 regulates GC light zone B cell fate by controlling transcriptional programs and RNA splicing fidelity.

Conclusions:

  • Prmt5 plays essential and distinct roles in all proliferative B cell stages.
  • Prmt5 is a critical regulator of antibody responses and B cell homeostasis.
  • Prmt5 ensures RNA splicing fidelity, contributing to B cell fate regulation.