Rs113993959

rs113993959, also known as G542X, is a SNP in the CFTR cystic fibrosis gene. This mutation is fairly rare, but in Ashkenazi Jews it accounts for ~13% of all cases of cystic fibrosis. See also OMIM 602421.0009.

In 23andMe, rs113993959 may be called one of several names: i4000300, i5006109 or i5011314.