A high frequency of diverse activating mutations in costimulatory/TCR-related signaling genes occurs in AITL and other TFH-derived PTCL.; Deregulated TCR activation may play a role in the pathogenesis of TFH-derived PTCL, paving the way for developing novel targeted therapies.
Abstract :
[en] Angioimmunoblastic T-cell lymphoma (AITL) and other lymphomas derived from follicular
T-helper cells (TFH) represent a large proportion of peripheral T-cell lymphomas (PTCLs) with poorly understood pathogenesis and unfavorable treatment results. We investigated a series of 85 patients with AITL (n 5 72) or other TFH-derived PTCL (n 5 13) by targeted deep sequencing of a gene panel enriched in T-cell receptor (TCR) signaling elements. RHOA mutations were identified in 51 of 85 cases (60%) consisting of the highly recurrent dominant negative G17V variant in most cases and a novel K18N in 3 cases, the latter showing activating properties in in vitro assays. Moreover, half of the patients carried virtually mutually exclusive mutations in other TCR-related genes, most frequently in PLCG1 (14.1%), CD28 (9.4%, exclusively in AITL), PI3K elements (7%), CTNNB1 (6%), and GTF2I (6%). Using in vitro assays in transfected cells, we demonstrated that 9 of 10 PLCG1 and 3 of 3 CARD11 variants induced MALT1 protease activity and increased transcription from NFAT or NF-kB response element reporters, respectively. Collectively, the vast majority of variants in TCR-related genes could be classified as gain-of-function. Accordingly, the samples with mutations in TCR-related genes other than RHOA had transcriptomic profiles enriched in signatures reflecting higher T-cell activation. Although no correlationwithpresenting clinical featuresnor significantimpacton survivalwasobserved, thepresenceofTCR-relatedmutations correlated with early disease progression. Thus, targeting of TCR-related eventsmay hold promise for the treatment of TFH-derived lymphomas.
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