Clonally related diffuse large B-cell lymphoma and interdigitating dendritic cell sarcoma sharing MYC translocation.
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ABSTRACT:
SUBMITTER: Ochi Y
PROVIDER: S-EPMC6278963 | biostudies-literature | 2018 Nov
REPOSITORIES: biostudies-literature
Publications
Clonally related diffuse large B-cell lymphoma and interdigitating dendritic cell sarcoma sharing <i>MYC</i> translocation.
Ochi Yotaro Y Hiramoto Nobuhiro N Yoshizato Tetsuichi T Ono Yuichiro Y Takeda June J Shiozawa Yusuke Y Yoshida Kenichi K Kakiuchi Nobuyuki N Shiraishi Yuichi Y Tanaka Hiroko H Chiba Kenichi K Kazuma Yasuhiro Y Tabata Sumie S Yonetani Noboru N Uehara Keiichiro K Yamashita Daisuke D Imai Yukihiro Y Nagafuji Koji K Yamakawa Mitsunori M Miyano Satoru S Takaori-Kondo Akifumi A Ogawa Seishi S Ishikawa Takayuki T
Haematologica 20180920 11
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Project description:BackgroundThe oncogenic transcription factor MYC is pathologically activated in many human malignancies. A paradigm for MYC dysregulation is offered by Burkitt lymphoma, where chromosomal translocations leading to Immunoglobulin gene-MYC fusion are the crucial initiating oncogenic events. However, Burkitt lymphoma cases with no detectable MYC rearrangement but maintaining MYC expression have been identified and alternative mechanisms can be involved in MYC dysregulation in these cases.MethodsWe studied the microRNA profile of MYC translocation-positive and MYC translocation-negative Burkitt lymphoma cases in order to uncover possible differences at the molecular level. Data was validated at the mRNA and protein level by quantitative Real-Time polymerase chain reaction and immunohistochemistry, respectively.ResultsWe identified four microRNAs differentially expressed between the two groups. The impact of these microRNAs on the expression of selected genes was then investigated. Interestingly, in MYC translocation-negative cases we found over-expression of DNA-methyl transferase family members, consistent to hypo-expression of the hsa-miR-29 family. This finding suggests an alternative way for the activation of lymphomagenesis in these cases, based on global changes in methylation landscape, aberrant DNA hypermethylation, lack of epigenetic control on transcription of targeted genes, and increase of genomic instability. In addition, we observed an over-expression of another MYC family gene member, MYCN that may therefore represent a cooperating mechanism of MYC in driving the malignant transformation in those cases lacking an identifiable MYC translocation but expressing the gene at the mRNA and protein levels.ConclusionsCollectively, our results showed that MYC translocation-positive and MYC translocation-negative Burkitt lymphoma cases are slightly different in terms of microRNA and gene expression. MYC translocation-negative Burkitt lymphoma, similarly to other aggressive B-cell non Hodgkin's lymphomas, may represent a model to understand the intricate molecular pathway responsible for MYC dysregulation in cancer.
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