1
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Jevtic Z, Allram M, Grebien F, Schwaller J. Biomolecular Condensates in Myeloid Leukemia: What Do They Tell Us? Hemasphere 2023; 7:e923. [PMID: 37388925 PMCID: PMC10306439 DOI: 10.1097/hs9.0000000000000923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 05/31/2023] [Indexed: 07/01/2023] Open
Abstract
Recent studies have suggested that several oncogenic and tumor-suppressive proteins carry out their functions in the context of specific membrane-less cellular compartments. As these compartments, generally referred to as onco-condensates, are specific to tumor cells and are tightly linked to disease development, the mechanisms of their formation and maintenance have been intensively studied. Here we review the proposed leukemogenic and tumor-suppressive activities of nuclear biomolecular condensates in acute myeloid leukemia (AML). We focus on condensates formed by oncogenic fusion proteins including nucleoporin 98 (NUP98), mixed-lineage leukemia 1 (MLL1, also known as KMT2A), mutated nucleophosmin (NPM1c) and others. We also discuss how altered condensate formation contributes to malignant transformation of hematopoietic cells, as described for promyelocytic leukemia protein (PML) in PML::RARA-driven acute promyelocytic leukemia (APL) and other myeloid malignancies. Finally, we discuss potential strategies for interfering with the molecular mechanisms related to AML-associated biomolecular condensates, as well as current limitations of the field.
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Affiliation(s)
- Zivojin Jevtic
- Department of Biomedicine (DBM), University Children’s Hospital Basel, University of Basel, Switzerland
| | - Melanie Allram
- Institute for Medical Biochemistry, University of Veterinary Medicine, Vienna, Austria
| | - Florian Grebien
- Institute for Medical Biochemistry, University of Veterinary Medicine, Vienna, Austria
- St. Anna Children’s Cancer Research Institute (CCRI), Vienna, Austria
| | - Juerg Schwaller
- Department of Biomedicine (DBM), University Children’s Hospital Basel, University of Basel, Switzerland
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2
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Kim DH. A three‑way complex translocation of (15;15;17)(q24;q14;q21) involving two breakpoints on chromosome 15 in acute promyelocytic leukemia: A case report. Oncol Lett 2023; 26:309. [PMID: 37332331 PMCID: PMC10272972 DOI: 10.3892/ol.2023.13895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 05/22/2023] [Indexed: 06/20/2023] Open
Abstract
The present study described an extremely rare case of acute promyelocytic leukemia (APL) characterized by a complex three-way (15;15;17)(q24;q14;q21) translocation. It was identified in a 59-year-old male through karyotype, molecular, and fluorescence in situ hybridization (FISH) analyses. The third translocation breakpoint 15q14 was identified on the same chromosome 15 that also contained the classical t(15;17)(q24;q21) and may have evolved from the classical t(15;17) clone, as indicated by interphase FISH analysis. A complex translocation involving two breakpoints on the same chromosome is extremely rare, such that this case can provide insights into complex translocations in APL.
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Affiliation(s)
- Do-Hoon Kim
- Department of Laboratory Medicine, Keimyung University School of Medicine, Daegu, North Gyeongsang 42601, Republic of Korea
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3
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Kosik P, Skorvaga M, Belyaev I. Preleukemic Fusion Genes Induced via Ionizing Radiation. Int J Mol Sci 2023; 24:ijms24076580. [PMID: 37047553 PMCID: PMC10095576 DOI: 10.3390/ijms24076580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/28/2023] [Accepted: 03/29/2023] [Indexed: 04/05/2023] Open
Abstract
Although the prevalence of leukemia is increasing, the agents responsible for this increase are not definitely known. While ionizing radiation (IR) was classified as a group one carcinogen by the IARC, the IR-induced cancers, including leukemia, are indistinguishable from those that are caused by other factors, so the risk estimation relies on epidemiological data. Several epidemiological studies on atomic bomb survivors and persons undergoing IR exposure during medical investigations or radiotherapy showed an association between radiation and leukemia. IR is also known to induce chromosomal translocations. Specific chromosomal translocations resulting in preleukemic fusion genes (PFGs) are generally accepted to be the first hit in the onset of many leukemias. Several studies indicated that incidence of PFGs in healthy newborns is up to 100-times higher than childhood leukemia with the same chromosomal aberrations. Because of this fact, it has been suggested that PFGs are not able to induce leukemia alone, but secondary mutations are necessary. PFGs also have to occur in specific cell populations of hematopoetic stem cells with higher leukemogenic potential. In this review, we describe the connection between IR, PFGs, and cancer, focusing on recurrent PFGs where an association with IR has been established.
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Affiliation(s)
- Pavol Kosik
- Department of Radiobiology, Cancer Research Institute, Biomedical Research Center, Slovak Academy of Sciences, 845 05 Bratislava, Slovakia
| | - Milan Skorvaga
- Department of Radiobiology, Cancer Research Institute, Biomedical Research Center, Slovak Academy of Sciences, 845 05 Bratislava, Slovakia
| | - Igor Belyaev
- Department of Radiobiology, Cancer Research Institute, Biomedical Research Center, Slovak Academy of Sciences, 845 05 Bratislava, Slovakia
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4
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Jeong H, Grimes K, Rauwolf KK, Bruch PM, Rausch T, Hasenfeld P, Benito E, Roider T, Sabarinathan R, Porubsky D, Herbst SA, Erarslan-Uysal B, Jann JC, Marschall T, Nowak D, Bourquin JP, Kulozik AE, Dietrich S, Bornhauser B, Sanders AD, Korbel JO. Functional analysis of structural variants in single cells using Strand-seq. Nat Biotechnol 2022:10.1038/s41587-022-01551-4. [PMID: 36424487 DOI: 10.1038/s41587-022-01551-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 10/07/2022] [Indexed: 11/27/2022]
Abstract
Somatic structural variants (SVs) are widespread in cancer, but their impact on disease evolution is understudied due to a lack of methods to directly characterize their functional consequences. We present a computational method, scNOVA, which uses Strand-seq to perform haplotype-aware integration of SV discovery and molecular phenotyping in single cells by using nucleosome occupancy to infer gene expression as a readout. Application to leukemias and cell lines identifies local effects of copy-balanced rearrangements on gene deregulation, and consequences of SVs on aberrant signaling pathways in subclones. We discovered distinct SV subclones with dysregulated Wnt signaling in a chronic lymphocytic leukemia patient. We further uncovered the consequences of subclonal chromothripsis in T cell acute lymphoblastic leukemia, which revealed c-Myb activation, enrichment of a primitive cell state and informed successful targeting of the subclone in cell culture, using a Notch inhibitor. By directly linking SVs to their functional effects, scNOVA enables systematic single-cell multiomic studies of structural variation in heterogeneous cell populations.
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Affiliation(s)
- Hyobin Jeong
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany.,Hanyang Institute of Bioscience and Biotechnology, Hanyang University, Seoul, Republic of Korea
| | - Karen Grimes
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany.,Faculty of Biosciences, EMBL and Heidelberg University, Heidelberg, Germany
| | - Kerstin K Rauwolf
- Division of Pediatric Oncology, University Children's Hospital, Zürich, Switzerland
| | - Peter-Martin Bruch
- Department of Hematology, Oncology and Rheumatology, Heidelberg University Hospital, Heidelberg, Germany.,Molecular Medicine Partnership Unit, European Molecular Biology Laboratory, University of Heidelberg, Heidelberg, Germany.,Department of Hematology and Oncology, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Tobias Rausch
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany.,Molecular Medicine Partnership Unit, European Molecular Biology Laboratory, University of Heidelberg, Heidelberg, Germany
| | - Patrick Hasenfeld
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Eva Benito
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Tobias Roider
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany.,Department of Hematology, Oncology and Rheumatology, Heidelberg University Hospital, Heidelberg, Germany.,Molecular Medicine Partnership Unit, European Molecular Biology Laboratory, University of Heidelberg, Heidelberg, Germany
| | | | - David Porubsky
- Center for Bioinformatics, Saarland University, Saarbrücken, Germany.,Max Planck Institute for Informatics, Saarbrücken, Germany.,Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, USA
| | - Sophie A Herbst
- Department of Hematology, Oncology and Rheumatology, Heidelberg University Hospital, Heidelberg, Germany.,Molecular Medicine Partnership Unit, European Molecular Biology Laboratory, University of Heidelberg, Heidelberg, Germany
| | - Büşra Erarslan-Uysal
- Molecular Medicine Partnership Unit, European Molecular Biology Laboratory, University of Heidelberg, Heidelberg, Germany.,Department of Pediatric Oncology, Hematology, and Immunology, University of Heidelberg and Hopp Children's Cancer Center, Heidelberg, Germany
| | - Johann-Christoph Jann
- Department of Hematology and Oncology, Medical Faculty Mannheim of the Heidelberg University, Heidelberg, Germany
| | - Tobias Marschall
- Institute for Medical Biometry and Bioinformatics, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Daniel Nowak
- Department of Hematology and Oncology, Medical Faculty Mannheim of the Heidelberg University, Heidelberg, Germany
| | - Jean-Pierre Bourquin
- Division of Pediatric Oncology, University Children's Hospital, Zürich, Switzerland
| | - Andreas E Kulozik
- Molecular Medicine Partnership Unit, European Molecular Biology Laboratory, University of Heidelberg, Heidelberg, Germany.,Department of Pediatric Oncology, Hematology, and Immunology, University of Heidelberg and Hopp Children's Cancer Center, Heidelberg, Germany
| | - Sascha Dietrich
- Department of Hematology, Oncology and Rheumatology, Heidelberg University Hospital, Heidelberg, Germany.,Molecular Medicine Partnership Unit, European Molecular Biology Laboratory, University of Heidelberg, Heidelberg, Germany.,Department of Hematology and Oncology, University Hospital Düsseldorf, Düsseldorf, Germany.,Department of Translational Medical Oncology, National Center for Tumor Diseases (NCT) Heidelberg and German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Beat Bornhauser
- Division of Pediatric Oncology, University Children's Hospital, Zürich, Switzerland
| | - Ashley D Sanders
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany. .,Berlin Institute for Medical Systems Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany. .,Berlin Institute of Health (BIH), Berlin, Germany. .,Charité-Universitätsmedizin, Berlin, Germany.
| | - Jan O Korbel
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany. .,Molecular Medicine Partnership Unit, European Molecular Biology Laboratory, University of Heidelberg, Heidelberg, Germany. .,Bridging Research Division on Mechanisms of Genomic Variation and Data Science, German Cancer Research Center (DKFZ), Heidelberg, Germany.
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5
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Cheng Z, Wang Y, Guo L, Li J, Zhang W, Zhang C, Liu Y, Huang Y, Xu K. Ku70 affects the frequency of chromosome translocation in human lymphocytes after radiation and T-cell acute lymphoblastic leukemia. Radiat Oncol 2022; 17:144. [PMID: 35986335 PMCID: PMC9389784 DOI: 10.1186/s13014-022-02113-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 08/05/2022] [Indexed: 11/23/2022] Open
Abstract
Background As one of the most common chromosomal causes, chromosome translocation leads to T-cell acute lymphoblastic leukemia (T-ALL). Ku70 is one of the key factors of error-prone DNA repair and it may end in translocation. So far, the direct correlation between Ku70 and translocation has not been assessed. This study aimed to investigate the association between Ku70 and translocation in human lymphocytes after radiation and T-ALL. Methods Peripheral blood lymphocytes (PBLs) from volunteers and human lymphocyte cell line AHH-1 were irradiated with X-rays to form the chromosome translocations. Phytohemagglutinin (PHA) was used to stimulate lymphocytes. The frequency of translocation was detected by fluorescence in situ hybridization (FISH). Meanwhile, the expression of Ku70 was detected by reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and western blot. Furthermore, Ku70 interference, overexpression and chemical inhibition were used in AHH-1 cell lines to confirm the correlation. Finally, the expression of Ku70 in T-ALL samples with or without translocation was detected. Results The expression of Ku70 and frequencies of translocation were both significantly increased in PBLs after being irradiated by X-rays, and a positive correlation between the expression (both mRNA and protein level) of Ku70 and the frequency of translocation was detected (r = 0.4877, P = 0.004; r = 0.3038, P = 0.0358 respectively). Moreover, Ku70 interference decreased the frequency of translocations, while the frequency of translocations was not significantly affected after Ku70 overexpression. The expression of Ku70 and frequencies of translocation were both significantly increased in cells after irradiation, combined with chemical inhibition (P < 0.01). The protein level and mRNA level of Ku70 in T-ALL with translocation were obviously higher than T-ALL with normal karyotype (P = 0.009, P = 0.049 respectively). Conclusions Ku70 is closely associated with the frequency of chromosome translocation in human lymphocytes after radiation and T-ALL. Ku70 might be a radiation damage biomarker and a potential tumor therapy target. Supplementary Information The online version contains supplementary material available at 10.1186/s13014-022-02113-3.
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6
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Atkin ND, Raimer HM, Wang Z, Zang C, Wang YH. Assessing acute myeloid leukemia susceptibility in rearrangement-driven patients by DNA breakage at topoisomerase II and CCCTC-binding factor/cohesin binding sites. Genes Chromosomes Cancer 2021; 60:808-821. [PMID: 34405474 PMCID: PMC8511143 DOI: 10.1002/gcc.22993] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 08/12/2021] [Accepted: 08/14/2021] [Indexed: 12/29/2022] Open
Abstract
An initiating DNA double strand break (DSB) event precedes the formation of cancer-driven chromosomal abnormalities, such as gene rearrangements. Therefore, measuring DNA breaks at rearrangement-participating regions can provide a unique tool to identify and characterize susceptible individuals. Here, we developed a highly sensitive and low-input DNA break mapping method, the first of its kind for patient samples. We then measured genome-wide DNA breakage in normal cells of acute myeloid leukemia (AML) patients with KMT2A (previously MLL) rearrangements, compared to that of nonfusion AML individuals, as a means to evaluate individual susceptibility to gene rearrangements. DNA breakage at the KMT2A gene region was significantly greater in fusion-driven remission individuals, as compared to nonfusion individuals. Moreover, we identified select topoisomerase II (TOP2)-sensitive and CCCTC-binding factor (CTCF)/cohesin-binding sites with preferential DNA breakage in fusion-driven patients. Importantly, measuring DSBs at these sites, in addition to the KMT2A gene region, provided greater predictive power when assessing individual break susceptibility. We also demonstrated that low-dose etoposide exposure further elevated DNA breakage at these regions in fusion-driven AML patients, but not in nonfusion patients, indicating that these sites are preferentially sensitive to TOP2 activity in fusion-driven AML patients. These results support that mapping of DSBs in patients enables discovery of novel break-prone regions and monitoring of individuals susceptible to chromosomal abnormalities, and thus cancer. This will build the foundation for early detection of cancer-susceptible individuals, as well as those preferentially susceptible to therapy-related malignancies caused by treatment with TOP2 poisons.
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MESH Headings
- Binding Sites/genetics
- CCCTC-Binding Factor/blood
- CCCTC-Binding Factor/genetics
- Cell Cycle Proteins/blood
- Cell Cycle Proteins/genetics
- Chondroitin Sulfate Proteoglycans/blood
- Chondroitin Sulfate Proteoglycans/genetics
- Chromosomal Proteins, Non-Histone/blood
- Chromosomal Proteins, Non-Histone/genetics
- Chromosome Aberrations
- DNA Breaks, Double-Stranded/drug effects
- DNA Repair/genetics
- DNA Topoisomerases, Type II/blood
- DNA Topoisomerases, Type II/genetics
- DNA-Binding Proteins/blood
- DNA-Binding Proteins/genetics
- Etoposide/pharmacology
- Female
- Gene Rearrangement/genetics
- Genome, Human/genetics
- HeLa Cells
- Histone-Lysine N-Methyltransferase/blood
- Histone-Lysine N-Methyltransferase/genetics
- Humans
- Leukemia, Myeloid, Acute/blood
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/pathology
- Male
- Myeloid-Lymphoid Leukemia Protein/blood
- Myeloid-Lymphoid Leukemia Protein/genetics
- Oncogene Proteins, Fusion/genetics
- Poly-ADP-Ribose Binding Proteins/blood
- Poly-ADP-Ribose Binding Proteins/genetics
- Cohesins
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Affiliation(s)
- Naomi D. Atkin
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, Virginia, 22908-0733, USA
| | - Heather M. Raimer
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, Virginia, 22908-0733, USA
| | - Zhenjia Wang
- Center for Public Health Genomics, University of Virginia School of Medicine, Charlottesville, Virginia, 22908-0733, USA
| | - Chongzhi Zang
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, Virginia, 22908-0733, USA
- Center for Public Health Genomics, University of Virginia School of Medicine, Charlottesville, Virginia, 22908-0733, USA
- Department of Public Health Sciences, University of Virginia School of Medicine, Charlottesville, Virginia, 22908-0733, USA
| | - Yuh-Hwa Wang
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, Virginia, 22908-0733, USA
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7
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Divergent leukaemia subclones as cellular models for testing vulnerabilities associated with gains in chromosomes 7, 8 or 18. Sci Rep 2021; 11:21145. [PMID: 34707142 PMCID: PMC8551338 DOI: 10.1038/s41598-021-00623-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 10/08/2021] [Indexed: 11/24/2022] Open
Abstract
Haematopoietic malignancies are frequently characterized by karyotypic abnormalities. The development of targeted drugs has been pioneered with compounds against gene products of fusion genes caused by chromosomal translocations. While polysomies are equally frequent as translocations, for many of them we are lacking therapeutic approaches aimed at synthetic lethality. Here, we report two new cell lines, named MBU-7 and MBU-8, that differ in complete trisomy of chromosome18, a partial trisomy of chromosome 7 and a tetrasomy of the p-arm of chromosome 8, but otherwise share the same mutational pattern and complex karyotype. Both cell lines are divergent clones of U-937 cells and have the morphology and immunoprofile of monocytic cells. The distinct karyotypic differences between MBU-7 and MBU-8 are associated with a difference in the specific response to nucleoside analogues. Taken together, we propose the MBU-7 and MBU-8 cell lines described here as suitable in vitro models for screening and testing vulnerabilities that are associated with the disease-relevant polysomies of chromosome 7, 8 and 18.
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8
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Rall-Scharpf M, Friedl TWP, Biechonski S, Denkinger M, Milyavsky M, Wiesmüller L. Sex-specific differences in DNA double-strand break repair of cycling human lymphocytes during aging. Aging (Albany NY) 2021; 13:21066-21089. [PMID: 34506302 PMCID: PMC8457596 DOI: 10.18632/aging.203519] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 08/10/2021] [Indexed: 12/15/2022]
Abstract
The gender gap in life expectancy and cancer incidence suggests differences in the aging process between the sexes. Genomic instability has been recognized as a key factor in aging, but little is known about sex-specific differences. Therefore, we analyzed DNA double-strand break (DSB) repair in cycling human peripheral blood lymphocytes (PBL) from male and female donors of different age. Reporter-based DSB repair analyses revealed differential regulation of pathway usage in PBL from male and female donors with age: Non-homologous end joining (NHEJ) was inversely regulated in men and women; the activity of pathways requiring end processing and strand annealing steps such as microhomology-mediated end joining (MMEJ) declined with age in women but not in men. Screening candidate proteins identified the NHEJ protein KU70 as well as the end resection regulatory factors ATM and BLM showing reduced expression during aging in women. Consistently, the regulatory factor BLM contributed to the MMEJ proficiency in young but not in old women as demonstrated by knockdown analysis. In conclusion, we show that DSB repair is subject to changes upon aging and age-related changes in DSB repair are distinct in men and women.
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Affiliation(s)
| | - Thomas W P Friedl
- Department of Obstetrics and Gynecology, Ulm University, Ulm, Germany
| | - Shahar Biechonski
- Department of Pathology, Sackler Faculty of Medicine, Tel Aviv University, Tel-Aviv, Israel
| | - Michael Denkinger
- Institute for Geriatric Research Unit, Agaplesion Bethesda Hospital, Ulm University, Ulm, Germany
| | - Michael Milyavsky
- Department of Pathology, Sackler Faculty of Medicine, Tel Aviv University, Tel-Aviv, Israel
| | - Lisa Wiesmüller
- Department of Obstetrics and Gynecology, Ulm University, Ulm, Germany
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9
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Abstract
Cancer is an unpleasant, painful disease. It is one of the most devastating diseases worldwide diminishing many lives. Many genetic and epigenetic changes occur before cancer develops. Mutation in SETD2 gene is one such example. RNA splicing, DNA damage repair, DNA methylation and histone methylation are some of the biological processes mediated by SETD2. SETD2 (histone H3 lysine 36 methyltransferase) is a frequently mutated gene in different types of cancer. Loss of SETD2 is associated with worse prognosis and aggressive phenotypes. Histone modification is one of the epigenetic regulation having a significant effect on gene regulation. N6-methyladenosine (m6A) mRNA modification is a well-known posttranscriptional modification playing a pivotal role in many normal and pathological processes affecting RNA metabolism. SETD2 catalyses H3K36 trimethylation and in turn H3K36me3 guides the deposition of m6A on nascent RNA transcripts. Finally, this review summarizes the deep understanding of the role of SETD2 in RNA methylation/modification and how SETD2 mutation contributes to tumour development.
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10
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Abstract
The genetic basis for pediatric acute myeloid leukemia (AML) is highly heterogeneous, often involving the cooperative action of characteristic chromosomal rearrangements and somatic mutations in progrowth and antidifferentiation pathways that drive oncogenesis. Although some driver mutations are shared with adult AML, many genetic lesions are unique to pediatric patients, and their appropriate identification is essential for patient care. The increased understanding of these malignancies through broad genomic studies has begun to risk-stratify patients based on their combinations of genomic alterations, a trend that will enable precision medicine in this population.
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Affiliation(s)
- Bryan Krock
- Caris Life Sciences, 4610 South 44th Place, Phoenix, AZ, USA
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11
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Wang WJ, Li LY, Cui JW. Chromosome structural variation in tumorigenesis: mechanisms of formation and carcinogenesis. Epigenetics Chromatin 2020; 13:49. [PMID: 33168103 PMCID: PMC7654176 DOI: 10.1186/s13072-020-00371-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 10/29/2020] [Indexed: 12/23/2022] Open
Abstract
With the rapid development of next-generation sequencing technology, chromosome structural variation has gradually gained increased clinical significance in tumorigenesis. However, the molecular mechanism(s) underlying this structural variation remain poorly understood. A search of the literature shows that a three-dimensional chromatin state plays a vital role in inducing structural variation and in the gene expression profiles in tumorigenesis. Structural variants may result in changes in copy number or deletions of coding sequences, as well as the perturbation of structural chromatin features, especially topological domains, and disruption of interactions between genes and their regulatory elements. This review focuses recent work aiming at elucidating how structural variations develop and misregulate oncogenes and tumor suppressors, to provide general insights into tumor formation mechanisms and to provide potential targets for future anticancer therapies.
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Affiliation(s)
- Wen-Jun Wang
- Cancer Center, The First Hospital of Jilin University, Jilin University, Changchun, 130021 Jilin China
| | - Ling-Yu Li
- Cancer Center, The First Hospital of Jilin University, Jilin University, Changchun, 130021 Jilin China
| | - Jiu-Wei Cui
- Cancer Center, The First Hospital of Jilin University, Jilin University, Changchun, 130021 Jilin China
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12
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Polymerase δ promotes chromosomal rearrangements and imprecise double-strand break repair. Proc Natl Acad Sci U S A 2020; 117:27566-27577. [PMID: 33077594 DOI: 10.1073/pnas.2014176117] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Recent studies have implicated DNA polymerases θ (Pol θ) and β (Pol β) as mediators of alternative nonhomologous end-joining (Alt-NHEJ) events, including chromosomal translocations. Here we identify subunits of the replicative DNA polymerase δ (Pol δ) as promoters of Alt-NHEJ that results in more extensive intrachromosomal mutations at a single double-strand break (DSB) and more frequent translocations between two DSBs. Depletion of the Pol δ accessory subunit POLD2 destabilizes the complex, resulting in degradation of both POLD1 and POLD3 in human cells. POLD2 depletion markedly reduces the frequency of translocations with sequence modifications but does not affect the frequency of translocations with exact joins. Using separation-of-function mutants, we show that both the DNA synthesis and exonuclease activities of the POLD1 subunit contribute to translocations. As described in yeast and unlike Pol θ, Pol δ also promotes homology-directed repair. Codepletion of POLD2 with 53BP1 nearly eliminates translocations. POLD1 and POLD2 each colocalize with phosphorylated H2AX at ionizing radiation-induced DSBs but not with 53BP1. Codepletion of POLD2 with either ligase 3 (LIG3) or ligase 4 (LIG4) does not further reduce translocation frequency compared to POLD2 depletion alone. Together, these data support a model in which Pol δ promotes Alt-NHEJ in human cells at DSBs, including translocations.
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13
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Gothe HJ, Bouwman BAM, Gusmao EG, Piccinno R, Petrosino G, Sayols S, Drechsel O, Minneker V, Josipovic N, Mizi A, Nielsen CF, Wagner EM, Takeda S, Sasanuma H, Hudson DF, Kindler T, Baranello L, Papantonis A, Crosetto N, Roukos V. Spatial Chromosome Folding and Active Transcription Drive DNA Fragility and Formation of Oncogenic MLL Translocations. Mol Cell 2019; 75:267-283.e12. [DOI: 10.1016/j.molcel.2019.05.015] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 04/14/2019] [Accepted: 05/09/2019] [Indexed: 01/21/2023]
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14
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Mansouri N, Alivand MR, Bayat S, Khaniani MS, Derakhshan SM. The hopeful anticancer role of oleuropein in breast cancer through histone deacetylase modulation. J Cell Biochem 2019; 120:17042-17049. [PMID: 31119806 DOI: 10.1002/jcb.28965] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 02/26/2019] [Accepted: 02/28/2019] [Indexed: 12/24/2022]
Abstract
Breast cancer (BC) is one of the most common cancers among women worldwide. Genetic, epigenetic, and environmental factors play a crucial role in BC development. Because epigenetic imbalance occurs earlier than expression in carcinogenesis and is reversible, epigenetic reprogramming strategies could be more useful for cancer prevention and therapy. There is evidence indicating that the use of herbal compounds with low toxicity can offer a real benefit in the prevention or treatment of cancer. Oleuropein (OLE), as a natural polyphenol, has shown the anticancer property in cancers. In this study, we investigated for the first time the link between histone deacetylase (HDAC) and OLE to have an anticancer effect in BC. The potential apoptotic and anti-invasive effects of OLE were tested using MCF-7 cells. Transcript expression of HDAC1 and HDAC4 genes after treatment was determined using quantitative reverse transcription polymerase chain reaction. OLE obviously reduced invasiveness and cell viability and simultaneously induced cell apoptosis in MCF-7 cancer cells. Dose-dependent reduction of HDAC4 was observed, whereas apparent changes could not be observed in HDAC1 expression. The current research indicated that OLE can inhibit proliferation and invasion of cells by inducing apoptosis likely through modulation of an important epigenetic factor, HDAC4, in MCF-7 cells. OLE has the potential to be a therapeutic drug for BC prevention and treatment.
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Affiliation(s)
- Neda Mansouri
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Faculty of Basic Sciences, Tabriz Branch, Islamic Azad University, Tabriz, Iran
| | - Mohammad Reza Alivand
- Department of Medical Genetics, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sahar Bayat
- Faculty of Basic Sciences, Tabriz Branch, Islamic Azad University, Tabriz, Iran
| | - Mahmoud Shekari Khaniani
- Faculty of Basic Sciences, Tabriz Branch, Islamic Azad University, Tabriz, Iran.,Department of Medical Genetics, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sima Mansoori Derakhshan
- Faculty of Basic Sciences, Tabriz Branch, Islamic Azad University, Tabriz, Iran.,Department of Medical Genetics, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
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15
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Zhang W, Wang G, Liang A. DNA Damage Response in Quiescent Hematopoietic Stem Cells and Leukemia Stem Cells. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1143:147-171. [PMID: 31338819 DOI: 10.1007/978-981-13-7342-8_7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In humans, hematopoietic stem cells (HSCs) adopt unique responsive pathways counteracting with the DNA-damaging assaults to weigh the balance between the maintenance of normal stem cell poor for whole-life blood regeneration and the transformation to leukemia stem cells (LSCs) for leukemia initiation. LSCs also take actions of combating with the attack launched by externally therapeutic drugs that can kill most leukemic cells, to avoid extermination and promote disease relapse. Therefore, the collection of knowledge about all these underlined mechanisms would present a preponderance for later studies. In this chapter, the universal DNA damage response (DDR) mechanisms were firstly introduced, and then DDR of HSCs were presented focusing on the DNA double-strand breaks in the quiescent state of HSCs, which poses a big advantage in promoting its transformation into preleukemic HSCs. Lastly, the DDR of LSCs were summarized based on the major outcomes triggered by different pathways in specific leukemia, upon which some aspects for future investigations were envisioned under our currently limited scope of knowledge.
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Affiliation(s)
- Wenjun Zhang
- Department of Hematology, Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Guangming Wang
- Department of Hematology, Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Aibin Liang
- Department of Hematology, Tongji Hospital, Tongji University School of Medicine, Shanghai, China.
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16
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Bouwman BAM, Crosetto N. Endogenous DNA Double-Strand Breaks during DNA Transactions: Emerging Insights and Methods for Genome-Wide Profiling. Genes (Basel) 2018; 9:E632. [PMID: 30558210 PMCID: PMC6316733 DOI: 10.3390/genes9120632] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 12/11/2018] [Accepted: 12/12/2018] [Indexed: 02/07/2023] Open
Abstract
DNA double-strand breaks (DSBs) jeopardize genome integrity and can-when repaired unfaithfully-give rise to structural rearrangements associated with cancer. Exogenous agents such as ionizing radiation or chemotherapy can invoke DSBs, but a vast amount of breakage arises during vital endogenous DNA transactions, such as replication and transcription. Additionally, chromatin looping involved in 3D genome organization and gene regulation is increasingly recognized as a possible contributor to DSB events. In this review, we first discuss insights into the mechanisms of endogenous DSB formation, showcasing the trade-off between essential DNA transactions and the intrinsic challenges that these processes impose on genomic integrity. In the second part, we highlight emerging methods for genome-wide profiling of DSBs, and discuss future directions of research that will help advance our understanding of genome-wide DSB formation and repair.
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Affiliation(s)
- Britta A M Bouwman
- Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17165 Stockholm, Sweden.
| | - Nicola Crosetto
- Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17165 Stockholm, Sweden.
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17
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Lv L, Yang L, Cui H, Ma T. A complex translocation (1;17;15) with spliced short-type PML-RARA fusion transcripts in acute promyelocytic leukemia: A case report. Exp Ther Med 2018; 17:1360-1366. [PMID: 30680014 PMCID: PMC6327484 DOI: 10.3892/etm.2018.7091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 10/26/2018] [Indexed: 11/08/2022] Open
Abstract
The promyelocytic leukemia (PML)-retinoic acid receptor α (RARA) fusion is hypothesized to serve a vital role in the pathogenesis of acute promyelocytic leukemia (APL), which results from a reciprocal translocation between chromosomes 15 and 17, t(15;17)(q24;q21). A minority of APL cases lack the classical t(15;17) and have been identified to have cryptic or masked t(15;17) or complex translocations. The present study reports on a case of a 37-year-old male with APL harboring a complex three-way translocation t(1;17;15)(q21;q21;q24). This karyotypic interpretation was further confirmed by fluorescence in situ hybridization, and 98% of the bone marrow cells analyzed were positive for the PML-RARA fusion gene. After combined treatment with all-trans retinoic acid and arsenic trioxide, the patient achieved complete remission with no recurrence for 3 years to date. To the best of our knowledge, the present study is the first to report on the novel variant of t(15;17) involving the breakpoint 1q21.
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Affiliation(s)
- Lili Lv
- Department of Oncology and Hematology, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Longfei Yang
- Jilin Provincial Key Laboratory on Molecular and Chemical Genetics, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Honghua Cui
- Department of Oncology and Hematology, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Tonghui Ma
- Jilin Provincial Key Laboratory on Molecular and Chemical Genetics, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
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18
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Pashaiefar H, Yaghmaie M, Tavakkoly-Bazzaz J, Hamidollah Ghaffari S, Alimoghaddam K, Izadi P, Ghavamzadeh A. The Association between PARP1 and LIG3 Expression Levels and Chromosomal Translocations in Acute Myeloid Leukemia Patients. CELL JOURNAL 2018; 20:204-210. [PMID: 29633598 PMCID: PMC5893292 DOI: 10.22074/cellj.2018.5210] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Accepted: 07/24/2017] [Indexed: 11/04/2022]
Abstract
OBJECTIVES Chromosomal translocations are among the most common mutational events in cancer development, especially in hematologic malignancies. However, the precise molecular mechanism of these events is still not clear. It has been recently shown that alternative non-homologous end-joining (alt-NHEJ), a newly described pathway for double-stranded DNA break repair, mediates the formation of chromosomal translocations. Here, we examined the expression levels of the main components of alt-NHEJ (PARP1 and LIG3) in acute myeloid leukemia (AML) patients and assessed their potential correlation with the formation of chromosomal translocations. MATERIALS AND METHODS This experimental study used reverse transcription-quantitative polymerase chain reaction (RTqPCR) to quantify the expression levels of PARP1 and LIG3 at the transcript level in AML patients (n=78) and healthy individuals (n=19). RESULTS PARP1 was the only gene overexpressed in the AML group when compared with healthy individuals (P=0.0004), especially in the poor prognosis sub-group. Both genes were, however, found to be up-regulated in AML patients with chromosomal translocations (P=0.04 and 0.0004 respectively). Moreover, patients with one isolated translocation showed an over-expression of only LIG3 (P=0.005), whereas those with two or more translocations over-expressed both LIG3 (P=0.002) and PARP1 (P=0.02). CONCLUSIONS The significant correlations observed between PARP1 and LIG3 expression and the rate of chromosomal translocations in AML patients provides a molecular context for further studies to investigate the causality of this association.
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Affiliation(s)
- Hossein Pashaiefar
- Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.,Hematology, Oncology and Stem Cell Transplantation Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Marjan Yaghmaie
- Hematology, Oncology and Stem Cell Transplantation Research Center, Tehran University of Medical Sciences, Tehran, Iran.
| | - Javad Tavakkoly-Bazzaz
- Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Seyed Hamidollah Ghaffari
- Hematology, Oncology and Stem Cell Transplantation Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Kamran Alimoghaddam
- Hematology, Oncology and Stem Cell Transplantation Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Pantea Izadi
- Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Ardeshir Ghavamzadeh
- Hematology, Oncology and Stem Cell Transplantation Research Center, Tehran University of Medical Sciences, Tehran, Iran
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19
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Jobst-Schwan T, Schmidt JM, Schneider R, Hoogstraten CA, Ullmann JFP, Schapiro D, Majmundar AJ, Kolb A, Eddy K, Shril S, Braun DA, Poduri A, Hildebrandt F. Acute multi-sgRNA knockdown of KEOPS complex genes reproduces the microcephaly phenotype of the stable knockout zebrafish model. PLoS One 2018; 13:e0191503. [PMID: 29346415 PMCID: PMC5773193 DOI: 10.1371/journal.pone.0191503] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 01/05/2018] [Indexed: 02/06/2023] Open
Abstract
Until recently, morpholino oligonucleotides have been widely employed in zebrafish as an acute and efficient loss-of-function assay. However, off-target effects and reproducibility issues when compared to stable knockout lines have compromised their further use. Here we employed an acute CRISPR/Cas approach using multiple single guide RNAs targeting simultaneously different positions in two exemplar genes (osgep or tprkb) to increase the likelihood of generating mutations on both alleles in the injected F0 generation and to achieve a similar effect as morpholinos but with the reproducibility of stable lines. This multi single guide RNA approach resulted in median likelihoods for at least one mutation on each allele of >99% and sgRNA specific insertion/deletion profiles as revealed by deep-sequencing. Immunoblot showed a significant reduction for Osgep and Tprkb proteins. For both genes, the acute multi-sgRNA knockout recapitulated the microcephaly phenotype and reduction in survival that we observed previously in stable knockout lines, though milder in the acute multi-sgRNA knockout. Finally, we quantify the degree of mutagenesis by deep sequencing, and provide a mathematical model to quantitate the chance for a biallelic loss-of-function mutation. Our findings can be generalized to acute and stable CRISPR/Cas targeting for any zebrafish gene of interest.
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Affiliation(s)
- Tilman Jobst-Schwan
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Johanna Magdalena Schmidt
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Ronen Schneider
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Charlotte A. Hoogstraten
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Jeremy F. P. Ullmann
- Epilepsy Genetics Program and F.M. Kirby Neurobiology Center, Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - David Schapiro
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Amar J. Majmundar
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Amy Kolb
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Kaitlyn Eddy
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Shirlee Shril
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Daniela A. Braun
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Annapurna Poduri
- Epilepsy Genetics Program and F.M. Kirby Neurobiology Center, Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Friedhelm Hildebrandt
- Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail:
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20
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Screening of Pesticides with the Potential of Inducing DSB and Successive Recombinational Repair. J Toxicol 2017; 2017:3574840. [PMID: 29129974 PMCID: PMC5654340 DOI: 10.1155/2017/3574840] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 08/05/2017] [Accepted: 08/15/2017] [Indexed: 01/28/2023] Open
Abstract
A study was realized to ascertain whether eight selected pesticides would induce double strand breaks (DSB) in lymphocyte cultures and whether this damage would induce greater levels of proteins Rad51 participating in homologous recombination or of p-Ku80 participating in nonhomologous end joining. Only five pesticides were found to induce DSB of which only glyphosate and paraoxon induced a significant increase of p-Ku80 protein, indicating that nonhomologous end joining recombinational DNA repair system would be activated. The type of gamma-H2AX foci observed was comparable to that induced by etoposide at similar concentrations. These results are of importance since these effects occurred at low concentrations in the micromolar range, in acute treatments to the cells. Effects over longer exposures in actual environmental settings are expected to produce cumulative damage if repeated events of recombination take place over time.
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21
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Hong D, Messier TL, Tye CE, Dobson JR, Fritz AJ, Sikora KR, Browne G, Stein JL, Lian JB, Stein GS. Runx1 stabilizes the mammary epithelial cell phenotype and prevents epithelial to mesenchymal transition. Oncotarget 2017; 8:17610-17627. [PMID: 28407681 PMCID: PMC5392273 DOI: 10.18632/oncotarget.15381] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 01/16/2017] [Indexed: 11/28/2022] Open
Abstract
Runx1 is a well characterized transcription factor essential for hematopoietic differentiation and Runx1 mutations are the cause of leukemias. Runx1 is highly expressed in normal epithelium of most glands and recently has been associated with solid tumors. Notably, the function of Runx1 in the mammary gland and how it is involved in initiation and progression of breast cancer is still unclear. Here we demonstrate the consequences of Runx1 loss in normal mammary epithelial and breast cancer cells. We first observed that Runx1 is decreased in tumorigenic and metastatic breast cancer cells. We also observed loss of Runx1 expression upon induction of epithelial-mesenchymal transition (EMT) in MCF10A (normal-like) cells. Furthermore depletion of Runx1 in MCF10A cells resulted in striking changes in cell shape, leading to mesenchymal cell morphology. The epithelial phenotype could be restored in breast cancer cells by re-expressing Runx1. Analyses of breast tumors and patient data revealed that low Runx1 expression is associated with poor prognosis and decreased survival. We addressed mechanisms for the function of Runx1 in maintaining the epithelial phenotype and find Runx1 directly regulates E-cadherin; and serves as a downstream transcription factor mediating TGFβ signaling. We also observed through global gene expression profiling of growth factor depleted cells that induction of EMT and loss of Runx1 is associated with activation of TGFβ and WNT pathways. Thus these findings have identified a novel function for Runx1 in sustaining normal epithelial morphology and preventing EMT and suggest Runx1 levels could be a prognostic indicator of tumor progression.
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Affiliation(s)
- Deli Hong
- Department of Biochemistry and University of Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT, USA.,Department of Cell and Developmental Biology, University of Massachusetts Medical School, Worcester, MA, USA
| | - Terri L Messier
- Department of Biochemistry and University of Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT, USA
| | - Coralee E Tye
- Department of Biochemistry and University of Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT, USA
| | - Jason R Dobson
- Department of Cell and Developmental Biology, University of Massachusetts Medical School, Worcester, MA, USA
| | - Andrew J Fritz
- Department of Biochemistry and University of Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT, USA
| | - Kenneth R Sikora
- Department of Biochemistry and University of Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT, USA
| | - Gillian Browne
- Department of Biochemistry and University of Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT, USA
| | - Janet L Stein
- Department of Biochemistry and University of Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT, USA
| | - Jane B Lian
- Department of Biochemistry and University of Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT, USA
| | - Gary S Stein
- Department of Biochemistry and University of Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT, USA
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22
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Canela A, Maman Y, Jung S, Wong N, Callen E, Day A, Kieffer-Kwon KR, Pekowska A, Zhang H, Rao SSP, Huang SC, Mckinnon PJ, Aplan PD, Pommier Y, Aiden EL, Casellas R, Nussenzweig A. Genome Organization Drives Chromosome Fragility. Cell 2017; 170:507-521.e18. [PMID: 28735753 PMCID: PMC6133249 DOI: 10.1016/j.cell.2017.06.034] [Citation(s) in RCA: 246] [Impact Index Per Article: 35.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 05/22/2017] [Accepted: 06/21/2017] [Indexed: 01/06/2023]
Abstract
In this study, we show that evolutionarily conserved chromosome loop anchors bound by CCCTC-binding factor (CTCF) and cohesin are vulnerable to DNA double strand breaks (DSBs) mediated by topoisomerase 2B (TOP2B). Polymorphisms in the genome that redistribute CTCF/cohesin occupancy rewire DNA cleavage sites to novel loop anchors. While transcription- and replication-coupled genomic rearrangements have been well documented, we demonstrate that DSBs formed at loop anchors are largely transcription-, replication-, and cell-type-independent. DSBs are continuously formed throughout interphase, are enriched on both sides of strong topological domain borders, and frequently occur at breakpoint clusters commonly translocated in cancer. Thus, loop anchors serve as fragile sites that generate DSBs and chromosomal rearrangements. VIDEO ABSTRACT.
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Affiliation(s)
- Andres Canela
- Laboratory of Genome Integrity, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Yaakov Maman
- Laboratory of Genome Integrity, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Seolkyoung Jung
- Genomics and Immunity, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD, USA
| | - Nancy Wong
- Laboratory of Genome Integrity, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Elsa Callen
- Laboratory of Genome Integrity, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Amanda Day
- Laboratory of Genome Integrity, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Kyong-Rim Kieffer-Kwon
- Genomics and Immunity, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD, USA
| | - Aleksandra Pekowska
- Genomics and Immunity, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD, USA
| | - Hongliang Zhang
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, NIH, Bethesda, MD, USA
| | - Suhas S P Rao
- The Center for Genome Architecture, Baylor College of Medicine, Houston, TX, USA; Department of Structural Biology, Stanford University School of Medicine, Stanford, CA, USA
| | - Su-Chen Huang
- The Center for Genome Architecture, Baylor College of Medicine, Houston, TX, USA
| | - Peter J Mckinnon
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Peter D Aplan
- Genetics Branch, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Yves Pommier
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, NIH, Bethesda, MD, USA
| | - Erez Lieberman Aiden
- The Center for Genome Architecture, Baylor College of Medicine, Houston, TX, USA
| | - Rafael Casellas
- Genomics and Immunity, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD, USA
| | - André Nussenzweig
- Laboratory of Genome Integrity, National Cancer Institute, NIH, Bethesda, MD, USA.
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23
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Winters AC, Bernt KM. MLL-Rearranged Leukemias-An Update on Science and Clinical Approaches. Front Pediatr 2017; 5:4. [PMID: 28232907 PMCID: PMC5299633 DOI: 10.3389/fped.2017.00004] [Citation(s) in RCA: 265] [Impact Index Per Article: 37.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 01/09/2017] [Indexed: 12/18/2022] Open
Abstract
The mixed-lineage leukemia 1 (MLL1) gene (now renamed Lysine [K]-specific MethylTransferase 2A or KMT2A) on chromosome 11q23 is disrupted in a unique group of acute leukemias. More than 80 different partner genes in these fusions have been described, although the majority of leukemias result from MLL1 fusions with one of about six common partner genes. Approximately 10% of all leukemias harbor MLL1 translocations. Of these, two patient populations comprise the majority of cases: patients younger than 1 year of age at diagnosis (primarily acute lymphoblastic leukemias) and young- to-middle-aged adults (primarily acute myeloid leukemias). A much rarer subgroup of patients with MLL1 rearrangements develop leukemia that is attributable to prior treatment with certain chemotherapeutic agents-so-called therapy-related leukemias. In general, outcomes for all of these patients remain poor when compared to patients with non-MLL1 rearranged leukemias. In this review, we will discuss the normal biological roles of MLL1 and its fusion partners, how these roles are hypothesized to be dysregulated in the context of MLL1 rearrangements, and the clinical manifestations of this group of leukemias. We will go on to discuss the progress in clinical management and promising new avenues of research, which may lead to more effective targeted therapies for affected patients.
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Affiliation(s)
- Amanda C Winters
- Division of Pediatric Hematology/Oncology/BMT, University of Colorado School of Medicine and Children's Hospital Colorado , Aurora, CO , USA
| | - Kathrin M Bernt
- Division of Pediatric Hematology/Oncology/BMT, University of Colorado School of Medicine and Children's Hospital Colorado , Aurora, CO , USA
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24
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Daga A, Ansari A, Pandya M, Shah K, Patel S, Rawal R, Umrania V. Significant Role of Segmental Duplications and SIDD Sites in Chromosomal Translocations of Hematological Malignancies: A Multi-parametric Bioinformatic Analysis. Interdiscip Sci 2016; 10:467-475. [PMID: 27896663 DOI: 10.1007/s12539-016-0203-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 11/12/2016] [Accepted: 11/14/2016] [Indexed: 10/20/2022]
Abstract
Recurrent non-random chromosomal translocations are hallmark characteristics of leukemogenesis, and however, molecular mechanisms underlying these rearrangements are less explored. The fundamental question is, why and how chromosomes break and reunite so precisely in the genome. Meticulous understanding of mechanism leading to chromosomal rearrangement can be achieved by characterizing breakpoints. To address this hypothesis, a novel multi-parametric computational approach for characterization of major leukemic translocations within and around breakpoint region was performed. To best of our knowledge, this bioinformatic analysis is unique in finding the presence of segmental duplications (SDs) flanking breakpoints of all major leukemic translocation. Breakpoint islands (BpIs) were analyzed for stress-induced duplex destabilization (SIDD) sites along with other complex genomic architecture and physicochemical properties. Our study distinctly emphasizes on the probable correlative role of SDs, SIDD sites and various genomic features in the occurrence of breakpoints. Further, it also highlights potential features which may be playing a crucial role in causing double-strand breaks, leading to translocation.
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Affiliation(s)
- Aditi Daga
- Department of Microbiology, MVM Science College, Saurashtra University, Near Under Bridge, Kalawad Road, Rajkot, Gujarat, 360007, India
| | - Afzal Ansari
- BIT Virtual Institute of Bioinformatics (GCRI Node), GSBTM, Gandhinagar, Gujarat, India
- BIT Virtual Institute of Bioinformatics (GCRI Node), Division of Medicinal Chemistry and Pharmacogenomics, The Gujarat Cancer and Research Institute, NCH Campus, Asarwa, Ahmedabad, Gujarat, 380016, India
| | - Medha Pandya
- Department of Bioinformatics, Maharaja Krishnakumarsinhji Bhavnagar University, Bhavnagar, Gujarat, 364022, India
- Department of Physics, Maharaja Krishnakumarsinhji Bhavnagar University, Bhavnagar, Gujarat, 364022, India
| | - Krupa Shah
- Division of Medicinal Chemistry and Pharmacogenomics, Department of Cancer Biology, The Gujarat Cancer and Research Institute, NCH Campus, Asarwa, Ahmedabad, Gujarat, 380016, India
| | - Shanaya Patel
- Division of Medicinal Chemistry and Pharmacogenomics, Department of Cancer Biology, The Gujarat Cancer and Research Institute, NCH Campus, Asarwa, Ahmedabad, Gujarat, 380016, India
| | - Rakesh Rawal
- Division of Medicinal Chemistry and Pharmacogenomics, Department of Cancer Biology, The Gujarat Cancer and Research Institute, NCH Campus, Asarwa, Ahmedabad, Gujarat, 380016, India.
| | - Valentina Umrania
- Department of Microbiology, MVM Science College, Saurashtra University, Near Under Bridge, Kalawad Road, Rajkot, Gujarat, 360007, India
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25
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Chang YL, Chen HY, Chen KB, Chen KC, Chang KL, Chang PC, Chang TT, Chen YC. Investigation of the inhibitors of histone-lysine N-methyltransferase SETD2 for acute lymphoblastic leukaemia from traditional Chinese medicine. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2016; 27:589-608. [PMID: 27218135 DOI: 10.1080/1062936x.2016.1186112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 05/02/2016] [Indexed: 06/05/2023]
Abstract
Leukaemia is the leading cause of childhood malignancies. Recent research indicates that the SETD2 gene is associated with acute lymphoblastic leukaemia. This study aims to identify potential lead compounds from traditional Chinese medicine (TCM) using virtual screening for SET domain containing 2 (SETD2) protein against acute lymphoblastic leukaemia. Docking simulation was performed to determine potential candidates which obtain suitable docking poses in the binding domain of the SETD2 protein. We also performed molecular dynamics (MD) simulation to investigate the stability of docking poses of SETD2 protein complexes with the top three TCM candidates and a control. According to the results of docking and MD simulation, coniselin and coniferyl ferulate have high binding affinity and stable interactions with the SETD2 protein. Coniselin is isolated from the alcoholic extract of Comiselinum vaginatum Thell. Coniferyl ferulate can be isolated from Angelica sinensis, Poria cocos (Schw.) Wolf, and Notopterygium forbesii. Although S-adenosyl-L-homocysteine has more stable interactions with key residues in the binding domain than coniselin and coniferyl ferulate during MD simulation, the TCM compounds coniselin and coniferyl ferulate are still potential candidates as lead compounds for further study in the drug development process with the SETD2 protein against acute lymphoblastic leukaemia.
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Affiliation(s)
- Y-L Chang
- a Department of Bioinformatics and Medical Engineering , Asia University , Taichung , Taiwan
| | - H-Y Chen
- a Department of Bioinformatics and Medical Engineering , Asia University , Taichung , Taiwan
| | - K-B Chen
- a Department of Bioinformatics and Medical Engineering , Asia University , Taichung , Taiwan
- b School of Medicine , College of Medicine, China Medical University , Taichung , Taiwan
- c Department of Anesthesiology , China Medical University Hospital , Taichung , Taiwan
| | - K-C Chen
- d School of Pharmacy , China Medical University , Taichung , Taiwan
| | - K-L Chang
- a Department of Bioinformatics and Medical Engineering , Asia University , Taichung , Taiwan
- e Department of Pharmacy , China Medical University Hospital, China Medical University , Taichung , Taiwan
| | - P-C Chang
- a Department of Bioinformatics and Medical Engineering , Asia University , Taichung , Taiwan
| | - T-T Chang
- f School of Post-Baccalaureate Chinese Medicine , College of Chinese Medicine, China Medical University , Taichung , Taiwan
- g Department of Chinese Pediatrics , China Medical University Hospital , Taichung , Taiwan
| | - Y-C Chen
- a Department of Bioinformatics and Medical Engineering , Asia University , Taichung , Taiwan
- h Research Center for Chinese Medicine and Acupuncture , China Medical University , Taichung , Taiwan
- i Department of Medical Research , China Medical University Hospital , Taichung , Taiwan
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26
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Valton AL, Dekker J. TAD disruption as oncogenic driver. Curr Opin Genet Dev 2016; 36:34-40. [PMID: 27111891 DOI: 10.1016/j.gde.2016.03.008] [Citation(s) in RCA: 147] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 03/20/2016] [Accepted: 03/22/2016] [Indexed: 12/31/2022]
Abstract
Topologically Associating Domains (TADs) are conserved during evolution and play roles in guiding and constraining long-range regulation of gene expression. Disruption of TAD boundaries results in aberrant gene expression by exposing genes to inappropriate regulatory elements. Recent studies have shown that TAD disruption is often found in cancer cells and contributes to oncogenesis through two mechanisms. One mechanism locally disrupts domains by deleting or mutating a TAD boundary leading to fusion of the two adjacent TADs. The other mechanism involves genomic rearrangements that break up TADs and creates new ones without directly affecting TAD boundaries. Understanding the mechanisms by which TADs form and control long-range chromatin interactions will therefore not only provide insights into the mechanism of gene regulation in general, but will also reveal how genomic rearrangements and mutations in cancer genomes can lead to misregulation of oncogenes and tumor suppressors.
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Affiliation(s)
- Anne-Laure Valton
- Howard Hughes Medical Institute, Program in Systems Biology, Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA 01605-0103, USA
| | - Job Dekker
- Howard Hughes Medical Institute, Program in Systems Biology, Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA 01605-0103, USA.
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27
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Choi J, Polcher A, Joas A. Systematic literature review on Parkinson's disease and Childhood Leukaemia and mode of actions for pesticides. ACTA ACUST UNITED AC 2016. [DOI: 10.2903/sp.efsa.2016.en-955] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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DNA polymerases δ and λ cooperate in repairing double-strand breaks by microhomology-mediated end-joining in Saccharomyces cerevisiae. Proc Natl Acad Sci U S A 2015; 112:E6907-16. [PMID: 26607450 DOI: 10.1073/pnas.1507833112] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Maintenance of genome stability is carried out by a suite of DNA repair pathways that ensure the repair of damaged DNA and faithful replication of the genome. Of particular importance are the repair pathways, which respond to DNA double-strand breaks (DSBs), and how the efficiency of repair is influenced by sequence homology. In this study, we developed a genetic assay in diploid Saccharomyces cerevisiae cells to analyze DSBs requiring microhomologies for repair, known as microhomology-mediated end-joining (MMEJ). MMEJ repair efficiency increased concomitant with microhomology length and decreased upon introduction of mismatches. The central proteins in homologous recombination (HR), Rad52 and Rad51, suppressed MMEJ in this system, suggesting a competition between HR and MMEJ for the repair of a DSB. Importantly, we found that DNA polymerase delta (Pol δ) is critical for MMEJ, independent of microhomology length and base-pairing continuity. MMEJ recombinants showed evidence that Pol δ proofreading function is active during MMEJ-mediated DSB repair. Furthermore, mutations in Pol δ and DNA polymerase 4 (Pol λ), the DNA polymerase previously implicated in MMEJ, cause a synergistic decrease in MMEJ repair. Pol λ showed faster kinetics associating with MMEJ substrates following DSB induction than Pol δ. The association of Pol δ depended on RAD1, which encodes the flap endonuclease needed to cleave MMEJ intermediates before DNA synthesis. Moreover, Pol δ recruitment was diminished in cells lacking Pol λ. These data suggest cooperative involvement of both polymerases in MMEJ.
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29
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Costa D, Muñoz C, Carrió A, Arias A, Gómez C, Solé F, Espinet B, Azaceta G, Calasanz MJ, Nomdedeu M, Calvo X, Campo E, Nomdedeu B. Refining the Breakpoints of Three New Translocations Identified in Myelodysplastic Syndromes. Acta Haematol 2015; 135:94-100. [PMID: 26509426 DOI: 10.1159/000439161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 08/02/2015] [Indexed: 11/19/2022]
Abstract
Recurrent translocations are uncommon in myelodysplastic syndromes (MDS). Three new recurrent translocations, namely der(12)t(3;12)(q13;p13), t(11;13;22)(q13;q14;q12) and der(17)t(13;17)(q21;p13), identified by conventional cytogenetics (CC) in 4 MDS patients, were further characterized using a panel of commercial and homemade fluorescence in situ hybridization (FISH) probes. The goal of this study was to determine the precise breakpoints and to identify genes that could be related with the neoplastic process. Half of the breakpoints (4/8) were precisely identified and in the remaining half they were narrowed to a region ranging from 14 to 926 kb. All the studied breakpoints had interstitial or terminal deletions ranging from 536 kb to 89 Mb, and only those 7 Mb were detected by CC. The genes located in or around the breakpoints described in our study have not been previously related to MDS. The deleted regions include the ETV6 and RB1 genes, among others, and exclude the TP53 gene. FISH studies were useful to refine the breakpoints of the translocations, but further studies are needed to determine the role of the involved genes in the neoplastic process.
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Affiliation(s)
- Dolors Costa
- Unitat d'Hematopatologia, Hospital Clx00ED;nic, Barcelona, Spain
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30
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He MD, Zhang FH, Wang HL, Wang HP, Zhu ZY, Sun YH. Efficient ligase 3-dependent microhomology-mediated end joining repair of DNA double-strand breaks in zebrafish embryos. Mutat Res 2015; 780:86-96. [PMID: 26318124 DOI: 10.1016/j.mrfmmm.2015.08.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 07/21/2015] [Accepted: 08/14/2015] [Indexed: 02/07/2023]
Abstract
DNA double-strand break (DSB) repair is of considerable importance for genomic integrity. Homologous recombination (HR) and non-homologous end joining (NHEJ) are considered as two major mechanistically distinct pathways involved in repairing DSBs. In recent years, another DSB repair pathway, namely, microhomology-mediated end joining (MMEJ), has received increasing attention. MMEJ is generally believed to utilize an alternative mechanism to repair DSBs when NHEJ and other mechanisms fail. In this study, we utilized zebrafish as an in vivo model to study DSB repair and demonstrated that efficient MMEJ repair occurred in the zebrafish genome when DSBs were induced using TALEN (transcription activator-like effector nuclease) or CRISPR (clustered regularly interspaced short palindromic repeats)/Cas9 technologies. The wide existence of MMEJ repair events in zebrafish embryos was further demonstrated via the injection of several in vitro-designed exogenous MMEJ reporters. Interestingly, the inhibition of endogenous ligase 4 activity significantly increased MMEJ frequency, and the inhibition of ligase 3 activity severely decreased MMEJ activity. These results suggest that MMEJ in zebrafish is dependent on ligase 3 but independent of ligase 4. This study will enhance our understanding of the mechanisms of MMEJ in vivo and facilitate inducing desirable mutations via DSB-induced repair.
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Affiliation(s)
- Mu-Dan He
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Feng-Hua Zhang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Hua-Lin Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Hou-Peng Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Zuo-Yan Zhu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Yong-Hua Sun
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
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31
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Burman B, Zhang ZZ, Pegoraro G, Lieb JD, Misteli T. Histone modifications predispose genome regions to breakage and translocation. Genes Dev 2015; 29:1393-402. [PMID: 26104467 PMCID: PMC4511214 DOI: 10.1101/gad.262170.115] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 06/02/2015] [Indexed: 01/13/2023]
Abstract
Burman et al. find enrichment of several histone modifications over clinically relevant translocation-prone genome regions. Experimental modulation of histone marks sensitized genome regions to breakage by endonuclease challenge or irradiation and promoted formation of chromosome translocations. Chromosome translocations are well-established hallmarks of cancer cells and often occur at nonrandom sites in the genome. The molecular features that define recurrent chromosome breakpoints are largely unknown. Using a combination of bioinformatics, biochemical analysis, and cell-based assays, we identify here specific histone modifications as facilitators of chromosome breakage and translocations. We show enrichment of several histone modifications over clinically relevant translocation-prone genome regions. Experimental modulation of histone marks sensitizes genome regions to breakage by endonuclease challenge or irradiation and promotes formation of chromosome translocations of endogenous gene loci. Our results demonstrate that histone modifications predispose genome regions to chromosome breakage and translocations.
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Affiliation(s)
- Bharat Burman
- National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA; Program in Cell, Molecular, and Developmental Biology, Tufts University Sackler School of Biomedical Sciences, Boston, Massachusetts 02111, USA
| | - Zhuzhu Z Zhang
- Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599, USA; Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA
| | - Gianluca Pegoraro
- High-Throughput Imaging Facility, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Jason D Lieb
- Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599, USA; Department of Human Genetics, University of Chicago, Chicago, Illinois 60637, USA
| | - Tom Misteli
- National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
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32
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Andersson AK, Ma J, Wang J, Chen X, Gedman AL, Dang J, Nakitandwe J, Holmfeldt L, Parker M, Easton J, Huether R, Kriwacki R, Rusch M, Wu G, Li Y, Mulder H, Raimondi S, Pounds S, Kang G, Shi L, Becksfort J, Gupta P, Payne-Turner D, Vadodaria B, Boggs K, Yergeau D, Manne J, Song G, Edmonson M, Nagahawatte P, Wei L, Cheng C, Pei D, Sutton R, Venn NC, Chetcuti A, Rush A, Catchpoole D, Heldrup J, Fioretos T, Lu C, Ding L, Pui CH, Shurtleff S, Mullighan CG, Mardis ER, Wilson RK, Gruber TA, Zhang J, Downing JR. The landscape of somatic mutations in infant MLL-rearranged acute lymphoblastic leukemias. Nat Genet 2015; 47:330-7. [PMID: 25730765 PMCID: PMC4553269 DOI: 10.1038/ng.3230] [Citation(s) in RCA: 358] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 02/02/2015] [Indexed: 12/13/2022]
Abstract
Infant acute lymphoblastic leukemia (ALL) with MLL rearrangements (MLL-R) represents a distinct leukemia with a poor prognosis. To define its mutational landscape, we performed whole genome, exome, RNA and targeted DNA sequencing on 65 infants (47 MLL-R and 18 non-MLL-R) and 20 older children (MLL-R cases) with leukemia. Our data demonstrated infant MLL-R ALL to have one of the lowest frequencies of somatic mutations of any sequenced cancer, with the predominant leukemic clone carrying a mean of 1.3 non-silent mutations. Despite the paucity of mutations, activating mutations in kinase/PI3K/RAS signaling pathways were detected in 47%. Surprisingly, however, these mutations were often sub-clonal and frequently lost at relapse. In contrast to infant cases, MLL-R leukemia in older children had more somatic mutations (a mean of 6.5/case versus 1.3/case, P=7.15×10−5) and contained frequent mutations (45%) in epigenetic regulators, a category of genes that with the exception of MLL was rarely mutated in infant MLL-R ALL.
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Affiliation(s)
- Anna K Andersson
- 1] Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA. [2] Department of Clinical Genetics, Lund University, Lund, Sweden
| | - Jing Ma
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Jianmin Wang
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Xiang Chen
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Amanda Larson Gedman
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Jinjun Dang
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Joy Nakitandwe
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Linda Holmfeldt
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Matthew Parker
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - John Easton
- Pediatric Cancer Genome Project Laboratory, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Robert Huether
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Richard Kriwacki
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Michael Rusch
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Gang Wu
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Yongjin Li
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Heather Mulder
- Pediatric Cancer Genome Project Laboratory, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Susana Raimondi
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Stanley Pounds
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Guolian Kang
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Lei Shi
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Jared Becksfort
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Pankaj Gupta
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Debbie Payne-Turner
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Bhavin Vadodaria
- Pediatric Cancer Genome Project Laboratory, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Kristy Boggs
- Pediatric Cancer Genome Project Laboratory, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Donald Yergeau
- Pediatric Cancer Genome Project Laboratory, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Jayanthi Manne
- Pediatric Cancer Genome Project Laboratory, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Guangchun Song
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Michael Edmonson
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Panduka Nagahawatte
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Lei Wei
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Cheng Cheng
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Deqing Pei
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Rosemary Sutton
- Children's Cancer Institute Australia, Lowy Cancer Research Centre, University of New South Wales, Sydney, New South Wales, Australia
| | - Nicola C Venn
- Children's Cancer Institute Australia, Lowy Cancer Research Centre, University of New South Wales, Sydney, New South Wales, Australia
| | - Albert Chetcuti
- Tumor Bank, Children's Cancer Research Unit, Children's Hospital at Westmead, Sydney, New South Wales, Australia
| | - Amanda Rush
- Tumor Bank, Children's Cancer Research Unit, Children's Hospital at Westmead, Sydney, New South Wales, Australia
| | - Daniel Catchpoole
- Tumor Bank, Children's Cancer Research Unit, Children's Hospital at Westmead, Sydney, New South Wales, Australia
| | - Jesper Heldrup
- Department of Pediatrics, Skåne University Hospital, Lund, Sweden
| | - Thoas Fioretos
- Department of Clinical Genetics, Lund University, Lund, Sweden
| | - Charles Lu
- 1] Department of Genetics, Washington University School of Medicine in St. Louis, St. Louis, Missouri, USA. [2] Genome Institute, Washington University School of Medicine in St. Louis, St. Louis, Missouri, USA
| | - Li Ding
- 1] Department of Genetics, Washington University School of Medicine in St. Louis, St. Louis, Missouri, USA. [2] Genome Institute, Washington University School of Medicine in St. Louis, St. Louis, Missouri, USA
| | - Ching-Hon Pui
- 1] Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA. [2] Department of Oncology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Sheila Shurtleff
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Charles G Mullighan
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Elaine R Mardis
- 1] Department of Genetics, Washington University School of Medicine in St. Louis, St. Louis, Missouri, USA. [2] Genome Institute, Washington University School of Medicine in St. Louis, St. Louis, Missouri, USA
| | - Richard K Wilson
- 1] Department of Genetics, Washington University School of Medicine in St. Louis, St. Louis, Missouri, USA. [2] Genome Institute, Washington University School of Medicine in St. Louis, St. Louis, Missouri, USA
| | - Tanja A Gruber
- 1] Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA. [2] Department of Oncology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Jinghui Zhang
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - James R Downing
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
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Duployez N, Willekens C, Marceau-Renaut A, Boudry-Labis E, Preudhomme C. Prognosis and monitoring of core-binding factor acute myeloid leukemia: current and emerging factors. Expert Rev Hematol 2014; 8:43-56. [PMID: 25348871 DOI: 10.1586/17474086.2014.976551] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Core-binding factor acute myeloid leukemia (CBF-AML) - including AML with t(8;21) and AML with inv(16) - accounts for about 15% of adult AML and is associated with a relatively favorable prognosis. Nonetheless, relapse incidence may reach 40% in these patients. In this context, identification of prognostic markers is considered of great interest. Due to similarities between their molecular and prognostic features, t(8;21) and inv(16)-AML are usually grouped and reported together in clinical studies. However, considerable experimental evidences have highlighted that they represent two distinct entities and should be considered separately for further studies. This review summarizes recent laboratory and clinical findings in this particular subset of AML and how they could be used to improve management of patients in routine practice.
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Affiliation(s)
- Nicolas Duployez
- Hematology Laboratory, Biology and Pathology Center, Lille University Hospital, Lille, France
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34
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Ramdzan ZM, Nepveu A. CUX1, a haploinsufficient tumour suppressor gene overexpressed in advanced cancers. Nat Rev Cancer 2014; 14:673-82. [PMID: 25190083 DOI: 10.1038/nrc3805] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
CUT-like homeobox 1 (CUX1) is a homeobox gene that is implicated in both tumour suppression and progression. The accumulated evidence supports a model of haploinsufficiency whereby reduced CUX1 expression promotes tumour development. Paradoxically, increased CUX1 expression is associated with tumour progression, and ectopic CUX1 expression in transgenic mice increases tumour burden in several tissues. One CUX1 isoform functions as an ancillary factor in base excision repair and the other CUX1 isoforms act as transcriptional activators or repressors. Several transcriptional targets and cellular functions of CUX1 affect tumorigenesis; however, we have yet to develop a mechanistic framework to reconcile the opposite roles of CUX1 in cancer protection and progression.
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Affiliation(s)
- Zubaidah M Ramdzan
- Goodman Cancer Centre, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada
| | - Alain Nepveu
- 1] Goodman Cancer Centre, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada. [2] Department of Biochemistry, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada. [3] Department of Medicine, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada. [4] Department of Oncology, McGill University, 1160 Pine Avenue West, Montreal, Quebec, H3A 1A3, Canada
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35
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Larmonie NSD, Dik WA, Meijerink JPP, Homminga I, van Dongen JJM, Langerak AW. Breakpoint sites disclose the role of the V(D)J recombination machinery in the formation of T-cell receptor (TCR) and non-TCR associated aberrations in T-cell acute lymphoblastic leukemia. Haematologica 2014; 98:1173-84. [PMID: 23904235 DOI: 10.3324/haematol.2012.082156] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Aberrant recombination between T-cell receptor genes and oncogenes gives rise to chromosomal translocations that are genetic hallmarks in several subsets of human T-cell acute lymphoblastic leukemias. The V(D)J recombination machinery has been shown to play a role in the formation of these T-cell receptor translocations. Other, non-T-cell receptor chromosomal aberrations, such as SIL-TAL1 deletions, have likewise been recognized as V(D)J recombination associated aberrations. Despite the postulated role of V(D)J recombination, the extent of the V(D)J recombination machinery involvement in the formation of T-cell receptor and non-T-cell receptor aberrations in T-cell acute lymphoblastic leukemia is still poorly understood. We performed a comprehensive in silico and ex vivo evaluation of 117 breakpoint sites from 22 different T-cell receptor translocation partners as well as 118 breakpoint sites from non-T-cell receptor chromosomal aberrations. Based on this extensive set of breakpoint data, we provide a comprehensive overview of T-cell receptor and oncogene involvement in T-ALL. Moreover, we assessed the role of the V(D)J recombination machinery in the formation of chromosomal aberrations, and propose an up-dated mechanistic classification on how the V(D)J recombination machinery contributes to the formation of T-cell receptor and non-T-cell receptor aberrations in human T-cell acute lymphoblastic leukemia.
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Affiliation(s)
- Nicole S D Larmonie
- Department of Immunology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, the Netherlands
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36
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Bose P, Hermetz KE, Conneely KN, Rudd MK. Tandem repeats and G-rich sequences are enriched at human CNV breakpoints. PLoS One 2014; 9:e101607. [PMID: 24983241 PMCID: PMC4090240 DOI: 10.1371/journal.pone.0101607] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 06/09/2014] [Indexed: 11/18/2022] Open
Abstract
Chromosome breakage in germline and somatic genomes gives rise to copy number variation (CNV) responsible for genomic disorders and tumorigenesis. DNA sequence is known to play an important role in breakage at chromosome fragile sites; however, the sequences susceptible to double-strand breaks (DSBs) underlying CNV formation are largely unknown. Here we analyze 140 germline CNV breakpoints from 116 individuals to identify DNA sequences enriched at breakpoint loci compared to 2800 simulated control regions. We find that, overall, CNV breakpoints are enriched in tandem repeats and sequences predicted to form G-quadruplexes. G-rich repeats are overrepresented at terminal deletion breakpoints, which may be important for the addition of a new telomere. Interstitial deletions and duplication breakpoints are enriched in Alu repeats that in some cases mediate non-allelic homologous recombination (NAHR) between the two sides of the rearrangement. CNV breakpoints are enriched in certain classes of repeats that may play a role in DNA secondary structure, DSB susceptibility and/or DNA replication errors.
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Affiliation(s)
- Promita Bose
- Department of Human Genetics, Emory University School of Medicine, Atlanta, Georgia, United States of America
| | - Karen E. Hermetz
- Department of Human Genetics, Emory University School of Medicine, Atlanta, Georgia, United States of America
| | - Karen N. Conneely
- Department of Human Genetics, Emory University School of Medicine, Atlanta, Georgia, United States of America
- Department of Biostatistics and Bioinformatics, Emory University School of Public Health, Atlanta, Georgia, United States of America
| | - M. Katharine Rudd
- Department of Human Genetics, Emory University School of Medicine, Atlanta, Georgia, United States of America
- * E-mail:
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37
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Duployez N, Nibourel O, Marceau-Renaut A, Willekens C, Helevaut N, Caillault A, Villenet C, Celli-Lebras K, Boissel N, Jourdan E, Dombret H, Figeac M, Preudhomme C, Renneville A. Minimal residual disease monitoring in t(8;21) acute myeloid leukemia based on RUNX1-RUNX1T1 fusion quantification on genomic DNA. Am J Hematol 2014; 89:610-5. [PMID: 24616160 DOI: 10.1002/ajh.23696] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 02/17/2014] [Accepted: 02/24/2014] [Indexed: 11/10/2022]
Abstract
Although acute myeloid leukemia (AML) with t(8;21) belongs to the favorable risk AML subset, relapse incidence may reach 30% in those patients. RUNX1-RUNX1T1 fusion transcript is a well-established marker for minimal residual disease (MRD) monitoring. In this study, we investigated the feasibility and performances of RUNX1-RUNX1T1 DNA as MRD marker in AML with t(8;21). In 17/22 patients with t(8;21)-positive AML treated in the French CBF-2006 trial, breakpoints in RUNX1 and RUNX1T1 were identified using long-range PCR followed by next-generation sequencing. RUNX1-RUNX1T1 DNA quantification was performed by real-time quantitative PCR using patient-specific primers and probe. MRD levels were evaluated in 71 follow-up samples from 16 patients, with a median of four samples [range 2-7] per patient. RUNX1 breakpoints were located in intron 5 in all cases. RUNX1T1 breakpoints were located in intron 1b in 15 cases and in intron 1a in two cases. RUNX1-RUNX1T1 MRD levels measured on DNA and RNA were strongly correlated (r = 0.8, P < 0.0001). Discordant MRD results were observed in 10/71 (14%) of the samples: in three samples from two patients who relapsed, RUNX1-RUNX1T1 was detectable only on DNA, while RUNX1-RUNX1T1 was detectable only on RNA in seven samples. MRD monitoring on genomic DNA is feasible, but with sensitivity variations depending on the patient breakpoint sequence and the qPCR assay efficiency. Although interpretation of the results is easier because it is closely related to the number of leukemic cells, this method greatly increases time, cost and complexity, which limits its interest in routine practice.
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Affiliation(s)
- Nicolas Duployez
- Laboratory of Hematology; Biology and Pathology Center; Lille France
| | - Olivier Nibourel
- Laboratory of Hematology; Biology and Pathology Center; Lille France
- Inserm U-837, Team 3; Cancer Research Institute; Lille France
| | - Alice Marceau-Renaut
- Laboratory of Hematology; Biology and Pathology Center; Lille France
- Inserm U-837, Team 3; Cancer Research Institute; Lille France
| | | | - Nathalie Helevaut
- Laboratory of Hematology; Biology and Pathology Center; Lille France
| | - Aurélie Caillault
- Laboratory of Hematology; Biology and Pathology Center; Lille France
| | | | | | - Nicolas Boissel
- Department of Adult Hematology; St. Louis Hospital; Paris France
| | - Eric Jourdan
- Department of Hematology and Oncology; Nîmes University Hospital; Nîmes France
| | - Hervé Dombret
- Department of Adult Hematology; St. Louis Hospital; Paris France
| | | | - Claude Preudhomme
- Laboratory of Hematology; Biology and Pathology Center; Lille France
- Inserm U-837, Team 3; Cancer Research Institute; Lille France
| | - Aline Renneville
- Laboratory of Hematology; Biology and Pathology Center; Lille France
- Inserm U-837, Team 3; Cancer Research Institute; Lille France
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Tai PWL, Zaidi SK, Wu H, Grandy RA, Montecino MM, van Wijnen AJ, Lian JB, Stein GS, Stein JL. The dynamic architectural and epigenetic nuclear landscape: developing the genomic almanac of biology and disease. J Cell Physiol 2014; 229:711-27. [PMID: 24242872 PMCID: PMC3996806 DOI: 10.1002/jcp.24508] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 11/11/2013] [Indexed: 12/31/2022]
Abstract
Compaction of the eukaryotic genome into the confined space of the cell nucleus must occur faithfully throughout each cell cycle to retain gene expression fidelity. For decades, experimental limitations to study the structural organization of the interphase nucleus restricted our understanding of its contributions towards gene regulation and disease. However, within the past few years, our capability to visualize chromosomes in vivo with sophisticated fluorescence microscopy, and to characterize chromosomal regulatory environments via massively parallel sequencing methodologies have drastically changed how we currently understand epigenetic gene control within the context of three-dimensional nuclear structure. The rapid rate at which information on nuclear structure is unfolding brings challenges to compare and contrast recent observations with historic findings. In this review, we discuss experimental breakthroughs that have influenced how we understand and explore the dynamic structure and function of the nucleus, and how we can incorporate historical perspectives with insights acquired from the ever-evolving advances in molecular biology and pathology.
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Affiliation(s)
- Phillip W. L. Tai
- Department of Biochemistry and Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT
| | - Sayyed K. Zaidi
- Department of Biochemistry and Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT
| | - Hai Wu
- Department of Biochemistry and Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT
| | - Rodrigo A. Grandy
- Department of Biochemistry and Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT
| | - Martin M. Montecino
- Center for Biomedical Research and FONDAP Center for Genome Regulation, Universidad Andres Bello, Santiago, Chile
| | - André J. van Wijnen
- Departments of Orthopedic Surgery and Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN
| | - Jane B. Lian
- Department of Biochemistry and Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT
| | - Gary S. Stein
- Department of Biochemistry and Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT
| | - Janet L. Stein
- Department of Biochemistry and Vermont Cancer Center, University of Vermont College of Medicine, Burlington, VT
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Soni A, Siemann M, Grabos M, Murmann T, Pantelias GE, Iliakis G. Requirement for Parp-1 and DNA ligases 1 or 3 but not of Xrcc1 in chromosomal translocation formation by backup end joining. Nucleic Acids Res 2014; 42:6380-92. [PMID: 24748665 PMCID: PMC4041464 DOI: 10.1093/nar/gku298] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
In mammalian cells, ionizing radiation (IR)-induced DNA double-strand breaks (DSBs) are repaired in all phases of the cell cycle predominantly by classical, DNA-PK-dependent nonhomologous end joining (D-NHEJ). Homologous recombination repair (HRR) is functional during the S- and G2-phases, when a sister chromatid becomes available. An error-prone, alternative form of end joining, operating as backup (B-NHEJ) functions robustly throughout the cell cycle and particularly in the G2-phase and is thought to backup predominantly D-NHEJ. Parp-1, DNA-ligases 1 (Lig1) and 3 (Lig3), and Xrcc1 are implicated in B-NHEJ. Chromosome and chromatid translocations are manifestations of erroneous DSB repair and are crucial culprits in malignant transformation and IR-induced cell lethality. We analyzed shifts in translocation formation deriving from defects in D-NHEJ or HRR in cells irradiated in the G2-phase and identify B-NHEJ as the main DSB repair pathway backing up both of these defects at the cost of a large increase in translocation formation. Our results identify Parp-1 and Lig1 and 3 as factors involved in translocation formation and show that Xrcc1 reinforces the function of Lig3 in the process without being required for it. Finally, we demonstrate intriguing connections between B-NHEJ and DNA end resection in translocation formation and show that, as for D-NHEJ and HRR, the function of B-NHEJ facilitates the recovery from the G2-checkpoint. These observations advance our understanding of chromosome aberration formation and have implications for the mechanism of action of Parp inhibitors.
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Affiliation(s)
- Aashish Soni
- Institute of Medical Radiation Biology, University of Duisburg-Essen Medical School, 45122 Essen, Germany
| | - Maria Siemann
- Institute of Medical Radiation Biology, University of Duisburg-Essen Medical School, 45122 Essen, Germany
| | - Martha Grabos
- Institute of Medical Radiation Biology, University of Duisburg-Essen Medical School, 45122 Essen, Germany
| | - Tamara Murmann
- Institute of Medical Radiation Biology, University of Duisburg-Essen Medical School, 45122 Essen, Germany
| | - Gabriel E Pantelias
- Institute of Nuclear Technology and Radiation Protection, National Centre for Scientific Research ''Demokritos,'' Aghia Paraskevi Attikis, 15310 Athens, Greece
| | - George Iliakis
- Institute of Medical Radiation Biology, University of Duisburg-Essen Medical School, 45122 Essen, Germany
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Lymphohematopoietic cancers induced by chemicals and other agents and their implications for risk evaluation: An overview. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2014; 761:40-64. [PMID: 24731989 DOI: 10.1016/j.mrrev.2014.04.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 04/02/2014] [Accepted: 04/03/2014] [Indexed: 12/13/2022]
Abstract
Lymphohematopoietic neoplasia are one of the most common types of cancer induced by therapeutic and environmental agents. Of the more than 100 human carcinogens identified by the International Agency for Research on Cancer, approximately 25% induce leukemias or lymphomas. The objective of this review is to provide an introduction into the origins and mechanisms underlying lymphohematopoietic cancers induced by xenobiotics in humans with an emphasis on acute myeloid leukemia, and discuss the implications of this information for risk assessment. Among the agents causing lymphohematopoietic cancers, a number of patterns were observed. Most physical and chemical leukemia-inducing agents such as the therapeutic alkylating agents, topoisomerase II inhibitors, and ionizing radiation induce mainly acute myeloid leukemia through DNA-damaging mechanisms that result in either gene or chromosomal mutations. In contrast, biological agents and a few immunosuppressive chemicals induce primarily lymphoid neoplasms through mechanisms that involve alterations in immune response. Among the environmental agents examined, benzene was clearly associated with acute myeloid leukemia in humans, with increasing but still limited evidence for an association with lymphoid neoplasms. Ethylene oxide and 1,3-butadiene were linked primarily to lymphoid cancers. Although the association between formaldehyde and leukemia remains controversial, several recent evaluations have indicated a potential link between formaldehyde and acute myeloid leukemia. The four environmental agents examined in detail were all genotoxic, inducing gene mutations, chromosomal alterations, and/or micronuclei in vivo. Although it is clear that rapid progress has been made in recent years in our understanding of leukemogenesis, many questions remain for future research regarding chemically induced leukemias and lymphomas, including the mechanisms by which the environmental agents reviewed here induce these diseases and the risks associated with exposures to such agents.
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Wright RL, Vaughan ATM. A systematic description of MLL fusion gene formation. Crit Rev Oncol Hematol 2014; 91:283-91. [PMID: 24787275 DOI: 10.1016/j.critrevonc.2014.03.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 02/21/2014] [Accepted: 03/28/2014] [Indexed: 11/25/2022] Open
Abstract
Rearrangements of the MLL gene involve multiple partners and are implicated in both therapy related acute leukemia [tAL] and infant acute leukemia. For these diseases, recently compiled clinical data confirms an elevated frequency of such breakpoints within a 4 kb tract between exon 11 and a region of structural instability adjacent to exon 12. Linked primarily to cases of tAL, interference with topoisomerase II activity may either contribute to the initial DNA lesion directly or indirectly by, for example, providing a physical block to transcription progression. Alternatively, sites of fragmentation may be mis-repaired, guided by intergenic spliced transcripts of the participating genes. Co-transcription of MLL and potential fusion partners may provide the localization that enhances the probability of gene interaction. An indirect role for the leukemogenic activity of topoisomerase II inhibitors would imply that the negative consequences of their use may be separated from their therapeutic effects.
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Affiliation(s)
- Rebecca L Wright
- Department of Radiation Oncology, University of California at Davis, 4501 X Street, Sacramento, CA 95817, United States
| | - Andrew T M Vaughan
- Department of Radiation Oncology, University of California at Davis, 4501 X Street, Sacramento, CA 95817, United States.
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Rebolledo-Jaramillo B, Alarcon RA, Fernandez VI, Gutierrez SE. Cis-regulatory elements are harbored in Intron5 of the RUNX1 gene. BMC Genomics 2014; 15:225. [PMID: 24655352 PMCID: PMC3984029 DOI: 10.1186/1471-2164-15-225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 03/10/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Human RUNX1 gene is one of the most frequent target for chromosomal translocations associated with acute myeloid leukemia (AML) and acute lymphoid leukemia (ALL). The highest prevalence in AML is noted with (8; 21) translocation; which represents 12 to 15% of all AML cases. Interestingly, all the breakpoints mapped to date in t(8;21) are clustered in intron 5 of the RUNX1 gene and intron 1 of the ETO gene. No homologous sequences have been found at the recombination regions; but DNase I hypersensitive sites (DHS) have been mapped to the areas of the genes involved in t(8;21). Presence of DHS sites is commonly associated with regulatory elements such as promoters, enhancers and silencers, among others. RESULTS In this study we used a combination of comparative genomics, cloning and transfection assays to evaluate potential regulatory elements located in intron 5 of the RUNX1 gene. Our genomic analysis identified nine conserved non-coding sequences that are evolutionarily conserved among rat, mouse and human. We cloned two of these regions in pGL-3 Promoter plasmid in order to analyze their transcriptional regulatory activity. Our results demonstrate that the identified regions can indeed regulate transcription of a reporter gene in a distance and position independent manner; moreover, their transcriptional effect is cell type specific. CONCLUSIONS We have identified nine conserved non coding sequence that are harbored in intron 5 of the RUNX1 gene. We have also demonstrated that two of these regions can regulate transcriptional activity in vitro. Taken together our results suggest that intron 5 of the RUNX1 gene contains multiple potential cis-regulatory elements.
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Affiliation(s)
| | | | | | - Soraya E Gutierrez
- Departamento de Bioquimica y Biologia Molecular, Facultad de Ciencias Biologicas, Universidad de Concepcion, Concepcion, Chile.
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Frit P, Barboule N, Yuan Y, Gomez D, Calsou P. Alternative end-joining pathway(s): bricolage at DNA breaks. DNA Repair (Amst) 2014; 17:81-97. [PMID: 24613763 DOI: 10.1016/j.dnarep.2014.02.007] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 02/01/2014] [Accepted: 02/10/2014] [Indexed: 10/25/2022]
Abstract
To cope with DNA double strand break (DSB) genotoxicity, cells have evolved two main repair pathways: homologous recombination which uses homologous DNA sequences as repair templates, and non-homologous Ku-dependent end-joining involving direct sealing of DSB ends by DNA ligase IV (Lig4). During the last two decades a third player most commonly named alternative end-joining (A-EJ) has emerged, which is defined as any Ku- or Lig4-independent end-joining process. A-EJ increasingly appears as a highly error-prone bricolage on DSBs and despite expanding exploration, it still escapes full characterization. In the present review, we discuss the mechanism and regulation of A-EJ as well as its biological relevance under physiological and pathological situations, with a particular emphasis on chromosomal instability and cancer. Whether or not it is a genuine DSB repair pathway, A-EJ is emerging as an important cellular process and understanding A-EJ will certainly be a major challenge for the coming years.
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Affiliation(s)
- Philippe Frit
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), BP 64182, 205 route de Narbonne, 31077 Toulouse, Cedex4, France; Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France; Equipe labellisée Ligue Nationale Contre le Cancer, France
| | - Nadia Barboule
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), BP 64182, 205 route de Narbonne, 31077 Toulouse, Cedex4, France; Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France; Equipe labellisée Ligue Nationale Contre le Cancer, France
| | - Ying Yuan
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), BP 64182, 205 route de Narbonne, 31077 Toulouse, Cedex4, France; Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France; Equipe labellisée Ligue Nationale Contre le Cancer, France
| | - Dennis Gomez
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), BP 64182, 205 route de Narbonne, 31077 Toulouse, Cedex4, France; Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France; Equipe labellisée Ligue Nationale Contre le Cancer, France
| | - Patrick Calsou
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), BP 64182, 205 route de Narbonne, 31077 Toulouse, Cedex4, France; Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France; Equipe labellisée Ligue Nationale Contre le Cancer, France.
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Byrne M, Wray J, Reinert B, Wu Y, Nickoloff J, Lee SH, Hromas R, Williamson E. Mechanisms of oncogenic chromosomal translocations. Ann N Y Acad Sci 2014; 1310:89-97. [PMID: 24528169 DOI: 10.1111/nyas.12370] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Chromosome translocations are caused by inappropriate religation of two DNA double-strand breaks (DSBs) in heterologous chromosomes. These DSBs can be generated by endogenous or exogenous sources. Endogenous sources of DSBs leading to translocations include inappropriate recombination activating gene (RAG) or activation-induced deaminase (AID) activity during immune receptor maturation. Endogenous DSBs can also occur at noncanonical DNA structures or at collapsed replication forks. Exogenous sources of DSBs leading to translocations include ionizing radiation (IR) and cancer chemotherapy. Spatial proximity of the heterologous chromosomes is also important for translocations. While three distinct pathways for DNA DSB repair exist, mounting evidence supports alternative nonhomologous end joining (aNHEJ) as the predominant pathway through which the majority of translocations occur. Initiated by poly (ADP-ribose) polymerase 1 (PARP1), aNHEJ is utilized less frequently in DNA DSB repair than other forms of DSB repair. We recently found that PARP1 is essential for chromosomal translocations to occur and that small molecule PARP1 inhibitors, already in clinical use, can inhibit translocations generated by IR or topoisomerase II inhibition. These data confirm the central role of PARP1 in aNHEJ-mediated chromosomal translocations and raise the possibility of using clinically available PARP1 inhibitors in patients who are at high risk for secondary oncogenic chromosomal translocations.
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Affiliation(s)
- Michael Byrne
- Department of Medicine, University of Florida College of Medicine, Gainesville, Florida
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Zhu X, He F, Zeng H, Ling S, Chen A, Wang Y, Yan X, Wei W, Pang Y, Cheng H, Hua C, Zhang Y, Yang X, Lu X, Cao L, Hao L, Dong L, Zou W, Wu J, Li X, Zheng S, Yan J, Zhou J, Zhang L, Mi S, Wang X, Zhang L, Zou Y, Chen Y, Geng Z, Wang J, Zhou J, Liu X, Wang J, Yuan W, Huang G, Cheng T, Wang QF. Identification of functional cooperative mutations of SETD2 in human acute leukemia. Nat Genet 2014; 46:287-93. [PMID: 24509477 DOI: 10.1038/ng.2894] [Citation(s) in RCA: 189] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2013] [Accepted: 01/15/2014] [Indexed: 12/13/2022]
Abstract
Acute leukemia characterized by chromosomal rearrangements requires additional molecular disruptions to develop into full-blown malignancy, yet the cooperative mechanisms remain elusive. Using whole-genome sequencing of a pair of monozygotic twins discordant for MLL (also called KMT2A) gene-rearranged leukemia, we identified a transforming MLL-NRIP3 fusion gene and biallelic mutations in SETD2 (encoding a histone H3K36 methyltransferase). Moreover, loss-of-function point mutations in SETD2 were recurrent (6.2%) in 241 patients with acute leukemia and were associated with multiple major chromosomal aberrations. We observed a global loss of H3K36 trimethylation (H3K36me3) in leukemic blasts with mutations in SETD2. In the presence of a genetic lesion, downregulation of SETD2 contributed to both initiation and progression during leukemia development by promoting the self-renewal potential of leukemia stem cells. Therefore, our study provides compelling evidence for SETD2 as a new tumor suppressor. Disruption of the SETD2-H3K36me3 pathway is a distinct epigenetic mechanism for leukemia development.
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Affiliation(s)
- Xiaofan Zhu
- 1] State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China. [2]
| | - Fuhong He
- 1] Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China. [2]
| | - Huimin Zeng
- 1] State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China. [2]
| | - Shaoping Ling
- 1] Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China. [2]
| | - Aili Chen
- 1] Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China. [2] Division of Pathology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA. [3] Divisions of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital, Cincinnati, Ohio, USA. [4] University of Chinese Academy of Sciences, Beijing, China. [5]
| | - Yaqin Wang
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Xiaomei Yan
- 1] Division of Pathology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA. [2] Divisions of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital, Cincinnati, Ohio, USA
| | - Wei Wei
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Yakun Pang
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Hui Cheng
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Chunlan Hua
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Yue Zhang
- 1] State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China. [2] Division of Pathology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA. [3] Divisions of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital, Cincinnati, Ohio, USA
| | - Xuejing Yang
- 1] Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China. [2] University of Chinese Academy of Sciences, Beijing, China
| | - Xin Lu
- 1] Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China. [2] University of Chinese Academy of Sciences, Beijing, China
| | - Lihua Cao
- Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Lingtong Hao
- Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Lili Dong
- Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Wei Zou
- Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Jun Wu
- Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Xia Li
- 1] Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China. [2] University of Chinese Academy of Sciences, Beijing, China
| | - Si Zheng
- 1] Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China. [2] University of Chinese Academy of Sciences, Beijing, China
| | - Jin Yan
- Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Jing Zhou
- Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Lixia Zhang
- 1] Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China. [2] University of Chinese Academy of Sciences, Beijing, China
| | - Shuangli Mi
- Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Xiaojuan Wang
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Li Zhang
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Yao Zou
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Yumei Chen
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Zhe Geng
- Department of Hematology, TongJi Hospital, TongJi Medical College, HuaZhong University of Science and Technology, Wuhan, Hubei, China
| | - Jianmin Wang
- Department of Hematology, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Jianfeng Zhou
- Department of Hematology, TongJi Hospital, TongJi Medical College, HuaZhong University of Science and Technology, Wuhan, Hubei, China
| | - Xin Liu
- 1] Mary Ann and J. Milburn Smith Child Health Research Program, Ann and Robert H. Lurie Children's Hospital of Chicago Research Center, Chicago, Illinois, USA. [2] Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Jianxiang Wang
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Weiping Yuan
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Gang Huang
- 1] Division of Pathology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA. [2] Divisions of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital, Cincinnati, Ohio, USA
| | - Tao Cheng
- State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital and Center for Stem Cell Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Qian-Fei Wang
- Laboratory of Genome Variations and Precision Bio-Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
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Genetic and epigenetic determinants mediate proneness of oncogene breakpoint sites for involvement in TCR translocations. Genes Immun 2013; 15:72-81. [PMID: 24304972 DOI: 10.1038/gene.2013.63] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 09/30/2013] [Accepted: 10/22/2013] [Indexed: 01/03/2023]
Abstract
T-cell receptor (TCR) translocations are a genetic hallmark of T-cell acute lymphoblastic leukemia and lead to juxtaposition of oncogene and TCR loci. Oncogene loci become involved in translocations because they are accessible to the V(D)J recombination machinery. Such accessibility is predicted at cryptic recombination signal sequence (cRSS) sites ('Type 1') as well as other sites that are subject to DNA double-strand breaks (DSBs) ('Type 2') during early stages of thymocyte development. As chromatin accessibility markers have not been analyzed in the context of TCR-associated translocations, various genetic and epigenetic determinants of LMO2, TAL1 and TLX1 translocation breakpoint (BP) sites and BP cluster regions (BCRs) were examined in human thymocytes to establish DSB proneness and heterogeneity of BP site involvement in TCR translocations. Our data show that DSBs in BCRs are primarily induced in the presence of a genetic element of sequence vulnerability (cRSSs, transposable elements), whereas breaks at single BP sites lacking such elements are more likely induced by chance or perhaps because of patient-specific genetic vulnerability. Vulnerability to obtain DSBs is increased by features that determine chromatin organization, such as methylation status and nucleosome occupancy, although at different levels at different BP sites.
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Smith KA, Cowell IG, Zhang Y, Sondka Z, Austin CA. The role of topoisomerase II beta on breakage and proximity of RUNX1 to partner alleles RUNX1T1 and EVI1. Genes Chromosomes Cancer 2013; 53:117-28. [PMID: 24327541 DOI: 10.1002/gcc.22124] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Accepted: 10/10/2013] [Indexed: 02/06/2023] Open
Abstract
Rearrangements involving the RUNX1 gene account for approximately 15% of balanced translocations in therapy-related acute myeloid leukemia (t-AML) patients and are one of the most common genetic abnormalities observed in t-AML. Drugs targeting the topoisomerase II (TOP2) enzyme are implicated in t-AML; however, the mechanism is not well understood and to date a single RUNX1-RUNX1T1 t-AML breakpoint junction sequence has been published. Here we report an additional five breakpoint junction sequences from t-AML patients with the RUNX1- RUNX1T1 translocation. Using a leukemia cell line model, we show that TOP2 beta (TOP2B) is required for induction of RUNX1 chromosomal breaks by the TOP2 poison etoposide and that, while TOP2 alpha (TOP2A) and TOP2B proteins are both present on RUNX1 and RUNX1T1 chromatin, only the TOP2B enrichment reached significance following etoposide exposure at a region on RUNX1 where translocations occur. Furthermore, we demonstrate that TOP2B influences the separation between RUNX1 and two translocation partners (RUNX1T1 and EVI) in the nucleus of lymphoid cells. Specifically, we identified a TOP2B-dependent increase in the number of nuclei displaying juxtaposed RUNX1 and RUNX1T1 loci following etoposide treatment.
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Affiliation(s)
- Kayleigh A Smith
- Institute for Cellular and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, UK
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Abstract
The mammalian nucleus is a highly complex structure that carries out a diverse range of functions such as DNA replication, cell division, RNA processing, and nuclear export/import. Many of these activities occur at discrete subcompartments that intersect with specific regions of the genome. Over the past few decades, evidence has accumulated to suggest that RNA transcription also occurs in specialized sites, called transcription factories, that may influence how the genome is organized. There may be certain efficiency benefits to cluster transcriptional activity in this way. However, the clustering of genes at transcription factories may have consequences for genome stability, and increase the susceptibility to recurrent chromosomal translocations that lead to cancer. The relationships between genome organization, transcription, and chromosomal translocation formation will have important implications in understanding the causes of therapy-related cancers.
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Affiliation(s)
- Cameron S Osborne
- Author's Affiliation: Nuclear Dynamics Programme, The Babraham Institute, Cambridge, United Kingdom
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Deriano L, Roth DB. Modernizing the nonhomologous end-joining repertoire: alternative and classical NHEJ share the stage. Annu Rev Genet 2013; 47:433-55. [PMID: 24050180 DOI: 10.1146/annurev-genet-110711-155540] [Citation(s) in RCA: 314] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
DNA double-strand breaks (DSBs) are common lesions that continually threaten genomic integrity. Failure to repair a DSB has deleterious consequences, including cell death. Misrepair is also fraught with danger, especially inappropriate end-joining events, which commonly underlie oncogenic transformation and can scramble the genome. Canonically, cells employ two basic mechanisms to repair DSBs: homologous recombination (HR) and the classical nonhomologous end-joining pathway (cNHEJ). More recent experiments identified a highly error-prone NHEJ pathway, termed alternative NHEJ (aNHEJ), which operates in both cNHEJ-proficient and cNHEJ-deficient cells. aNHEJ is now recognized to catalyze many genome rearrangements, some leading to oncogenic transformation. Here, we review the mechanisms of cNHEJ and aNHEJ, their interconnections with the DNA damage response (DDR), and the mechanisms used to determine which of the three DSB repair pathways is used to heal a particular DSB. We briefly review recent clinical applications involving NHEJ and NHEJ inhibitors.
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Affiliation(s)
- Ludovic Deriano
- Departments of Immunology and Genomes & Genetics, Institut Pasteur, CNRS-URA 1961, 75015 Paris, France;
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Abstract
Chromosomal translocations are common contributors to malignancy, yet little is known about the precise molecular mechanisms by which they are generated. Sequencing translocation junctions in acute leukemias revealed that the translocations were likely mediated by a DNA double-strand break repair pathway termed nonhomologous end-joining (NHEJ). There are major 2 types of NHEJ: (1) the classical pathway initiated by the Ku complex, and (2) the alternative pathway initiated by poly ADP-ribose polymerase 1 (PARP1). Recent reports suggest that classical NHEJ repair components repress translocations, whereas alternative NHEJ components were required for translocations. The rate-limiting step for initiation of alternative NHEJ is the displacement of the Ku complex by PARP1. Therefore, we asked whether PARP1 inhibition could prevent chromosomal translocations in 3 translocation reporter systems. We found that 2 PARP1 inhibitors or repression of PARP1 protein expression strongly repressed chromosomal translocations, implying that PARP1 is essential for this process. Finally, PARP1 inhibition also reduced both ionizing radiation-generated and VP16-generated translocations in 2 cell lines. These data define PARP1 as a critical mediator of chromosomal translocations and raise the possibility that oncogenic translocations occurring after high-dose chemotherapy or radiation could be prevented by treatment with a clinically available PARP1 inhibitor.
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