What is the SLC19A1 gene?
SLC19A1 helps move reduced folates into cells. That means it affects whether folate can actually support one-carbon metabolism where it is needed.
How SLC19A1 affects metabolism
If folate transport is less efficient, methylation support can feel strained even when intake looks acceptable. That shifts attention toward homocysteine, folate status, and broader one-carbon context.
What happens when SLC19A1 is altered
Altered transport does not automatically mean poor folate status, but it increases the value of validating folate-related support rather than assuming intake solves the issue.
Tracked SNPs used for SLC19A1
Folate transport support feeding one-carbon metabolism.
The directional notes below are shared between the public gene pages and the tracked SNP report so the same SNP list drives both surfaces.
| SNP | Alias | Why it is tracked | Effect allele | Directional note | Confidence | Linked pathway |
|---|---|---|---|---|---|---|
| rs1051266 | 80G>A | Common SLC19A1 transport variant reviewed in folate-handling context. | A | Supporting lower folate-transport efficiency is sometimes reviewed when methylation support looks strained. | low | Methylation |
| rs2838958 | SLC19A1 supporting signal | Supporting SLC19A1 SNP for broader folate-transport coverage. | — | No directional hint published yet. | — | Methylation |
Common symptoms people report
- poor response to folate-focused support
- brain fog or low mental sharpness
- fatigue when methylation demand is high
Biomarkers to validate
Homocysteine
Useful for checking whether one-carbon flow is pressured.
Folate markers
Adds direct substrate context.
Vitamin B12
Helps separate folate transport from broader methylation strain.
Where DNA analysis helps
DNA helps flag when folate transport deserves more attention than generic folate advice would suggest.
Example Insight
Your folate-delivery step may be part of the methylation picture even when folate intake alone looks reasonable.
Suggested validation: homocysteine plus folate status.
What to do next
- Compare folate markers with homocysteine before acting on transport assumptions.
- Review SLC19A1 together with MTHFR and SHMT1 in methylation-focused cases.
- Use biomarker context before escalating folate strategies.
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