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Fussiger H, Pereira BLDS, Padilha JPD, Donis KC, Siebert M, Brusius-Facchin AC, Baldo G, Saute JAM, Chen K, Virmond LA, Silva MFB, Minillo RM, Almeida TF, Pelegrino KO, Ferreira AFM, Colichio GBC, Oliveira APA, Teixeira ACB, Carlos CD, da Matta MC, Lima MM, Yamada RY, Cintra VP, Campilongo GP, Camargo SK, Oliveira TFG, Coelho AVC, de Albuquerque RS, de Souza EA, Júnior MAP, Caraciolo MP, Cervato MC, Gomes CS, Moura LMS, Guedes RLM, Barreiro RAS, Reis RS, Val FC, Oliveira JB, Siebert M, Brusius‐Facchin AC, Baldo G, Saute JAM. Copy number variations in SPAST and ATL1 are rare among Brazilians. Clin Genet 2022; 103:580-584. [PMID: 36537231 DOI: 10.1111/cge.14280] [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: 11/09/2022] [Revised: 12/08/2022] [Accepted: 12/10/2022] [Indexed: 12/24/2022]
Abstract
Copy number variations (CNV) may represent a significant proportion of SPG4 and SPG3A diagnosis, the most frequent autosomal dominant subtypes of hereditary spastic paraplegias (HSP). We aimed to assess the frequency of CNVs in SPAST and ATL1 and to update the molecular epidemiology of HSP families in southern Brazil. A cohort study that included 95 Brazilian index cases with clinical suspicion of HSP was conducted between April 2011 and September 2022. Multiplex Ligation Dependent Probe Amplification (MLPA) was performed in 41 cases without defined diagnosis by different massive parallel sequencing techniques (MPS). Diagnosis was obtained in 57/95 (60%) index cases, 15/57 (26.3%) being SPG4. Most frequent autosomal recessive HSP subtypes were SPG7 followed by SPG11, SPG76 and cerebrotendinous xanthomatosis. No CNVs in SPAST and ATL1 were found. Copy number variations are rare among SPG4 and SPG3A families in Brazil. Considering the possibility of CNVs detection by specific algorithms with MPS data, we consider that this is likely the most cost-effective approach to investigate CNVs in these genes in low-risk populations, with MLPA being reserved as an orthogonal confirmatory test.
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Affiliation(s)
- Helena Fussiger
- Graduate Program in Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Janice Pacheco Dias Padilha
- Graduate Program in Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Karina Carvalho Donis
- Medical Genetics Service, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Brazil
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- Hospital Israelita Albert Einstein, São Paulo, Brazil
| | - Marina Siebert
- Laboratory Research Unit, Experimental Research Center, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Brazil
| | | | - Guilherme Baldo
- Graduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Jonas Alex Morales Saute
- Graduate Program in Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Medical Genetics Service, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Brazil.,Department of Internal Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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- Laboratory Research Unit, Experimental Research Center, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre Brazil
| | | | - Guilherme Baldo
- Graduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul Porto Alegre Brazil
| | - Jonas Alex Morales Saute
- Graduate Program in Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul Porto Alegre Brazil
- Medical Genetics Service, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre Brazil
- Department of Internal Medicine Universidade Federal do Rio Grande do Sul Porto Alegre Brazil
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Santiago KM, Castro LP, Neto JPD, de Nóbrega AF, Pinto CAL, Ashton-Prolla P, Pinto E Vairo F, de Medeiros PFV, Ribeiro EM, Ribeiro BFR, do Valle FF, Doriqui MJR, Leite CHB, Rocha RM, Moura LMS, Munford V, Galante PAF, Menck CFM, Rogatto SR, Achatz MI. Comprehensive germline mutation analysis and clinical profile in a large cohort of Brazilian xeroderma pigmentosum patients. J Eur Acad Dermatol Venereol 2020; 34:2392-2401. [PMID: 32239545 DOI: 10.1111/jdv.16405] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 03/05/2020] [Indexed: 12/21/2022]
Abstract
BACKGROUND Xeroderma pigmentosum (XP) patients present a high risk of developing skin cancer and other complications at an early age. This disease is characterized by mutations in the genes related to the DNA repair system. OBJECTIVES To describe the clinical and molecular findings in a cohort of 32 Brazilian individuals who received a clinical diagnosis of XP. METHODS Twenty-seven families were screened for germline variants in eight XP-related genes. RESULTS All patients (N = 32) were diagnosed with bi-allelic germline pathogenic or potentially pathogenic variants, including nine variants previously undescribed. The c.2251-1G>C XPC pathogenic variant, reported as the founder mutation in Comorian and Pakistani patients, was observed in 15 cases in homozygous or compound heterozygous. Seven homozygous patients for POLH/XPV variants developed their symptoms by an average age of 7.7 years. ERCC2/XPD, DDB2/XPE and ERCC5/XPG variants were found in a few patients. Aside from melanoma and non-melanoma skin tumours, a set of patients developed skin sebaceous carcinoma, leiomyosarcoma, angiosarcoma, mucoepidermoid carcinoma, gastric adenocarcinoma and serous ovarian carcinoma. CONCLUSIONS We reported a high frequency of XPC variants in 32 XP Brazilian patients. Nine new variants in XP-related genes, unexpected non-skin cancer lesions and an anticipation of the clinical manifestation in POLH/XPV cases were also described.
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Affiliation(s)
- K M Santiago
- Department of Oncogenetics, A.C.Camargo Cancer Center, São Paulo, São Paulo, Brazil.,International Research Center (CIPE), A.C.Camargo Cancer Center, São Paulo, São Paulo, Brazil
| | - L P Castro
- Department of Microbiology, Institute of Biomedical Sciences, University of Sao Paulo, São Paulo, São Paulo, Brazil
| | - J P D Neto
- Department of Skin Cancer, A.C.Camargo Cancer Center, São Paulo, São Paulo, Brazil
| | - A F de Nóbrega
- Department of Oncogenetics, A.C.Camargo Cancer Center, São Paulo, São Paulo, Brazil.,International Research Center (CIPE), A.C.Camargo Cancer Center, São Paulo, São Paulo, Brazil
| | - C A L Pinto
- Department of Pathology, A.C.Camargo Cancer Center, São Paulo, São Paulo, Brazil
| | - P Ashton-Prolla
- Medical Genetics Service, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil.,Department of Genetics, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - F Pinto E Vairo
- Center for Individualized Medicine and Department of Clinical Genomics, Mayo Clinic, Rochester, MN, USA
| | - P F V de Medeiros
- University Hospital Alcides Carneiro, Federal University of Campina Grande, Campina Grande, Paraíba, Brazil
| | - E M Ribeiro
- Associação Cearense de Doenças Genéticas, Fortaleza, Ceará, Brazil
| | - B F R Ribeiro
- Children's Hospital, Secretaria de Estado de Saúde do Acre, Rio Branco, Acre, Brazil
| | - F F do Valle
- Amazonas Federal University, Manaus, Amazonas, Brazil
| | - M J R Doriqui
- Hospital Infantil Dr Juvêncio Mattos, São Luís, Maranhão, Brazil
| | - C H B Leite
- Department of Radiation Oncology, Instituto do Câncer do Ceará, Fortaleza, Ceará, Brazil
| | - R M Rocha
- Gynecology Department, Paulista Medicine School, Federal University of São Paulo (UNIFESP), São Paulo, São Paulo, Brazil
| | - L M S Moura
- Department of Microbiology, Institute of Biomedical Sciences, University of Sao Paulo, São Paulo, São Paulo, Brazil
| | - V Munford
- Department of Microbiology, Institute of Biomedical Sciences, University of Sao Paulo, São Paulo, São Paulo, Brazil
| | - P A F Galante
- Molecular Oncology Center, Hospital Sírio-Libanês, São Paulo, São Paulo, Brazil
| | - C F M Menck
- Department of Microbiology, Institute of Biomedical Sciences, University of Sao Paulo, São Paulo, São Paulo, Brazil
| | - S R Rogatto
- Department of Clinical Genetics, University Hospital, Institute of Regional Health Research, University of Southern Denmark, Vejle, Denmark
| | - M I Achatz
- Centro de Oncologia, Hospital Sírio-Libanês, São Paulo, São Paulo, Brazil
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Munford V, Castro LP, Souto R, Lerner LK, Vilar JB, Quayle C, Asif H, Schuch AP, de Souza TA, Ienne S, Alves FIA, Moura LMS, Galante PAF, Camargo AA, Liboredo R, Pena SDJ, Sarasin A, Chaibub SC, Menck CFM. A genetic cluster of patients with variant xeroderma pigmentosum with two different founder mutations. Br J Dermatol 2017; 176:1270-1278. [PMID: 27664908 DOI: 10.1111/bjd.15084] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/19/2016] [Indexed: 01/04/2023]
Abstract
BACKGROUND Xeroderma pigmentosum (XP) is a rare human syndrome associated with hypersensitivity to sunlight and a high frequency of skin tumours at an early age. We identified a community in the state of Goias (central Brazil), a sunny and tropical region, with a high incidence of XP (17 patients among approximately 1000 inhabitants). OBJECTIVES To identify gene mutations in the affected community and map the distribution of the affected alleles, correlating the mutations with clinical phenotypes. METHODS Functional analyses of DNA repair capacity and cell-cycle responses after ultraviolet exposure were investigated in cells from local patients with XP, allowing the identification of the mutated gene, which was then sequenced to locate the mutations. A specific assay was designed for mapping the distribution of these mutations in the community. RESULTS Skin primary fibroblasts showed normal DNA damage removal but abnormal DNA synthesis after ultraviolet irradiation and deficient expression of the Polη protein, which is encoded by POLH. We detected two different POLH mutations: one at the splice donor site of intron 6 (c.764 +1 G>A), and the other in exon 8 (c.907 C>T, p.Arg303X). The mutation at intron 6 is novel, whereas the mutation at exon 8 has been previously described in Europe. Thus, these mutations were likely brought to the community long ago, suggesting two founder effects for this rare disease. CONCLUSIONS This work describes a genetic cluster involving POLH, and, particularly unexpected, with two independent founder mutations, including one that likely originated in Europe.
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Affiliation(s)
- V Munford
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - L P Castro
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - R Souto
- Secretariat of Health, Goiania, GO, Brazil
| | - L K Lerner
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - J B Vilar
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - C Quayle
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - H Asif
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - A P Schuch
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil.,Department of Biochemistry and Molecular Biology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - T A de Souza
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - S Ienne
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - F I A Alves
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - L M S Moura
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - P A F Galante
- Molecular Oncology Center, Hospital Sírio-Libanês, São Paulo, SP, Brazil
| | - A A Camargo
- Molecular Oncology Center, Hospital Sírio-Libanês, São Paulo, SP, Brazil
| | - R Liboredo
- Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - S D J Pena
- Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - A Sarasin
- UMR 8200 CNRS, Institut Gustave Roussy and University Paris-Saclay, Villejuif, France
| | - S C Chaibub
- General Hospital of Goiania, Goiania, GO, Brazil
| | - C F M Menck
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
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Dulgheroff ACB, Figueiredo EF, Moreira LP, Moreira KC, Moura LMS, Gouvêa VS, Domingues ALS. Distribution of rotavirus genotypes after vaccine introduction in the Triângulo Mineiro region of Brazil: 4-Year follow-up study. J Clin Virol 2012; 55:67-71. [PMID: 22795600 DOI: 10.1016/j.jcv.2012.06.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 06/09/2012] [Accepted: 06/11/2012] [Indexed: 11/17/2022]
Abstract
BACKGROUND Rotaviruses are the major cause of diarrhea in children for which a monovalent G1P[8] vaccine has been provided free for all Brazilian infants since March 2006. OBJECTIVES To investigate prevalence and genotypes of rotavirus strains causing diarrhea in children in Triângulo Mineiro, Minas Gerais, during 2007-2010, and to assess local vaccine impact. STUDY DESIGN Fecal specimens were analyzed for rotavirus detection and characterization by PAGE, RT-PCR and PCR-genotyping assays. RESULTS Overall, rotavirus was diagnosed in 12.1% (76/630) cases, accounting for 35.8% of the hospitalizations and 6.5% of outpatient attendance due to diarrhea. A trend in rotavirus disease reduction occurred in both cities (71.8% and 83.4% in Uberaba; 95.3% in Uberlândia) up to 2009, but it reversed in 2010 with increased rotavirus cases in Uberlândia. Short pattern G2P[4] strains were detected in all but three (96%) cases of mixed/P[NT] infections with long electropherotypes. CONCLUSIONS This 4-year follow-up study showed a reduction in rotavirus-related diarrhea and even skipped a rotavirus season, which is consistent with vaccine mediated protection. The 2007-2010 rotavirus epidemic curve reflected the natural cyclic fluctuation of the single G2P[4] genotype, with sharp reduction of cases in 2008 leading to lack of a rotavirus 2009 season (both cases and hospitalizations) followed by its come back in 2010. Diarrhea cases related to either vaccine serotype/genotype (G1 or P[8]) were not detected. Thus, a new scenario emerged with a single epidemic genotype replacing the cocirculation of great diversity of genotypes, thus far, a hallmark of the epidemiology of rotavirus in Brazil.
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Affiliation(s)
- A C B Dulgheroff
- Instituto de Ciências Biológicas e Naturais, Microbiologia, Universidade Federal do Triângulo Mineiro, Uberaba, Minas Gerais, Brazil
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