1. Exome sequencing identifies recurrent BCOR alterations and the absence of KLF2, TNFAIP3 and MYD88 mutations in splenic diffuse red pulp small B-cell lymphoma
- Author
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Jallades, Laurent, Baseggio, Lucile, Sujobert, Pierre, Huet, Sarah, Chabane, Kaddour, Callet-Bauchu, Evelyne, Verney, Aurélie, Hayette, Sandrine, Desvignes, Jean-Pierre, Salgado, David, Lévy, Nicolas, Béroud, Christophe, Felman, Pascale, Berger, Françoise, Magaud, Jean-Pierre, Genestier, Laurent, Salles, Gilles, Traverse-Glehen, Alexandra, Service d’Hématologie [Centre Hospitalier Lyon Sud - HCL], Centre Hospitalier Lyon Sud [CHU - HCL] (CHLS), Hospices Civils de Lyon (HCL)-Hospices Civils de Lyon (HCL), Centre de Recherche en Cancérologie de Lyon (UNICANCER/CRCL), Centre Léon Bérard [Lyon]-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Génétique Médicale et Génomique Fonctionnelle (GMGF), Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)- Hôpital de la Timone [CHU - APHM] (TIMONE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Hôpital de la Timone [CHU - APHM] (TIMONE), Service d'hématologie [Hôpital Edouard Herriot - HCL], Hôpital Edouard Herriot [CHU - HCL], Laboratoire d'anatomie et de cytopathologie - Centre hospitalier Lyon Sud, Hospices Civils de Lyon (HCL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), and Institut National de la Santé et de la Recherche Médicale (INSERM)-Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)- Hôpital de la Timone [CHU - APHM] (TIMONE)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Lymphoma, B-Cell ,DNA Copy Number Variations ,Indolent Non-Hodgkin's Lymphoma ,Non-Hodgkin Lymphoma ,Kruppel-Like Transcription Factors ,[SDV.CAN]Life Sciences [q-bio]/Cancer ,Article ,immune system diseases ,hemic and lymphatic diseases ,Proto-Oncogene Proteins ,Exome Sequencing ,Biomarkers, Tumor ,Humans ,Tumor Necrosis Factor alpha-Induced Protein 3 ,Aged ,Aged, 80 and over ,Chromosome Aberrations ,Leukemia, Hairy Cell ,Cytogenetics and Molecular Genetics ,Splenic Neoplasms ,Genetic Variation ,Lymphoma, B-Cell, Marginal Zone ,Middle Aged ,Lymphoproliferative Disorders ,Repressor Proteins ,Mutation ,Myeloid Differentiation Factor 88 ,Female - Abstract
Splenic diffuse red pulp lymphoma is an indolent small B-cell lymphoma recognized as a provisional entity in the World Health Organization 2008 classification. Its precise relationship to other related splenic B-cell lymphomas with frequent leukemic involvement or other lymphoproliferative disorders remains undetermined. We performed whole-exome sequencing to explore the genetic landscape of ten cases of splenic diffuse red pulp lymphoma using paired tumor and normal samples. A selection of 109 somatic mutations was then evaluated in a cohort including 42 samples of splenic diffuse red pulp lymphoma and compared to those identified in 46 samples of splenic marginal zone lymphoma and eight samples of hairy-cell leukemia. Recurrent mutations or losses in BCOR (the gene encoding the BCL6 corepressor) – frameshift (n=3), nonsense (n=2), splicing site (n=1), and copy number loss (n=4) – were identified in 10/42 samples of splenic diffuse red pulp lymphoma (24%), whereas only one frameshift mutation was identified in 46 cases of splenic marginal zone lymphoma (2%). Inversely, KLF2, TNFAIP3 and MYD88, common mutations in splenic marginal zone lymphoma, were rare (one KLF2 mutant in 42 samples; 2%) or absent (TNFAIP3 and MYD88) in splenic diffuse red pulp lymphoma. These findings define an original genetic profile of splenic diffuse red pulp lymphoma and suggest that the mechanisms of pathogenesis of this lymphoma are distinct from those of splenic marginal zone lymphoma and hairy-cell leukemia.
- Published
- 2017
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