What is R117H mutation?
R117H Mutation: The R117H mutation is generally considered to be a mild CF (class IV) mutation. When combined with another CF-causing variant it is associated with a broad phenotype, ranging from CF with suppurative lung disease, to no clinical disease.
What can mimic cystic fibrosis?
Beware: there are other diseases that can mimic cystic fibrosis:
- Hirschsprung’s disease.
- bronchiolitis.
- protein calorie malnutrition.
- celiac disease.
- giardiasis.
- asthma.
- immunodeficiency.
- biliary atresia.
How does CFTR mutation cause cystic fibrosis?
In people with CF, mutations in the CFTR gene cause the CFTR protein to malfunction, leading to a buildup of thick mucus. that contains a mutation and one normal copy are considered CF carriers. CF carriers do not have the disease but can pass their copy of the defective gene. Each chromosome carries hundreds of genes.
What is CFTR metabolic syndrome?
The term CFTR-related metabolic syndrome (CRMS) is proposed to describe infants with hypertrypsinogenemia on NBS who have normal or intermediate sweat chloride values and 2 CFTR mutations, including at least one that is not known to cause CF, and thus do not meet CF Foundation guidelines for the diagnosis of CF.
What is 5T variant?
The 5T variant is a common mild variant occurring in one in ten individuals in the general population. 3 It causes abnormal splicing of the CFTR gene transcript, resulting in a 90% reduction of functional CFTR protein.
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.
What are the warning signs of cystic fibrosis?
Symptoms of cystic fibrosis include:
- lung infections or pneumonia.
- wheezing.
- coughing with thick mucus.
- bulky, greasy bowel movements.
- constipation or diarrhea.
- trouble gaining weight or poor height growth.
- very salty sweat.
What is atypical cystic fibrosis?
Atypical CF is a milder form of the CF disorder, which is associated with mutations of the cystic fibrosis transmembrane receptor gene. Instead of having classic symptoms, individuals with atypical CF might only have mild dysfunction in 1 organ system and might or might not have elevated sweat chloride levels.
What does it mean to be a carrier of cystic fibrosis?
A person with one non-functional copy of the gene is a carrier. Carriers for CF have no symptoms, but can pass the non-functioning gene on to their children. An individual must inherit two non-functioning CF genes – one from each parent – to have CF.