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Primary topic: ADORA2A gene DNA analysis

ADORA2A Gene and Metabolism: What It Can Mean in a Pathway Report

ADORA2A becomes more useful when caffeine / stimulant sensitivity looks like a meaningful follow-up area instead of just background context.

What is the ADORA2A gene?

ADORA2A contributes to adenosine receptor sensitivity to stimulants. That makes it more useful as part of a pathway view than as an isolated SNP call.

How ADORA2A affects metabolism

If ADORA2A-related support is less favorable, the pathway can look more pressured under load and the linked biomarkers become more useful to validate directly.

What happens when ADORA2A is altered

An altered ADORA2A pattern does not diagnose anything on its own, but it does change which follow-up markers deserve attention first.

Curated SNP evidence for ADORA2A

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

ADORA2A currently has 3 curated SNPs, 9 claim-level scores, and 2 claims eligible for pathway scoring.

Open the sample report
rs2298383ADORA2A supporting signal3 claims · 9 study rows

unknown · CC

ADORA2A unscored target

Not used for pathway scoring

rs2298383 CC has no scored directional claim for ADORA2A unscored target.

ADORA2A rs2298383 has been studied for caffeine-related anxiety and sleep patterns, but the evidence is mixed and context-dependent, so this simplified record does not assign a directional effect.

Likely effectNo clear DNA signal
Signal sizeMinimal signal
Evidence supportVery limited support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs2298383 in the ADORA2A region and lists C and T as common allele labels in population data. This supports the genotype labels used here.PMC2745641other · loose proxyA caffeine challenge study reported that ADORA2A rs2298383 showed a genotype-related anxiety signal in European-American participants, with the CC genotype tending toward more anxiety after caffeine. The study context was specific and does not establish a broad standalone health effect.PMC3055635other · loose proxyA later caffeine study found rs2298383 showed a nominal anxiety association after 100 mg caffeine but was not clearly significant after adjustment for testing multiple ADORA2A variants. This makes a directional simplified score too uncertain.

unknown · CT

ADORA2A unscored target

Not used for pathway scoring

rs2298383 CT has no scored directional claim for ADORA2A unscored target.

ADORA2A rs2298383 has been studied for caffeine-related anxiety and sleep patterns, but the evidence is mixed and context-dependent, so this simplified record does not assign a directional effect.

Likely effectNo clear DNA signal
Signal sizeMinimal signal
Evidence supportVery limited support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs2298383 in the ADORA2A region and lists C and T as common allele labels in population data. This supports the genotype labels used here.PMC2745641other · loose proxyA caffeine challenge study reported that ADORA2A rs2298383 showed a genotype-related anxiety signal in European-American participants, with the CC genotype tending toward more anxiety after caffeine. The study context was specific and does not establish a broad standalone health effect.PMC3055635other · loose proxyA later caffeine study found rs2298383 showed a nominal anxiety association after 100 mg caffeine but was not clearly significant after adjustment for testing multiple ADORA2A variants. This makes a directional simplified score too uncertain.

unknown · TT

ADORA2A unscored target

Not used for pathway scoring

rs2298383 TT has no scored directional claim for ADORA2A unscored target.

ADORA2A rs2298383 has been studied for caffeine-related anxiety and sleep patterns, but the evidence is mixed and context-dependent, so this simplified record does not assign a directional effect.

Likely effectNo clear DNA signal
Signal sizeMinimal signal
Evidence supportVery limited support
Report useEvidence only, not scored
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs2298383 in the ADORA2A region and lists C and T as common allele labels in population data. This supports the genotype labels used here.PMC2745641other · loose proxyA caffeine challenge study reported that ADORA2A rs2298383 showed a genotype-related anxiety signal in European-American participants, with the CC genotype tending toward more anxiety after caffeine. The study context was specific and does not establish a broad standalone health effect.PMC3055635other · loose proxyA later caffeine study found rs2298383 showed a nominal anxiety association after 100 mg caffeine but was not clearly significant after adjustment for testing multiple ADORA2A variants. This makes a directional simplified score too uncertain.
rs4822492ADORA2A caffeine-anxiety supporting signal3 claims · 10 study rows

biomarker tendency · CC

ADORA2A caffeine-response sensitivity

Moderate

rs4822492 CC is associated with increased ADORA2A caffeine-response sensitivity.

ADORA2A rs4822492 is scored as a receptor-context caffeine-response marker, with CC assigned a higher sensitivity tendency based on caffeine-induced anxiety and stimulant physiology evidence.

Likely effectHigher biomarker tendency
Signal sizeSmall signal
Evidence supportModerate support
Report useIncluded in pathway scoring
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP identifies rs4822492 as a variation record in the ADORA2A region. The scored caffeine-response literature for this file uses C/G genotype labels.Childs et al. 2008, PMID 18305461biomarker association · directA double-blind caffeine challenge study reported a significant association between caffeine-induced anxiety after 150 mg caffeine and ADORA2A rs4822492. The genotype plot and related summaries support CC as the higher-anxiety genotype, while the small sample and linked ADORA2A markers keep certainty moderate.Baggott et al. 2013, PMID 23420115biomarker association · close proxyA human methylxanthine challenge study genotyped ADORA2A rs4822492 and reported that CC participants had greater physiological response across active conditions, including elevated peak heart rate compared with CG and GG groups. This supports CC as a stimulant-response sensitivity marker, though the effect was not caffeine-specific in isolation.Erblang et al. 2019, Genes 10(12):1021biomarker association · close proxyA population study of ADORA2A variants, caffeine intake, and sleep reported that rs4822492 was part of a linked ADORA2A sleep/caffeine haplotype context. The results support rs4822492 as relevant to caffeine-related sleep response, but the CC direction is weaker and partly phenotype-dependent.

biomarker tendency · CG

ADORA2A caffeine-response sensitivity

Not used for pathway scoring

rs4822492 CG has no scored directional claim for ADORA2A caffeine-response sensitivity.

ADORA2A rs4822492 is scored as a receptor-context caffeine-response marker, with CC assigned a higher sensitivity tendency based on caffeine-induced anxiety and stimulant physiology evidence.

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 rs4822492 as a variation record in the ADORA2A region. The scored caffeine-response literature for this file uses C/G genotype labels.Childs et al. 2008, PMID 18305461biomarker association · directA double-blind caffeine challenge study reported a significant association between caffeine-induced anxiety after 150 mg caffeine and ADORA2A rs4822492. The simplified scoring keeps CG neutral because the directional signal is curated for CC.Baggott et al. 2013, PMID 23420115biomarker association · close proxyA human methylxanthine challenge study reported greater physiological response for CC than CG or GG groups at rs4822492. The simplified scoring keeps CG neutral because the source supports CC as the higher-response genotype.

biomarker tendency · GG

ADORA2A caffeine-response sensitivity

Not used for pathway scoring

rs4822492 GG has no scored directional claim for ADORA2A caffeine-response sensitivity.

ADORA2A rs4822492 is scored as a receptor-context caffeine-response marker, with CC assigned a higher sensitivity tendency based on caffeine-induced anxiety and stimulant physiology evidence.

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 rs4822492 as a variation record in the ADORA2A region. The scored caffeine-response literature for this file uses C/G genotype labels.Childs et al. 2008, PMID 18305461biomarker association · directA double-blind caffeine challenge study reported a significant association between caffeine-induced anxiety after 150 mg caffeine and ADORA2A rs4822492. The simplified scoring keeps GG neutral because the directional signal is curated for CC.Baggott et al. 2013, PMID 23420115biomarker association · close proxyA human methylxanthine challenge study reported greater physiological response for CC than CG or GG groups at rs4822492. The simplified scoring keeps GG neutral because the source supports CC as the higher-response genotype.
rs57518761976C>T3 claims · 12 study rows

biomarker tendency · TT

ADORA2A biomarker tendency

Moderate

rs5751876 TT is associated with increased ADORA2A biomarker tendency.

ADORA2A rs5751876 is scored as a caffeine-response sensitivity tendency, with TT assigned a higher sensitivity score and CC or CT left neutral in this simplified model.

Likely effectHigher biomarker tendency
Signal sizeSmall signal
Evidence supportModerate support
Report useIncluded in pathway scoring
Show study evidence
NCBI RefSNP recordidentity only · unknownNCBI RefSNP places rs5751876 in ADORA2A and lists C and T as the observed alleles on the preferred genomic placement. This supports the C/T genotype labels used here.PMC2745641biomarker association · close proxyA double-blind caffeine challenge study reported that ADORA2A rs5751876 was associated with self-reported anxiety after a moderate caffeine dose, with TT participants showing the highest anxiety response and CC participants the lowest in the full sample. The study also noted that other ADORA2A and DRD2 variants may contribute.PMC3055635biomarker association · loose proxyA larger caffeine-response study reported that caffeine's anxiogenic effect was larger in ADORA2A rs5751876 TT participants, especially among people who usually consumed little or no caffeine. This supports scoring TT as higher caffeine-response sensitivity while leaving CT unscored in this simplified file.PMC8322233review · close proxyA review of adenosine A2A receptor variants summarized rs5751876 TT as repeatedly linked to enhanced caffeine-induced anxiety and other caffeine-response differences. It also describes rs5751876 as a marker within a broader ADORA2A variant context rather than a standalone diagnostic result.

biomarker tendency · CC

ADORA2A biomarker tendency

Not used for pathway scoring

rs5751876 CC has no scored directional claim for ADORA2A biomarker tendency.

ADORA2A rs5751876 is scored as a caffeine-response sensitivity tendency, with TT assigned a higher sensitivity score and CC or CT left neutral in this simplified model.

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 places rs5751876 in ADORA2A and lists C and T as the observed alleles on the preferred genomic placement. This supports the C/T genotype labels used here.PMC2745641biomarker association · close proxyA double-blind caffeine challenge study reported that ADORA2A rs5751876 was associated with self-reported anxiety after a moderate caffeine dose, with TT participants showing the highest anxiety response and CC participants the lowest in the full sample. The study also noted that other ADORA2A and DRD2 variants may contribute.PMC3055635biomarker association · loose proxyA larger caffeine-response study reported that caffeine's anxiogenic effect was larger in ADORA2A rs5751876 TT participants, especially among people who usually consumed little or no caffeine. This supports scoring TT as higher caffeine-response sensitivity while leaving CT unscored in this simplified file.PMC8322233review · close proxyA review of adenosine A2A receptor variants summarized rs5751876 TT as repeatedly linked to enhanced caffeine-induced anxiety and other caffeine-response differences. It also describes rs5751876 as a marker within a broader ADORA2A variant context rather than a standalone diagnostic result.

biomarker tendency · CT

ADORA2A biomarker tendency

Not used for pathway scoring

rs5751876 CT has no scored directional claim for ADORA2A biomarker tendency.

ADORA2A rs5751876 is scored as a caffeine-response sensitivity tendency, with TT assigned a higher sensitivity score and CC or CT left neutral in this simplified model.

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 places rs5751876 in ADORA2A and lists C and T as the observed alleles on the preferred genomic placement. This supports the C/T genotype labels used here.PMC2745641biomarker association · close proxyA double-blind caffeine challenge study reported that ADORA2A rs5751876 was associated with self-reported anxiety after a moderate caffeine dose, with TT participants showing the highest anxiety response and CC participants the lowest in the full sample. The study also noted that other ADORA2A and DRD2 variants may contribute.PMC3055635biomarker association · loose proxyA larger caffeine-response study reported that caffeine's anxiogenic effect was larger in ADORA2A rs5751876 TT participants, especially among people who usually consumed little or no caffeine. This supports scoring TT as higher caffeine-response sensitivity while leaving CT unscored in this simplified file.PMC8322233review · close proxyA review of adenosine A2A receptor variants summarized rs5751876 TT as repeatedly linked to enhanced caffeine-induced anxiety and other caffeine-response differences. It also describes rs5751876 as a marker within a broader ADORA2A variant context rather than a standalone diagnostic result.

Common symptoms people report

  • caffeine / stimulant sensitivity can overlap with more persistent symptom patterns
  • marker-driven follow-up may matter more than generic advice
  • mixed responses can make the pathway easier to miss without structured review

Biomarkers to validate

Sleep disruption pattern

Primary follow-up marker for ADORA2A inside caffeine / stimulant sensitivity.

Related pathway markers

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

Where DNA analysis helps

DNA helps decide whether ADORA2A should move caffeine / stimulant sensitivity higher on the follow-up list before broad interventions are assumed.

Example interpretation

ADORA2A can strengthen the case for caffeine / stimulant sensitivity follow-up when the rest of the pathway points in a similar direction.

Suggested validation: Sleep disruption pattern.

What to do next

  • Use Sleep disruption pattern and pathway context before assuming the gene matters in practice.
  • Read ADORA2A alongside the related genes in the same pathway instead of as a standalone result.

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