The Genetic Landscape of Ocular Adnexa MALT Lymphoma Reveals Frequent Aberrations in NFAT and MEF2B Signaling Pathways

Cancer Res Commun. 2021 Oct;1(1):1-16. doi: 10.1158/2767-9764.crc-21-0022. Epub 2021 Oct 13.

Abstract

A comprehensive constellation of somatic non-silent mutations and copy number (CN) variations in ocular adnexa marginal zone lymphoma (OAMZL) is unknown. By utilizing whole-exome sequencing in 69 tumors we define the genetic landscape of OAMZL. Mutations and CN changes in CABIN1 (30%), RHOA (26%), TBL1XR1 (22%), and CREBBP (17%) and inactivation of TNFAIP3 (26%) were among the most common aberrations. Candidate cancer driver genes cluster in the B-cell receptor (BCR), NFkB, NOTCH and NFAT signaling pathways. One of the most commonly altered genes is CABIN1, a calcineurin inhibitor acting as a negative regulator of the NFAT and MEF2B transcriptional activity. CABIN1 deletions enhance BCR-stimulated NFAT and MEF2B transcriptional activity, while CABIN1 mutations enhance only MEF2B transcriptional activity by impairing binding of mSin3a to CABIN1. Our data provide an unbiased identification of genetically altered genes that may play a role in the molecular pathogenesis of OAMZL and serve as therapeutic targets.

Keywords: CABIN1; MEF2B; Marginal zone lymphoma; NFAT; Orbital adnexa lymphoma.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Extramural

MeSH terms

  • Eye Neoplasms* / genetics
  • Humans
  • Lymphoma, B-Cell, Marginal Zone* / genetics
  • MEF2 Transcription Factors / genetics
  • Mutation / genetics
  • NF-kappa B / genetics
  • Signal Transduction / genetics

Substances

  • NF-kappa B
  • MEF2B protein, human
  • MEF2 Transcription Factors