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Zhang H, Cui K, Yao S, Yin Y, Liu D, Huang Z. Comprehensive molecular and clinical characterization of SLC1A5 in human cancers. Pathol Res Pract 2021; 224:153525. [PMID: 34171602 DOI: 10.1016/j.prp.2021.153525] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 06/07/2021] [Accepted: 06/08/2021] [Indexed: 12/20/2022]
Abstract
Although SLC1A5 has been reported to be closely associated with some cancer types, a comprehensive and systematic assessment of SLC1A5 across human cancers is lacking. Thus, Pan-cancer analysis of SLC1A5 was performed across 30 types of human cancers in this study. We examined mRNA expression, protein expression, copy number variation (CNV), DNA methylation, clinical relevance, cell functions, drug response and total immune infiltrates of SLC1A5 in more than 9000 patients across 30 human cancer types from The Cancer Genome Atlas (TCGA) dataset. Additionally, nine independent Gene Expression Omnibus datasets, more than 800 cancer cell lines from the Cancer Cell Line Encyclopedia dataset and the Project Achilles dataset were used to validate our findings in the TCGA dataset. Landscapes of SLC1A5 were established across multiple cancers. We showed that SLC1A5 is upregulated in multiple cancers, particularly in digestive and respiratory system cancers. SLC1A5 upregulation may be driven by CNV gain and DNA hypomethylation in human cancers. Furthermore, SLC1A5 overexpression is associated with tumor progression and poor survival in multiple cancers. Moreover, we systematically explored the potential effects of SLC1A5 expression on cell functions and drug response in human cancers. SLC1A5 knockdown showed significant proliferation-inhibiting effects in most human cancer types, especially in the digestive system and KRAS-mutant cancers. SLC1A5 expression is associated with proliferation activities of KRAS-mutant cancer cell lines and drug response of many anti-cancer drugs. Finally, we demonstrated that SLC1A5-realted tumor immune microenvironment characteristics showed strong heterogeneity in human cancers. Taken together, our findings highlight the important roles of SLC1A5 in tumorigenesis, progression, prognosis and therapy.
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Affiliation(s)
- Han Zhang
- Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi 214062, Jiangsu, China; Laboratory of Cancer Epigenetics, Wuxi School of Medicine, Jiangnan University, Wuxi 214122, Jiangsu, China.
| | - Kaisa Cui
- Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi 214062, Jiangsu, China; Laboratory of Cancer Epigenetics, Wuxi School of Medicine, Jiangnan University, Wuxi 214122, Jiangsu, China.
| | - Surui Yao
- Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi 214062, Jiangsu, China; Laboratory of Cancer Epigenetics, Wuxi School of Medicine, Jiangnan University, Wuxi 214122, Jiangsu, China.
| | - Yuan Yin
- Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi 214062, Jiangsu, China; Laboratory of Cancer Epigenetics, Wuxi School of Medicine, Jiangnan University, Wuxi 214122, Jiangsu, China.
| | - Dengyang Liu
- Department of Digestive Center, Affiliated Hospital of Jiangnan University, Wuxi 214062, Jiangsu, China.
| | - Zhaohui Huang
- Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi 214062, Jiangsu, China; Laboratory of Cancer Epigenetics, Wuxi School of Medicine, Jiangnan University, Wuxi 214122, Jiangsu, China.
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2
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Panagopoulos I, Andersen K, Eilert-Olsen M, Zeller B, Munthe-Kaas MC, Buechner J, Osnes LTN, Micci F, Heim S. Therapy-induced Deletion in 11q23 Leading to Fusion of KMT2A With ARHGEF12 and Development of B Lineage Acute Lymphoplastic Leukemia in a Child Treated for Acute Myeloid Leukemia Caused by t(9;11)(p21;q23)/ KMT2A-MLLT3. Cancer Genomics Proteomics 2021; 18:67-81. [PMID: 33419897 DOI: 10.21873/cgp.20242] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 10/25/2020] [Accepted: 10/27/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND/AIM Fusion of histone-lysine N-methyltransferase 2A gene (KMT2A) with the Rho guanine nucleotide exchange factor 12 gene (ARHGEF12), both located in 11q23, was reported in some leukemic patients. We report a KMT2A-ARHGEF12 fusion occurring during treatment of a pediatric acute myeloid leukemia (AML) with topoisomerase II inhibitors leading to a secondary acute lymphoblastic leukemia (ALL). MATERIALS AND METHODS Multiple genetic analyses were performed on bone marrow cells of a girl initially diagnosed with AML. RESULTS At the time of diagnosis with AML, the t(9;11)(p21;q23)/KMT2A-MLLT3 genetic abnormality was found. After chemotherapy resulting in AML clinical remission, a 2 Mb deletion in 11q23 was found generating a KMT2A-ARHGEF12 fusion gene. When the patient later developed B lineage ALL, a t(14;19)(q32;q13), loss of one chromosome 9, and KMT2A-ARHGEF12 were detected. CONCLUSION The patient sequentially developed AML and ALL with three leukemia-specific genomic abnormalities in her bone marrow cells, two of which were KMT2A-rearrangements.
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Affiliation(s)
- Ioannis Panagopoulos
- Section for Cancer Cytogenetics, Institute for Cancer Genetics and Informatics, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway;
| | - Kristin Andersen
- Section for Cancer Cytogenetics, Institute for Cancer Genetics and Informatics, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
| | - Martine Eilert-Olsen
- Section for Cancer Cytogenetics, Institute for Cancer Genetics and Informatics, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
| | - Bernward Zeller
- Department of Pediatric Hematology and Oncology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Monica Cheng Munthe-Kaas
- Department of Pediatric Hematology and Oncology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Jochen Buechner
- Department of Pediatric Hematology and Oncology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Liv T N Osnes
- Department of Immunology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Francesca Micci
- Section for Cancer Cytogenetics, Institute for Cancer Genetics and Informatics, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
| | - Sverre Heim
- Section for Cancer Cytogenetics, Institute for Cancer Genetics and Informatics, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
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3
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Myoepithelioma-like Hyalinizing Epithelioid Tumors of the Hand With Novel OGT-FOXO3 Fusions. Am J Surg Pathol 2020; 44:387-395. [PMID: 31567281 DOI: 10.1097/pas.0000000000001380] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Myoepithelial tumors of soft tissue are uncommon neoplasms characterized histologically by spindle to epithelioid cells arranged in cords, nests, and/or reticular pattern with chondromyxoid to hyaline stroma, and genetically by rearrangement involving EWSR1 (among other less common genes) in about half of the cases. The diagnosis often requires immunostaining to confirm myoepithelial differentiation, most importantly the expression of epithelial markers and S100 protein and/or GFAP. However, there are cases wherein the morphology is reminiscent of myoepithelial tumors, while the immunophenotype falls short. Here, we report 2 highly similar myoepithelioma-like tumors arising in the hands of young adults. Both tumors were well-demarcated and composed of alternating cellular areas with palely eosinophilic hyaline stroma and scattered acellular zones of densely eosinophilic collagen deposition. The tumor cells were mainly epithelioid cells and arranged in cords or small nests. Vacuolated cells encircling hyaline matrix globules were focally prominent. A minor component of nonhyaline fibrous nodular areas composed of bland spindle cells and rich vasculature was also observed. Perivascular concentric spindle cell proliferation and perivascular hyalinization were present in some areas. The tumor cells were positive for CD34 and epithelial membrane antigen (focal) by immunostaining, while largely negative for cytokeratin, S100, GFAP, p63, GLUT1, and claudin-1. By RNA sequencing, a novel OGT-FOXO3 fusion gene was identified in case 1 and confirmed by reverse transcription polymerase chain reaction and fluorescence in situ hybridization in both cases. Sharing the unusual clinicopathologic features and the novel fusion, these 2 cases probably represent a distinct tumor entity, whose relationship with myoepithelial tumors and tumorigenic mechanisms exerted by the OGT-FOXO3 fusion remain to be studied.
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4
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Corces MR, Chang HY, Majeti R. Preleukemic Hematopoietic Stem Cells in Human Acute Myeloid Leukemia. Front Oncol 2017; 7:263. [PMID: 29164062 PMCID: PMC5681525 DOI: 10.3389/fonc.2017.00263] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 10/19/2017] [Indexed: 12/16/2022] Open
Abstract
Acute myeloid leukemia (AML) is an aggressive malignancy of the bone marrow characterized by an uncontrolled proliferation of undifferentiated myeloid lineage cells. Decades of research have demonstrated that AML evolves from the sequential acquisition of genetic alterations within a single lineage of hematopoietic cells. More recently, the advent of high-throughput sequencing has enabled the identification of a premalignant phase of AML termed preleukemia. Multiple studies have demonstrated that AML can arise from the accumulation of mutations within hematopoietic stem cells (HSCs). These HSCs have been termed "preleukemic HSCs" as they represent the evolutionary ancestors of the leukemia. Through examination of the biological and clinical characteristics of these preleukemic HSCs, this review aims to shed light on some of the unexplored questions in the field. We note that some of the material discussed is speculative in nature and is presented in order to motivate future work.
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Affiliation(s)
- M. Ryan Corces
- Center for Personal Dynamic Regulomes, Stanford University School of Medicine, Stanford, CA, United States
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, United States
| | - Howard Y. Chang
- Center for Personal Dynamic Regulomes, Stanford University School of Medicine, Stanford, CA, United States
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, CA, United States
| | - Ravindra Majeti
- Program in Cancer Biology, Cancer Institute, Institute for Stem Cell Biology and Regenerative Medicine, Ludwig Center, Stanford University School of Medicine, Stanford, CA, United States
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5
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Reemergence of translocation t(11;19)(q23;p13.1) in the absence of clinically overt leukemia. Int J Hematol 2017; 106:847-851. [PMID: 28669059 DOI: 10.1007/s12185-017-2289-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 06/26/2017] [Accepted: 06/28/2017] [Indexed: 10/19/2022]
Abstract
We report the case of a 10-year-old female with acute myeloid leukemia (AML) FAB M0 carrying a novel t(11;19)(q23;p13.1) MLL-ELL variant, in which intron 8 of MLL is fused to exon 6 of ELL. Complete remission, judged by morphology and cytogenetic analysis, was achieved after the conventional chemotherapy. Eight months after completion of therapy, the level of WT-1 in peripheral blood and the number of cells with the MLL-ELL fusion transcript resurged. However, the patient remained overtly healthy and the morphology in the bone-marrow smear was innocuous, with no sign of relapse or secondary leukemia. Without any evidence of relapse, the patient has been closely observed without any therapeutic intervention. For approximately 2 years after the completion of therapy, despite clonal proliferation of pre-leukemic cells with an MLL-ELL fusion gene, she has maintained complete remission. In this case, the rare variant form of MLL-ELL fusion that has been identified may be related to diminished leukemogenic capacity, resulting in the persistence of pre-leukemic status; an additional genetic abnormality may thus be necessary for full transformation of pre-leukemic cells.
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6
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Monitoring of childhood ALL using BCR-ABL1 genomic breakpoints identifies a subgroup with CML-like biology. Blood 2017; 129:2771-2781. [PMID: 28331056 DOI: 10.1182/blood-2016-11-749978] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 03/17/2017] [Indexed: 12/20/2022] Open
Abstract
We used the genomic breakpoint between BCR and ABL1 genes for the DNA-based monitoring of minimal residual disease (MRD) in 48 patients with childhood acute lymphoblastic leukemia (ALL). Comparing the results with standard MRD monitoring based on immunoglobulin/T-cell receptor (Ig/TCR) gene rearrangements and with quantification of IKZF1 deletion, we observed very good correlation for the methods in a majority of patients; however, >20% of children (25% [8/32] with minor and 12.5% [1/8] with major-BCR-ABL1 variants in the consecutive cohorts) had significantly (>1 log) higher levels of BCR-ABL1 fusion than Ig/TCR rearrangements and/or IKZF1 deletion. We performed cell sorting of the diagnostic material and assessed the frequency of BCR-ABL1-positive cells in various hematopoietic subpopulations; 12% to 83% of non-ALL B lymphocytes, T cells, and/or myeloid cells harbored the BCR-ABL1 fusion in patients with discrepant MRD results. The multilineage involvement of the BCR-ABL1-positive clone demonstrates that in some patients diagnosed with BCR-ABL1-positive ALL, a multipotent hematopoietic progenitor is affected by the BCR-ABL1 fusion. These patients have BCR-ABL1-positive clonal hematopoiesis resembling a chronic myeloid leukemia (CML)-like disease manifesting in "lymphoid blast crisis." The biological heterogeneity of BCR-ABL1-positive ALL may impact the patient outcomes and optimal treatment (early stem cell transplantation vs long-term administration of tyrosine-kinase inhibitors) as well as on MRD testing. Therefore, we recommend further investigations on CML-like BCR-ABL1-positive ALL.
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7
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Zimmermannova O, Zaliova M, Moorman AV, Al-Shehhi H, Fronkova E, Zemanova Z, Kalina T, Vora A, Stary J, Trka J, Hrusak O, Zuna J. Acute lymphoblastic leukemia with aleukemic prodrome: preleukemic dynamics and possible mechanisms of immunosurveillance. Haematologica 2017; 102:e225-e228. [PMID: 28255018 DOI: 10.3324/haematol.2016.161380] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Olga Zimmermannova
- CLIP, Childhood Leukaemia Investigation Prague, Czech Republic.,Department of Paediatric Haematology and Oncology, 2 Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Marketa Zaliova
- CLIP, Childhood Leukaemia Investigation Prague, Czech Republic.,Department of Paediatric Haematology and Oncology, 2 Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Anthony V Moorman
- Leukaemia Research Cytogenetics Group, Northern Institute for Cancer Research, Newcastle University, Newcastle upon Tyne, UK
| | - Halima Al-Shehhi
- Leukaemia Research Cytogenetics Group, Northern Institute for Cancer Research, Newcastle University, Newcastle upon Tyne, UK
| | - Eva Fronkova
- CLIP, Childhood Leukaemia Investigation Prague, Czech Republic.,Department of Paediatric Haematology and Oncology, 2 Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Zuzana Zemanova
- Center of Oncocytogenetics, Institute of Clinical Biochemistry and Laboratory Diagnostics, 1 Faculty of Medicine, Charles University and General University Hospital, Prague, Czech Republic
| | - Tomas Kalina
- CLIP, Childhood Leukaemia Investigation Prague, Czech Republic.,Department of Paediatric Haematology and Oncology, 2 Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Ajay Vora
- Department of Haematology, Sheffield Children's Hospital, UK
| | - Jan Stary
- Department of Paediatric Haematology and Oncology, 2 Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Jan Trka
- CLIP, Childhood Leukaemia Investigation Prague, Czech Republic.,Department of Paediatric Haematology and Oncology, 2 Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Ondrej Hrusak
- CLIP, Childhood Leukaemia Investigation Prague, Czech Republic.,Department of Paediatric Haematology and Oncology, 2 Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Jan Zuna
- CLIP, Childhood Leukaemia Investigation Prague, Czech Republic .,Department of Paediatric Haematology and Oncology, 2 Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
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8
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Bonizzato A, Gaffo E, te Kronnie G, Bortoluzzi S. CircRNAs in hematopoiesis and hematological malignancies. Blood Cancer J 2016; 6:e483. [PMID: 27740630 PMCID: PMC5098259 DOI: 10.1038/bcj.2016.81] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 08/11/2016] [Indexed: 12/12/2022] Open
Abstract
Cell states in hematopoiesis are controlled by master regulators and by complex circuits of a growing family of RNA species impacting cell phenotype maintenance and plasticity. Circular RNAs (circRNAs) are rapidly gaining the status of particularly stable transcriptome members with distinctive qualities. RNA-seq identified thousands of circRNAs with developmental stage- and tissue-specific expression corroborating earlier suggestions that circular isoforms are a natural feature of the cell expression program. CircRNAs are abundantly expressed also in the hematopoietic compartment. There are a number of studies on circRNAs in blood cells, a specific overview is however lacking. In this review we first present current insight in circRNA biogenesis discussing the relevance for hematopoiesis of the highly interleaved processes of splicing and circRNA biogenesis. Regarding molecular functions circRNAs modulate host gene expression, but also compete for binding of microRNAs, RNA-binding proteins or translation initiation and participate in regulatory circuits. We examine circRNA expression in the hematopoietic compartment and in hematologic malignancies and review the recent breakthrough study that identified pathogenic circRNAs derived from leukemia fusion genes. CircRNA high and regulated expression in blood cell types indicate that further studies are warranted to inform the position of these regulators in normal and malignant hematopoiesis.
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Affiliation(s)
- A Bonizzato
- Department of Women's and Children's Health, University of Padova, Padova, Italy
| | - E Gaffo
- Department of Molecular Medicine, University of Padova, Padova, Italy
| | - G te Kronnie
- Department of Women's and Children's Health, University of Padova, Padova, Italy
| | - S Bortoluzzi
- Department of Molecular Medicine, University of Padova, Padova, Italy
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9
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Salci KR, Lee JH, Laronde S, Dingwall S, Kushwah R, Fiebig-Comyn A, Leber B, Foley R, Dal Cin A, Bhatia M. Cellular Reprogramming Allows Generation of Autologous Hematopoietic Progenitors From AML Patients That Are Devoid of Patient-Specific Genomic Aberrations. Stem Cells 2016; 33:1839-49. [PMID: 25764124 PMCID: PMC4691325 DOI: 10.1002/stem.1994] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 02/03/2015] [Accepted: 02/13/2015] [Indexed: 12/12/2022]
Abstract
Current treatments that use hematopoietic progenitor cell (HPC) transplantation in acute myeloid leukemia (AML) patients substantially reduce the risk of relapse, but are limited by the availability of immune compatible healthy HPCs. Although cellular reprogramming has the potential to provide a novel autologous source of HPCs for transplantation, the applicability of this technology toward the derivation of healthy autologous hematopoietic cells devoid of patient-specific leukemic aberrations from AML patients must first be evaluated. Here, we report the generation of human AML patient-specific hematopoietic progenitors that are capable of normal in vitro differentiation to myeloid lineages and are devoid of leukemia-associated aberration found in matched patient bone marrow. Skin fibroblasts were obtained from AML patients whose leukemic cells possessed a distinct, leukemia-associated aberration, and used to create AML patient-specific induced pluripotent stem cells (iPSCs). Through hematopoietic differentiation of AML patient iPSCs, coupled with cytogenetic interrogation, we reveal that AML patient-specific HPCs possess normal progenitor capacity and are devoid of leukemia-associated mutations. Importantly, in rare patient skin samples that give rise to mosaic fibroblast cultures that continue to carry leukemia-associated mutations; healthy hematopoietic progenitors can also be generated via reprogramming selection. Our findings provide the proof of principle that cellular reprogramming can be applied on a personalized basis to generate healthy HPCs from AML patients, and should further motivate advances toward creating transplantable hematopoietic stem cells for autologous AML therapy. Stem Cells2013;33:1839–1849
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Affiliation(s)
- Kyle R Salci
- McMaster Stem Cell and Cancer Research Institute, Michael G. DeGroote School of Medicine, Faculty of Health Sciences.,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Jong-Hee Lee
- McMaster Stem Cell and Cancer Research Institute, Michael G. DeGroote School of Medicine, Faculty of Health Sciences
| | - Sarah Laronde
- McMaster Stem Cell and Cancer Research Institute, Michael G. DeGroote School of Medicine, Faculty of Health Sciences
| | - Steve Dingwall
- McMaster Stem Cell and Cancer Research Institute, Michael G. DeGroote School of Medicine, Faculty of Health Sciences.,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Rahul Kushwah
- McMaster Stem Cell and Cancer Research Institute, Michael G. DeGroote School of Medicine, Faculty of Health Sciences
| | - Aline Fiebig-Comyn
- McMaster Stem Cell and Cancer Research Institute, Michael G. DeGroote School of Medicine, Faculty of Health Sciences
| | - Brian Leber
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Ronan Foley
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Arianna Dal Cin
- Department of Surgery, Hamilton Health Sciences, Hamilton, Ontario, Canada.,Department of Oncology, Hamilton Health Sciences, Hamilton, Ontario, Canada
| | - Mickie Bhatia
- McMaster Stem Cell and Cancer Research Institute, Michael G. DeGroote School of Medicine, Faculty of Health Sciences.,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
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10
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Long-term remission of therapy-related acute myeloid leukemia with a new t(11;18)(q23;q21.2) translocation and KMT2A-ME2 (MLL-ME2) fusion gene. Cancer Genet 2015; 208:610-4. [PMID: 26556690 DOI: 10.1016/j.cancergen.2015.09.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 09/04/2015] [Accepted: 09/05/2015] [Indexed: 11/21/2022]
Abstract
We describe a unique case of a woman with acute myeloid leukemia with a new, previously undescribed translocation, t(11;18)(q23;q21.2), affecting the KMT2A (MLL) gene and resulting in an KMT2A(MLL)-ME2 fusion. This disease occurred secondarily following chemotherapy for a different acute myeloid leukemia with the recurrent genetic abnormality inv(16)(p13.1;q22). The secondary leukemia was treated with intensive chemotherapy without allogeneic hematopoietic cell transplantation. Complete remission lasting more than 10 years has been achieved with concurrent and sustained remission of the primary leukemia.
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11
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Corces-Zimmerman MR, Majeti R. Pre-leukemic evolution of hematopoietic stem cells: the importance of early mutations in leukemogenesis. Leukemia 2014; 28:2276-82. [PMID: 25005245 PMCID: PMC4262622 DOI: 10.1038/leu.2014.211] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Accepted: 05/23/2014] [Indexed: 12/17/2022]
Abstract
Cancer has been shown to result from the sequential acquisition of genetic alterations in a single lineage of cells. In leukemia, increasing evidence has supported the idea that this accumulation of mutations occurs in self-renewing hematopoietic stem cells (HSCs). These HSCs containing some, but not all, leukemia-specific mutations have been termed as pre-leukemic. Multiple recent studies have sought to understand these pre-leukemic HSCs and determine to what extent they contribute to leukemogenesis. These studies have elucidated patterns in mutation acquisition in leukemia, demonstrated resistance of pre-leukemic cells to standard induction chemotherapy and identified these pre-leukemic cells as a putative reservoir for the generation of relapsed disease. When combined with decades of research on clonal evolution in leukemia, mouse models of leukemogenesis, and recent massively parallel sequencing-based studies of primary patient leukemia, studies of pre-leukemic HSCs begin to piece together the evolutionary puzzle of leukemogenesis. These results have broad implications for leukemia treatment, targeted therapies, minimal residual disease monitoring and early detection screening.
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Affiliation(s)
- M. Ryan Corces-Zimmerman
- Program in Cancer Biology, Cancer Institute, Institute for Stem Cell Biology and Regenerative Medicine, and Ludwig Center, Stanford, CA 94305, USA
| | - Ravindra Majeti
- Program in Cancer Biology, Cancer Institute, Institute for Stem Cell Biology and Regenerative Medicine, and Ludwig Center, Stanford, CA 94305, USA
- Department of Medicine, Division of Hematology, Stanford University School of Medicine, Stanford, CA 94305, USA
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12
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CD22 EXON 12 deletion as a pathogenic mechanism of human B-precursor leukemia. Proc Natl Acad Sci U S A 2010; 107:16852-7. [PMID: 20841423 DOI: 10.1073/pnas.1007896107] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Here, we report that primary leukemic cells from infants with newly diagnosed B-precursor leukemia express a truncated and functionally defective CD22 coreceptor protein that is unable to transmit apoptotic signals because it lacks most of the intracellular domain, including the key regulatory signal transduction elements and all of the cytoplasmic tyrosine residues. Expression of this structurally and functionally abnormal CD22 protein is associated with a very aggressive in vivo growth of patients' primary leukemia cells causing disseminated overt leukemia in SCID mice. The abnormal CD22 coreceptor is encoded by a profoundly aberrant mRNA arising from a splicing defect that causes the deletion of exon 12 (c.2208-c.2327) (CD22ΔE12) and results in a truncating frameshift mutation. The splicing defect is associated with multiple homozygous mutations within a 132-bp segment of the intronic sequence between exons 12 and 13. These mutations cause marked changes in the predicted secondary structures of the mutant CD22 pre-mRNA sequences that affect the target motifs for the splicing factors hnRNP-L, PTB, and PCBP that are up-regulated in infant leukemia cells. Forced expression of the mutant CD22ΔE12 protein in transgenic mice perturbs B-cell development, as evidenced by B-precursor/B-cell hyperplasia, and corrupts the regulation of gene expression, causing reduced expression levels of several genes with a tumor suppressor function. We further show that CD22ΔE12-associated unique gene expression signature is a discriminating feature of newly diagnosed infant leukemia patients. These striking findings implicate CD22ΔE12 as a previously undescribed pathogenic mechanism in human B-precursor leukemia.
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13
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Ueda K, Yamamoto G, Shinohara A, Hangaishi A, Kurokawa M. Early onset of acute lymphoblastic leukemia with MLL rearrangement after autologous stem cell transplantation for multiple myeloma. Ann Hematol 2009; 88:813-4. [DOI: 10.1007/s00277-008-0680-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2008] [Accepted: 12/16/2008] [Indexed: 11/29/2022]
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