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Primary topic: CYP1A2 gene DNA analysis

CYP1A2 Gene and Metabolism: What It Can Mean in a Pathway Report

CYP1A2 becomes more useful when caffeine and stimulant sensitivity looks like a meaningful follow-up area instead of just a lifestyle footnote.

What is the CYP1A2 gene?

CYP1A2 contributes to caffeine clearance speed and exposure length. That makes it more useful as part of a pathway view than as an isolated SNP call.

How CYP1A2 affects metabolism

If CYP1A2-related support is less favorable, caffeine can stay active longer and the linked response markers become more useful to validate directly.

What happens when CYP1A2 is altered

An altered CYP1A2 pattern does not diagnose anything on its own, but it does change which follow-up markers deserve attention first.

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

  • stimulant effects can linger longer than expected
  • sleep disruption can track more strongly with ordinary caffeine doses
  • response patterns can look inconsistent without structured review

Biomarkers to validate

Response tracking

Primary follow-up marker for CYP1A2 inside caffeine and stimulant sensitivity.

Sleep disruption pattern

Useful when the pathway needs to be validated as a system rather than as one variant.

Where DNA analysis helps

DNA helps decide whether CYP1A2 should move caffeine and stimulant sensitivity higher on the follow-up list before broad behavioral assumptions are made.

Example interpretation

CYP1A2 can strengthen the case for caffeine and stimulant sensitivity follow-up when the rest of the pathway points in a similar direction.

Suggested validation: response tracking.

What to do next

  • Use response timing and dose effects before assuming the gene matters in practice.
  • Read CYP1A2 alongside AHR and ADORA2A instead of as a standalone result.

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

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Related pages

AHR

AHR gene DNA analysis

ADORA2A

ADORA2A gene DNA analysis

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

caffeine stimulant sensitivity pathway

Estrogen metabolism and clearance pathway

estrogen metabolism clearance pathway

How accurate are DNA metabolism reports?

how accurate are DNA metabolism reports

Best DNA test for metabolism

best DNA test for metabolism

Related symptom angle

Why caffeine hits me hard genetics

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