GNA13 loss in germinal center B cells leads to impaired apoptosis and promotes lymphoma in vivo.

Published

Journal Article

GNA13 is the most frequently mutated gene in germinal center (GC)-derived B-cell lymphomas, including nearly a quarter of Burkitt lymphoma and GC-derived diffuse large B-cell lymphoma. These mutations occur in a pattern consistent with loss of function. We have modeled the GNA13-deficient state exclusively in GC B cells by crossing the Gna13 conditional knockout mouse strain with the GC-specific AID-Cre transgenic strain. AID-Cre(+) GNA13-deficient mice demonstrate disordered GC architecture and dark zone/light zone distribution in vivo, and demonstrate altered migration behavior, decreased levels of filamentous actin, and attenuated RhoA activity in vitro. We also found that GNA13-deficient mice have increased numbers of GC B cells that display impaired caspase-mediated cell death and increased frequency of somatic hypermutation in the immunoglobulin VH locus. Lastly, GNA13 deficiency, combined with conditional MYC transgene expression in mouse GC B cells, promotes lymphomagenesis. Thus, GNA13 loss is associated with GC B-cell persistence, in which impaired apoptosis and ongoing somatic hypermutation may lead to an increased risk of lymphoma development.

Full Text

Duke Authors

Cited Authors

  • Healy, JA; Nugent, A; Rempel, RE; Moffitt, AB; Davis, NS; Jiang, X; Shingleton, JR; Zhang, J; Love, C; Datta, J; McKinney, ME; Tzeng, TJ; Wettschureck, N; Offermanns, S; Walzer, KA; Chi, J-T; Rasheed, SAK; Casey, PJ; Lossos, IS; Dave, SS

Published Date

  • June 2016

Published In

Volume / Issue

  • 127 / 22

Start / End Page

  • 2723 - 2731

PubMed ID

  • 26989201

Pubmed Central ID

  • 26989201

Electronic International Standard Serial Number (EISSN)

  • 1528-0020

International Standard Serial Number (ISSN)

  • 0006-4971

Digital Object Identifier (DOI)

  • 10.1182/blood-2015-07-659938

Language

  • eng