Rare CFTR Mutation Cell Collection Protocol (RARE)
Over 1,900 mutations in the gene for the cystic fibrosis transmembrane conductance regulator (CFTR) protein are implicated in causing Cystic Fibrosis (CF). Potential therapies that directly target defective CFTR are being evaluated in important clinical trials, but most target the most common CFTR mutation F508del. Many patients with rare CF mutations are not able to participate in those studies. The RARE study is specifically designed for people with CF caused by rare mutations. Eligible rare mutations are listed below: • CF patients who are heterozygous for pre-mature stop codons as noted below: i. one allele must be a F508del ii. the other allele must be a pre-mature stop codon mutation • CF Patients with other genotypes that require Study PI permission: i. CF patients with two mutations that are not eligible for Trikafta ii. CF patients homozygous or heterozygous (other allele must be F508del) for rare mutations of special interest (e.g., 711+3A-\>G, 2789+5G-\>A, 3272-26A-\>G, 3849+10kbC-\>T). Other rare mutations will be considered on a case by case basis This is a multi-site, specimen collection study. Investigators will collect blood, intestinal cells and nasal cells from each participant. Cells from these specimens will be used to test future CFTR modulators to see if they might work for people with study eligible rare mutations. Having cells to test in the lab is an important first step in identifying potential new therapies for people with these mutations.
• Male or female ≥ 12 years of age at time of consent
• Documentation of a CF diagnosis as evidenced by one or more clinical features consistent with CF and one or more of the following criteria (1. Sweat chloride ≥ 60 milliequivalents/Liter (mEq/L) by quantitative pilocarpineiontophoresis test (QPIT) OR upon permission of the RARE Investigator- Sponsors, 2. Two well-characterized mutations in the cystic fibrosis transmembrane conductive regulator (CFTR) gene, 3.Abnormal nasal potential difference (NPD) (change in NPD in response to a low chloride solution and isoproterenol of lessthan -6.6 mV)
• Confirmed genotype of the current recruitment focus for certain target rare mutations. The initial recruitment focus will be CF patients who are homozygous for pre-mature stop codons. Operations Memos will detail any future current genotype targets.
• Written informed consent (and assent when applicable) obtained from participant or participant's legal representative and ability to comply with the requirements of the study.
• Willing to travel (if needed) to a regional study site for cell collection.