A haplotype framework for cystic fibrosis mutations in Iran

Area of Science:

• Genetics
• Molecular Biology
• Medical Science

Background:

• Cystic Fibrosis (CF) is a genetic disorder.
• The cystic fibrosis transmembrane conductance regulator (CFTR) gene is implicated in CF.
• Genetic mutation profiles vary significantly across different populations.

Purpose of the Study:

• To comprehensively profile CFTR mutations and haplotypes in the Iranian population.
• To estimate the carrier frequency of CF in Iran.
• To identify geographic-specific CFTR mutations relevant to Iran.

Main Methods:

• Sequencing of all 27 CFTR exons in 60 Iranian CF patients.
• Genotyping of six high-frequency single nucleotide polymorphisms to identify CFTR haplotypes.
• Analysis of mutation spectrum and frequency.

Main Results:

• Eleven core CFTR haplotypes were identified.
• Twenty putative disease-causing mutations were found on 53% of chromosomes.
• The carrier frequency was estimated at 2.5% (1 in 40), suggesting CF is under-diagnosed in Iran.
• The DeltaF508 mutation accounted for only 16% of mutated alleles; five common Iranian mutations were identified, three not on standard panels.

Conclusions:

• Cystic fibrosis may be more prevalent in Iran than previously thought.
• A unique spectrum of CFTR mutations exists in the Iranian population.
• Standard CF mutation panels may not be sufficient for Iranian patients, highlighting the need for geographically specific genetic testing.