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Primary topic: GCLC glutathione synthesis gene

GCLC Gene and Metabolism: What It Means for Your Body

GCLC matters when glutathione supply itself may be part of the oxidative-stress problem.

What is the GCLC gene?

GCLC contributes to the rate-limiting step of glutathione synthesis. That makes it a supply-side redox gene rather than only a cleanup enzyme.

How GCLC affects metabolism

If GCLC-related synthesis is weaker, antioxidant reserve can become harder to maintain under demand.

What happens when GCLC is altered

Altered GCLC function does not prove low glutathione in practice, but it increases the value of checking whether reserve looks constrained.

Curated SNP evidence for GCLC

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.

Oxidative stress Sulfur / transsulfuration

Evidence-backed report connection

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

Open the sample report
rs17883901GCLC promoter signal3 claims · 3 study rows

expression · AA

GCLC gene expression

Moderate

rs17883901 AA is associated with reduced GCLC gene expression.

GCLC rs17883901 is scored as a lower GCLC expression tendency for A-containing genotypes, strongest for AA.

Likely effectLower gene expression signal
Signal sizeModerate signal
Evidence supportModerate support
Report useIncluded in pathway scoring
Show study evidence
PubMed 12598062functional assay · directKoide et al. studied a promoter polymorphism in GCLC and reported lower promoter activity, about 50% to 60% of the comparison allele, in response to H2O2 in human endothelial cells. Because GCLC encodes the catalytic subunit of glutamate-cysteine ligase, this supports a lower expression tendency for the lower-promoter-activity genotype pattern.

expression · AG

GCLC gene expression

Moderate

rs17883901 AG is associated with reduced GCLC gene expression.

GCLC rs17883901 is scored as a lower GCLC expression tendency for A-containing genotypes, strongest for AA.

Likely effectLower gene expression signal
Signal sizeSmall signal
Evidence supportModerate support
Report useIncluded in pathway scoring
Show study evidence
PubMed 12598062functional assay · directKoide et al. studied a promoter polymorphism in GCLC and reported lower promoter activity, about 50% to 60% of the comparison allele, in response to H2O2 in human endothelial cells. Because GCLC encodes the catalytic subunit of glutamate-cysteine ligase, this supports a lower expression tendency for the lower-promoter-activity genotype pattern.

expression · GG

GCLC gene expression

Not used for pathway scoring

rs17883901 GG has no scored directional claim for GCLC gene expression.

GCLC rs17883901 is scored as a lower GCLC expression tendency for A-containing genotypes, strongest for AA.

Likely effectNo clear expression signal
Signal sizeMinimal signal
Evidence supportVery limited support
Report useEvidence only, not scored
Show study evidence
PubMed 12598062functional assay · directKoide et al. studied a promoter polymorphism in GCLC and reported lower promoter activity, about 50% to 60% of the comparison allele, in response to H2O2 in human endothelial cells. Because GCLC encodes the catalytic subunit of glutamate-cysteine ligase, this supports a lower expression tendency for the lower-promoter-activity genotype pattern.
rs761142GCLC supporting signal3 claims · 3 study rows

expression · CC

GCLC gene expression

Not used for pathway scoring

rs761142 CC is associated with reduced GCLC gene expression.

GCLC rs761142 is scored as a lower GCLC expression tendency for C-containing genotypes, strongest for CC.

Likely effectLower gene expression signal
Signal sizeModerate signal
Evidence supportModerate support
Report useEvidence only, not scored
Show study evidence
Evidence 1expression eqtl · directA later GCLC variant analysis using public expression resources reported that the rs761142 C allele was associated with reduced GCLC expression in blood, basal ganglia, and cerebral cortex. This supports scoring C-containing genotypes as a lower-expression tendency, while keeping the claim tissue-aware.

expression · AC

GCLC gene expression

Not used for pathway scoring

rs761142 AC is associated with reduced GCLC gene expression.

GCLC rs761142 is scored as a lower GCLC expression tendency for C-containing genotypes, strongest for CC.

Likely effectLower gene expression signal
Signal sizeSmall signal
Evidence supportModerate support
Report useEvidence only, not scored
Show study evidence
Evidence 1expression eqtl · directA later GCLC variant analysis using public expression resources reported that the rs761142 C allele was associated with reduced GCLC expression in blood, basal ganglia, and cerebral cortex. This supports scoring C-containing genotypes as a lower-expression tendency, while keeping the claim tissue-aware.

expression · AA

GCLC gene expression

Not used for pathway scoring

rs761142 AA has no scored directional claim for GCLC gene expression.

GCLC rs761142 is scored as a lower GCLC expression tendency for C-containing genotypes, strongest for CC.

Likely effectNo clear expression signal
Signal sizeMinimal signal
Evidence supportVery limited support
Report useEvidence only, not scored
Show study evidence
Evidence 1expression eqtl · directA later GCLC variant analysis using public expression resources reported that the rs761142 C allele was associated with reduced GCLC expression in blood, basal ganglia, and cerebral cortex. This supports scoring C-containing genotypes as a lower-expression tendency, while keeping the claim tissue-aware.

Common symptoms people report

  • slow recovery
  • sensitivity under oxidative or detox load
  • fatigue that worsens under sustained demand

Biomarkers to validate

GSH/GSSG ratio

Direct reserve-related follow-up.

Oxidative stress panels

Adds broader redox context.

Inflammation context

Useful when oxidative and inflammatory load overlap.

Where DNA analysis helps

DNA helps show when glutathione supply deserves attention instead of assuming every redox issue is only about exposures.

Example Insight

Your glutathione-supply side may deserve follow-up when recovery feels less resilient than expected.

Suggested validation: GSH/GSSG ratio plus an oxidative stress panel.

What to do next

  • Check redox markers before assuming glutathione synthesis is constrained.
  • Review GCLC with GPX1 and NQO1 in oxidative-stress cases.
  • Use the broader pathway rather than one gene alone.

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

Get My DNA Report

Related pages

GPX1

GPX1 antioxidant gene

NQO1

NQO1 redox defense gene

GSH/GSSG ratio

GSH GSSG ratio explained

Oxidative stress panel

oxidative stress panel and redox load

Caffeine and stimulant sensitivity pathway

caffeine stimulant sensitivity pathway

Inflammation and immune signaling pathway

inflammation immune signaling 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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