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Cystic fibrosis: the delta F508 mutation does not lead to an exceptionally severe phenotype. A cohort study
G Borgo1, P Gasparini, A Bonizzato
1Centro Regionale Veneto Fibrosi Cistica, Ospedale Civile Maggiore, Verona, Italy.
Insights
The delta F508 mutation in cystic fibrosis (CF) does not appear to affect lung or nutritional status in children aged 8.5-10 years. This finding suggests genotype-phenotype correlations in CF may not be evident at this early age.
Area of Science:
- Genetics
- Pediatrics
- Pulmonology
Background:
- Cystic Fibrosis (CF) is a genetic disorder affecting multiple organs.
- Understanding genotype-phenotype relationships is crucial for predicting disease progression and tailoring treatments.
- The delta F508 mutation is the most common CF-causing mutation worldwide.
Purpose of the Study:
- To investigate the relationship between specific genotypes and the clinical presentation of cystic fibrosis.
- To assess pulmonary and nutritional status in relation to the delta F508 mutation in young CF patients.
Main Methods:
- A cohort of 123 pediatric cystic fibrosis patients (aged 8.5-10 years) with known genotypes was studied.
- Patients were followed at a single center with standardized diagnostic and treatment protocols.
- Pulmonary function and nutritional markers were assessed and compared across different genotype groups.
Main Results:
- No significant differences in pulmonary status or nutritional deficiencies were observed between patients homozygous for the delta F508 mutation and those with other genotypes (compound heterozygotes or unspecified).
- Wide variability in pulmonary manifestations was noted across all genotype groups.
- A potential slight increase in mortality among delta F508 homozygotes was considered coincidental given the sample size.
Conclusions:
- In children with cystic fibrosis up to age 10, the severity of lung disease and nutritional status is not directly correlated with the delta F508 mutation.
- Early-onset genotype-phenotype correlations in cystic fibrosis may be less pronounced than previously thought or influenced by other factors.
Abstract:
In an attempt to ascertain a relationship between genotype and phenotype, we studied the pulmonary and nutritional status of 123 cystic fibrosis patients with known genotype at an age of 8.5-10 years. Patients represent a cohort as they are almost all those born and diagnosed in a given area and period. They were followed at a single centre using uniform diagnostic and treatment protocols. Pulmonary and nutritional status of homozygous delta 508 patients did not differ from that of compound heterozygotes or of patients with other unspecified genotypes. Pulmonary manifestations varied widely in all genotype groups. With the given number of patients, a slightly higher mortality of delta F508 homozygotes could have been coincidental. We conclude that up to the age of 8.5-10 years the severity of pulmonary lesions and nutritional deficiencies is not related to the delta F508 mutation.