51
|
Tsuzuki S, Seto M. TEL (ETV6)-AML1 (RUNX1) initiates self-renewing fetal pro-B cells in association with a transcriptional program shared with embryonic stem cells in mice. Stem Cells 2013; 31:236-47. [PMID: 23135987 DOI: 10.1002/stem.1277] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Accepted: 10/09/2012] [Indexed: 11/06/2022]
Abstract
The initial steps involved in the pathogenesis of acute leukemia are poorly understood. The TEL-AML1 fusion gene usually arises before birth, producing a persistent and covert preleukemic clone that may convert to precursor B cell leukemia following the accumulation of secondary genetic "hits." Here, we show that TEL-AML1 can induce persistent self-renewing pro-B cells in mice. TEL-AML1+ cells nevertheless differentiate terminally in the long term, providing a "window" period that may allow secondary genetic hits to accumulate and lead to leukemia. TEL-AML1-mediated self-renewal is associated with a transcriptional program shared with embryonic stem cells (ESCs), within which Mybl2, Tgif2, Pim2, and Hmgb3 are critical and sufficient components to establish self-renewing pro-B cells. We further show that TEL-AML1 increases the number of leukemia-initiating cells that are generated in collaboration with additional genetic hits, thus providing an overall basis for the development of novel therapeutic and preventive measures targeting the TEL-AML1-associated transcriptional program.
Collapse
Affiliation(s)
- Shinobu Tsuzuki
- Division of Molecular Medicine, Aichi Cancer Center Research Institute, Nagoya, Japan.
| | | |
Collapse
|
52
|
Łastowska M, Al-Afghani H, Al-Balool HH, Sheth H, Mercer E, Coxhead JM, Redfern CPF, Peters H, Burt AD, Santibanez-Koref M, Bacon CM, Chesler L, Rust AG, Adams DJ, Williamson D, Clifford SC, Jackson MS. Identification of a neuronal transcription factor network involved in medulloblastoma development. Acta Neuropathol Commun 2013; 1:35. [PMID: 24252690 PMCID: PMC3893591 DOI: 10.1186/2051-5960-1-35] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Accepted: 06/18/2013] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Medulloblastomas, the most frequent malignant brain tumours affecting children, comprise at least 4 distinct clinicogenetic subgroups. Aberrant sonic hedgehog (SHH) signalling is observed in approximately 25% of tumours and defines one subgroup. Although alterations in SHH pathway genes (e.g. PTCH1, SUFU) are observed in many of these tumours, high throughput genomic analyses have identified few other recurring mutations. Here, we have mutagenised the Ptch+/- murine tumour model using the Sleeping Beauty transposon system to identify additional genes and pathways involved in SHH subgroup medulloblastoma development. RESULTS Mutagenesis significantly increased medulloblastoma frequency and identified 17 candidate cancer genes, including orthologs of genes somatically mutated (PTEN, CREBBP) or associated with poor outcome (PTEN, MYT1L) in the human disease. Strikingly, these candidate genes were enriched for transcription factors (p=2x10-5), the majority of which (6/7; Crebbp, Myt1L, Nfia, Nfib, Tead1 and Tgif2) were linked within a single regulatory network enriched for genes associated with a differentiated neuronal phenotype. Furthermore, activity of this network varied significantly between the human subgroups, was associated with metastatic disease, and predicted poor survival specifically within the SHH subgroup of tumours. Igf2, previously implicated in medulloblastoma, was the most differentially expressed gene in murine tumours with network perturbation, and network activity in both mouse and human tumours was characterised by enrichment for multiple gene-sets indicating increased cell proliferation, IGF signalling, MYC target upregulation, and decreased neuronal differentiation. CONCLUSIONS Collectively, our data support a model of medulloblastoma development in SB-mutagenised Ptch+/- mice which involves disruption of a novel transcription factor network leading to Igf2 upregulation, proliferation of GNPs, and tumour formation. Moreover, our results identify rational therapeutic targets for SHH subgroup tumours, alongside prognostic biomarkers for the identification of poor-risk SHH patients.
Collapse
Affiliation(s)
- Maria Łastowska
- Institute of Genetic Medicine, Newcastle University, Central Parkway,
Newcastle upon Tyne NE1 3BZ, UK
- Department of Pathology, Children’s Memorial Health Institute, Av.
Dzieci Polskich 20, 04-730, Warsaw, Poland
| | - Hani Al-Afghani
- Institute of Genetic Medicine, Newcastle University, Central Parkway,
Newcastle upon Tyne NE1 3BZ, UK
| | - Haya H Al-Balool
- Institute of Genetic Medicine, Newcastle University, Central Parkway,
Newcastle upon Tyne NE1 3BZ, UK
| | - Harsh Sheth
- Institute of Genetic Medicine, Newcastle University, Central Parkway,
Newcastle upon Tyne NE1 3BZ, UK
| | - Emma Mercer
- Institute of Genetic Medicine, Newcastle University, Central Parkway,
Newcastle upon Tyne NE1 3BZ, UK
- Centre for Molecular Oncology, Barts Cancer Institute, Barts and The London
School of Medicine and Dentistry, Queen Mary University of London,
Charterhouse Square, London EC1M 6BQ, UK
| | - Jonathan M Coxhead
- NewGene Limited, Bioscience Building, International Centre for Life,
Newcastle upon Tyne NE1 4EP, UK
| | - Chris PF Redfern
- Northern Institute for Cancer Research, Newcastle University, Newcastle upon
Tyne NE1 4LP, UK
| | - Heiko Peters
- Institute of Genetic Medicine, Newcastle University, Central Parkway,
Newcastle upon Tyne NE1 3BZ, UK
| | - Alastair D Burt
- Faculty of Medical Sciences, William Leech Building, Newcastle University,
Newcastle upon Tyne NE2 4HH, UK
- School of Medicine, Faculty of Health Sciences, University of Adelaide,
Adelaide, South Australia SA 5045, Australia
| | - Mauro Santibanez-Koref
- Institute of Genetic Medicine, Newcastle University, Central Parkway,
Newcastle upon Tyne NE1 3BZ, UK
| | - Chris M Bacon
- Northern Institute for Cancer Research, Newcastle University, Newcastle upon
Tyne NE1 4LP, UK
| | - Louis Chesler
- Division of Clinical Studies and Cancer Therapeutics, The Institute of Cancer
Research & The Royal Marsden NHS Trust, Sutton, Surrey, SM2 5NG, UK
| | - Alistair G Rust
- Experimental Cancer Genetics, Wellcome Trust Sanger Institute, Hinxton CB10
1HH, UK
| | - David J Adams
- Experimental Cancer Genetics, Wellcome Trust Sanger Institute, Hinxton CB10
1HH, UK
| | - Daniel Williamson
- Northern Institute for Cancer Research, Newcastle University, Newcastle upon
Tyne NE1 4LP, UK
| | - Steven C Clifford
- Northern Institute for Cancer Research, Newcastle University, Newcastle upon
Tyne NE1 4LP, UK
| | - Michael S Jackson
- Institute of Genetic Medicine, Newcastle University, Central Parkway,
Newcastle upon Tyne NE1 3BZ, UK
| |
Collapse
|
53
|
Developmental timing of mutations revealed by whole-genome sequencing of twins with acute lymphoblastic leukemia. Proc Natl Acad Sci U S A 2013; 110:7429-33. [PMID: 23569245 DOI: 10.1073/pnas.1221099110] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Acute lymphoblastic leukemia (ALL) is the major pediatric cancer. At diagnosis, the developmental timing of mutations contributing critically to clonal diversification and selection can be buried in the leukemia's covert natural history. Concordance of ALL in monozygotic, monochorionic twins is a consequence of intraplacental spread of an initiated preleukemic clone. Studying monozygotic twins with ALL provides a unique means of uncovering the timeline of mutations contributing to clonal evolution, pre- and postnatally. We sequenced the whole genomes of leukemic cells from two twin pairs with ALL to comprehensively characterize acquired somatic mutations in ALL, elucidating the developmental timing of all genetic lesions. Shared, prenatal, coding-region single-nucleotide variants were limited to the putative initiating lesions. All other nonsynonymous single-nucleotide variants were distinct between tumors and, therefore, secondary and postnatal. These changes occurred in a background of noncoding mutational changes that were almost entirely discordant in twin pairs and likely passenger mutations acquired during leukemic cell proliferation.
Collapse
|
54
|
Rogers LM, Olivier AK, Meyerholz DK, Dupuy AJ. Adaptive immunity does not strongly suppress spontaneous tumors in a Sleeping Beauty model of cancer. THE JOURNAL OF IMMUNOLOGY 2013; 190:4393-9. [PMID: 23475219 DOI: 10.4049/jimmunol.1203227] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The tumor immunosurveillance hypothesis describes a process by which the immune system recognizes and suppresses the growth of transformed cancer cells. A variety of epidemiological and experimental evidence supports this hypothesis. Nevertheless, there are a number of conflicting reports regarding the degree of immune protection conferred, the immune cell types responsible for protection, and the potential contributions of immunosuppressive therapies to tumor induction. The purpose of this study was to determine whether the adaptive immune system actively suppresses tumorigenesis in a Sleeping Beauty (SB) mouse model of cancer. SB transposon mutagenesis was performed in either a wild-type or immunocompromised (Rag2-null) background. Tumor latency and multiplicity were remarkably similar in both immune cohorts, suggesting that the adaptive immune system is not efficiently suppressing tumor formation in our model. Exceptions included skin tumors, which displayed increased multiplicity in wild-type animals, and leukemias, which developed with shorter latency in immune-deficient mice. Overall tumor distribution was also altered such that tumors affecting the gastrointestinal tract were more frequent and hemangiosarcomas were less frequent in immune-deficient mice compared with wild-type mice. Finally, genetic profiling of transposon-induced mutations identified significant differences in mutation prevalence for a number of genes, including Uba1. Taken together, these results indicate that B and T cells function to shape the genetic profile of tumors in various tumor types, despite being ineffective at clearing SB-induced tumors. To our knowledge, this study represents the first forward genetic screen designed to examine tumor immunosurveillance mechanisms.
Collapse
Affiliation(s)
- Laura M Rogers
- Department of Anatomy and Cell Biology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | | | | | | |
Collapse
|
56
|
Zakaria Z, Ahid MFM, Ismail A, Keoh TS, Nor NM, Kamaluddin NR, Esa E, Yuen LK, Rahman EJA, Osman R. Chromosomal Aberrations in ETV6/RUNX1-positive Childhood Acute Lymphoblastic Leukemia using 244K Oligonucleotide Array Comparative Genomic Hybridization. Mol Cytogenet 2012; 5:41. [PMID: 23151340 PMCID: PMC3549777 DOI: 10.1186/1755-8166-5-41] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Accepted: 09/20/2012] [Indexed: 11/28/2022] Open
Abstract
Background Acute lymphoblastic leukemia (ALL) is a heterogeneous form of hematological cancer consisting of various subtypes. We are interested to study the genetic aberration in precursor B-cell ALL with specific t(12;21) translocation in childhood ALL patients. A high resolution 244K array-based Comparative Genomic Hybridization (array-CGH) was used to study eleven ETV6/RUNX1-positive childhood acute lymphoblastic leukemia (ALL) patients. Result 155 chromosomal aberrations (119 losses, 36 gains) were reported in the array findings, corresponding to 76.8% deletions and 23.2% amplifications. The ETV6 gene deletion occurred in 4 of the patients, corresponding to 45% of the sample. The most common alterations above 1 Mb were deletion 6q (13%), 12p (12%) and 9p (8%), and duplication 4q (6%) and Xq (4%). Other genes important in ALL were also identified in this study including RUNX1, CDKN2A, FHIT, and PAX5. The array-CGH technique was able to detect microdeletion as small as 400 bp. Conclusion The results demonstrate the usefulness of high resolution array-CGH as a complementary tool in the investigation of ALL.
Collapse
Affiliation(s)
- Zubaidah Zakaria
- Hematology Unit, Cancer Research Center, Institute for Medical Research, Kuala Lumpur, 50588, Malaysia.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
58
|
McIntyre RE, van der Weyden L, Adams DJ. Cancer gene discovery in the mouse. Curr Opin Genet Dev 2012; 22:14-20. [PMID: 22265936 DOI: 10.1016/j.gde.2011.12.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Revised: 12/16/2011] [Accepted: 12/20/2011] [Indexed: 01/09/2023]
Abstract
Developments in high-throughput genome analysis and in computational tools have made it possible to rapidly profile entire cancer genomes with basepair resolution. In parallel with these advances, mouse models of cancer have evolved into powerful tools for cancer gene discovery. Here we discuss some of the approaches that may be used for cancer gene identification in the mouse and discuss how a cross-species 'oncogenomics' approach to cancer gene discovery represents a powerful strategy for finding genes that drive tumorigenesis.
Collapse
Affiliation(s)
- Rebecca E McIntyre
- Experimental Cancer Genetics, The Wellcome Trust Sanger Institute, Hinxton, Cambs CB10 1HH, UK
| | | | | |
Collapse
|
59
|
Howell VM. Sleeping beauty--a mouse model for all cancers? Cancer Lett 2011; 317:1-8. [PMID: 22079740 DOI: 10.1016/j.canlet.2011.11.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 11/03/2011] [Accepted: 11/04/2011] [Indexed: 12/22/2022]
Abstract
Sleeping Beauty (SB) is a genetically engineered insertional mutagenesis system. Its ability to rapidly induce cancer in SB-transgenic mice as well as the ease of identification of the mutated genes suggest important roles for SB in the discovery of novel cancer genes as well as the generation of models of human cancers where none currently exist. The range of SB-related tumors extends from haematopoietic to solid cancers such as hepatocellular carcinoma. This review follows the refinement of SB for different cancers and assesses its potential as a model for all cancers and a tool for cancer gene discovery.
Collapse
Affiliation(s)
- Viive M Howell
- Functional Genomics Laboratory, Kolling Institute of Medical Research, University of Sydney, E25, Level 9, Kolling Building, Royal North Shore Hospital, St. Leonards, NSW 2065, Australia.
| |
Collapse
|