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Arjan Diepstra

As a hematopathologist, I work on diagnostics of all types of hematological malignancies using a comprehensive panel of different techniques. Moreover, my main research interest involves Hodgkin lymphoma, with a strong focus on interactions between tumor cells and the microenvironment. In addition, I also have a long standing interest in genetic susceptibility. My areas of expertise are: immunology, tumor cell biology, genetic association studies and molecular diagnostics in pathology. I actively participate in international (EORTC) and national (HOVON) clinical trials.

Core regions in immunoglobulin heavy chain enhancers essential for survival of non-Hodgkin lymphoma cells are identified by a CRISPR interference screen
Published in: Haematologica
Chromosomal translocations in non-Hodgkin lymphoma (NHL) result in activation of oncogenes by placing them under the regulation of immunoglobulin heavy chain (IGH) super-enhancers. Aberrant expression of translocated oncogenes induced by enhancer activity can contribute to lymphomagenesis. The role of the IGH enhancers in normal B-cell development is well established, but knowledge regarding the precise mechanisms of their involvement in control of the translocated oncogenes is limited. The goal of this project was to define the critical regions in the IGH regulatory elements and identify enhancer RNAs (eRNA). We...
Marta Elżbieta Kasprzyk, Weronika Sura, Marta Podralska, Marta Kazimierska, Annika Seitz, Wojciech Łosiewski, Tomasz Woźniak, Jeroen E J Guikema, Arjan Diepstra, Joost Kluiver, Anke Van den Berg, Natalia Rozwadowska, Agnieszka Dzikiewicz-Krawczyk
Memory B-cell derived donor-specific antibodies do not predict outcome in sensitized kidney transplant recipients: a retrospective single-center study
Published in: Frontiers in Immunology
BACKGROUND: Repeated exposure to sensitizing events can activate HLA-specific memory B cells, leading to the production of donor-specific memory B cell antibodies (DSAm) that pose a risk for antibody-mediated rejection (ABMR) in kidney transplant recipients (KTRs). This single-center retrospective study aimed to identify DSAm and assess their association with outcomes in a cohort of KTRs with pretransplant serum donor-specific antibodies (DSA). METHODS: We polyclonally activated pretransplant peripheral blood mononuclear cells (PBMCs) from 60 KTRs in vitro, isolated and quantified IgG from the culture supernatant using ELISA, and analyzed...
Dania Altulea, Joost C van den Born, Arjan Diepstra, Laura Bungener, Dagmar Terpstra, Bouke G Hepkema, Rosa Lammerts, Peter Heeringa, Sebastiaan Heidt, Henny Otten, Leon Reteig, Gonca E Karahan, Stefan P Berger, Jan-Stephan Sanders
Detection of circulating tumor DNA in plasma of patients with primary CNS lymphoma by digital droplet PCR
Published in: BMC Cancer
BACKGROUND: Primary central nervous system lymphoma (PCNSL) are rare mature B-cell lymphoproliferative diseases characterized by a high incidence of MYD88 L265P and CD79B Y196 hotspot mutations. Diagnosis of PCNSL can be challenging. The aim of the study was to analyze the detection rate of the MYD88 L265P and CD79B Y196 mutation in cell free DNA (cfDNA) in plasma of patients with PCNSL. METHODS: We analyzed by digital droplet PCR (ddPCR) to determine presence of the MYD88 L265P and CD79B Y196 hotspot mutations in cfDNA isolated from plasma of...
Pinpointing Functionally Relevant miRNAs in Classical Hodgkin Lymphoma Pathogenesis
Published in: Cancers
Classical Hodgkin lymphoma (cHL) is a hematological malignancy of B-cell origin. The tumor cells in cHL are referred to as Hodgkin and Reed-Sternberg (HRS) cells. This review provides an overview of the currently known miRNA-target gene interactions. In addition, we pinpointed other potential regulatory roles of microRNAs (miRNAs) by focusing on genes related to processes relevant for cHL pathogenesis, i.e., loss of B-cell phenotypes, immune evasion, and growth support. A cHL-specific miRNA signature was generated based on the available profiling studies. The interactions relevant for cHL were extracted...
Clonal hematopoiesis and UBA1 mutations in individuals with biopsy-proven giant cell arteritis and population-based controls
Published in: Rheumatology
Jonas B Salzbrunn, Isabelle A van Zeventer, Aniek O de Graaf, Priscilla Kamphuis, Maaike G J M van Bergen, Yannick van Sleen, Bert A van der Reijden, Jan Jacob Schuringa, Elisabeth Brouwer, Arjan Diepstra, Joop H Jansen, Gerwin Huls