3849 + 10 kb C --> T splicing mutation in Hispanic CF patients

Area of Science:

• Genetics
• Pediatrics
• Pulmonology

Background:

• Cystic Fibrosis (CF) is a genetic disorder affecting multiple organs.
• The CFTR gene mutations are the primary cause of CF.
• Specific CFTR mutations may have varying prevalence and clinical presentations across different ethnicities.

Purpose of the Study:

• To investigate the frequency and clinical significance of the 3849 + 10kb C --> T mutation in cystic fibrosis (CF) patients at Childrens Hospital Los Angeles (CHLA).
• To compare the prevalence of this mutation in the CHLA CF population, particularly among Hispanics, to the general CF population.
• To assess the age of diagnosis and clinical characteristics associated with this mutation.

Main Methods:

• Genetic analysis of 152 patients attending the CHLA CF Clinic.
• Identification of patients with compound heterozygous status for the 3849 + 10kb C --> T mutation in the CFTR gene.
• Comparison of mutation frequency with existing data for the general CF population.

Main Results:

• Seven patients (4.6% of the cohort) were found to be compound heterozygous for the 3849 + 10kb C --> T mutation.
• The mutation frequency was 2.3% of total CF alleles and 3.9% of Hispanic CF alleles at CHLA.
• This frequency is significantly higher than the 0.6% observed in the general CF population.
• Hispanic patients with this mutation were diagnosed at an average age of 3.1 years, younger than other ethnicities.
• Both pancreatic sufficient and insufficient phenotypes were observed.

Conclusions:

• The 3849 + 10kb C --> T mutation is significantly more prevalent in the CHLA CF patient population, especially among Hispanics.
• This mutation is associated with an earlier age of diagnosis in Hispanic individuals.
• The mutation is linked to a variable, potentially milder form of cystic fibrosis.