Rs76173977

rs76173977 is a mutation in the 9th intron (IVS9) of the HEXA gene, and it has been reported as one of the more common mutations seen in non-Jewish Caucasians which can lead to Tay-Sachs disease when present in two copies or when combined with another Tay-Sachs mutation.

The best write-up of this mutation is found in OMIM.

Note that 23andMe refers to this SNP as i4000438.