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Fernandes AM, Rocha-Braz MGM, França MM, Lerario AM, Simões VRF, Zanardo EA, Kulikowski LD, Martin RM, Mendonca BB, Ferraz-de-Souza B. The molecular landscape of osteogenesis imperfecta in a Brazilian tertiary service cohort. Osteoporos Int 2020; 31:1341-1352. [PMID: 32123938 DOI: 10.1007/s00198-020-05366-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 02/21/2020] [Indexed: 10/24/2022]
Abstract
UNLABELLED We have sought the molecular diagnosis of OI in 38 Brazilian cases through targeted sequencing of 15 candidate genes. While 71% had type 1 collagen-related OI, defects in FKBP10, PLOD2 and SERPINF1, and a potential digenic P3H1/WNT1 interaction were prominent causes of OI in this underrepresented population. INTRODUCTION Defects in type 1 collagen reportedly account for 85-90% of osteogenesis imperfecta (OI) cases, but most available molecular data has derived from Sanger sequencing-based approaches in developed countries. Massively parallel sequencing (MPS) allows for systematic and comprehensive analysis of OI genes simultaneously. Our objective was to obtain the molecular diagnosis of OI in a single Brazilian tertiary center cohort. METHODS Forty-nine individuals (84% adults) with a clinical diagnosis of OI, corresponding to 30 sporadic and 8 familial cases, were studied. Sixty-three percent had moderate to severe OI, and consanguinity was common (26%). Coding regions and 25-bp boundaries of 15 OI genes (COL1A1, COL1A2, IFITM5 [plus 5'UTR], SERPINF1, CRTAP, P3H1, PPIB, SERPINH1, FKBP10, PLOD2, BMP1, SP7, TMEM38B, WNT1, CREB3L1) were analyzed by targeted MPS and variants of interest were confirmed by Sanger sequencing or SNP array. RESULTS A molecular diagnosis was obtained in 97% of cases. COL1A1/COL1A2 variants were identified in 71%, whereas 26% had variants in other genes, predominantly FKBP10, PLOD2, and SERPINF1. A potential digenic interaction involving P3H1 and WNT1 was identified in one case. Phenotypic variability with collagen defects could not be explained by evident modifying variants. Four consanguineous cases were associated to heterozygous COL1A1/COL1A2 variants, and two nonconsanguineous cases had compound PLOD2 heterozygosity. CONCLUSIONS Novel disease-causing variants were identified in 29%, and a higher proportion of non-collagen defects was seen. Obtaining a precise diagnosis of OI in underrepresented populations allows expanding our understanding of its molecular landscape, potentially leading to improved personalized care in the future.
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Affiliation(s)
- A M Fernandes
- Laboratorio de Endocrinologia Celular e Molecular LIM-25 e Unidade de Doencas Osteometabolicas, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - M G M Rocha-Braz
- Laboratorio de Endocrinologia Celular e Molecular LIM-25 e Unidade de Doencas Osteometabolicas, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - M M França
- Laboratorio de Hormonios e Genetica Molecular LIM-42, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
- Department of Medicine, Section of Endocrinology, The University of Chicago, Chicago, IL, 60637, USA
| | - A M Lerario
- Laboratorio de Hormonios e Genetica Molecular LIM-42, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
- Department of Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan, Ann Arbor, MI, USA
- Laboratorio de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - V R F Simões
- Laboratorio de Endocrinologia Celular e Molecular LIM-25 e Unidade de Doencas Osteometabolicas, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - E A Zanardo
- Laboratorio de Citogenomica, Departamento de Patologia, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - L D Kulikowski
- Laboratorio de Citogenomica, Departamento de Patologia, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - R M Martin
- Laboratorio de Hormonios e Genetica Molecular LIM-42, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - B B Mendonca
- Laboratorio de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - B Ferraz-de-Souza
- Laboratorio de Endocrinologia Celular e Molecular LIM-25 e Unidade de Doencas Osteometabolicas, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil.
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Castro LP, Sahbatou M, Kehdy FSG, Farias AA, Yurchenko AA, de Souza TA, Rosa RCA, Mendes-Junior CT, Borda V, Munford V, Zanardo ÉA, Chehimi SN, Kulikowski LD, Aquino MM, Leal TP, Tarazona-Santos E, Chaibub SC, Gener B, Calmels N, Laugel V, Sarasin A, Menck CFM. The Iberian legacy into a young genetic xeroderma pigmentosum cluster in central Brazil. Mutat Res 2020; 852:503164. [PMID: 32265042 DOI: 10.1016/j.mrgentox.2020.503164] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Revised: 02/22/2020] [Accepted: 02/25/2020] [Indexed: 10/24/2022]
Abstract
In central Brazil, in the municipality of Faina (state of Goiás), the small and isolated village of Araras comprises a genetic cluster of xeroderma pigmentosum (XP) patients. The high level of consanguinity and the geographical isolation gave rise to a high frequency of XP patients. Recently, two founder events were identified affecting that community, with two independent mutations at the POLH gene, c.764 + 1 G > A (intron 6) and c.907 C > T; p.Arg303* (exon 8). These deleterious mutations lead to the xeroderma pigmentosum variant syndrome (XP-V). Previous reports identified both mutations in other countries: the intron 6 mutation in six patients (four families) from Northern Spain (Basque Country and Cantabria) and the exon 8 mutation in two patients from different families in Europe, one of them from Kosovo. In order to investigate the ancestry of the XP patients and the age for these mutations at Araras, we generated genotyping information for 22 XP-V patients from Brazil (16), Spain (6) and Kosovo (1). The local genomic ancestry and the shared haplotype segments among the patients showed that the intron 6 mutation at Araras is associated with an Iberian genetic legacy. All patients from Goiás, homozygotes for intron 6 mutation, share with the Spanish patients identical-by-descent (IBD) genomic segments comprising the mutation. The entrance date for the Iberian haplotype at the village was calculated to be approximately 200 years old. This result is in agreement with the historical arrival of Iberian individuals at the Goiás state (BR). Patients from Goiás and the three families from Spain share 1.8 cM (family 14), 1.7 cM (family 15), and a more significant segment of 4.7 cM within family 13. On the other hand, the patients carrying the exon 8 mutation do not share any specific genetic segment, indicating an old genetic distance between them or even no common ancestry.
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Affiliation(s)
- L P Castro
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - M Sahbatou
- Foundation Jean Dausset - CEPH, Paris, France
| | - F S G Kehdy
- Leprosy Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - A A Farias
- Human Genome and Stem-Cell Center, Institute of Biosciences, University of São Paulo (USP), Sao Paulo, Brazil; Department of Genetics and Evolutionary Biology, Biosciences Institute, University of São Paulo (USP), São Paulo, Brazil
| | - A A Yurchenko
- Inserm U981, Gustave Roussy Cancer Campus, Université Paris Saclay, Villejuif, France
| | - T A de Souza
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - R C A Rosa
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - C T Mendes-Junior
- Department of Chemistry, Forensic and Genomics Research Laboratory, Faculty of Philosophy, Sciences and Letters, University of São Paulo, Ribeirão Preto, Brazil
| | - V Borda
- National Laboratory for Scientific Computation (LNCC), Petropolis, Rio de Janeiro, Brazil
| | - V Munford
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - É A Zanardo
- Cytogenomics Laboratory, Department of Pathology, School of Medicine, University of São Paulo (FMUSP), São Paulo, Brazil
| | - S N Chehimi
- Cytogenomics Laboratory, Department of Pathology, School of Medicine, University of São Paulo (FMUSP), São Paulo, Brazil
| | - L D Kulikowski
- Cytogenomics Laboratory, Department of Pathology, School of Medicine, University of São Paulo (FMUSP), São Paulo, Brazil
| | - M M Aquino
- Department of Genetics, Ecology and Evolution, Institute of Biological Sciences, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - T P Leal
- Department of Genetics, Ecology and Evolution, Institute of Biological Sciences, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - E Tarazona-Santos
- Department of Genetics, Ecology and Evolution, Institute of Biological Sciences, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - S C Chaibub
- General Hospital of Goiania, Goiania, Brazil
| | - B Gener
- Osakidetza Basque Health Service, Cruces University Hospital. Department of Genetics, Bizkaia, Spain; Biocruces Bizkaia Health Research Institute, Bizkaia, Spain
| | - N Calmels
- Laboratory of Medical Genetics, Institute of Medical Genetics of Alsace (IGMA), Strasbourg, France
| | - V Laugel
- Laboratory of Medical Genetics, Institute of Medical Genetics of Alsace (IGMA), Strasbourg, France
| | - A Sarasin
- UMR8200 CNRS, Gustave Roussy Institute, University Paris-Saclay, Villejuif, France
| | - C F M Menck
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.
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Ceroni JRM, Dutra RL, Honjo RS, Llerena JC, Acosta AX, Medeiros PFV, Galera MF, Zanardo ÉA, Piazzon FB, Dias AT, Novo-Filho GM, Montenegro MM, Madia FAR, Bertola DR, de Melo JB, Kulikowski LD, Kim CA. A Multicentric Brazilian Investigative Study of Copy Number Variations in Patients with Congenital Anomalies and Intellectual Disability. Sci Rep 2018; 8:13382. [PMID: 30190605 PMCID: PMC6127201 DOI: 10.1038/s41598-018-31754-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 08/21/2018] [Indexed: 12/13/2022] Open
Abstract
Genomic imbalances are the most common cause of congenital anomalies (CA) and intellectual disability (ID). The aims of this study were to identify copy number variations (CNVs) in 416 patients with CA and ID from 5 different genetics centers within 4 different states by using the Multiplex Ligation-dependent Probe Amplification (MLPA) technique and to apply the chromosomal microarray (CMA) methodology in selected cases. The samples were analyzed by MLPA kits P064, P036, P070 and P250. Positive results were found in 97/416 (23.3%) patients. CMA was applied in 14 selected cases. In 6/14 (42.85%) patients, CMA detected other copy number variations not detected by the MLPA studies. Although CMA is indispensable for genotype refinement, the technique is still unfeasible in some countries as a routine analysis due to economic and technical limitations. In these cases, clinical evaluation followed by karyotyping and MLPA analysis is a helpful and affordable solution for diagnostic purposes.
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Affiliation(s)
- J R M Ceroni
- Unidade de Genética, Departamento de Pediatria, Instituto da Criança, Hospital das Clínicas da Faculdade de Medicina da USP, HCFMUSP, São Paulo, SP, Brazil.
| | - R L Dutra
- Laboratorio de Citogenômica, Departamento de Patologia, Faculdade de Medicina da USP, FMUSP, São Paulo, SP, Brazil
| | - R S Honjo
- Unidade de Genética, Departamento de Pediatria, Instituto da Criança, Hospital das Clínicas da Faculdade de Medicina da USP, HCFMUSP, São Paulo, SP, Brazil
| | - J C Llerena
- Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira - Fiocruz, Rio de Janeiro, RJ, Brazil
| | - A X Acosta
- Universidade Federal da Bahia, Salvador, BA, Brazil
| | - P F V Medeiros
- Universidade Federal de Campina Grande, Campina Grande, PB, Brazil
| | - M F Galera
- Universidade Federal do Mato Grosso, Cuiabá, MT, Brazil
| | - É A Zanardo
- Laboratorio de Citogenômica, Departamento de Patologia, Faculdade de Medicina da USP, FMUSP, São Paulo, SP, Brazil
| | - F B Piazzon
- Laboratorio de Citogenômica, Departamento de Patologia, Faculdade de Medicina da USP, FMUSP, São Paulo, SP, Brazil
| | - A T Dias
- Laboratorio de Citogenômica, Departamento de Patologia, Faculdade de Medicina da USP, FMUSP, São Paulo, SP, Brazil
| | - G M Novo-Filho
- Laboratorio de Citogenômica, Departamento de Patologia, Faculdade de Medicina da USP, FMUSP, São Paulo, SP, Brazil
| | - M M Montenegro
- Laboratorio de Citogenômica, Departamento de Patologia, Faculdade de Medicina da USP, FMUSP, São Paulo, SP, Brazil
| | - F A R Madia
- Laboratorio de Citogenômica, Departamento de Patologia, Faculdade de Medicina da USP, FMUSP, São Paulo, SP, Brazil
| | - D R Bertola
- Unidade de Genética, Departamento de Pediatria, Instituto da Criança, Hospital das Clínicas da Faculdade de Medicina da USP, HCFMUSP, São Paulo, SP, Brazil.,Centro de Pesquisa sobre o Genoma Humano e Células-Tronco, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil., São Paulo, SP, Brazil
| | - J B de Melo
- Laboratório de Citogenética e Genómica - Faculdade de Medicina, Universidade de Coimbra, CIMAGO - Centro de Investigação em Meio Ambiente, Genética e Oncobiologia, Faculdade de Medicina, Universidade de Coimbra, Faculdade de Medicina, Universidade de Coimbra, CNC, IBILI - Faculdade de Medicina, Universidade de Coimbra, Coimbra, Portugal
| | - L D Kulikowski
- Laboratorio de Citogenômica, Departamento de Patologia, Faculdade de Medicina da USP, FMUSP, São Paulo, SP, Brazil
| | - C A Kim
- Unidade de Genética, Departamento de Pediatria, Instituto da Criança, Hospital das Clínicas da Faculdade de Medicina da USP, HCFMUSP, São Paulo, SP, Brazil
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Azeka E, Jatene MB, Jatene IB, Horowitz ESK, Branco KC, Souza Neto JD, Miura N, Mattos S, Afiune JY, Tanaka AC, Santos CCL, Guimarães ICB, Manso PH, Pellizari RCRS, Santos MVC, Thomaz AM, Cristofani LM, Ribeiro ACL, Kulikowski LD, Sampaio MC, Pereira AC, Soares A, Soares Junior J, Oh GHY, Moreira V, Mota CCC, Afiune CMC, Pedra C, Pedra S, Pedrosa A, Guimarães V, Caneo LF, Ferreiro CF, Cavalheiro Filho C, Stefanello B, Negrão CE, Turquetto ALR, Mesquita SMF, Maeda WF, Zorzanelli L, Panajotopolos N, Siqueira AWS, Galas FRB, Hajjar LA, Benvenuti LA, Vincenzi P, Odone V, Lopes MH, Strabelli TMV, Franchi SM, Takeuti AD, Duarte MF, Leon RGP, Hermida RPM, Sorpreso ICE, Soares Junior JM, Melo NR, Baracat EC, Bortolotto MRFL, Scanavacca M, Shimoda MS, Foronda G, Romano BW, Silva DB, Omura MM, Barbeiro CPM, Vinhole ARG, Palomo JSH, Gonçalves MAB, Reis ICF, Oliveira LG, Ribeiro CC, Isosaki M, Vieira LP, Feltrim MIZ, Manoel LA, Abud KCO, Paschotto DR, Neves ILI, Senaha LE, Garcia ACCN, Cipriano SL, Santos VC, Ferraz AS, Moreira AELC, De Paulo ARSA, Duque AMPC, Trindade E, Bacal F, Auler Junior JOC, Almeida DR. [I Guidelines of heart failure and heart transplantation in the fetus, in children and adults with congenital cardiopathy, The Brazilian Society of Cardiology]. Arq Bras Cardiol 2015; 103:1-126. [PMID: 25591041 DOI: 10.5935/abc.2014s005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Guilherme RS, Dutra ARN, Perez ABA, Takeno SS, Oliveira MM, Kulikowski LD, Klein E, Hamid AB, Liehr T, Melaragno MI. First report of a small supernumerary der(8;14) marker chromosome. Cytogenet Genome Res 2013; 139:284-8. [PMID: 23548553 DOI: 10.1159/000348743] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2012] [Indexed: 11/19/2022] Open
Abstract
Small supernumerary marker chromosomes (sSMC) are structurally abnormal chromosomes, generally equal in size or smaller than a chromosome 20 of the same metaphase spread. Most of them are unexpectedly detected in routine karyotype analyses, and it is usually not easy to correlate them with a specific clinical picture. A small group of sSMCs is derived from more than one chromosome, called complex sSMCs. Here, we report on a patient with a de novo complex sSMC, derived from chromosomes 8 and 14. Banding karyotype analysis, multiplex ligation-dependent probe amplification (MLPA), single nucleotide polymorphism (SNP)-based array, and fluorescence in situ hybridization (FISH) were performed to investigate its origin. Array and FISH analyses revealed a der(14)t(8;14)(p23.2;q22.1)dn. The propositus presents some clinical features commonly found in patients with partial duplication or triplication of 8p and 14q. This is the first report describing a patient with a congenital der(14)t(8;14)(p23.2;q22.1)dn sSMC.
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Affiliation(s)
- R S Guilherme
- Department of Morphology and Genetics, Universidade Federal de São Paulo, São Paulo, Brazil
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Belangero SI, Pacanaro ANX, Bellucco FT, Christofolini DM, Kulikowski LD, Guilherme RS, Bortolai A, Dutra ARN, Piazzon FB, Cernach MC, Melaragno MI. Wide clinical variability in cat eye syndrome patients: four non-related patients and three patients from the same family. Cytogenet Genome Res 2012; 138:5-10. [PMID: 22890013 DOI: 10.1159/000341570] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/21/2012] [Indexed: 11/19/2022] Open
Abstract
A small supernumerary marker chromosome (sSMC) derived from chromosome 22 is a relatively common cytogenetic finding. This sSMC typically results in tetrasomy for a chromosomal region that spans the chromosome 22p arm and the proximal 2 Mb of 22q11.21. Using classical cytogenetics, fluorescence in situ hybridization, multiplex ligation-dependent probe amplification, and array techniques, 7 patients with sSMCs derived from chromosome 22 were studied: 4 non-related and 3 from the same family (mother, daughter, and son). The sSMCs in all patients were dicentric and bisatellited chromosomes with breakpoints in the chromosome 22 low-copy repeat A region, resulting in cat eye syndrome (CES) due to chromosome 22 partial tetrasomy 22pter→q11.2 including the cat eye chromosome region. Although all subjects presented the same chromosomal abnormality, they showed a wide range of phenotypic differences, even in the 3 patients from the same family. There are no previous reports of CES occurring within 3 patients in the same family. Thus, the clinical and follow-up data presented here contribute to a better delineation of the phenotypes and outcomes of CES patients and will be useful for genetic counseling.
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Affiliation(s)
- S I Belangero
- Department of Morphology and Genetics, Universidade Federal de São Paulo, São Paulo, Brazil
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Noronha Dutra AR, Mancini TI, Satomi Takeno S, Moysés Oliveira M, Kim CA, Alvarez Perez AB, Domenici Kulikowski L, Melaragno MI. Different conformation of two supernumerary 18p isochromosomes, one with a concomitant partial 18q trisomy. Cytogenet Genome Res 2012; 138:1-4. [PMID: 22796746 DOI: 10.1159/000339566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/30/2012] [Indexed: 11/19/2022] Open
Abstract
The presence of a supernumerary 18p isochromosome is a rare chromosomal abnormality that results in 18p tetrasomy. This is a report on the clinical, cytogenetic and molecular findings of 2 non-related patients with a supernumerary 18p isochromosome. Both patients present some features of the 18p tetrasomy syndrome (strabismus, low-set ears, long and narrow fingers and toes), but additional characteristics were also observed. Cytogenetic analysis, FISH, MLPA and SNP array techniques showed that one of the isochromosomes is symmetric and monocentric, while the other is asymmetric and dicentric, yet resulting in a similar tetrasomy of the 18pter-18p10 region, followed by a partial 18q11.2 trisomy, an unprecedented finding in the literature.
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Affiliation(s)
- A R Noronha Dutra
- Disciplina de Genética, Departamento de Morfologia e Genética, Universidade de São Paulo, São Paulo, Brasil
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Guilherme RS, Bragagnolo S, Pellegrino R, Christofolini DM, Takeno SS, Carvolheira GM, Kulikowski LD, Melaragno MI. Clinical, cytogenetic and molecular study in a case of r(3) with 3p deletion and review of the literature. Cytogenet Genome Res 2011; 134:325-30. [PMID: 21849783 DOI: 10.1159/000329478] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/03/2011] [Indexed: 11/19/2022] Open
Abstract
Ring chromosome 3 is a rare abnormality with only 10 patients described in the literature. We report a patient with r(3) and ∼6-Mb distal 3p deletion. Single nucleotide polymorphism array, multiplex ligation-dependent probe amplification and fluorescence in situ hybridization techniques revealed that the ring was formed by a break in 3p26.1 and fusion with the subtelomeric region of 3q. The patient presents delayed psychomotor development, growth failure, minor anomalies and other features similar to patients with 3p monosomy. The analysis of 300 metaphase cells using G-banding and fluorescence in situ hybridization with centromeric probe revealed ring instability resulting in cells with secondary aberrations and with ring loss that could also be related to some phenotypic characteristics such as growth delay. This is the first patient with r(3) studied using molecular techniques that determined the exact breakpoints in order to establish a better karyotype-phenotype correlation.
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Affiliation(s)
- R Santos Guilherme
- Department of Morphology and Genetics, Universidade Federal de São Paulo, Brazil
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Christofolini DM, de Paula Ramos MA, Kulikowski LD, da Silva Bellucco FT, Belangero SIN, Brunoni D, Melaragno MI. Subtelomeric rearrangements and copy number variations in people with intellectual disabilities. J Intellect Disabil Res 2010; 54:938-942. [PMID: 20807304 DOI: 10.1111/j.1365-2788.2010.01325.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
BACKGROUND The most prevalent type of structural variation in the human genome is represented by copy number variations that can affect transcription levels, sequence, structure and function of genes. METHOD In the present study, we used the multiplex ligation-dependent probe amplification (MLPA) technique and quantitative PCR for the detection of copy number variation in 132 intellectually disabled male patients with normal karyotypes and negative fragile-X-testing. RESULTS Ten of these patients (7.6%) showed copy number variation in the subtelomeric regions, including deletions and duplications. DISCUSSION Duplications of the SECTM1 gene, located at 17q25.3, and of the FLJ22115 gene, located at 20p13, could be associated with phenotype alterations. This study highlights the relevance in the aetiology of intellectual disability of subtelomeric rearrangements that can be screened by MLPA and other molecular techniques.
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Affiliation(s)
- D M Christofolini
- Morphology and Genetics Department, Universidade Federal de São Paulo, São Paulo, SP, Brazil
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Sodré CP, Guilherme RS, Meloni VFA, Brunoni D, Juliano Y, Andrade JAD, Belangero SIN, Christofolini DM, Kulikowski LD, Melaragno MI. Ring chromosome instability evaluation in six patients with autosomal rings. Genet Mol Res 2010; 9:134-43. [PMID: 20198569 DOI: 10.4238/vol9-1gmr707] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Ring chromosomes are often associated with abnormal phenotypes due to loss of genomic material and also because of ring instability at mitosis after sister chromatid exchange events. We investigated ring chromosome instability in six patients with ring chromosomes 4, 14, 15, and 18 by examining 48- and 72-h lymphocyte cultures at the first, second and subsequent cell divisions after bromodeoxyuridine incorporation. Although most cells from all patients showed only one monocentric ring chromosome, ring chromosome loss and secondary aberrations were observed both in 48- and 72-h lymphocyte cultures and in metaphase cells of the different cell generations. We found no clear-cut correlation between ring size and ring instability; we also did not find differences between apparently complete rings and rings with genetic material loss. The cytogenetic findings revealed secondary aberrations in all ring chromosome patients. We concluded that cells with ring chromosome instability can multiply and survive in vivo, and that they can influence the patient's phenotype.
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Affiliation(s)
- C P Sodré
- Departamento de Morfologia e Genética da Universidade Federal de São Paulo, São Paulo, SP, Brasil
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