AncestryDNA MTHFR A1298C marker
MTHFR rs1801131 in AncestryDNA raw data.
If you are searching an AncestryDNA raw DNA file for MTHFR A1298C, the marker most people mean is rs1801131. GenoSight can help you check whether that marker is present, then keep the interpretation cautious inside a broader educational methylation report.
Start with marker coverage
Do this before interpreting the raw letters.
- Use the downloaded AncestryDNA raw DNA file, usually named dna-data-(date).zip
- Search for rs1801131 in the text file or use a browser-only local marker checker
- Treat missing rs1801131 as a coverage issue, not a clinical result
- Interpret A1298C with C677T, COMT, folate context, labs, symptoms, and clinician guidance
What to know before you search the file.
A raw-data search can answer a narrow coverage question. It cannot tell you, by itself, whether you have a methylation issue or need a supplement.
AncestryDNA raw data is uninterpreted
Ancestry describes downloadable DNA data as uninterpreted raw data generated from an AncestryDNA test and used for ancestry, matching, and traits.
Ancestry reports forward-strand genotypes
Ancestry states that SNP genotypes in downloaded DNA data are reported on the genomic forward strand with respect to GRCh37.
GenoSight keeps the next step cautious
The local checker shows marker presence and raw genotype strings. A full report adds context without turning one SNP into supplement instructions.
Keep raw data inside its limits.
GenoSight is educational only. It can help you move from a raw marker lookup to a structured report, but medical decisions require clinical confirmation, labs, and a qualified professional.
Ancestry support: downloading DNA data
Explains raw-data downloads, .txt format, dna-data-(date).zip files, email link timing, forward-strand GRCh37 reporting, and security caveats.
Ancestry account-data download
Explains confirming DNA-data downloads, download-link expiration, managed-test access, and privacy considerations after download.
MedlinePlus MTHFR gene
Describes MTHFR and notes that C677T and 1298A>C are common studied polymorphisms while keeping medical context separate.
Next steps with an AncestryDNA file
Check rs1801131 locally
Use the browser-only checker to see whether the marker appears in your file without uploading it.
ContinueCompare rs1801133
Read the C677T marker page so A1298C is not interpreted in isolation.
ContinueRun Detox & Methylation
Use free signup credits to generate a broader educational report from a compatible raw file.
Continuers1801131 and AncestryDNA questions
Can I find rs1801131 in AncestryDNA raw data?
Sometimes. AncestryDNA chip versions and no-call results can vary, so the right first step is checking whether your specific downloaded file contains rs1801131.
What does rs1801131 mean in MTHFR?
rs1801131 is commonly discussed as MTHFR A1298C. A raw genotype is not a methylation test, diagnosis, or supplement instruction, and it should be interpreted with C677T and broader clinical context.
What if my AncestryDNA file does not show rs1801131?
That usually means the marker is missing, uncalled, or represented differently in that file. It does not prove anything clinically by itself.
Can GenoSight analyze my AncestryDNA file for MTHFR?
Yes, if it is a compatible AncestryDNA raw genotype file. GenoSight can run an educational Detox & Methylation report that frames MTHFR with COMT, folate context, caveats, and source notes.