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Silva JPL, Donaires FS, Gutierrez-Rodrigues F, Martins DJ, Carvalho VS, Santana BA, Cunha RLG, Kajigaya S, Menck CFM, Young NS, Kjeldsen E, Calado RT. RecQ helicase expression in patients with telomeropathies. Mol Biol Rep 2024; 51:754. [PMID: 38874681 DOI: 10.1007/s11033-024-09678-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 05/24/2024] [Indexed: 06/15/2024]
Abstract
BACKGROUND Telomeropathies are a group of inherited disorders caused by germline pathogenic variants in genes involved in telomere maintenance, resulting in excessive telomere attrition that affects several tissues, including hematopoiesis. RecQ and RTEL1 helicases contribute to telomere maintenance by unwinding telomeric structures such as G-quadruplexes (G4), preventing replication defects. Germline RTEL1 variants also are etiologic in telomeropathies. METHODS AND RESULTS Here we investigated the expression of RecQ (RECQL1, BLM, WRN, RECQL4, and RECQL5) and RTEL1 helicase genes in peripheral blood mononuclear cells (PBMCs) from human telomeropathy patients. The mRNA expression levels of all RecQ helicases, but not RTEL1, were significantly downregulated in patients' primary cells. Reduced RecQ expression was not attributable to cell proliferative exhaustion, as RecQ helicases were not attenuated in T cells exhausted in vitro. An additional fifteen genes involved in DNA damage repair and RecQ functional partners also were downregulated in the telomeropathy cells. CONCLUSION These findings indicate that the expression of RecQ helicases and functional partners involved in DNA repair is downregulated in PBMCs of telomeropathy patients.
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Affiliation(s)
- João Paulo L Silva
- Department of Medical Imaging, Hematology, and Oncology, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900 - 7 o andar, sala 743 - HCRP, Ribeirão Preto, SP, 14049-900, Brazil
| | - Flávia S Donaires
- Department of Medical Imaging, Hematology, and Oncology, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900 - 7 o andar, sala 743 - HCRP, Ribeirão Preto, SP, 14049-900, Brazil
| | | | - Davi J Martins
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Vinicius S Carvalho
- Department of Medical Imaging, Hematology, and Oncology, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900 - 7 o andar, sala 743 - HCRP, Ribeirão Preto, SP, 14049-900, Brazil
| | - Barbara A Santana
- Department of Medical Imaging, Hematology, and Oncology, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900 - 7 o andar, sala 743 - HCRP, Ribeirão Preto, SP, 14049-900, Brazil
| | - Renato L G Cunha
- Department of Medical Imaging, Hematology, and Oncology, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900 - 7 o andar, sala 743 - HCRP, Ribeirão Preto, SP, 14049-900, Brazil
| | - Sachiko Kajigaya
- Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Carlos F M Menck
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Neal S Young
- Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Eigil Kjeldsen
- Department of Hematology, Aarhus University Hospital, Aarhus, Denmark
| | - Rodrigo T Calado
- Department of Medical Imaging, Hematology, and Oncology, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900 - 7 o andar, sala 743 - HCRP, Ribeirão Preto, SP, 14049-900, Brazil.
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Yoon J, Cho EH, Yun JW, Kim HY, Jang JH, Kim HJ, Kim SH. LSAMP Rearrangement in Acute Myeloid Leukemia With a Jumping Translocation Involving 3q13.31. Ann Lab Med 2021; 41:342-345. [PMID: 33303723 PMCID: PMC7748089 DOI: 10.3343/alm.2021.41.3.342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 07/15/2020] [Accepted: 11/11/2020] [Indexed: 11/22/2022] Open
Affiliation(s)
- Jung Yoon
- Department of Laboratory Medicine, Korea University Guro Hospital, Seoul, Korea
| | - Eun Hye Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jae Won Yun
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.,Veterans Medical Research Institute, Veterans Health Service Medical Center, Seoul, Korea
| | - Hyun-Young Kim
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jun Ho Jang
- Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Hee-Jin Kim
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sun-Hee Kim
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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Behrens YL, Thomay K, Hagedorn M, Ebersold J, Schmidt G, Lentes J, Davenport C, Schlegelberger B, Göhring G. Jumping translocations: Short telomeres or pathogenic TP53 variants as underlying mechanism in acute myeloid leukemia and myelodysplastic syndrome? Genes Chromosomes Cancer 2019; 58:139-148. [PMID: 30614587 DOI: 10.1002/gcc.22665] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 06/28/2018] [Accepted: 06/29/2018] [Indexed: 11/08/2022] Open
Abstract
Chromosomal rearrangements involving one donor chromosome and two or more recipient chromosomes are called jumping translocations. To date only few cases of acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS) with jumping translocations have been described and the underlying mechanisms remain unclear. Here, we analyzed 11 AML and 5 MDS cases with jumping translocations. The cases were analyzed by karyotyping, FISH, telomere length measurement, and next-generation sequencing with an AML/MDS gene panel. Cases with jumping translocations showed significantly (P < .01) shorter telomeres in comparison to healthy age-matched controls. Additional neo-telomeres were found in two cases. In total, eight cases showed recipient chromosomes with a breakpoint in the centromeric region all of them harboring a pathogenic variant in the TP53 gene (n = 6) and/or a loss of TP53 (n = 5). By contrast, no pathogenic variant or loss of TP53 was identified in the six cases showing recipient chromosomes with a breakpoint in the telomeric region. In conclusion, our results divide the cohort of AML and MDS cases with jumping translocations into two groups: the first group with a telomeric breakpoint of the recipient chromosome is characterized by short telomeres and a possibly telomere-based mechanism of chromosomal instability formation. The second group with a centromeric breakpoint of the recipient chromosome is defined by mutation and/or loss of TP53. We, therefore, assume that both critically short telomeres as well as pathogenic variants of TP53 influence jumping translocation formation.
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Affiliation(s)
| | - Kathrin Thomay
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
| | - Maike Hagedorn
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
| | - Juliane Ebersold
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
| | - Gunnar Schmidt
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
| | - Jana Lentes
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
| | - Claudia Davenport
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
| | | | - Gudrun Göhring
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
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Kjeldsen E. Telomere Shortening in Hematological Malignancies with Tetraploidization-A Mechanism for Chromosomal Instability? Cancers (Basel) 2017; 9:cancers9120165. [PMID: 29189717 PMCID: PMC5742813 DOI: 10.3390/cancers9120165] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 11/27/2017] [Accepted: 11/28/2017] [Indexed: 11/19/2022] Open
Abstract
Aneuploidy, the presence of an abnormal number of chromosomes in a cell, is one of the most obvious differences between normal and cancer cells. There is, however, debate on how aneuploid cells arise and whether or not they are a cause or a consequence of tumorigenesis. Further, it is important to distinguish aneuploidy (the “state” of the karyotype) from chromosomal instability (CIN; the “rate” of karyotypic change). Although CIN leads to aneuploidy, not all aneuploid cells exhibit CIN. One proposed route to aneuploid cells is through an unstable tetraploid intermediate because tetraploidy promotes chromosomal aberrations and tumorigenesis. Tetraploidy or near-tetraploidy (T/NT) (81–103 chromosomes) karyotypes with or without additional structural abnormalities have been reported in acute leukemia, T-cell and B-cell lymphomas, and solid tumors. In solid tumors it has been shown that tetraploidization can occur in response to loss of telomere protection in the early stages of tumorigenesis in colon cancer, Barrett’s esophagus, and breast and cervical cancers. In hematological malignancies T/NT karyotypes are rare and the role of telomere dysfunction for the induction of tetraploidization is less well characterized. To further our understanding of possible telomere dysfunction as a mechanism for tetrapolydization in hematological cancers we here characterized the chromosomal complement and measured the telomere content by interphase nuclei quantitative fluorescence in situ hybridization (iQFISH) in seven hematological cancer patients with T/NT karyotypes, and after cytogenetic remission. The patients were identified after a search in our local cytogenetic registry in the 5-year period between June 2012 and May 2017 among more than 12,000 analyzed adult patients in this period. One advantage of measuring telomere content by iQFISH is that it is a single-cell analysis so that the telomere content can be distinguished between normal karyotype cells and cells with T/NT karyotypes. We find that the telomeres are particularly short in cells with T/NT karyotypes as compared with normal cells, and in T/NT karyotypes harboring additional chromosomal aberrations as well. These findings suggest that telomere dysfunction in hematological malignancies may be a mechanism for tetraploidization and CIN.
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Affiliation(s)
- Eigil Kjeldsen
- Cancercytogenetic Section, HemoDiagnostic Laboratory, Department of Hematology, Aarhus University Hospital, Tage-Hansens Gade 2, Ent. 4A, DK-8000 Aarhus C, Denmark, ; Tel.: +45-7846-7799; Fax: +45-7846-7399.
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Kjeldsen E. Duplication of subtelomeric regions in an adult with acute monocytic leukemia with an acquired jumping translocation involving 3q13.31-qter. Data Brief 2017; 13:675-682. [PMID: 28725672 PMCID: PMC5506863 DOI: 10.1016/j.dib.2017.06.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 06/28/2017] [Indexed: 11/18/2022] Open
Abstract
A jumping translocation (JT) involves a single donor chromosome and two or more recipient chromosomes in which a similar chromosomal region is translocated to various recipient chromosomes in different cell lines of a single individual. JTs are often associated with telomeric regions. Only 21 acquired JTs have previously been described in myeloid malignancies. Three of these cases involved the 3q13.31-qter region of which all were associated with a dismal outcome. In our recent publication, “Characterization of an acquired jumping translocation involving 3q13.31-qter in a patient with de novo acute monocytic leukemia” [1], we characterized the breakpoint region 3q13.31 by oligo-based array comparative genomic hybridization analysis. The present article provides data on copy number aberrations observed in the subtelomeric regions of this patient. Copy number alterations in the subtelomeric region have not been addressed previously in patients with JT.
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