How F508 mutation affects the CFTR protein structure?
The most common mutation, deletion of phenylalanine 508 (ΔF508), impairs CFTR folding and, consequently, its biosynthetic and endocytic processing as well as chloride channel function.
What kind of mutation is F508?
The Cystic Fibrosis Gene A person with CF inherits two mutated copies of the CFTR gene. These mutations can either be homozygous, the same, or heterozygous, different mutations. The most common mutation is delta F508, accounting for approximately 70% of all mutations.
What is F508 deletion?
The delta F508 is the most common defect in the cystic fibrosis (CF) gene; it involves in a 3-base deletion in codon 508 and results in the loss of a phenylalanine residue at amino acid position 508.
How many nucleotides are found in all of the exons of the CFTR gene?
(a) The CFTR protein contains 1480 amino acids. Thus, it takes 1480×3=4440 nucleotides of mRNA to code for this protein.
What does the delta F508 mutation do?
Abstract. The most common mutation in the gene associated with cystic fibrosis (CF) causes deletion of phenylalanine at residue 508 (delta F508) of the gene product called CFTR. This mutation results in the synthesis of a variant CFTR protein that is defective in its ability to traffic to the plasma membrane.
What is the size of the CFTR gene?
It is now well established that the full-length CFTR mRNA contains 6128 nucleotides.
How large is the CFTR gene?
CFTR gene is localized on the long arm of chromosome 7 (7q21-34), spanning approximately 190 kb of genomic DNA. The gene consists of 27 exons and encodes a mature mRNA transcript of 6.5 kb that is translated into a 1480 amino acid protein (3).
How many base pairs long is the CFTR gene?
approximately 189,000 base pairs
Structure. The CFTR gene resides on the long arm of human chromosome 7 and encompasses approximately 189,000 base pairs of DNA. The coding portion of the gene is divided into 27 exons that are transcribed into a messenger RNA (mRNA) of approximately 6500 base pairs.
How are the different CFTR mutations classified?
There are five classes of CFTR mutations: protein production, protein processing, gating, conduction, and insufficient protein.
How many different mutations in the CFTR gene that can cause cystic fibrosis have been identified?
Mutations in this gene lead to CF. Since the discovery of the CFTR gene in 1989, more than 2,500 mutations have been identified. Cystic fibrosis is caused by mutations in the CFTR gene, which encodes a chloride channel located on the surface of certain epithelial cells.
What is the most common CF mutation?
The most common CF mutation, F508del, is primarily considered to be a processing mutation. The F508del mutation removes a single amino acid from the CFTR protein.
Why is the cystic fibrosis delta F508 mutation so common in Europe?
We therefore propose that the high frequency of the CFTR gene, and in particular, the common Delta F508 allele mutation in current European and European-derived populations might be a consequence of the impact of selective pressures generated by the transmission of pathogenic agents from domesticated animals, mainly …
What causes the F508 mutation?
Cystic Fibrosis The most common mutation in the CFTR gene is ΔF508, a frameshift mutation caused by a three base-pair deletion at codon 508 in exon 10 of CFTR, resulting in the absence of a phenylalanine residue.