Cystic fibrosis carrier testing in an ethnically diverse US population

Area of Science:

• Medical Genetics
• Population Health
• Genetic Epidemiology

Background:

• Cystic Fibrosis (CF) affects individuals differently based on population and specific CFTR mutations.
• Clinical outcomes in CF patients are influenced by genotype but also by other factors.
• Understanding mutation prevalence is crucial for genetic screening and counseling.

Purpose of the Study:

• To determine carrier frequencies for 98 CFTR mutations in a large, diverse US population.
• To investigate ethnic variations in the distribution of cystic fibrosis transmembrane conductance regulator (CFTR) mutations.
• To assess the utility of a broad mutation panel for carrier testing.

Main Methods:

• Utilized an allele-specific primer-extension reaction and bead array hybridization for mutation detection.
• Analyzed data from 364,890 individuals without a family history of CF.
• Screened for 98 distinct CFTR mutations.

Main Results:

• One in 38 individuals tested were carriers of a CFTR mutation.
• Identified 87 different CFTR mutations, with 18 being ethnically restricted.
• Observed significant differences in mutation frequency distribution between Caucasians and African American, Hispanic, and Asian individuals.

Conclusions:

• Broad carrier testing panels effectively identify ethnic disparities in CFTR mutation prevalence within the US.
• Results underscore the need for population-specific considerations in CF carrier screening strategies.
• The study demonstrates the value of comprehensive genetic testing for understanding disease risk across diverse populations.