rs398122706
A SNP in the BRCA1 gene on chromosome 17. Its most notable genotype is A;C: BRCA1 variant considered by most (but not all) sources to be pathogenic for breast cancer
- Gene
- BRCA1
- Location
- Chr 1743,095,845 (GRCh38)
- Highest magnitude
- 6.0Very important
- Tested on
- 23andMe, AncestryDNA
Genotypes
Plus strand, as in 23andMe and AncestryDNA files.
- C;CGoodcommon in clinvar
- A;CMost notableBadBRCA1 variant considered by most (but not all) sources to be pathogenic for breast cancer
SNPedia records rs398122706 on the minus strand: (G;G), (G;T). Magnitude rates how notable a genotype is from 0 to 10, not how risky it is.
Related
Other BRCA1 SNPs
- rs28897696T;Tcarrier of two copies of BRCA1 variant; likely to be at high risk for breast/ovarian cancerVery important
- rs41286296A;CBRCA1 pathogenic mutation associated with breast cancerVery important
- rs62625306A;CBRCA1 pathogenic mutation associated with breast cancerVery important
- rs62625307A;GBRCA1 pathogenic mutation associated with breast cancerVery important
- i6051899A;Clikely to be BRCA1 variant pathogenic for breast cancerVery important
- rs1800747C;TBRCA1 pathogenic mutation associated with breast cancerVery important
- rs28897672A;Tconsidered a pathogenic BRCA1 breast cancer variantVery important
- rs28897686A;CBRCA1 pathogenic mutation associated with breast cancerVery important
Notes
From SNPedia
Notes
aka c.670+1G>T Three out of three sources for ClinVar's entry about this mutation classify this as pathogenic/likely pathogenic for breast cancer; however, in a publication ( authors associated with one private/commercial laboratory argue that it's possible that this mutation may still produce enough functional protein to negate the risk, and therefore, they classify this mutation as being of unknown significance.
A;C
see discussion at rs398122706
Source and license
Adapted from rs398122706 on SNPedia, using a snapshot taken October 16, 2026. SNPedia content is shared under CC BY-NC-SA 3.0 US, and this page is shared under the same license.
SNPedia is a community-edited wiki. Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice. Magnitude is a community rating of how interesting a genotype is, not a risk score.