Recurrent mutations in NF-?B pathway components, KMT2D, and NOTCH1/2 in ocular adnexal MALT-type marginal zone lymphomas.

ABSTRACT: The pathogenesis of ocular adnexal marginal zone lymphomas of mucosa-associated lymphatic tissue-type (OAML) is still poorly understood. We analyzed 63 cases of such lymphomas for non-synonymous mutations in 24 candidate genes by amplicon sequencing. We validated frequent mutations in the NF-?B regulators MYD88, TNFAIP3 and TNIP1 in OAML, but also identified recurrent mutations in several additional components of the NF-?B pathway, including BCL10 and NFKBIA. Overall, 60% of cases had mutations in at least one component of NF-?B signaling, pointing to a central role of its genetic deregulation in OAML pathogenesis. Mutations in NOTCH1 and NOTCH2 were each found in 8% of cases, indicating a pathogenetic function of these factors in OAML. KMT2D was identified as the first epigenetic regulator with mutations in OAML, being mutated in 22% of cases. Mutations in MYD88 were associated with an inferior disease-free survival. Overall, we identified here highly recurrent genetic lesions in components of the NF-?B pathway, of NOTCH1 and NOTCH2 as well as KMT2D in OAML and thereby provide major novel insights into the pathogenesis of this B cell malignancy.

SUBMITTER: Johansson P 

PROVIDER: S-EPMC5308752 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature