1
|
Wu C, Zhang J, Bai S, Yao J, Qiu H, Xue Y, Chen S, Wu Y, Shen J, Pan J. Clinical and molecular cytogenetic studies in ten patients with hematological malignancies characterized by t(20;21)(q11;q11) resulted from del(20q). Cancer Genet 2016; 209:456-462. [PMID: 27810074 DOI: 10.1016/j.cancergen.2016.09.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 07/26/2016] [Accepted: 09/15/2016] [Indexed: 11/16/2022]
Abstract
This study reports 10 patients with hematological malignances with t(20;21)(q11;q11) resulting from del(20q) (for example, der(20)del(20)(q11q13)t(20;21)(q11;q11) and der(21)t(20;21)(q11;q11)) and described their clinical features and the possible prognostic significance of this abnormality. The t(20;21)(q11;q11) was a rare but recurrent abnormality secondary to del(20q) besides i(20q-). The frequency of der(20)del(20)(q11q13)t(20;21)(q11;q11) among our patients with del(20q) was 2.4%. It was considered that the 20q deletion preceded translocation with chromosome 21. This abnormality is often cryptic, occurs predominantly in older men and is observed most often in myelodysplastic syndromes. Patients with this abnormality have an unfavorable prognosis, similar to patients with i(20q-). The molecular consequences of der(20)del(20)(q11q13)t(20;21)(q11;q11) may be different from patients with i(20q-). To the best of our knowledge this is the largest dataset published to date.
Collapse
Affiliation(s)
- Chunxiao Wu
- Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Jun Zhang
- Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Shuxiao Bai
- Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | | | - Huiying Qiu
- Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Yongquan Xue
- Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Suning Chen
- Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Yafang Wu
- Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Juan Shen
- Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Jinlan Pan
- Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China.
| |
Collapse
|
2
|
Mackinnon RN, Wall M, Zordan A, Nutalapati S, Mercer B, Peverall J, Campbell LJ. Genome organization and the role of centromeres in evolution of the erythroleukaemia cell line HEL. EVOLUTION MEDICINE AND PUBLIC HEALTH 2013; 2013:225-40. [PMID: 24481202 PMCID: PMC3868402 DOI: 10.1093/emph/eot020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND AND OBJECTIVES The human erythroleukaemia (HEL) cell line has a highly rearranged genome. We matched whole chromosome analysis with cytogenomic microarray data to build a detailed description of these rearrangements. METHODOLOGY We used a combination of single nucleotide polymorphism array and multiple fluorescence in situ hybridization approaches, and compared our array data with publicly available data for different sublines of HEL. B allele frequencies revealed the fate of each homologue for most chromosomes. RESULTS At least two instances of the breakage-fusion-bridge cycle appear to have facilitated amplification of oncogenes and deletion of tumour suppressor genes. Because our study included centromere identification, we found that some abnormal chromosomes had centromeres that did not match the identity of the rest of the chromosome. CONCLUSIONS AND IMPLICATIONS This study highlights the variety of complementary methods required to understand remodelling of the genome in cancer and uncover some of the mechanisms involved. We present evidence of centromere capture as a means of preserving broken chromosome segments. Testing for another highly repetitive DNA region, the nucleolus organizer region, helped identify the steps involved in chromosome 9 copy number aberrations. Increased use of techniques for identifying centromeres and other repetitive DNA regions will add to our understanding of genome remodelling and evolution. The pattern of chromosome 20 aberration in HEL supports an association of 20q11.21 amplification with erythroleukaemia (acute myeloid leukaemia subtype M6) in the context of 20q12 deletion. The differences between the karyotypes in different HEL sublines highlight the constantly evolving genomes of cultured cell lines.
Collapse
Affiliation(s)
- Ruth N Mackinnon
- Victorian Cancer Cytogenetics Service, St Vincent's Hospital, Melbourne, Fitzroy, Vic, Australia; Department of Medicine, St Vincent's Hospital, University of Melbourne, Melbourne, Vic, Australia; and PathWest Department of Diagnostic Genomics, QEII Medical Centre, Nedlands, WA, Australia
| | | | | | | | | | | | | |
Collapse
|
3
|
Mackinnon RN, Campbell LJ. Chromothripsis under the microscope: a cytogenetic perspective of two cases of AML with catastrophic chromosome rearrangement. Cancer Genet 2013; 206:238-51. [PMID: 23911237 DOI: 10.1016/j.cancergen.2013.05.021] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 05/16/2013] [Accepted: 05/28/2013] [Indexed: 12/21/2022]
Abstract
Chromothripsis is a recently described phenomenon identified in cancer cells that produces catastrophic chromosome reorganization of one or a small number of chromosomes. It has been proposed that the multiple breakage events occur at a single point in time. Here we introduce the term anachromosome to describe an abnormal chromosome produced by chromothripsis. We report two cases of acute myeloid leukemia matching the description of chromothripsis that illustrate different aspects of this phenomenon from a cytogenetic perspective. Fluorescence in situ hybridization (FISH) analyses, including multicolor FISH and FISH for repeat elements that are not present on microarrays and that are resistant to sequencing, helped interpret the rearrangements but did not reveal their level of complexity. The anachromosomes conformed to the normal constraints of chromosome structure by including segments that provide two telomeres and a centromere. In patient samples, there are mixtures of cells with and without deletions. The deletion B allele frequencies for heterozygous loci in a mixture of cells with and without the deletions create a distinctive array pattern that is consistent with all the deletions in the anachromosomes having occurred concurrently. This evidence supporting the single-event hypothesis for chromothripsis has not previously been highlighted, to our knowledge. In the context of exploring mechanisms for chromosome shattering, we discuss a possible connection between chromosome pulverization and fragile sites. Understanding chromothripsis in the context of chromosome biology will help us identify its causes and consequences.
Collapse
Affiliation(s)
- Ruth N Mackinnon
- Victorian Cancer Cytogenetics Service, St Vincent's Hospital Melbourne, Fitzroy, Australia.
| | | |
Collapse
|
4
|
MacKinnon RN, Duivenvoorden HM, Campbell LJ. Unbalanced translocations of 20q in AML and MDS often involve interstitial rather than terminal deletions of 20q. Cancer Genet 2011; 204:153-61. [PMID: 21504715 DOI: 10.1016/j.cancergen.2010.12.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 08/30/2010] [Accepted: 11/23/2010] [Indexed: 11/28/2022]
Abstract
Dicentric chromosomes can occur in myelodysplastic syndromes and acute myeloid leukemia. As these unbalanced rearrangements often combine two recurrent deletions, they could be an efficient mechanism for the loss of two tumor suppressor genes in a single step. We report here that dicentric chromosomes involving chromosome 20 with loss of the 20q12 putative tumor suppressor gene are often the result of more complex rearrangements, with the 20q12 region being lost by an interstitial deletion independent of the site of translocation. We found interstitial deletions of 20q in two thirds of the two-way translocations tested. This points to a more complex mechanism of translocation involving at least three breakpoints and two separate events, and raises questions about the order of these events and the significance of these abnormalities.
Collapse
Affiliation(s)
- Ruth N MacKinnon
- Victorian Cancer Cytogenetics Service, St. Vincent's Hospital, Melbourne, Victoria, Australia.
| | | | | |
Collapse
|
5
|
Mullier F, Daliphard S, Garand R, Dekeyser M, Cornet Y, Luquet I, Talmant P, Richebourg S, Jamar M, Dogné JM, Chatelain C, Michaux L, Chatelain B. Morphology, cytogenetics, and survival in myelodysplasia with del(20q) or ider(20q): a multicenter study. Ann Hematol 2011; 91:203-13. [PMID: 21744002 DOI: 10.1007/s00277-011-1286-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 06/16/2011] [Indexed: 10/18/2022]
Abstract
Isochromosome of the long arm of chromosome 20 with interstitial loss of material [ider(20q)] is a rare cytogenetic abnormality reported in myelodysplastic syndrome (MDS), with neither specific morphological pattern nor clear prognostic significance. The aim of this retrospective multicentric study is to compare the peripheral blood and bone marrow morphology of MDS patients with ider(20q) (n = 13) and del(20q) (n = 21) and controls (n = 47) in order to investigate whether the ider(20q) harbors specific morphological features. The secondary objective is to compare the outcome of patients from both groups. This study performed on the largest cohort of MDS patients with ider(20q) is the first that identifies specific morphological features (hypogranulated and vacuolized neutrophils and neutrophil erythrophagocytosis) allowing the identification of this cytogenetic abnormality with high sensitivity (70%) and specificity (85.7%). Suspected ider(20q) by morphology should therefore support targeted FISH tests in case of non informative karyotype. This combined approach will allow a better estimation of the prevalence of this underdiagnozed entity. The overall survival and progression-free survival did not statistically differ in both groups. However, hypogranulated and vacuolized neutrophils were significantly associated with survival.
Collapse
Affiliation(s)
- François Mullier
- Laboratory of Hematology, Namur Thrombosis and Hemostasis Center (NTHC), Namur Research Institute for LIfe Sciences (NARILIS), UCL Mont-Godinne, Avenue Gaston Therasse 1, 5530, Yvoir, Belgium.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
MacKinnon RN, Selan C, Wall M, Baker E, Nandurkar H, Campbell LJ. The paradox of 20q11.21 amplification in a subset of cases of myeloid malignancy with chromosome 20 deletion. Genes Chromosomes Cancer 2010; 49:998-1013. [DOI: 10.1002/gcc.20806] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
|
7
|
Douet-Guilbert N, Laï JL, Basinko A, Gueganic N, Andrieux J, Pollet B, Plantier I, Delattre C, Crépin O, Corm S, Le Bris MJ, Morel F, De Braekeleer M. Fluorescencein situhybridization characterization of ider(20q) in myelodysplastic syndrome. Br J Haematol 2008; 143:716-20. [DOI: 10.1111/j.1365-2141.2008.07436.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
8
|
Shetty S, Roland B. Isoderivative chromosome 20 in bone marrow: three new cases. ACTA ACUST UNITED AC 2008; 184:72-3. [DOI: 10.1016/j.cancergencyto.2008.03.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2008] [Accepted: 03/03/2008] [Indexed: 11/26/2022]
|
9
|
Li T, Xue Y, Zhang J, Chen S, Pan J, Wu Y, Wang Y, Shen J. Isodicentric 20q− in two cases of B-cell acute lymphocytic leukemia with the respective t(9;20)(p11;q11.2) and t(9;22)(q34;q11.2). ACTA ACUST UNITED AC 2008; 181:55-9. [DOI: 10.1016/j.cancergencyto.2007.11.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2007] [Accepted: 11/14/2007] [Indexed: 11/29/2022]
|
10
|
Mackinnon RN, Campbell LJ. Dicentric chromosomes and 20q11.2 amplification in MDS/AML with apparent monosomy 20. Cytogenet Genome Res 2008; 119:211-20. [PMID: 18253031 DOI: 10.1159/000112063] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/16/2007] [Indexed: 01/15/2023] Open
Abstract
FISH analysis of 41 previously karyotyped cases of MDS and AML with apparent monosomy of chromosome 20 revealed a variety of dicentric abnormalities involving chromosome 20. These usually, but not always, involved a breakpoint in the long arm of chromosome 20 and loss of the common deleted region at 20q12. Not one case of true monosomy 20 was confirmed. We found evidence for dicentric chromosome formation in 21 of 24 unbalanced translocations containing chromosome 20 and that were studied in more detail. Subsequent loss of one of the centromeres had occurred in eight of these 24 cases, and was more frequent than centromere inactivation as a means of resolving the inherent instability of a dicentric chromosome. In the three cases with dicentric chromosomes from which proximal 20q had been excised along with the 20 centromere, the excised segment was retained, and in two of these it was amplified. Proximal 20q was clearly retained in all but three cases, and present in three or more copies in 17 of 41 cases. The retention and amplification of proximal 20q provides support for the hypothesis that there is an oncogene located in this region of 20q that is activated in cases of MDS/AML with del(20q). Apparent monosomy 20 in MDS/AML should be treated as evidence of unidentified chromosome 20 abnormalities, and familiarity with the typical G-banded morphology of these derivatives can help with their identification. The reported incidence of dicentric chromosomes is clearly an under-estimate but is increasing in myeloid disorders as more cases are studied with methods allowing their detection.
Collapse
Affiliation(s)
- R N Mackinnon
- Victorian Cancer Cytogenetics Service, St Vincent's Hospital, University of Melbourne, Melbourne, Australia.
| | | |
Collapse
|
11
|
Smoley SA, Fink SR, Paternoster SF, Stockero KJ, Nguyen LP, Nguyen PL, Hanson CA, Dewald GW. Frequency, hematopathology, and detection of a new isodicentric variant of deletion 20q. ACTA ACUST UNITED AC 2007; 173:144-9. [PMID: 17321330 DOI: 10.1016/j.cancergencyto.2006.11.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2006] [Accepted: 11/02/2006] [Indexed: 11/18/2022]
Abstract
The ider(20)(p11.21)del(20)(q11q13) anomaly was recognized only recently. Thus, its frequency and clinical significance has not been extensively studied. Due to small size and ambiguous G-band pattern, ider(20q) is usually missed in cytogenetic studies. Furthermore, the commercial FISH probe D20S108 does not distinguish among del(20q), ider(20q), and monosomy 20. Thus, we determined the frequency and hematopathology of patients with ider(20q), and the best cytogenetic methods to detect chromosome 20 anomalies. To do this, we performed FISH on interphase and metaphase cells for 12 patients with -20,+mar and 12 patients with only del(20q) in their karyotype. The marker chromosome in patients with -20,+mar proved to be ider(20q). FISH with D20S108 and 20qter distinguished ider(20q) from del(20q) and monosomy 20. Review of blood and bone marrow slides for nine patients with ider(20q) showed that one had acute myeloid leukemia and eight had myelodysplastic syndromes. Patients with ider(20q) had a more consistent presentation of multilineage dysplasia with additional involvement of the granulocytic series than patients with del(20q). This study shows ider(20q) is common in clinical practice--1/10th the incidence of del(20q)--and is strongly associated with myelodysplasia and acute myeloid leukemia.
Collapse
Affiliation(s)
- Stephanie A Smoley
- Division of Laboratory Genetics, Department of Laboratory Medicine and Pathology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Lim TH, Lim AST, Tien SL. A novel isoderivative chromosome 20 in a patient with chronic myelomonocytic leukemia. ACTA ACUST UNITED AC 2006; 170:80-2. [PMID: 16965963 DOI: 10.1016/j.cancergencyto.2006.04.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2006] [Revised: 04/05/2006] [Accepted: 04/12/2006] [Indexed: 11/26/2022]
|
13
|
Current Awareness in Hematological Oncology. Hematol Oncol 2006. [DOI: 10.1002/hon.754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
14
|
MacKinnon RN, Patsouris C, Chudoba I, Campbell LJ. A FISH comparison of variant derivatives of the recurrent dic(17;20) of myelodysplastic syndromes and acute myeloid leukemia: Obligatory retention of genes on 17p and 20q may explain the formation of dicentric chromosomes. Genes Chromosomes Cancer 2006; 46:27-36. [PMID: 17048234 DOI: 10.1002/gcc.20385] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The dic(17;20) is a recurrent unbalanced translocation occurring rarely in myelodysplastic syndromes and acute myeloid leukemia. We have studied eleven cases with the dic(17;20) or a more complex derivative, all of which showed deletion of 17p and 20q material. The tumor suppressor gene TP53 was not always lost, supporting a more distal gene as the target of these 17p deletions. All derivatives could be interpreted as having initially been formed as a dicentric chromosome, those with a larger amount of material between the centromeres having undergone further rearrangement to stabilize the chromosome while retaining proximal 17p and proximal 20q material. We propose that critical sequences on both 17p and 20q proximal to the sites of deletion must be retained during the critical 17p and 20q deletions. This would explain the excess of dicentric chromosomes resulting from 17;20 translocation, and the apparent stabilization of the unstable derivatives by further rearrangements which preserve 17p and 20q material.
Collapse
Affiliation(s)
- Ruth N MacKinnon
- Victorian Cancer Cytogenetics Service, St. Vincent's Hospital Melbourne, Australia.
| | | | | | | |
Collapse
|