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. 2013 Mar-Apr;39(2):181-9.
doi: 10.1590/s1806-37132013000200009.

Diagnostic contribution of molecular analysis of the cystic fibrosis transmembrane conductance regulator gene in patients suspected of having mild or atypical cystic fibrosis

[Article in English, Portuguese]
Vinícius Buaes Dal'Maso  1 , Lucas Mallmann, Marina Siebert, Laura Simon, Maria Luiza Saraiva-Pereira, Paulo de Tarso Roth Dalcin
Affiliations

Diagnostic contribution of molecular analysis of the cystic fibrosis transmembrane conductance regulator gene in patients suspected of having mild or atypical cystic fibrosis

[Article in English, Portuguese]
Vinícius Buaes Dal'Maso et al. J Bras Pneumol. 2013 Mar-Apr.

Abstract
in English, Portuguese

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.

OBJETIVO:: Avaliar a contribuição da análise molecular do gene cystic fibrosis transmembrane conductance regulator (CFTR, regulador da condutância transmembrana na fibrose cística) na investigação diagnóstica da fibrose cística em pacientes com suspeita de fibrose cística (FC) leve ou atípica.

MÉTODOS:: Estudo transversal em adolescentes e adultos (idade ≥ 14 anos). Os voluntários foram submetidos à avaliação clínica, laboratorial e radiológica; espirometria, microbiologia do escarro, ecografia hepática, teste do suor e análise molecular do gene CFTR. Compararam-se as características dos pacientes divididos em três grupos, segundo o número de mutações identificadas (duas ou mais, uma e nenhuma).

RESULTADOS:: Foram avaliados 37 pacientes com achados fenotípicos de FC, com ou sem confirmação pelo teste do suor. Houve predomínio do sexo feminino (75,7%), e a média de idade dos participantes foi de 32,5 ± 13,6 anos. A análise molecular contribuiu para o diagnóstico de FC em 3 casos (8,1%), todos esses com pelo menos duas mutações. Houve a identificação de uma e nenhuma mutação, respectivamente, em 7 (18,9%) e 26 pacientes (70,3%). Nenhuma característica clínica estudada se associou com o diagnóstico genético. A mutação p.F508del foi a mais comum, encontrada em 5 pacientes. A associação de p.V232D e p.F508del foi encontrada em 2 pacientes. Outras mutações encontradas foram p.A559T, p.D1152H, p.T1057A, p.I148T, p.V754M, p.P1290P, p.R1066H e p.T351S.

CONCLUSÕES:: A análise molecular da região codificadora do gene CFTR apresentou uma contribuição limitada para a investigação diagnóstica desses pacientes com suspeita de FC leve ou atípica. Além disso, não houve associações entre as características clínicas e o diagnóstico genético.

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