rs121908745(A;A)

Common (in Ancestry reports); no need to worry

Is a	genotype
of	rs121908745
Gene	CFTR
Chromosome	7
Position	117,559,590
mentioned	by

Magnitude

0

Repute

Good

Geno	Mag	Summary
(-;ATC)	3	carrier of a cystic fibrosis allele
(A;A)	0	Common (in Ancestry reports); no need to worry
(ATC;ATC)	0	common in clinvar

The (A;A) genotype is the most commonly reported one for Ancestry users, so it's the common/normal form. However, in public databases, rs121908745 should be either "ATC" or "nothing", in other words, a deletion of the "ATC", so to report (A;A) as a possible genotype for this SNP is actually an error on Ancestry's part.