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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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Kubaski F, Herbst ZM, Burin MG, Michelin‐Tirelli K, Trapp FB, Gus R, Netto ABO, Brusius‐Facchin AC, Leistner‐Segal S, Sanseverino MT, Souza CMFD, Wilke MVMB, Oliveira T, Magalhães JAA, Giugliani R. Measurement of sulfatides in the amniotic fluid supernatant: A useful tool in the prenatal diagnosis of metachromatic leukodystrophy. JIMD Rep 2022; 63:162-167. [PMID: 35281662 PMCID: PMC8898714 DOI: 10.1002/jmd2.12270] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 12/17/2021] [Accepted: 12/23/2021] [Indexed: 12/02/2022] Open
Abstract
Metachromatic leukodystrophy (MLD) is an autosomal recessive lysosomal disorder caused by deficiency of arylsulfatase A (ARSA), leading to an accumulation of sulfatides. Sulfatides have been quantified in urine, dried blood spots (DBS), and tissues of patients with MLD. Newborn screening (NBS) for MLD has already been proposed based on a two‐tier approach with the quantification of sulfatides in DBS followed by the quantification of ARSA by liquid chromatography–tandem mass spectrometry (LC–MS/MS). Prenatal screening for MLD is also crucial, and sulfatide quantification in amniotic fluid (AF) can aid diagnosis. The prenatal study was initiated due to a family history of MLD at 19 weeks of gestation. ARSA was quantified in cultured amniocytes. C16:0 sulfatide was quantified by LC‐MS/MS in the supernatant of AF. Molecular analysis of the ARSA gene was performed in cultured amniocytes. ARSA was deficient in fetal cells, and C16:0 sulfatides were significantly elevated in comparison to age‐matched controls (3‐fold higher). Genetic studies identified the c.465+1G>A variant in homozygosis in the ARSA gene. Our study shows that sulfatides can be quantified in the supernatant of AF of MLD fetuses, and it could potentially aid in a faster and more accurate diagnosis of MLD patients.
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Affiliation(s)
- Francyne Kubaski
- PPGBM UFRGS Porto Alegre Brazil
- Medical Genetics Service HCPA Porto Alegre Brazil
- INAGEMP Porto Alegre Brazil
| | - Zackary M. Herbst
- Department of Chemistry University of Washington Seattle Washington USA
| | | | | | | | - Rejane Gus
- Medical Genetics Service HCPA Porto Alegre Brazil
| | - Alice B. O. Netto
- PPGBM UFRGS Porto Alegre Brazil
- Medical Genetics Service HCPA Porto Alegre Brazil
| | | | | | | | | | | | | | | | - Roberto Giugliani
- PPGBM UFRGS Porto Alegre Brazil
- Medical Genetics Service HCPA Porto Alegre Brazil
- INAGEMP Porto Alegre Brazil
- PPGCM UFRGS Porto Alegre Brazil
- Department of Genetics UFRGS Porto Alegre Brazil
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Giugliani L, Steiner CE, Kim CA, Lourenço CM, Santos MLSF, de Souza CFM, Brusius‐Facchin AC, Baldo G, Riegel M, Giugliani R. Clinical findings in Brazilian patients with adult GM1 gangliosidosis. JIMD Rep 2019; 49:96-106. [PMID: 31497487 PMCID: PMC6718113 DOI: 10.1002/jmd2.12067] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 06/12/2019] [Accepted: 06/24/2019] [Indexed: 11/20/2022] Open
Abstract
GM1 gangliosidosis is a lysosomal storage disorder caused by β-galactosidase deficiency. To date, prospective studies for GM1 gangliosidosis are not available, and only a few have focused on the adult form. This retrospective cross-sectional study focused on clinical findings in Brazilian patients with the adult form of GM1 gangliosidosis collected over 2 years. Ten subjects were included in the study. Eight were males and two females, with median age at diagnosis of 11.5 years (IQR, 4-34 years). Short stature and weight below normal were seen in five out of the six patients with data available. Radiological findings revealed that the most frequent skeletal abnormalities were beaked vertebrae, followed by hip dysplasia, and platyspondyly. Neurological examination revealed that dystonia and swallowing problems were the most frequently reported. None of the patients presented hyperkinesia, truncal hypertonia, Parkinsonism, or spinal cord compression. Clinical evaluation revealed impairment in activities of cognitive/intellectual development and behavioral/psychiatric disorders in all nine subjects with data available. Language/speech impairment (dysarthria) was found in 8/9 patients, fine motor and gross motor impairments were reported in 7/9 and 5/9 patients, respectively. Impairment of cognition and daily life activities were seen in 7/9 individuals. Our findings failed to clearly identify typical early or late alterations presented in GM1 gangliosidosis patients, which confirms that it is a very heterogeneous condition with wide phenotypic variability. This should be taken into account in the evaluation of future therapies for this challenging condition.
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Affiliation(s)
- Luciana Giugliani
- National Institute of Population Medical Genetics (INAGEMP)Porto AlegreBrazil
| | | | - Chong Ae Kim
- Instituto da CriançaHospital das Clínicas, FM, USPSão PauloBrazil
| | | | | | | | | | - Guilherme Baldo
- Gene Therapy Center, HCPAPorto AlegreBrazil
- Department of PhysiologyUFRGSPorto AlegreBrazil
- Post‐Graduate Program in PhysiologyUFRGSPorto AlegreBrazil
| | - Mariluce Riegel
- Medical Genetics Service, HCPAPorto AlegreBrazil
- Post‐Graduate Program in Genetics and Molecular BiologyUFRGSPorto AlegreBrazil
| | - Roberto Giugliani
- National Institute of Population Medical Genetics (INAGEMP)Porto AlegreBrazil
- Medical Genetics Service, HCPAPorto AlegreBrazil
- Post‐Graduate Program in Genetics and Molecular BiologyUFRGSPorto AlegreBrazil
- Department of GeneticsUFRGSPorto AlegreBrazil
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