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Primary topic: CYP1A2 caffeine metabolism gene

CYP1A2 Gene and Metabolism: What It Means for Your Body

CYP1A2 is the gene most people encounter first when they ask why caffeine hits them harder or lasts longer than expected.

What is the CYP1A2 gene?

CYP1A2 encodes a liver enzyme involved in breaking down caffeine and other compounds. When activity is slower, stimulant effects can persist longer and interact more strongly with stress chemistry.

How CYP1A2 affects metabolism

Slower CYP1A2-related clearance can change sleep timing, anxiety sensitivity, and recovery from stimulants. The metabolic consequence is less about energy production directly and more about how stress and stimulant load accumulate.

What happens when CYP1A2 is altered

Altered CYP1A2 activity usually matters in real life because caffeine is common. That makes it one of the clearer gene-to-behavior pathways worth validating through response patterns.

Curated SNP evidence for CYP1A2

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.

Caffeine / stimulant sensitivity

Evidence-backed report connection

CYP1A2 currently has 3 curated SNPs, 12 claim-level scores, and 3 claims eligible for pathway scoring.

Open the sample report
rs2470893CYP1A2 caffeine-consumption supporting signal3 claims · 12 study rows

biomarker tendency · TT

CYP1A2-region caffeine clearance tendency

Moderate

rs2470893 TT is associated with increased CYP1A2-region caffeine clearance tendency.

CYP1A1/CYP1A2-region rs2470893 is treated as a caffeine-intake and caffeine-clearance-linked promoter signal. T-containing genotypes are scored as a higher caffeine-clearance-linked tendency, with TT stronger than CT.

Likely effectHigher biomarker tendency
Signal sizeSmall signal
Evidence supportStrong support
Report useIncluded in pathway scoring
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP identifies rs2470893 as a variation record in the chromosome 15 CYP1A1/CYP1A2 region. The scored caffeine literature for this file uses the common C/T labels.Amin et al. 2012, PMID 21876539gwas · close proxyA coffee-drinking GWAS and replication study reported that the rs2470893 T allele in the CYP1A1/CYP1A2 region was consistently positively associated with coffee consumption. Higher genetically influenced consumption at this locus is interpreted as a close proxy for higher caffeine-clearance tendency.Cornelis et al. 2011, PMID 21490707gwas · close proxyA GWAS meta-analysis of habitual caffeine intake mapped rs2470893 to the bidirectional CYP1A1/CYP1A2 promoter region. The study noted that rs2470893 lies in an AHR response element linked to transcriptional activation of CYP1A1 and CYP1A2, and supplementary genotype means showed higher intake in T/T than C/C groups.Rasmussen et al. 2016, PMID 27509179biomarker association · directA caffeine-metabolism twin study reported that rs2470893 explained part of caffeine AUC variation. This supports rs2470893 as close to measured caffeine pharmacokinetics, while the genotype direction is anchored to the T-allele intake direction from the larger GWAS sources.

biomarker tendency · CT

CYP1A2-region caffeine clearance tendency

Moderate

rs2470893 CT is associated with increased CYP1A2-region caffeine clearance tendency.

CYP1A1/CYP1A2-region rs2470893 is treated as a caffeine-intake and caffeine-clearance-linked promoter signal. T-containing genotypes are scored as a higher caffeine-clearance-linked tendency, with TT stronger than CT.

Likely effectHigher biomarker tendency
Signal sizeSmall signal
Evidence supportStrong support
Report useIncluded in pathway scoring
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP identifies rs2470893 as a variation record in the chromosome 15 CYP1A1/CYP1A2 region. The scored caffeine literature for this file uses the common C/T labels.Amin et al. 2012, PMID 21876539gwas · close proxyA coffee-drinking GWAS and replication study reported that the rs2470893 T allele in the CYP1A1/CYP1A2 region was consistently positively associated with coffee consumption. Higher genetically influenced consumption at this locus is interpreted as a close proxy for higher caffeine-clearance tendency.Cornelis et al. 2011, PMID 21490707gwas · close proxyA GWAS meta-analysis of habitual caffeine intake mapped rs2470893 to the bidirectional CYP1A1/CYP1A2 promoter region. The study noted that rs2470893 lies in an AHR response element linked to transcriptional activation of CYP1A1 and CYP1A2, and supplementary genotype means showed higher intake in T/T than C/C groups.Rasmussen et al. 2016, PMID 27509179biomarker association · directA caffeine-metabolism twin study reported that rs2470893 explained part of caffeine AUC variation. This supports rs2470893 as close to measured caffeine pharmacokinetics, while the genotype direction is anchored to the T-allele intake direction from the larger GWAS sources.

biomarker tendency · CC

CYP1A2-region caffeine clearance tendency

Not used for pathway scoring

rs2470893 CC has no scored directional claim for CYP1A2-region caffeine clearance tendency.

CYP1A1/CYP1A2-region rs2470893 is treated as a caffeine-intake and caffeine-clearance-linked promoter signal. T-containing genotypes are scored as a higher caffeine-clearance-linked tendency, with TT stronger than CT.

Likely effectNo clear biomarker tendency
Signal sizeMinimal signal
Evidence supportVery limited support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP identifies rs2470893 as a variation record in the chromosome 15 CYP1A1/CYP1A2 region. The scored caffeine literature for this file uses the common C/T labels.Amin et al. 2012, PMID 21876539gwas · close proxyA coffee-drinking GWAS and replication study reported that the rs2470893 T allele in the CYP1A1/CYP1A2 region was positively associated with coffee consumption. This source supports T-containing genotypes rather than CC for the directional claim.Cornelis et al. 2011, PMID 21490707gwas · close proxyA GWAS meta-analysis of habitual caffeine intake mapped rs2470893 to the bidirectional CYP1A1/CYP1A2 promoter region and reported stronger caffeine intake in T/T than C/C genotype groups. This source supports T-containing genotypes rather than CC.Rasmussen et al. 2016, PMID 27509179biomarker association · directA caffeine-metabolism twin study reported that rs2470893 explained part of caffeine AUC variation, supporting this marker as close to measured caffeine pharmacokinetics. The abstract-level source does not assign a genotype direction for CC, so it is neutral for this exact claim.
rs2472297CYP1A2 supporting signal3 claims · 12 study rows

enzyme activity · CT

CYP1A2 enzyme activity

Not used for pathway scoring

rs2472297 CT is associated with increased CYP1A2 enzyme activity.

CYP1A2-region rs2472297 is scored as a caffeine-metabolism tendency: T-containing genotypes are assigned a higher CYP1A2-linked caffeine clearance tendency, stronger for TT than CT.

Likely effectHigher enzyme activity signal
Signal sizeSmall signal
Evidence supportModerate support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs2472297 at chromosome 15 near the CYP1A1 and CYP1A2 region and lists C and T as common allele labels in population data. This supports the genotype labels used here.PMC3080612gwas · close proxyA genome-wide meta-analysis reported that rs2472297-T near CYP1A1-CYP1A2 was associated with higher habitual coffee consumption. The authors proposed greater caffeine clearance through higher CYP1A1 or CYP1A2 activity as a possible explanation, while noting that this mechanism was not proven experimentally in that study.PMC4388784gwas · close proxyA larger coffee-consumption GWAS review noted that the rs2472297 T allele has been associated with lower plasma caffeine levels and increased CYP1A2-mediated metabolism in published work. This supports a cautious T-allele-dose score for higher CYP1A2-linked caffeine metabolism tendency.PMC11515775review · close proxyA systematic review summarized rs2472297-T as a caffeine metabolism-related CYP1A1/2 signal and stated that genotypes associated with higher CYP1A2 inducibility, including rs2472297-T, are more likely to rapidly metabolize caffeine. This supports the direction while retaining moderate certainty.

enzyme activity · TT

CYP1A2 enzyme activity

Not used for pathway scoring

rs2472297 TT is associated with increased CYP1A2 enzyme activity.

CYP1A2-region rs2472297 is scored as a caffeine-metabolism tendency: T-containing genotypes are assigned a higher CYP1A2-linked caffeine clearance tendency, stronger for TT than CT.

Likely effectHigher enzyme activity signal
Signal sizeSmall signal
Evidence supportModerate support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs2472297 at chromosome 15 near the CYP1A1 and CYP1A2 region and lists C and T as common allele labels in population data. This supports the genotype labels used here.PMC3080612gwas · close proxyA genome-wide meta-analysis reported that rs2472297-T near CYP1A1-CYP1A2 was associated with higher habitual coffee consumption. The authors proposed greater caffeine clearance through higher CYP1A1 or CYP1A2 activity as a possible explanation, while noting that this mechanism was not proven experimentally in that study.PMC4388784gwas · close proxyA larger coffee-consumption GWAS review noted that the rs2472297 T allele has been associated with lower plasma caffeine levels and increased CYP1A2-mediated metabolism in published work. This supports a cautious T-allele-dose score for higher CYP1A2-linked caffeine metabolism tendency.PMC11515775review · close proxyA systematic review summarized rs2472297-T as a caffeine metabolism-related CYP1A1/2 signal and stated that genotypes associated with higher CYP1A2 inducibility, including rs2472297-T, are more likely to rapidly metabolize caffeine. This supports the direction while retaining moderate certainty.

enzyme activity · CC

CYP1A2 enzyme activity

Not used for pathway scoring

rs2472297 CC has no scored directional claim for CYP1A2 enzyme activity.

CYP1A2-region rs2472297 is scored as a caffeine-metabolism tendency: T-containing genotypes are assigned a higher CYP1A2-linked caffeine clearance tendency, stronger for TT than CT.

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 rs2472297 at chromosome 15 near the CYP1A1 and CYP1A2 region and lists C and T as common allele labels in population data. This supports the genotype labels used here.PMC3080612gwas · close proxyA genome-wide meta-analysis reported that rs2472297-T near CYP1A1-CYP1A2 was associated with higher habitual coffee consumption. The authors proposed greater caffeine clearance through higher CYP1A1 or CYP1A2 activity as a possible explanation, while noting that this mechanism was not proven experimentally in that study.PMC4388784gwas · close proxyA larger coffee-consumption GWAS review noted that the rs2472297 T allele has been associated with lower plasma caffeine levels and increased CYP1A2-mediated metabolism in published work. This supports a cautious T-allele-dose score for higher CYP1A2-linked caffeine metabolism tendency.PMC11515775review · close proxyA systematic review summarized rs2472297-T as a caffeine metabolism-related CYP1A1/2 signal and stated that genotypes associated with higher CYP1A2 inducibility, including rs2472297-T, are more likely to rapidly metabolize caffeine. This supports the direction while retaining moderate certainty.
rs762551-163C>A6 claims · 18 study rows

enzyme activity · AA

CYP1A2 enzyme activity

Moderate

rs762551 AA is associated with increased CYP1A2 enzyme activity.

For common A/C calls, rs762551 is scored as a CYP1A2 caffeine-metabolism tendency: AA has the strongest higher-activity tendency, AC is weaker and less certain, and CC is not scored as increased.

Likely effectHigher enzyme activity signal
Signal sizeSmall signal
Evidence supportModerate support
Report useIncluded in pathway scoring
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs762551 in CYP1A2 and lists A, C, and a rare G observation for this marker. The common A/C contrast is the source-supported comparison used for the scored genotypes.PubMed 36701157biomarker association · directA prospective cohort study described CYP1A2 as a major caffeine-detoxifying enzyme and analyzed rs762551 with AA classified as fast caffeine metabolism and AC or CC as slower caffeine metabolism. The kidney outcomes in that study are not used here as a disease prediction.PubMed 19636338biomarker association · loose proxyA pharmacogenetic study reported that the CYP1A2*1F genotype, marked by rs762551 -163A, was associated with lower dose-normalized olanzapine serum concentrations, consistent with higher CYP1A2-mediated metabolism in that drug context.

enzyme activity · AC

CYP1A2 enzyme activity

Not used for pathway scoring

rs762551 AC is associated with increased CYP1A2 enzyme activity.

For common A/C calls, rs762551 is scored as a CYP1A2 caffeine-metabolism tendency: AA has the strongest higher-activity tendency, AC is weaker and less certain, and CC is not scored as increased.

Likely effectHigher enzyme activity signal
Signal sizeSmall signal
Evidence supportModerate support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs762551 in CYP1A2 and lists A, C, and a rare G observation for this marker. The common A/C contrast is the source-supported comparison used for the scored genotypes.PubMed 36701157biomarker association · directA prospective cohort study described CYP1A2 as a major caffeine-detoxifying enzyme and analyzed rs762551 with AA classified as fast caffeine metabolism and AC or CC as slower caffeine metabolism. The kidney outcomes in that study are not used here as a disease prediction.PubMed 19636338biomarker association · loose proxyA pharmacogenetic study reported that the CYP1A2*1F genotype, marked by rs762551 -163A, was associated with lower dose-normalized olanzapine serum concentrations, consistent with higher CYP1A2-mediated metabolism in that drug context.

enzyme activity · AG

CYP1A2 enzyme activity

Not used for pathway scoring

rs762551 AG has no scored directional claim for CYP1A2 enzyme activity.

For common A/C calls, rs762551 is scored as a CYP1A2 caffeine-metabolism tendency: AA has the strongest higher-activity tendency, AC is weaker and less certain, and CC is not scored as increased.

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 rs762551 in CYP1A2 and lists A, C, and a rare G observation for this marker. The common A/C contrast is the source-supported comparison used for the scored genotypes.PubMed 36701157biomarker association · directA prospective cohort study described CYP1A2 as a major caffeine-detoxifying enzyme and analyzed rs762551 with AA classified as fast caffeine metabolism and AC or CC as slower caffeine metabolism. The kidney outcomes in that study are not used here as a disease prediction.PubMed 19636338biomarker association · loose proxyA pharmacogenetic study reported that the CYP1A2*1F genotype, marked by rs762551 -163A, was associated with lower dose-normalized olanzapine serum concentrations, consistent with higher CYP1A2-mediated metabolism in that drug context.

enzyme activity · CC

CYP1A2 enzyme activity

Not used for pathway scoring

rs762551 CC has no scored directional claim for CYP1A2 enzyme activity.

For common A/C calls, rs762551 is scored as a CYP1A2 caffeine-metabolism tendency: AA has the strongest higher-activity tendency, AC is weaker and less certain, and CC is not scored as increased.

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 rs762551 in CYP1A2 and lists A, C, and a rare G observation for this marker. The common A/C contrast is the source-supported comparison used for the scored genotypes.PubMed 36701157biomarker association · directA prospective cohort study described CYP1A2 as a major caffeine-detoxifying enzyme and analyzed rs762551 with AA classified as fast caffeine metabolism and AC or CC as slower caffeine metabolism. The kidney outcomes in that study are not used here as a disease prediction.PubMed 19636338biomarker association · loose proxyA pharmacogenetic study reported that the CYP1A2*1F genotype, marked by rs762551 -163A, was associated with lower dose-normalized olanzapine serum concentrations, consistent with higher CYP1A2-mediated metabolism in that drug context.

enzyme activity · CG

CYP1A2 enzyme activity

Not used for pathway scoring

rs762551 CG has no scored directional claim for CYP1A2 enzyme activity.

For common A/C calls, rs762551 is scored as a CYP1A2 caffeine-metabolism tendency: AA has the strongest higher-activity tendency, AC is weaker and less certain, and CC is not scored as increased.

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 rs762551 in CYP1A2 and lists A, C, and a rare G observation for this marker. The common A/C contrast is the source-supported comparison used for the scored genotypes.PubMed 36701157biomarker association · directA prospective cohort study described CYP1A2 as a major caffeine-detoxifying enzyme and analyzed rs762551 with AA classified as fast caffeine metabolism and AC or CC as slower caffeine metabolism. The kidney outcomes in that study are not used here as a disease prediction.PubMed 19636338biomarker association · loose proxyA pharmacogenetic study reported that the CYP1A2*1F genotype, marked by rs762551 -163A, was associated with lower dose-normalized olanzapine serum concentrations, consistent with higher CYP1A2-mediated metabolism in that drug context.

enzyme activity · GG

CYP1A2 enzyme activity

Not used for pathway scoring

rs762551 GG has no scored directional claim for CYP1A2 enzyme activity.

For common A/C calls, rs762551 is scored as a CYP1A2 caffeine-metabolism tendency: AA has the strongest higher-activity tendency, AC is weaker and less certain, and CC is not scored as increased.

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 rs762551 in CYP1A2 and lists A, C, and a rare G observation for this marker. The common A/C contrast is the source-supported comparison used for the scored genotypes.PubMed 36701157biomarker association · directA prospective cohort study described CYP1A2 as a major caffeine-detoxifying enzyme and analyzed rs762551 with AA classified as fast caffeine metabolism and AC or CC as slower caffeine metabolism. The kidney outcomes in that study are not used here as a disease prediction.PubMed 19636338biomarker association · loose proxyA pharmacogenetic study reported that the CYP1A2*1F genotype, marked by rs762551 -163A, was associated with lower dose-normalized olanzapine serum concentrations, consistent with higher CYP1A2-mediated metabolism in that drug context.

Common symptoms people report

  • caffeine lingering late into the day
  • jitters or anxiety from modest coffee intake
  • sleep disruption after afternoon caffeine
  • stronger reaction to stimulants than other people

Biomarkers to validate

Caffeine response log

Practical tracking often gives more signal here than a blood test.

Resting heart rate or wearable recovery data

Useful when stimulant load affects stress physiology.

Sleep quality metrics

Helps show whether slower clearance is affecting recovery.

Where DNA analysis helps

DNA helps explain whether caffeine handling deserves attention before you assume your stress response is random. It should be paired with actual response tracking.

Example Insight

Your caffeine-clearance pathway may be slower, increasing the chance that stimulants spill into recovery time.

Suggested validation: caffeine-response and sleep tracking.

What to do next

  • Track dose timing and sleep response instead of guessing.
  • Compare CYP1A2 with COMT when stimulant sensitivity feels amplified.
  • Use lower late-day caffeine exposure until real-world response is clear.

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

Get My DNA Report

Related pages

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MAOA gene metabolism

Caffeine clearance and response

Caffeine clearance and response DNA follow-up

Sleep disruption and stimulant load

Sleep disruption and stimulant load DNA follow-up

Caffeine and stimulant sensitivity pathway

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Estrogen metabolism and clearance pathway

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How accurate are DNA metabolism reports?

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Best DNA test for metabolism

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Related symptom angle

Why caffeine hits me hard genetics

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