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Capela de Matos RR, Othman M, Ferreira GM, Monteso K, de Souza MT, Rouxinol M, Melo JB, Carreira IM, Abdelhay E, Liehr T, Ribeiro RC, Silva M. Somatic homozygous loss of SH2B3, and a non-Robertsonian translocation t(15;21)(q25.3;q22.1) with NTRK3 rearrangement, in an adolescent with progenitor B-cell acute lymphoblastic leukemia with the iAMP21. Cancer Genet 2021; 262-263:16-22. [PMID: 34974289 DOI: 10.1016/j.cancergen.2021.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 11/04/2021] [Accepted: 12/20/2021] [Indexed: 11/18/2022]
Abstract
Intrachromosomal amplification of chromosome 21 (iAMP21) occurs in ∼2% of B-cell acute lymphoblastic leukemia (ALL) and is considered to confer a poor prognosis. The relapse risk is associated with therapy intensity, suggesting that other somatic mutations may influence iAMP21-ALL prognosis. This abnormality is characterized by multiple copies of the RUNX1 gene in chromosome 21 and appears to arise through multiple breakage-fusion bridge cycles and chromothripsis. Rob(15;21) or a ring chromosome 21 have been associated with an increased risk for iAMP21-ALL, suggesting that constitutional genetic abnormalities may also drive leukemogenesis. Here we describe homozygous deletion of the SH2B3 gene, chromothripsis of chromosome 21, and a non-Robertsonian somatic t(15;21)(q25.3;q22.1) with NTRK3 gene rearrangement in an adolescent with iAMP21-B-ALL. Molecular cytogenetic studies detected iAMP21 with aCGH analysis revealing further genomic imbalances. The RT-qPCR analysis detected elevated expression levels of RUNX1 (68-fold) and reduced expression of CDK6 (0.057-fold). Studies with constitutive cells collected from mouth swabs showed that SH2B3 biallelic deletion was a somatic alteration occurring during clonal evolution. The identification of novel secondary genetic changes was valuable to discuss sporadic iAMP21 leukemogenic mechanisms. For the first time, we show a t(15;21)(q25.3;q22.1) with NTRK3 rearrangement in an adolescent with iAMP21-ALL.
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Affiliation(s)
- R R Capela de Matos
- Cytogenetics Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil; Post-Graduate Programme in Oncology, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - Mak Othman
- Jena University Hospital, Institute of Human Genetics, Jena, Germany
| | - G M Ferreira
- Stem Cells Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - Kca Monteso
- Cytogenetics Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil; Post-Graduate Programme in Oncology, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - M T de Souza
- Cytogenetics Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - M Rouxinol
- Lagoa Federal Hospital, Rio de Janeiro, Brazil
| | - J B Melo
- Cytogenetics and Genomics Laboratory, Faculty of Medicine, University of Coimbra, Coimbra, Portugal; Centre of Investigation on Environment Genetics and Oncobiology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - I M Carreira
- Cytogenetics and Genomics Laboratory, Faculty of Medicine, University of Coimbra, Coimbra, Portugal; Centre of Investigation on Environment Genetics and Oncobiology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - E Abdelhay
- Stem Cells Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil; Post-Graduate Programme in Oncology, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil
| | - T Liehr
- Jena University Hospital, Institute of Human Genetics, Jena, Germany
| | - R C Ribeiro
- Departments of Oncology and Global Pediatric Medicine, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Mlm Silva
- Cytogenetics Department, Bone Marrow Transplantation Unit, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil; Post-Graduate Programme in Oncology, Instituto Nacional de Câncer José de Alencar Gomes da Silva (INCA-RJ), Rio de Janeiro, Brazil.
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Matos RRC, Mkrtchyan H, Amaral BAS, Liehr T, de Souza MT, Ney-Garcia DR, Santos N, Marques-Salles TJ, Ribeiro RC, Figueiredo AF, Silva MLM. An unusual cytogenetic rearrangement originating from two different abnormalities in chromosome 6 in a child with acute promyelocytic leukemia. Acta Haematol 2013; 130:23-6. [PMID: 23363773 DOI: 10.1159/000345828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Accepted: 10/24/2012] [Indexed: 11/19/2022]
Abstract
Acute promyelocytic leukemia (APL) is usually associated with a favorable outcome, but about 10% of patients tend to relapse. The genetic hallmark of APL is a balanced translocation involving chromosomes 15 and 17, and the PML-RARa gene fusion is found in more than 90% of these cases. Other chromosomal abnormalities are commonly found in APL, but their clinical significance has yet to be determined. Here we report a case of childhood APL that was studied by conventional cytogenetics along with molecular cytogenetic techniques. The patient showed a complex karyotype with an unusual cytogenetic rearrangement originating from two different abnormalities in a single chromosome 6. Our case is an exceptional example of a cryptic cytogenetic anomaly in APL and underscores the importance of detailed genetic characterization.
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MESH Headings
- Child
- Chromosome Banding
- Chromosomes, Human, Pair 15
- Chromosomes, Human, Pair 17
- Chromosomes, Human, Pair 6
- Gene Rearrangement
- Humans
- In Situ Hybridization, Fluorescence
- Leukemia, Promyelocytic, Acute/genetics
- Male
- Translocation, Genetic/genetics
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Affiliation(s)
- R R C Matos
- Bone Marrow Unit, Cytogenetics Department, National Cancer Institute, Rio de Janeiro, Brazil
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de Souza MT, Lecadet MM, Lereclus D. Full expression of the cryIIIA toxin gene of Bacillus thuringiensis requires a distant upstream DNA sequence affecting transcription. J Bacteriol 1993; 175:2952-60. [PMID: 8491716 PMCID: PMC204613 DOI: 10.1128/jb.175.10.2952-2960.1993] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The cryIIIA gene encoding a coleopteran-specific toxin is poorly expressed in Bacillus thuringiensis when cloned in a low-copy-number plasmid. This weak expression is observed when the gene is cloned only with its promoter and its putative terminator. cryIIIA gene expression was analyzed by using deletion derivatives of a larger DNA fragment carrying the toxin gene and additional adjacent sequences. The results indicate that a 1-kb DNA fragment located 400 bp upstream of the promoter strongly enhances CryIIIA production in B. thuringiensis sporulating cells. Similar results were obtained when the low-copy-number plasmid pHT304 carrying transcriptional fusions between upstream regions of cryIIIA and the lacZ gene was used. Analysis of the start sites, the sizes, and the amounts of cryIIIA-specific mRNAs shows that the enhancement occurs at the transcriptional level by increasing the number of cryIIIA-specific transcripts from the onset of sporulation to about 6 h after the onset of sporulation. The nucleotide sequence of the 1-kb activating fragment and of the 700 bp containing the promoter region and the 5' end of cryIIIA were determined. No potential protein-coding sequences were found upstream of the promoter. The major characteristic of the 1-kb activating fragment is the presence of a 220-bp A + T-rich region.
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Affiliation(s)
- M T de Souza
- Département des Biotechnologies, 1300 Centre National de la Recherche Scientifique, Institut Pasteur, Paris, France
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Abstract
The case of a 31 years old woman with multiple intracranial mycotic aneurysms in association with subacute bacterial endocarditis is reported. The authors discuss the clinical and pathological aspects of such lesions. The complete regression of all the aneurysms after antibiotic therapy favours an approach aiming at adequate control of the infection prior to any consideration of surgical treatment.
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