I4000377
From SNPedia
https://www.23andme.com/health/brca/
i4000377, i4000378, i4000379 are markers that influence your carrier status for breast cancer and ovarian cancer.
185delAG BRCA1 i4000377(D;D) or i4000377(D;I)
rs77944974 is the dbSNP rsid for this SNP; it is likely to be included in release b131 of dbSNP.