For example, a gene on chromosome 7 that has been associated with cystic fibrosis is called the cystic fibrosis transmembrane conductance regulator; its symbol is CFTR.
For example, when people say that someone has "the cystic fibrosis gene," they are usually referring to a mutated version of the CFTR gene, which causes the disease.
All people, including those without cystic fibrosis, have a version of the CFTR gene.
Some disorders, such as sickle cell disease and cystic fibrosis, are caused by mutations in a single gene.
A family history also can provide information about the risk of rarer conditions caused by mutations in a single gene, such as cystic fibrosis and sickle cell disease.
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