Abstract
Thrombopoietin (THPO) is an essential factor for platelet production. Hereditary thrombocythemia (HT) is caused by a germline mutation of THPO, MPL, or JAK2 and is inherited in an autosomal-dominant manner. We identified a Japanese family with HT due to a point mutation of the splicing donor site of the THPO gene (THPO c.13 + 1G > A). Bone marrow biopsy showed increased megakaryocytes mimicking essential thrombocythemia. One affected family member developed chronic myeloid leukemia. We cloned the mutation and developed mutated and wild type THPO expression vectors. Molecular analysis showed that the mutation causes an exon 3 skipping transcript of THPO that abrogates a suppressive untranslated upstream open reading frame. Although the transcript levels of THPO mRNA were comparable, mutated transcripts were more efficiently translated and THPO protein expression was significantly higher than that of the wild type.
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The data sets generated and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
We thank Dr. Hiroshi Ikeda (Sapporo Medical College) for providing information about ii1 patient under consent of family member.
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This work was supported by research budget of Department of Hematology, Hokkaido University Faculty of Medicine.
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H. K. and M. O. designed the study, analyzed the data, and wrote the manuscript. H. K., J. H., and D. H. performed experiments. H. O. and Y. M. verified pathological finding of bone marrow biopsy. M. K., T. M., and K. T. were involved in the critical evaluation of the manuscript and data presentation. T. T. revised and approved the manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the Institutional Review Board of Hokkaido University Faculty of Medicine (IRB#17–037).
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Kimura, H., Onozawa, M., Hashiguchi, J. et al. Hereditary thrombocythemia due to splicing donor site mutation of THPO in a Japanese family. Ann Hematol 103, 89–96 (2024). https://doi.org/10.1007/s00277-023-05523-9
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DOI: https://doi.org/10.1007/s00277-023-05523-9