rs4648261
A SNP in the PTGS2 gene on chromosome 1. Its most notable genotype is C;C: common in complete genomics
- Gene
- PTGS2
- Location
- Chr 1186,679,872 (GRCh38)
- Highest magnitude
- 0.0Typical
- Tested on
- 23andMe, AncestryDNA, FamilyTreeDNA
- Minor allele frequency
- 1%
Genotypes
Plus strand, as in 23andMe and AncestryDNA files.
SNPedia records rs4648261 on the minus strand: (G;G). Magnitude rates how notable a genotype is from 0 to 10, not how risky it is.
Frequency
Share of each genotype in 8 HapMap populations.
- AverageC;C 98%
- European ancestry (Utah)C;C 94%
- Han Chinese (Beijing)C;C 100%
- Japanese (Tokyo)C;C 100%
- Yoruba (Nigeria)C;C 100%
- African ancestry (Southwest US)C;C 95%
- Gujarati IndianC;C 98%
- Mexican ancestry (Los Angeles)C;C 98%
- TuscanC;C 97%
Related
Conditions, medicines and genes
Other PTGS2 SNPs
- rs689466C;C1.4x higher risk for inflammatory bowel diseasesMinor
- rs5270G;Gcommon in complete genomicsTypical
- rs5275G;G0.68x decreased risk for bladder cancerTypical
- rs20415G;GNo summary available.Typical
- rs20417G;GNo summary available.Typical
- rs689465T;T1.5x increased risk for mild asthmaTypical
- rs689469C;CNo summary available.Typical
- rs689470G;GNo summary available.Typical
Notes
From SNPedia
Show notes, about 120 words
news rs4648261 was linked with a reduction in colorectal cancer risk of between 40 to 68 percent. Furthermore, characterizing patients by two SNPs in COX2 suggested that only a subset of patients would derive benefit from NSAID use. The article notes a paper from AE. Coghill, C. Ulrich where a variety of COX2 genes PTGS-1 variants were associated with CRC survival. One, G>A intron 9 (rs1213266), was associated with ~50% lower CRC mortality (HRAA/AG vs. GG:0.48; 95% CI 0.25-0.93). Three variants, including L237M, resulted in significantly elevated CRC mortality risk, with hazard ratios ranging from approximately 1.5-2.0. Two variants in IkappaBKbeta, including R526Q, were significantly associated with CRC survival.
Source and license
Adapted from rs4648261 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 Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice.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.