rs121918241
A SNP in the MMACHC gene on chromosome 1. Its most notable genotype is T;T: methylmalonic aciduria, cblC type
- Gene
- MMACHC
- Location
- Chr 145,508,329 (GRCh38)
- Highest magnitude
- 8.0Very important
- Tested on
- AncestryDNA
Genotypes
As shown in 23andMe and AncestryDNA files.
- C;CGoodcommon in clinvar
- C;TBadCarrier of a methylmalonic aciduria type cblC mutation
- T;TMost notableBadmethylmalonic aciduria, cblC type
On SNPedia: (C;C), (C;T), (T;T). Magnitude rates how notable a genotype is from 0 to 10, not how risky it is.
Related
Other MMACHC SNPs
- rs121918240C;Cmethylmalonic aciduria, cblC typeVery important
- rs121918242T;Tmethylmalonic aciduria, cblC typeVery important
- rs121918243A;Amethylmalonic aciduria, cblC typeVery important
- rs370596113T;Tmethylmalonic aciduria, cblC typeVery important
- rs398124292A;Amethylmalonic aciduria, cblC typeVery important
- rs398124293-;-methylmalonic aciduria, cblC typeVery important
- rs398124295A;Amethylmalonic aciduria, cblC typeVery important
- rs398124296-;-methylmalonic aciduria, cblC typeVery important
Notes
From SNPedia
Notes
C;T
Unaffected in absence of a second MMACHC gene mutation
T;T
This genotype represents two defective MMACHC gene alleles, leading to an inborn error of metabolism known as methylmalonic aciduria, cblC type.
Source and license
Adapted from rs121918241 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 Its entries can be incomplete, out of date or wrong, and nothing here is a diagnosis or medical advice.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.