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Primary topic: GPX1 antioxidant gene

GPX1 Gene and Metabolism: What It Means for Your Body

GPX1 is part of the glutathione-based antioxidant system and becomes relevant when oxidative buffering may be a real bottleneck.

What is the GPX1 gene?

GPX1 uses glutathione to neutralize peroxides and limit oxidative damage. It works downstream of superoxide handling and is a practical part of the redox network.

How GPX1 affects metabolism

If GPX1-related buffering is weaker, cells may rely more heavily on other antioxidant systems and recover less efficiently when oxidative demand is high.

What happens when GPX1 is altered

Altered GPX1 function is not automatically pathological, but it can make oxidative-load management less forgiving under stress, inflammation, or poor recovery.

Curated SNP evidence for GPX1

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.

Mitochondrial energy Oxidative stress

Evidence-backed report connection

GPX1 currently has 2 curated SNPs, 6 claim-level scores, and 0 claims eligible for pathway scoring.

Open the sample report
rs1050450Pro198Leu3 claims · 9 study rows

enzyme activity · AA

GPX1 enzyme activity

Not used for pathway scoring

rs1050450 AA is associated with reduced GPX1 enzyme activity.

GPX1 rs1050450 is scored as a possible lower GPX1 enzyme-activity tendency for A-containing genotypes, strongest for AA and weaker for AG.

Likely effectLower enzyme activity signal
Signal sizeSmall signal
Evidence supportLimited support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs1050450 in GPX1. In the GPX1 transcript annotation, G corresponds to the Pro form and A corresponds to the Leu form of the Pro198Leu variant.PubMed 19415410functional assay · directJablonska et al. describe GPX1 as an antioxidant selenoenzyme whose activity depends on selenium. Their abstract notes that Pro198Leu is considered functional, that the Leu form showed lower selenium responsiveness in an in-vitro study, and that some human studies observed lower GPX1 activity with the Leu allele.PubMed 25606455biomarker association · loose proxyNajafi et al. measured erythrocyte GPX1 activity and did not find a significant association with rs1050450 in their study population. This supports using only moderate certainty for a simplified lower-activity tendency.

enzyme activity · AG

GPX1 enzyme activity

Not used for pathway scoring

rs1050450 AG is associated with reduced GPX1 enzyme activity.

GPX1 rs1050450 is scored as a possible lower GPX1 enzyme-activity tendency for A-containing genotypes, strongest for AA and weaker for AG.

Likely effectLower enzyme activity signal
Signal sizeSmall signal
Evidence supportLimited support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs1050450 in GPX1. In the GPX1 transcript annotation, G corresponds to the Pro form and A corresponds to the Leu form of the Pro198Leu variant.PubMed 19415410functional assay · directJablonska et al. describe GPX1 as an antioxidant selenoenzyme whose activity depends on selenium. Their abstract notes that Pro198Leu is considered functional, that the Leu form showed lower selenium responsiveness in an in-vitro study, and that some human studies observed lower GPX1 activity with the Leu allele.PubMed 25606455biomarker association · loose proxyNajafi et al. measured erythrocyte GPX1 activity and did not find a significant association with rs1050450 in their study population. This supports using only moderate certainty for a simplified lower-activity tendency.

enzyme activity · GG

GPX1 enzyme activity

Not used for pathway scoring

rs1050450 GG has no scored directional claim for GPX1 enzyme activity.

GPX1 rs1050450 is scored as a possible lower GPX1 enzyme-activity tendency for A-containing genotypes, strongest for AA and weaker for AG.

Likely effectNo clear enzyme signal
Signal sizeMinimal signal
Evidence supportVery limited support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs1050450 in GPX1. In the GPX1 transcript annotation, G corresponds to the Pro form and A corresponds to the Leu form of the Pro198Leu variant.PubMed 19415410functional assay · directJablonska et al. describe GPX1 as an antioxidant selenoenzyme whose activity depends on selenium. Their abstract notes that Pro198Leu is considered functional, that the Leu form showed lower selenium responsiveness in an in-vitro study, and that some human studies observed lower GPX1 activity with the Leu allele.PubMed 25606455biomarker association · loose proxyNajafi et al. measured erythrocyte GPX1 activity and did not find a significant association with rs1050450 in their study population. This supports using only moderate certainty for a simplified lower-activity tendency.
rs1800668GPX1 supporting signal3 claims · 6 study rows

enzyme activity · AA

GPX1 enzyme activity

Not used for pathway scoring

rs1800668 AA is associated with reduced GPX1 enzyme activity.

GPX1 rs1800668 is scored as a weak lower GPX1 enzyme-activity tendency for AA, while AG and GG are left neutral because the evidence is limited.

Likely effectLower enzyme activity signal
Signal sizeSmall signal
Evidence supportModerate support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs1800668 in GPX1 and annotates it as NM_000581.4:c.-46C>T in the 5 prime untranslated region. The RefSNP record reports genomic alleles G and A, supporting a simplified A/G genotype record for this SNP.PubMed 22683538functional assay · loose proxyA 158-person GPX1 study reported that GPX1 activity differed by rs1800668 C/T genotype, with higher activity among CC homozygotes and a higher apparent Km for the TT homozygote than the CC homozygote. Because NCBI maps genomic G to c.-46C and genomic A to c.-46T, this supports a weak lower-activity tendency for AA.

enzyme activity · AG

GPX1 enzyme activity

Not used for pathway scoring

rs1800668 AG has no scored directional claim for GPX1 enzyme activity.

GPX1 rs1800668 is scored as a weak lower GPX1 enzyme-activity tendency for AA, while AG and GG are left neutral because the evidence is limited.

Likely effectNo clear enzyme signal
Signal sizeMinimal signal
Evidence supportVery limited support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs1800668 in GPX1 and annotates it as NM_000581.4:c.-46C>T in the 5 prime untranslated region. The RefSNP record reports genomic alleles G and A, supporting a simplified A/G genotype record for this SNP.PubMed 22683538functional assay · loose proxyA 158-person GPX1 study reported that GPX1 activity differed by rs1800668 C/T genotype, with higher activity among CC homozygotes and a higher apparent Km for the TT homozygote than the CC homozygote. Because NCBI maps genomic G to c.-46C and genomic A to c.-46T, this supports a weak lower-activity tendency for AA.

enzyme activity · GG

GPX1 enzyme activity

Not used for pathway scoring

rs1800668 GG has no scored directional claim for GPX1 enzyme activity.

GPX1 rs1800668 is scored as a weak lower GPX1 enzyme-activity tendency for AA, while AG and GG are left neutral because the evidence is limited.

Likely effectNo clear enzyme signal
Signal sizeMinimal signal
Evidence supportVery limited support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs1800668 in GPX1 and annotates it as NM_000581.4:c.-46C>T in the 5 prime untranslated region. The RefSNP record reports genomic alleles G and A, supporting a simplified A/G genotype record for this SNP.PubMed 22683538functional assay · loose proxyA 158-person GPX1 study reported that GPX1 activity differed by rs1800668 C/T genotype, with higher activity among CC homozygotes and a higher apparent Km for the TT homozygote than the CC homozygote. Because NCBI maps genomic G to c.-46C and genomic A to c.-46T, this supports a weak lower-activity tendency for AA.

Common symptoms people report

  • feeling drained after periods of high demand
  • weaker recovery than workload would suggest
  • more sensitivity to oxidative or inflammatory stressors
  • difficulty judging whether antioxidant strategies are actually helping

Biomarkers to validate

GSH/GSSG ratio

Relevant because GPX1 relies on glutathione-related buffering.

hs-CRP

Adds context where inflammatory load overlaps with oxidative pressure.

Oxidative stress panels when available

Useful for broader redox follow-up.

Where DNA analysis helps

DNA helps prioritize whether glutathione-linked antioxidant defense is worth validating instead of assuming generic antioxidant marketing applies.

Example Insight

Your glutathione-linked defense pathway may deserve direct validation under sustained load.

Suggested validation: GSH/GSSG ratio and oxidative stress context.

What to do next

  • Use glutathione-related markers before making broad antioxidant assumptions.
  • Look at GPX1 with SOD2 and G6PD when redox issues seem clustered.
  • Interpret lab markers together with workload and recovery context.

Upload your DNA file and receive a structured metabolic pathway analysis with prioritized insights and suggested validation markers.

Get My DNA Report

Related pages

SOD2

SOD2 oxidative stress gene

G6PD

G6PD deficiency metabolism

GSH/GSSG ratio

GSH GSSG ratio explained

Oxidative stress panel

oxidative stress panel and redox load

Inflammation and immune signaling pathway

inflammation immune signaling pathway

Iron handling and storage pathway

iron handling storage pathway

Can DNA predict metabolism?

can DNA predict metabolism

Best DNA test for metabolism

best DNA test for metabolism

Related symptom angle

Low energy metabolism causes

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