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Rispoli T, Martins de Castro S, Grandi T, Prado M, Filippon L, Dornelles da Silva CM, Vargas JE, Rossetti LMR. A Low-Cost and Simple Genetic Screening for Cystic Fibrosis Provided by the Brazilian Public Health System. J Pediatr 2018; 199:272-277.e3. [PMID: 29731357 DOI: 10.1016/j.jpeds.2018.03.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 03/14/2018] [Accepted: 03/19/2018] [Indexed: 12/11/2022]
Abstract
Cystic fibrosis newborn screening was implemented in Brazil by the Public Health System in 2012. Because of cost, only 1 mutation was tested - p.Phe508del. We developed a robust low-cost genetic test for screening 11 CFTR gene mutations with potential use in developing countries.
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Affiliation(s)
- Thaiane Rispoli
- Programa de Pós-Graduação em Biologia Celular e Molecular (PPGBCM), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil; Centro de Desenvolvimento Científico e Tecnológico (CDCT), Departamento de Ações em Saúde (DAS), Secretaria da Saúde do Estado do Rio Grande do Sul (SES-RS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Simone Martins de Castro
- Serviço de Referência em Triagem Neonatal, Hospital Materno Infantil Presidente Vargas (HMIPV), Porto Alegre, Rio Grande do Sul, Brazil; Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Tarciana Grandi
- Centro de Desenvolvimento Científico e Tecnológico (CDCT), Departamento de Ações em Saúde (DAS), Secretaria da Saúde do Estado do Rio Grande do Sul (SES-RS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Mayara Prado
- Programa de Pós-Graduação em Biologia Celular e Molecular (PPGBCM), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil; Centro de Desenvolvimento Científico e Tecnológico (CDCT), Departamento de Ações em Saúde (DAS), Secretaria da Saúde do Estado do Rio Grande do Sul (SES-RS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Letícia Filippon
- Serviço de Referência em Triagem Neonatal, Hospital Materno Infantil Presidente Vargas (HMIPV), Porto Alegre, Rio Grande do Sul, Brazil
| | - Cláudia Maria Dornelles da Silva
- Centro de Desenvolvimento Científico e Tecnológico (CDCT), Departamento de Ações em Saúde (DAS), Secretaria da Saúde do Estado do Rio Grande do Sul (SES-RS), Porto Alegre, Rio Grande do Sul, Brazil
| | - José Eduardo Vargas
- Instituto de Ciências Biológicas, Universidade de Passo Fundo (UPF), Passo Fundo, Rio Grande do Sul, Brazil.
| | - Lucia Maria Rosa Rossetti
- Programa de Pós-Graduação em Biologia Celular e Molecular (PPGBCM), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil; Centro de Desenvolvimento Científico e Tecnológico (CDCT), Departamento de Ações em Saúde (DAS), Secretaria da Saúde do Estado do Rio Grande do Sul (SES-RS), Porto Alegre, Rio Grande do Sul, Brazil; Universidade Luterana do Brasil (ULBRA), Canoas, Rio Grande do Sul, Brazil
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Abstract
Identifying mutations that cause cystic fibrosis (CF) is important for making an early, unambiguous diagnosis, which, in turn, is linked to better health and a greater life expectancy. In patients of African descent, a molecular diagnosis is often confounded by the fact that the majority of investigations undertaken to identify causative mutations have been conducted on European populations, and CF-causing mutations tend to be population specific. We undertook a survey of published data with the aim of identifying causative CF mutations in patients of African descent in the Americas. We found that 1,584 chromosomes had been tested in only 6 countries, of which 876 alleles (55.3%) still remained unidentified. There were 59 mutations identified. Of those, 41 have been shown to cause CF, 17 have no associated functional studies, and one (R117H) is of varying clinical consequence. The most common mutations identified in the patients of African descent were: ΔF508 (29.4% identified in the United States, Colombia, Brazil, and Venezuela); 3120 + 1G>A (8.4% identified in Brazil, the United States, and Colombia); G85E (3.8% identified in Brazil); 1811 + 1.6kbA>G (3.7% identified in Colombia); and 1342 - 1G>C (3.1% identified in the United States). The majority of the mutations identified (81.4%) have been described in just one country. Our findings indicate that there is a need to fully characterize the spectrum of CF mutations in the diaspora to improve diagnostic accuracy for these patients and facilitate treatment.
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Ribas D, Escaliante C, Bortoli C, de Oliveira C, Mikami L, Riedi C, Raskin S, Rosário Filho N, Pereira-Ferrari L. p.Phe508del
, p.Gly542X
, p.Arg1162X
, p.Asn1303Lys
, and p.Lys683serfsX38
mutations in CF newborn screening of Brazilian children. Clin Genet 2017; 92:115-116. [DOI: 10.1111/cge.12903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 10/20/2016] [Accepted: 10/20/2016] [Indexed: 11/30/2022]
Affiliation(s)
- D.I.R. Ribas
- Postgraduate Program in Internal Medicine and Health Sciences; Hospital de Clínicas, Universidade Federal do Paraná; Curitiba Brazil
- Centro Universitário Autônomo do Brasil - Escola de Saúde, UniBrasil; Curitiba Brazil
| | - C.H. Escaliante
- Centro Universitário Autônomo do Brasil - Escola de Saúde, UniBrasil; Curitiba Brazil
| | - C.G. Bortoli
- Postgraduate Program in Internal Medicine and Health Sciences; Hospital de Clínicas, Universidade Federal do Paraná; Curitiba Brazil
| | - C.R.F. de Oliveira
- Postgraduate Program in Internal Medicine and Health Sciences; Hospital de Clínicas, Universidade Federal do Paraná; Curitiba Brazil
- Centro Universitário Autônomo do Brasil - Escola de Saúde, UniBrasil; Curitiba Brazil
| | - L.R. Mikami
- Centro Universitário Autônomo do Brasil - Escola de Saúde, UniBrasil; Curitiba Brazil
| | - C.A. Riedi
- Department of Pediatrics; Universidade Federal do Paraná, Hospital de Clínicas; Curitiba Brazil
| | - S. Raskin
- Graduate Program in Health Sciences, School of Medicine School of Life Sciences; Pontifícia Universidade Católica do Paraná; Curitiba Brazil
| | - N.A. Rosário Filho
- Postgraduate Program in Internal Medicine and Health Sciences; Hospital de Clínicas, Universidade Federal do Paraná; Curitiba Brazil
- Department of Pediatrics; Universidade Federal do Paraná, Hospital de Clínicas; Curitiba Brazil
| | - L. Pereira-Ferrari
- Postgraduate Program in Internal Medicine and Health Sciences; Hospital de Clínicas, Universidade Federal do Paraná; Curitiba Brazil
- Centro Universitário Autônomo do Brasil - Escola de Saúde, UniBrasil; Curitiba Brazil
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de Souza DAS, Faucz FR, de Alexandre RB, Santana MA, de Souza ELS, Reis FJC, Pereira-Ferrari L, Sotomaior VS, Culpi L, Phillips JA, Raskin S. Cystic fibrosis in Afro-Brazilians: XK haplotypes analysis supports the European origin of p.F508del mutation. Genetica 2017; 145:19-25. [DOI: 10.1007/s10709-016-9942-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 11/30/2016] [Indexed: 10/20/2022]
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Tavares KO, Carvalho MDDB, Pelloso SM. Difficulties experienced by the mothers of people with cystic fibrosis. TEXTO & CONTEXTO ENFERMAGEM 2014. [DOI: 10.1590/0104-07072014000050013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study aimed to understand difficulties experienced by mothers in life with, and caring for, their children with cystic fibrosis. A descriptive-exploratory study with a qualitative character, its population consisted of 14 women. Data collection involved a semi-structured interview. The statements' analysis allowed the identification of two units of meaning: 'The treatment of cystic fibrosis: facing difficulties'; and 'The child's future: the difficult coexistence with the hope for a cure and a normal development'. Difficulties experienced by the mothers relate to disbelief regarding the diagnosis, the mourning for the loss of the dreamt-of child, acceptance of the inevitable and the struggle for the child's life and comfort. It is important for the health team to present another perspective on the health-illness process regarding chronic illnesses in order to support individuals affected and their families in the most efficacious and complete way.
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Dal'Maso VB, Mallmann L, Siebert M, Simon L, Saraiva-Pereira ML, Dalcin PDTR. Diagnostic contribution of molecular analysis of the cystic fibrosis transmembrane conductance regulator gene in patients suspected of having mild or atypical cystic fibrosis. J Bras Pneumol 2013; 39:181-9. [PMID: 23670503 PMCID: PMC4075816 DOI: 10.1590/s1806-37132013000200009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Accepted: 03/04/2013] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE: To evaluate the diagnostic contribution of molecular analysis of the cystic fibrosis transmembrane conductance regulator (CFTR) gene in patients suspected of having mild or atypical cystic fibrosis (CF). METHODS: This was a cross-sectional study involving adolescents and adults aged ≥ 14 years. Volunteers underwent clinical, laboratory, and radiological evaluation, as well as spirometry, sputum microbiology, liver ultrasound, sweat tests, and molecular analysis of the CFTR gene. We then divided the patients into three groups by the number of mutations identified (none, one, and two or more) and compared those groups in terms of their characteristics. RESULTS: We evaluated 37 patients with phenotypic findings of CF, with or without sweat test confirmation. The mean age of the patients was 32.5 ± 13.6 years, and females predominated (75.7%). The molecular analysis contributed to the definitive diagnosis of CF in 3 patients (8.1%), all of whom had at least two mutations. There were 7 patients (18.9%) with only one mutation and 26 patients (70.3%) with no mutations. None of the clinical characteristics evaluated was found to be associated with the genetic diagnosis. The most common mutation was p.F508del, which was found in 5 patients. The combination of p.V232D and p.F508del was found in 2 patients. Other mutations identified were p.A559T, p.D1152H, p.T1057A, p.I148T, p.V754M, p.P1290P, p.R1066H, and p.T351S. CONCLUSIONS: The molecular analysis of the CFTR gene coding region showed a limited contribution to the diagnostic investigation of patients suspected of having mild or atypical CF. In addition, there were no associations between the clinical characteristics and the genetic diagnosis.
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Perone C, Medeiros GS, del Castillo DM, de Aguiar MJB, Januário JN. Frequency of 8 CFTR gene mutations in cystic fibrosis patients in Minas Gerais, Brazil, diagnosed by neonatal screening. Braz J Med Biol Res 2010; 43:134-8. [PMID: 20098842 DOI: 10.1590/s0100-879x2009007500035] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2009] [Accepted: 01/04/2010] [Indexed: 11/21/2022] Open
Abstract
The nature and frequency of cystic fibrosis mutations in Brazil is not uniform due to the highly varied ethnic composition of the population. The average frequency of the F508del mutation has been reported to be 48.6%. Other common mutations in Brazil are G542X, R1162X, and N1303K. The aim of this study was to analyze the frequency of 8 mutations (F508del, G542X, R1162X, N1303K, W1282X, G85E, 3120+1G>A, and 711+1G>T) in a sample of 111 newborn patients with cystic fibrosis diagnosed by the Cystic Fibrosis Neonatal Screening Program of Minas Gerais State. The mutations were tested by allele-specific oligonucleotide PCR with specially designed primers. An allele frequency of 48.2% was observed for the F508del mutation, and allele frequencies of 5.41, 4.50, 4.05, and 3.60% were found for the R1162X, G542X, 3120+1G>A, and G85E mutations, respectively. The genotypes obtained were in Hardy-Weinberg equilibrium. These data demonstrate that the 8-mutation panel studied here has extensive coverage (68%) for the cystic fibrosis mutations in Minas Gerais. These data improve our knowledge of cystic fibrosis in Brazil, particularly in this region. In addition, this investigation contributed to the establishment of a sensitive and population-specific mutation panel, which can be helpful for molecular diagnosis of cystic fibrosis.
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Affiliation(s)
- C Perone
- Núcleo de Ações e Pesquisa em Apoio Diagnóstico, Universidade Federal de Minas Gerais, Brasil.
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Faucz FR, Souza DAS, Olandoski M, Raskin S. CFTR allelic heterogeneity in Brazil: historical and geographical perspectives and implications for screening and counseling for cystic fibrosis in this country. J Hum Genet 2009; 55:71-6. [PMID: 19942933 DOI: 10.1038/jhg.2009.123] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The goal of the present study was to provide a complete and updated spectrum of cystic fibrosis (CF) transmembrane conductance regulator (CFTR) gene mutations in the Brazilian population combining all available in silico data for patients with CF in Brazil, including founder background and migration flow that consisted of the actual genetic pool of the Brazilian population. Information sources in international databases (PUBMED and SCIELO) were searched. The Brazilian population shows a wide variation in the frequency of CFTR mutations in states Rio Grande do Sul (RS), Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ), Minas Gerais (MG), Pará (PA) and Bahia (BA); this variation includes the most common mutation p.F508del. Apparently, this frequency variation is because of the different ethnic compositions. States such as SC and PR have a greater European admixture with almost 90% of CF alleles identified. In other states, such as BA, higher frequency of alleles that are common among African populations is seen. Overall, the CFTR mutational spectrum indicates the presence of European, African and Amerindian ethnic groups in the contemporary Brazilian CF patients. Here, we present an analysis of the CFTR allelic heterogeneity and discuss the origin of its genetic composition, in an attempt to provide improved perspective for the CF population screening in Brazil and genetic counseling.
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Affiliation(s)
- Fabio R Faucz
- Center for Health and Biological Sciences, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil.
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Rodrigues R, Magalhaes P, Fernandes M, Gabetta C, Ribeiro A, Pedro K, Valdetaro F, Santos J, Souza RD, Pazin Filho A, Maciel L. Neonatal screening for cystic fibrosis in São Paulo State, Brazil: a pilot study. Braz J Med Biol Res 2009; 42:973-8. [DOI: 10.1590/s0100-879x2009005000017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2008] [Accepted: 07/16/2009] [Indexed: 11/22/2022] Open
Affiliation(s)
| | | | | | | | | | - K.P. Pedro
- Associação de Pais e Amigos dos Excepcionais, Brasil
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Vidigal P, Reis F, Boson W, De Marco L, Brasileiro-Filho G. p.F508del in a heterogeneous cystic fibrosis population from Minas Gerais, Brazil. Braz J Med Biol Res 2008; 41:643-7. [DOI: 10.1590/s0100-879x2008000800001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2007] [Accepted: 06/09/2008] [Indexed: 11/22/2022] Open
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Faucz FR, Gimenez J, Ramos MD, Pereira-Ferrari L, Estivill X, Raskin S, Casals T, Culpi L. Cystic fibrosis in a southern Brazilian population: characteristics of 90% of the alleles. Clin Genet 2007; 72:218-23. [PMID: 17718859 DOI: 10.1111/j.1399-0004.2007.00854.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cystic fibrosis (CF) is a genetic disease that frequently leads to death in infancy among Europeans and their descendants. The goals of the present study were to analyze the molecular aspects of CFTR gene characterizing mutations, their frequencies, and the haplotypes formed by four CFTR gene intragenic markers, IVS8-6(T)n, IVS8CA, IVS17bTA and IVS17bCA, in a southern Brazilian population of Caucasian origin. DNA samples from 56 non-related CF patients were analyzed using scanning techniques (single strand conformation polymorphism and denaturing gradient gel electrophoresis), restriction fragment length polymorphism and direct DNA sequencing to identify the mutations. Our results revealed a total of 25 different CF mutations representing nearly 90% of CF alleles, two being novel mutations. Microsatellite haplotypes were defined for CF and normal alleles. The mutational spectrum and the associated haplotypes described for the first time in this study should prove relevant for genetic counselling and CF population screening in Brazil. Moreover, our results suggest the presence of a major Mediterranean component in the contemporary Brazilian CF patient pool.
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Affiliation(s)
- F R Faucz
- Laboratory of Molecular Genetic, Department of Genetics, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil.
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Raskin S, Pereira-Ferrari L, Reis FC, Abreu F, Marostica P, Rozov T, Cardieri J, Ludwig N, Valentin L, Rosario-Filho NA, Camargo Neto E, Lewis E, Giugliani R, Diniz EMA, Culpi L, Phillip JA, Chakraborty R. Incidence of cystic fibrosis in five different states of Brazil as determined by screening of p.F508del, mutation at the CFTR gene in newborns and patients. J Cyst Fibros 2007; 7:15-22. [PMID: 17544945 DOI: 10.1016/j.jcf.2007.03.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2006] [Revised: 03/25/2007] [Accepted: 03/29/2007] [Indexed: 10/23/2022]
Abstract
Cystic Fibrosis (CF) is one of the most common single-gene defects in European descent populations with an incidence of about 1 in every 2500 live births and carrier frequency of approximately 1 in 25. The most common mutation at the CF transmembrane conductance regulator (CFTR) gene is a deletion (p.F508del) of the phenylalanine codon 508; its frequency, however, is not the same throughout the world. The purpose of this paper is to document an application of a two-tier survey design in different states of Brazil, from which regional differences of the incidence of CF and frequency of CF-causing mutation(s) carriers can be for the first time estimated. We present data on genotype distributions in reference to p.F508del mutation in samples of newborns, adult controls and CF patients from five Brazilian states, in which a total of 2683 newborns born to Brazilian white parents and 500 African-Brazilians adult controls were screened, as well as 300 CF patients (262 European descents and 38 African descents) were genotyped. Our results suggest that the CF-incidence in different parts of Brazil may differ by almost 20-fold. For the five different states as a whole, nearly 48% of the CF-alleles carry the p.F508del mutation, which places the estimates of disease incidence and carrier frequencies for the Brazilian European descents as 1 in 7576 live births and 2.3%, respectively. The implications for prevention of CF and other rare Mendelian diseases through such surveys of mutation screening are discussed.
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Affiliation(s)
- Salmo Raskin
- Pontificia Universidade Catolica do Parana, Brazil.
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Pérez MM, Luna MC, Pivetta OH, Keyeux G. CFTR gene analysis in Latin American CF patients: heterogeneous origin and distribution of mutations across the continent. J Cyst Fibros 2006; 6:194-208. [PMID: 16963320 DOI: 10.1016/j.jcf.2006.07.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2006] [Revised: 07/28/2006] [Accepted: 07/28/2006] [Indexed: 11/16/2022]
Abstract
BACKGROUND Cystic Fibrosis (CF) is the most prevalent Mendelian disorder in European populations. Despite the fact that many Latin American countries have a predominant population of European-descent, CF has remained an unknown entity until recently. Argentina and Brazil have detected the first patients around three decades ago, but in most countries this disease has remained poorly documented. Recently, other countries started publishing their results. METHODS We present a compilation and statistical analysis of the data obtained in 10 countries (Argentina, Brazil, Chile, Colombia, Costa Rica, Cuba, Ecuador, Mexico, Uruguay and Venezuela), with a total of 4354 unrelated CF chromosomes studied. RESULTS The results show a wide distribution of 89 different mutations, with a maximum coverage of 62.8% of CF chromosomes/alleles in the patient's sample. Most of these mutations are frequent in Spain, Italy, and Portugal, consistent with the origin of the European settlers. A few African mutations are also present in those countries which were part of the slave trade. New mutations were also found, possibly originating in America. CONCLUSION The profile of mutations in the CFTR gene, which reflects the heterogeneity of its inhabitants, shows the complexity of the molecular diagnosis of CF mutations in most of the Latin American countries.
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Affiliation(s)
- Martín M Pérez
- Centro Nacional de Genética Médica, ANLIS-Dr. Carlos G. Malbrán, Avenue Las Heras 2670, 4 Piso, 1425 Buenos Aires, Argentina
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Ferraroni NR, Geloneze B, Mansour E, Perroud AP, Muscelli EO, Tambascia M, de Lima Zollner R, Velloso LA. Severe hypoleptinaemia associated with insulin resistance in patients with common variable immunodeficiency. Clin Endocrinol (Oxf) 2005; 63:63-5. [PMID: 15963063 DOI: 10.1111/j.1365-2265.2005.02300.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Common variable immunodeficiency (CVI) is a primary immunodeficiency syndrome characterized by impaired production of antibodies and recurrent infections. Delay in diagnosis leads to metabolic wastage and low body weight. Leptin, a hormone produced by white adipose tissue, modulates insulin action by signal transduction cross-talk and by direct action on pancreatic beta-cells. We hypothesized that patients with CVI might present a defective regulation of leptin production and insulin resistance. PATIENTS Thirteen CVI patients (39 +/- 11 years) under gammaglobulin replacement were evaluated in parallel with 13 gender-, age-, body weight- and body mass index (BMI)-matched healthy voluntaries, and with data from two large population series, the Bruneck and the Hoorn Studies. MEASUREMENTS Serum leptin and insulin levels, homeostasis model assessment - insulin resistance (HOMA-IR), body composition, haematological, biochemical and immunoglobulin measurements were obtained. Data were analysed by a one-way analysis of variance (anova) and by Pearson's rank analysis. The institutional ethics committee approved the study, and informed consent was obtained from patients and controls. RESULTS No differences were found between CVI and the control group when comparing gender distribution, age, body weight, BMI, waist/hip ratio, relative body fat and fasting glucose levels. Leptin levels were lower (P < 0.05) in CVI patients than in controls and lower than fasting leptin levels detected in a large population study. CVI patients' serum leptin levels did not correlate with BMI (r = 0.074, P = 0.8) and their high HOMA-IR indicated insulin resistance. CONCLUSIONS CVI patients are relatively hypoleptinaemic and insulin resistant, and their serum leptin levels are not correlated to their BMI.
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Okay TS, Oliveira WP, Raiz-Júnior R, Rodrigues JC, Del Negro GMB. Frequency of the deltaF508 mutation in 108 cystic fibrosis patients in Sao Paulo: comparison with reported Brazilian data. Clinics (Sao Paulo) 2005; 60:131-4. [PMID: 15880249 DOI: 10.1590/s1807-59322005000200009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
PURPOSE To analyze the frequency of the delta F508 (deltaF508) deletion mutation in 108 unrelated cystic fibrosis patients and compare the results with the previously reported data for Brazilian patients. Cystic fibrosis is the leading cause of genetic disease in Caucasians, and the deltaF508 deletion is the most common mutation associated with the disease. METHOD The frequency of the deltaF508 mutation was assessed by means of a polymerase chain reaction (PCR) followed by detection in 8% silver-stained polyacrylamide gels. RESULTS Twenty-three of 108 patients (21.3%) were homozygous for the deltaF508 deletion, 50 were heterozygous (46.3%), and the remaining 35 (32.4%) were non-carriers. In terms of alleles, there were 96 mutated (96/216 or 44.45%) and 120 wild-type ones (120/216 or 55.5%). CONCLUSION The 44.45% of affected alleles that were found is higher than the 33% first described in 1993, but slightly lower than the 48% recently reported. Moreover, our data corroborated the idea that the frequency of the deltaF508 mutation is lower in Brazil in comparison to that found in studies carried out in Europe and North American (circa 70.0%), probably due to increased racial miscegenation. These findings must be taken into account before any genetic screening of the population is proposed in Brazil.
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Affiliation(s)
- Thelma Suely Okay
- Department of Paediatrics, Hospital das Clínicas, Faculty of Medicine, University of São Paulo, São Paulo, SP, Brazil.
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