Large variations in total and allele-specific transcript expression in a disease mutation-independent manner

Area of Science:

• Genetics
• Molecular Biology
• Medical Research

Background:

• Monogenic diseases display significant clinical variability, even with identical mutations.
• Understanding gene expression in cystic fibrosis (CF) is crucial for personalized medicine.

Purpose of the Study:

• To quantify total and allele-specific CFTR transcript levels in CF patients.
• To investigate the impact of CFTR modulators on transcript levels and allelic expression.

Main Methods:

• Analysis of total and allele-specific CFTR mRNA in nasal brushings from CF patients and controls.
• Quantification of transcript levels before and after treatment with CFTR modulators.

Main Results:

• CF patients exhibited greater variability in total CFTR transcript levels compared to non-CF individuals.
• Compound heterozygous CF patients showed significant allelic skewing, with non-F508del alleles predominating.
• CFTR modulator treatment did not change total CFTR transcript abundance but altered allelic expression patterns.

Conclusions:

• mRNA expression patterns, including allelic skewing, are important factors in CF pathogenesis.
• Findings support the need for personalized therapeutic strategies in CF and other monogenic diseases.
• CFTR modulators influence allelic expression, offering insights into treatment mechanisms.