Recurrent mutations of the STAT6 DNA binding domain in primary mediastinal B-cell lymphoma.
Primary mediastinal B-cell lymphoma (PMBL) is a separate entity of aggressive B-cell lymphoma, characterized by a constitutive activation of janus kinase-signal transducer and activator of transcription (JAK-STAT) signaling pathway, also observed in Hodgkin lymphoma. Although many cancers exhibit constitutive JAK-STAT pathway activation, mutations of STAT genes have not been reported in neoplasms. Here, we show that MedB-1 PMBL-derived and L1236 Hodgkin-derived cell lines and 20 of 55 (36%) PMBL cases harbor heterozygous missense mutations in STAT6 DNA binding domain, whereas no mutation was found in 25 diffuse large B-cell lymphoma samples. In 3 cases, somatic origin was indicated by the absence of the mutations in the nontumoral tissue. The pattern of STAT6 mutations was different from the classical features of somatic hypermutations. The mutant STAT6 proteins showed a decreased DNA binding ability in transfected HEK cells, but no decrease in expression of STAT6 canonical target genes was observed in PMBL cases with a mutated STAT6 gene. Although the oncogenic properties of STAT6 mutant proteins remain to be determined, their recurrent selection in PMBL strongly argues for their involvement in the pathogenesis of this aggressive B-cell lymphoma.
Ritz
Olga
O
Abteilung für Pathologie des Universitätklinikums Ulm, Ulm, Germany.
Guiter
Chrystelle
C
Castellano
Flavia
F
Dorsch
Karola
K
Melzner
Julia
J
Jais
Jean-Philippe
JP
Dubois
Gwendoline
G
Gaulard
Philippe
P
Möller
Peter
P
Leroy
Karen
K
D045744:Cell Line, Tumor; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics*; D006801:Humans; D016403:Lymphoma, Large B-Cell, Diffuse / Q000235:genetics* / Q000378:metabolism; D008297:Male; D008479:Mediastinal Neoplasms / Q000235:genetics* / Q000378:metabolism; D009154:Mutation / Q000235:genetics*; D009363:Neoplasm Proteins / Q000235:genetics* / Q000378:metabolism; D017434:Protein Structure, Tertiary / Q000235:genetics; D050800:STAT6 Transcription Factor / Q000235:genetics* / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics
D009363:Neoplasm Proteins; D050800:STAT6 Transcription Factor; C494101:STAT6 protein, human