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Farra C, Raimondi S, Abboud M. Acquired centromeric heteromorphism of chromosome 7 yields discordant results between fluorescent in situ hybridization and karyotype analysis in a child with severe congenital neutropenia. Pediatr Hematol Oncol 2019; 36:432-437. [PMID: 31411529 DOI: 10.1080/08880018.2019.1648622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Monosomy 7 is an indicator of malignant transformation in patients with different subtypes of severe congenital neutropenias (SCNs). We present the case of a 5-year-old male diagnosed with SCN. Standard karyotype and fluorescent in situ hybridization (FISH) analyses for centromere of chromosome 7 (chromosome enumeration probe 7 [CEP7]) in bone marrow samples showed disomy for chromosome 7 and a single copy of CEP7. In all cells examined, karyotype analysis of peripheral PHA-stimulated blood samples revealed disomy for chromosome 7. Our results address the issue of centromeric heteromorphism in cytogenetic analysis. Herein, we report a case where FISH using CEP7 in the bone marrow sample showed the presence of only one signal suggesting monosomy seven due to an acquired heteromorphism, whereas extensive conventional karyotyping showed disomy of chromosome 7.
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Affiliation(s)
- Chantal Farra
- Medical Genetics Unit, Department of Pathology and Laboratory Medicine, American University of Beirut Medical Center , Beirut , Lebanon.,Department of Pediatrics and Adolescent Medicine, American University of Beirut Medical Center , Beirut , Lebanon
| | - Susana Raimondi
- Department of Pathology, St. Jude Children's Research Hospital , Memphis , TN , USA
| | - Miguel Abboud
- Department of Pediatrics and Adolescent Medicine, American University of Beirut Medical Center , Beirut , Lebanon
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Czuchlewski DR, Farzanmehr H, Robinett S, Haines S, Reichard KK. t(9;22)(q34;q11.2) is a recurrent constitutional non-Robertsonian translocation and a rare cytogenetic mimic of chronic myeloid leukemia. Cancer Genet 2012; 204:572-6. [PMID: 22137489 DOI: 10.1016/j.cancergen.2011.10.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Revised: 10/14/2011] [Accepted: 10/17/2011] [Indexed: 01/26/2023]
Abstract
The diagnosis of hematologic malignancy can be greatly aided by the detection of a cytogenetic abnormality. However, care must be taken to ensure that constitutional chromosomal abnormalities are not misattributed to a putative population of malignant cells. Here we present an unusual case in which a constitutional balanced t(9;22)(q34;q11.2) cytogenetically mimicked the acquired, t(9;22)(q34;q11.2), that is characteristic of chronic myeloid leukemia. Of special note, fluorescence in situ hybridization (FISH) analysis for this constitutional translocation (9;22)(q34;q11.2) using standard probes for BCR and ABL1 resulted in an abnormal pattern that was potentially misinterpretable as a BCR-ABL1 fusion. This is the first reported FISH analysis of a constitutional t(9;22)(q34;q11.2), and overall only the second report of such an abnormality. In light of the isolated prior report, our case also suggests that the constitutional t(9;22)(q34;q11.2) is one of the very few recurrent constitutional non-Robertsonian translocations described in humans. Our case underscores the necessity of complete clinical and laboratory correlation to avoid misdiagnosis of myeloid malignancy in the setting of rare constitutional cytogenetic abnormalities.
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Roberts KA, Martineau M, Broadfield ZJ, Gibson BES, Harewood L, Stewart J, Harrison CJ. A diminutive chromosome 21 centromere in acute lymphoblastic leukemia. ACTA ACUST UNITED AC 2006; 167:78-81. [PMID: 16682292 DOI: 10.1016/j.cancergencyto.2005.10.010] [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: 08/16/2005] [Revised: 10/14/2005] [Accepted: 10/17/2005] [Indexed: 12/01/2022]
Abstract
A chance observation of a tiny constitutional variant for the centromere of chromosome 21 in two patients with acute lymphoblastic leukemia (ALL), suggested a possible correlation with the cytogenetic findings in their leukemic cells. Interphase FISH revealed three 13/21 centromeric signals and a single MLL signal in the blast cells of each patient. Metaphase FISH with dual-color application of whole-chromosome paint (wcp) and centromeric probes for chromosome 21 showed two copies of chromosome 21, one with a tiny centromeric signal which corresponded to the invisible centromere in the interphase cells. Patient 2700 had a normal karyotype in his bone marrow at diagnosis. All metaphases from his stimulated peripheral blood also had the tiny chromosome 21 centromere, proving it to be a constitutional variant. Patient 3314 showed the abnormal karyotype 46,XY,inv(1)(p?q?),del(11)(q?),del(12)(p?),inc in his bone marrow. Interphase FISH revealed only one copy each of the ABL and ETV6 genes, in addition to the loss of the MLL signal. The question arises, is there an association between the diminutive centromeric signals for chromosome 21 and the chromosomal instability demonstrated by the deletions of key genes from the leukemic blasts of these two patients?
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Affiliation(s)
- Kathryn A Roberts
- LRF Cytogenetics Group, Cancer Sciences Division, University of Southampton, MP 822, Duthie Building, Southampton General Hospital, Tremona Road, Southampton, SO16 6YD, UK
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Castagné C, Mühlematter D, Beyer V, Parlier V, van Melle G, Jotterand M. Determination of cutoff values to detect small aneuploid clones by interphase fluorescence in situ hybridization: the Poisson model is a more appropriate approach. Should single-cell trisomy 8 be considered a clonal defect? ACTA ACUST UNITED AC 2003; 147:99-109. [PMID: 14623458 DOI: 10.1016/s0165-4608(03)00189-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We applied a dual-color interphase in situ fluorescence hybridization (I-FISH) technique using centromeric probes specific to chromosomes 7 and 8 on 20 control samples in order to define the statistical model best suited to determine cutoff values for detection of small abnormal clones. We found that the Poisson model is a more appropriate approach than a Gaussian model. Then, based on the analysis of 91 samples from 80 patients with myelocytic malignant hemopathies and either clonal or nonclonal -7 or +8 as determined with conventional cytogenetics (CC), we compared the respective power of I-FISH and CC for detection of aneuploidy, with special emphasis on the potential contribution of I-FISH as a complement to CC in the case of small abnormal clones. The I-FISH results were positive in samples with clonal -7 or +8 according to CC analysis. Whereas I-FISH was negative in samples with nonclonal -7 according to CC, thus confirming the reliability of the criteria used to define the clonality of -7; the situation was different with nonclonal +8. I-FISH revealed the clonality of +8 in most samples with single-cell +8. In several cases, however, the unquestionable clonal nature of +8, as evidenced during follow-up, could not be established with either CC or I-FISH according to accepted criteria. Our data suggest that, in case of a single metaphase with +8, the general rule should be amended and the single-cell +8 should be considered and reported as potentially clonal.
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Affiliation(s)
- Chantal Castagné
- Unité de cytogénétique du cancer, Service de génétique médicale, Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland
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Goobie S, Popovic M, Morrison J, Ellis L, Ginzberg H, Boocock GRB, Ehtesham N, Bétard C, Brewer CG, Roslin NM, Hudson TJ, Morgan K, Fujiwara TM, Durie PR, Rommens JM. Shwachman-Diamond syndrome with exocrine pancreatic dysfunction and bone marrow failure maps to the centromeric region of chromosome 7. Am J Hum Genet 2001; 68:1048-54. [PMID: 11254457 PMCID: PMC1275624 DOI: 10.1086/319505] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2000] [Accepted: 01/18/2001] [Indexed: 11/03/2022] Open
Abstract
Shwachman-Diamond syndrome (SDS) is an autosomal recessive disorder characterized by exocrine pancreatic insufficiency and hematologic and skeletal abnormalities. A genomewide scan of families with SDS was terminated at approximately 50% completion, with the identification of chromosome 7 markers that showed linkage with the disease. Finer mapping revealed significant linkage across a broad interval that included the centromere. The maximum two-point LOD score was 8.7, with D7S473, at a recombination fraction of 0. The maximum multipoint LOD score was 10, in the interval between D7S499 and D7S482 (5.4 cM on the female map and 0 cM on the male map), a region delimited by recombinant events detected in affected children. Evidence from all 15 of the multiplex families analyzed provided support for the linkage, consistent with a single locus for SDS. However, the presence of several different mutations is suggested by the heterogeneity of disease-associated haplotypes in the candidate region.
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Affiliation(s)
- Sharan Goobie
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Maja Popovic
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Jodi Morrison
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Lynda Ellis
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Hedy Ginzberg
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Graeme R. B. Boocock
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Nadia Ehtesham
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Christine Bétard
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Carl G. Brewer
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Nicole M. Roslin
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Thomas J. Hudson
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Kenneth Morgan
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - T. Mary Fujiwara
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Peter R. Durie
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
| | - Johanna M. Rommens
- Programs in Genetics and Genomic Biology and Integrative Biology, Research Institute, and Division of Gastroenterology and Nutrition, The Hospital for Sick Children, and Departments of Molecular and Medical Genetics and Paediatrics, University of Toronto, Toronto; and Montreal Genome Centre, McGill University Health Centre Research Institute, and Departments of Human Genetics and Medicine, McGill University, Montreal
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