Cell Reports (Dec 2020)

The Histone Methyltransferase DOT1L Is Essential for Humoral Immune Responses

  • Liam Kealy,
  • Andrea Di Pietro,
  • Lauren Hailes,
  • Sebastian Scheer,
  • Lennard Dalit,
  • Joanna R. Groom,
  • Colby Zaph,
  • Kim L. Good-Jacobson

Journal volume & issue
Vol. 33, no. 11
p. 108504

Abstract

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Summary: Histone modifiers are essential for the ability of immune cells to reprogram their gene expression during differentiation. The recruitment of the histone methyltransferase DOT1L (disruptor of telomeric silencing 1-like) induces oncogenic gene expression in a subset of B cell leukemias. Despite its importance, its role in the humoral immune system is unclear. Here, we demonstrate that DOT1L is a critical regulator of B cell biology. B cell development is defective in Dot1lf/fMb1Cre/+ mice, culminating in a reduction of peripheral mature B cells. Upon immunization or influenza infection of Dot1lf/fCd23Cre/+ mice, class-switched antibody-secreting cells are significantly attenuated and germinal centers fail to form. Consequently, DOT1L is essential for B cell memory formation. Transcriptome, pathway, and histological analyses identified a role for DOT1L in reprogramming gene expression for appropriate localization of B cells during the initial stage of the response. Together, these results demonstrate an essential role for DOT1L in generating an effective humoral immune response.

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