What is the MMACHC gene?
Intracellular cobalamin processing needed to generate active methylcobalamin and adenosylcobalamin cofactors.
How MMACHC affects metabolism
When MMACHC-related function is shifted, the practical effect is interpreted through B12 delivery, intracellular cobalamin processing, and methylation support. This does not mean the pathway is active or impaired right now; it means the gene can help prioritize what to check next.
What happens when MMACHC is altered
Altered MMACHC signal should be treated as a DNA-based tendency, not a diagnosis. 4 claims currently pass the report-use gate. The useful question is whether symptoms, labs, and lifestyle context line up with the pathway signal.
Curated SNP evidence for MMACHC
These SNPs come from the approved study-level evidence model. Each claim is scored from curated study rows, then gated before it can influence pathway scoring.
Evidence-backed report connection
MMACHC currently has 4 curated SNPs, 4 claim-level scores, and 4 claims eligible for pathway scoring.
Open the sample reportrs121918241MMACHC p.Arg132Ter1 claims · 2 study rows
biomarker tendency · TT or compound-heterozygous MMACHC deficiency context
Intracellular cobalamin processing tendency
rs121918241 T / MMACHC p.Arg132Ter is associated with lower intracellular cobalamin processing tendency in recessive or compound-heterozygous cblC contexts.
MMACHC rs121918241 T is staged as a recessive cblC loss-of-function allele affecting intracellular B12 processing and methylmalonate/homocysteine biology.
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rs121918242MMACHC p.Arg111Ter1 claims · 2 study rows
biomarker tendency · TT or compound-heterozygous MMACHC deficiency context
Intracellular cobalamin processing tendency
rs121918242 T / MMACHC c.331C>T / p.Arg111Ter is associated with lower intracellular cobalamin processing tendency in recessive or compound-heterozygous cblC contexts.
MMACHC rs121918242 T is staged as a recessive cblC loss-of-function allele affecting intracellular B12 processing and methylmalonate/homocysteine biology.
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rs121918243MMACHC p.Arg161Gln1 claims · 2 study rows
biomarker tendency · AA or compound-heterozygous MMACHC deficiency context
Intracellular cobalamin processing tendency
rs121918243 A / MMACHC p.Arg161Gln is associated with lower intracellular cobalamin processing tendency in recessive or compound-heterozygous cblC contexts.
MMACHC rs121918243 A is staged as a recessive cblC allele affecting intracellular B12 processing and methylmalonate/homocysteine biology.
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rs398124292MMACHC c.271dupA / Arg91fs1 claims · 2 study rows
biomarker tendency · dupA/dupA or compound-heterozygous MMACHC deficiency context
Intracellular cobalamin processing tendency
rs398124292 dupA / MMACHC c.271dupA p.Arg91fs is associated with lower intracellular cobalamin processing tendency in recessive or compound-heterozygous cblC contexts.
MMACHC rs398124292 dupA is staged as a recurrent cblC frameshift allele affecting intracellular B12 processing and methylmalonate/homocysteine biology.
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Common symptoms people report
- fatigue or brain fog despite B12 intake
- nerve or red-blood-cell context needing follow-up
- unclear B12, MMA, or homocysteine patterns
Biomarkers to validate
Serum B12 and methylmalonic acid
Helps distinguish B12 amount from functional use.
Homocysteine
Adds methylation and B12-use context.
CBC and MCV
Checks whether red-blood-cell markers support the pattern.
Where DNA analysis helps
DNA helps decide whether MMACHC deserves attention inside the broader B12 transport pathway. It is most useful when combined with biomarkers instead of used as a standalone answer.
Example interpretation
MMACHC may add context to B12 delivery, intracellular cobalamin processing, and methylation support, especially when its SNP evidence lines up with other genes in the same pathway.
Suggested validation: Serum B12 and methylmalonic acid.
What to do next
- Review the B12 transport pathway result before interpreting MMACHC on its own.
- Use relevant biomarkers to confirm whether this DNA tendency is visible in current biology.
- Treat supplement or nutrition decisions as follow-up steps only after the pattern fits symptoms or labs.
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