CFTR mutations and polymorphisms in male infertility

Area of Science:

• Genetics
• Reproductive Medicine
• Molecular Biology

Background:

• Mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene are linked to cystic fibrosis (CF) and congenital bilateral absence of the vas deferens (CBAVD).
• While CFTR gene mutations are found in approximately 80% of CBAVD patients, the genetic cause for the remaining cases remains unidentified.
• Unlike CF patients, CBAVD patients with CFTR mutations typically have at least one mild mutation, and polyvariant mutant CFTR genes are most common.

Purpose of the Study:

• To explore the genetic underpinnings of congenital bilateral absence of the vas deferens (CBAVD).
• To investigate the role of cystic fibrosis transmembrane conductance regulator (CFTR) gene mutations in CBAVD.
• To highlight the implications for reproductive choices and genetic counseling in affected individuals.

Main Methods:

• Genetic analysis of CFTR genes in patients with congenital bilateral absence of the vas deferens (CBAVD).
• Identification and characterization of various CFTR gene mutations and their combinations.
• Comparison of CFTR mutation profiles between CBAVD patients and cystic fibrosis patients.

Main Results:

• A significant proportion of CBAVD cases are associated with CFTR gene mutations, often mild or polyvariant.
• Tissue-specific alternative splicing of CFTR may explain the absence of lung disease in some CBAVD patients.
• CBAVD patients can father children via assisted reproductive technologies, but carry an increased risk for offspring with cystic fibrosis.

Conclusions:

• CFTR gene mutations are a significant cause of congenital bilateral absence of the vas deferens (CBAVD).
• Understanding CFTR genetics in CBAVD is crucial for reproductive decision-making.
• Genetic testing and counseling are essential for couples affected by CBAVD to mitigate the risk of passing on cystic fibrosis.