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Gout Genetic Variants — Unified Index Across the Cascade

Scope

This cascade-stratified catalogue covers genetic variants that drive or modulate gout and hyperuricemia. Detailed genotype-stratified intervention evidence is linked from the rightmost column, including computational analyses of uricase response, intestinal ABCG2, transporter regulation, and gout genomics.

Each variant entry carries an explicit evidence tier. Disagreements in effect direction, allele frequency, or evidence strength remain visible rather than being collapsed into a single estimate.

The rightmost column links each variant to its detailed mechanism and intervention evidence.

Unified summary table — top variants by load-bearing impact

The 12 variants below are high-priority anchors for mechanistic and stratification work. Order is approximate and reflects evidence depth and gout relevance, not raw effect size alone.

# Variant Gene Cascade step Effect Research significance
1 UOX pseudogenization (codons 33, 187 + splice site) UOX Urate degradation (absent in humans) Universal human loss-of-function → no endogenous urate-to-allantoin conversion Explains why exogenous or restored UOX is a candidate urate-disposal mechanism; it does not privilege any delivery modality.
2 rs2231142 (p.Gln141Lys, Q141K) ABCG2 Renal + intestinal urate secretion About 50% lower transport activity for the variant protein in defined in-vitro assays; not an in-vivo per-allele effect Major common genetic risk for gout; pharmacologic rescue precedent exists, but butyrate and chaperone candidates remain unvalidated. COMP-019's unconditional flat-dose UOX response classification is not robust to COMP-044 and supplies no genotype-response prediction.
3 rs2199936 ABCG2 Renal + intestinal urate secretion Intronic; tag SNP for ABCG2 haplotype Reported lead ABCG2 association in the 2025 UK Biobank gout GWAS (Human Observational; PMID 41075270)
4 rs734553 / rs58656183 SLC2A9 (GLUT9) Basolateral renal urate exit Largest per-allele effect on serum urate of any known locus A dominant urate-transporter locus; the selectivity and therapeutic window of partial GLUT9 modulation remain open questions
5 SLC22A12 W258X (rs121907892) SLC22A12 (URAT1) Renal urate reabsorption LOSS-of-function → urate doesn't get reabsorbed → protective (causes RHUC1) Validates the URAT1-inhibitor pharmacology class and informs the siRNA against URAT1 modality. It does not rescue COMP-019's withdrawn flat-dose UOX-response classification or establish a genotype-specific UOX response.
6 HPRT1 LoF (multiple alleles) HPRT1 (Xq26) Purine salvage → de novo synthesis dysregulation LOSS-of-function → Lesch-Nyhan; partial → Kelley-Seegmiller (early-onset gout) The rare-but-illustrative case of urate overproduction from a genetic source; X-linked
7 PRPS1 superactivity (multiple alleles, e.g., D52H, A87T, L129I) PRPS1 (Xq22.3) De novo purine biosynthesis GAIN-of-function → ↑ PRPP → ↑ purine flux → early-onset gout Direct human-genetic anchor for the PRPS chokepoint thesis
8 NLRP3 CAPS variants (R260W, D303N, T348M, others) NLRP3 Inflammasome assembly GAIN-of-function → constitutive IL-1β release (FCAS / MWS / CINCA-NOMID) Validates the anti-IL-1β class (canakinumab, anakinra, rilonacept) and the NLRP3-inhibitor class (dapansutrile, oridonin); informs the NLRP3 exploit map
9 rs10754558 (NLRP3 3′-UTR) NLRP3 Inflammasome assembly Common polymorphism associated with NLRP3 mRNA stability; modest gout-flare-severity signal Common-variant counterpart to CAPS; informs flare-stratification design
10 rs16944 (IL1B −511 C/T) IL1B Inflammasome output (IL-1β production) Common promoter variant; T allele associated with ↑ IL-1β production in some studies Modulates flare amplitude; relevant to anti-IL-1β responder stratification
11 HLA-B*58:01 HLA-B (MHC class I) Pharmacogenetics — allopurinol immunogenicity Carrier → very high allopurinol SCAR / SJS / TEN risk; OR > 500 in Han Chinese (Hung 2005, PMID 15743917) ACR 2020 conditionally recommends testing before allopurinol in patients of Han Chinese, Korean, or Thai ancestry and in African American patients; CPIC contraindicates allopurinol in carriers
12 rs780094 (GCKR) GCKR Comorbidity — fructose / metabolic-syndrome × urate Common variant linking glucokinase regulation to serum urate via fructose handling Mechanistic bridge between fructose-connection.md and the urate axis

Per-category tables and per-variant notes for the load-bearing entries follow below.

Category 1 — Urate transporters

Renal and intestinal urate handling are major determinants of serum urate, and transporter loci dominate the reproducible common-variant signal. The three central transporter genes in this catalogue are ABCG2, SLC2A9 (GLUT9), and SLC22A12 (URAT1). Several additional transporters contribute smaller or less directly characterized signals.

Variant Gene (chr) Cascade step Effect direction Allele frequency Evidence tier Research implication Detailed evidence
rs2231142 (p.Gln141Lys, Q141K) ABCG2 (chr4q22) Renal tubular + intestinal urate secretion The variant protein showed about 50% lower transport activity in defined in-vitro assays through a folding/processing defect; this is not an in-vivo per-allele estimate. The allele is associated with higher serum urate. Frequency varies strongly by ancestry; see abcg2-modulators.md §6 Human Observational (GWAS) + In Vitro mechanism Selected pharmacologic HDAC-inhibitor rescue conditions are demonstrated in vitro. Butyrate-mediated Q141K rescue is unvalidated; its supported route is PPARγ-mediated induction of remaining WT ABCG2. comp-047 found no validated chaperone candidate. Q141K remains an established allopurinol-response stratifier. abcg2-modulators.md
rs2199936 ABCG2 (chr4q22) Renal tubular + intestinal urate secretion Intronic; tag SNP for the ABCG2 risk haplotype Common; LD pattern varies by ancestry Human Observational (2025 UK Biobank gout GWAS; PMID 41075270) Index SNP for genotyping panels that do not include rs2231142 directly; use a source-pinned population extract before panel design gout-pathophysiology.md §"Genomics and GWAS"
rs2231137 (p.Val12Met, V12M) ABCG2 (chr4q22) Renal tubular + intestinal urate secretion; also Jr(a−) blood group phenotype (per UniProt Q9UNQ0) Modest effect on transport activity; partially LD with Q141K in some populations Frequency varies by ancestry; no population percentage is retained without a source-pinned database extract In Vitro + Human Observational (GWAS-associated; mechanism less characterized than Q141K) Secondary ABCG2 marker; complicates pure-Q141K stratification because of LD abcg2-modulators.md
rs734553 SLC2A9 (chr4p16, GLUT9) Basolateral renal urate exit Intronic; one of the most strongly urate-associated common SNPs anywhere in the genome (Vitart 2008, PMID 18327257; Köttgen 2013, PMID 23263486) Common; major allele frequency varies by ancestry Human Observational (GWAS — replicated across multiple cohorts >100k each) Strong human-genetic support for GLUT9 involvement; direct modulation, selectivity, and a safe partial-inhibition window remain unresolved. A defined GLPP preparation changed renal-transporter-expression endpoints in hyperuricemic mice (Animal Model; DOI 10.1039/D2FO02431D), but direct GLUT9 transport and causal attribution were not tested. gout-pathophysiology.md, fructose-connection.md
rs58656183 SLC2A9 (chr4p16, GLUT9) Basolateral renal urate exit Intronic; reported lead SLC2A9 association in the 2025 UK Biobank gout GWAS (PMID 41075270) Common Human Observational (GWAS) Same as rs734553 — GLUT9 effect tagging gout-pathophysiology.md
SLC22A12 W258X (rs121907892, p.Trp258Ter) SLC22A12 (chr11q13, URAT1) Renal urate reabsorption Loss of URAT1 function causes renal hypouricemia type 1; it is protective against hyperuricemia but associated with exercise-induced acute kidney injury and urolithiasis (Ichida 2004, PMID 14747400). Rare globally and enriched in Japanese and Korean populations. Clinical phenotype + In Vitro mechanism Human loss of URAT1 function validates the target direction but does not specify a safe knockdown percentage, exposure, or schedule. Partial-suppression designs require empirical renal-urate, exercise-stress, and stone-risk studies. sirna-urat1-modality.md, gout-pathophysiology.md
SLC22A12 R90H, R434H, V138M, T217M, E298D SLC22A12 (chr11q13, URAT1) Renal urate reabsorption LOSS-of-function missense variants causing RHUC1; reduced or strongly reduced urate transport per UniProt Q96S37 (in vitro transport assays) Rare; some enriched in specific ancestries (e.g., R90H rs121907896 reported in non-East-Asian RHUC1) In Vitro + Human Observational (functional + clinical RHUC1 phenotype) Allelic series demonstrating URAT1 is dosage-sensitive and druggable across the whole transport mechanism, not just one binding pocket sirna-urat1-modality.md
GLUT9 missense variants (e.g., p.Arg380Trp, p.Pro412Arg) SLC2A9 (chr4p16) Basolateral renal urate exit LOSS-of-function → renal hypouricemia type 2 (RHUC2); protective against hyperuricemia but associated with renal urate wasting and possible nephrolithiasis or exercise-induced acute kidney injury (PMID 19926891) Rare In Vitro + Human Observational Supports the urate-reabsorption direction while exposing a safety boundary; it does not establish a therapeutic window for partial GLUT9 inhibition gout-pathophysiology.md
SLC17A1 / SLC17A3 (NPT1 / NPT4) variants SLC17A1/A3 (chr6p22) Apical renal urate secretion Common variants associated with serum urate at modest effect size; some uricosuric-drug interaction Common Human Observational (GWAS) Secondary renal-handling layer; less directly druggable in current pipeline gout-pathophysiology.md
PDZK1 variants PDZK1 (chr1q21) Transporter scaffolding (URAT1, NPT1, OAT4 anchor) Common variants modulating renal transporter complex assembly; modest serum urate signal Common Human Observational (GWAS; mechanism In Vitro) Scaffold target — pharmacological tractability poor; included for mechanistic completeness gout-pathophysiology.md
LRP2 (megalin) variants LRP2 (chr2q31) Receptor-mediated reuptake; broad renal solute handling Modest serum urate association in some GWAS; mechanism mixed Common Mechanistic Extrapolation (GWAS associations; direct urate-specific mechanism less well established than transporter genes above) Background renal context; not a current intervention target —

Do not conflate Q141K measurements. Defined in-vitro studies report reduced variant-protein abundance or transport (Saranko 2013, PMID 23800412; Matsuo 2009, PMID 19952304). A separate meta-analysis reported an association between Q141K carriage and poor allopurinol response (OR 2.43, n=595; Wen 2018, PMID 29342288). That treatment-response estimate is not a gout-risk odds ratio, a serum-urate effect per allele, or evidence for genotype-specific UOX response. Population-specific risk and allele-frequency estimates require their own primary records.

Per-variant note — Q141K is the load-bearing one. Keep three evidence claims separate: butyrate/PPARγ induction of wild-type ABCG2; pharmacologic HDAC-inhibitor rescue of Q141K in vitro; and the unproven proposal that butyrate reproduces that Q141K rescue. Genotype-stratified butyrate work is a falsification design, not a current rescue recommendation.

Category 2 — Urate-production enzymes

Rare genetic overproduction phenotypes are mechanistically illustrative even though they do not describe the full distribution of urate-handling phenotypes in common gout.

Variant Gene (chr) Cascade step Effect direction Allele frequency Evidence tier Research implication Detailed evidence
HPRT1 LoF (multiple alleles) HPRT1 (Xq26.2-q26.3) Purine salvage; LoF re-routes hypoxanthine/guanine into degradation → urate LOSS-of-function → Lesch-Nyhan syndrome (severe, OMIM #300322) or partial-function Kelley-Seegmiller syndrome (early-onset gout, hyperuricemia without neurological features) Rare; X-linked recessive Human Observational (clinical phenotype) Validates that purine salvage failure → urate flux is a quantitatively meaningful axis; relevant to allopurinol/febuxostat use in over-producer phenotypes gout-pathophysiology.md §"Step 1"
PRPS1 superactivity (e.g., p.Asp52His, p.Ala87Thr, p.Leu129Ile) PRPS1 (Xq22.3) PRPP supply for de-novo purine synthesis, purine salvage, and pyrimidine synthesis Gain-of-function variants can increase PRPP supply and are associated with early-onset gout and, in some pedigrees, sensorineural deafness (OMIM #311850) Rare; X-linked Human Observational (clinical phenotype) + In Vitro mechanism Human-genetic support that PRPS1 dysregulation can cause hyperuricemia; it does not establish that partial PRPS suppression is effective or safe prps-purine-biosynthesis-chokepoint.md
XDH (xanthine dehydrogenase / oxidase) variants XDH (chr2p23) Hypoxanthine → xanthine → urate (rate-limiting degradation) LOSS-of-function → xanthinuria (protective against gout but can cause xanthine stones, OMIM #278300); common variants have serum-urate associations Common variants ubiquitous; LoF rare Human Observational (xanthinuria phenotype) + GWAS for common variants Human-genetic support for the XO pathway; source-qualified natural-product XO leads require their own direct assays and safety boundaries gout-pathophysiology.md
ADA (adenosine deaminase) variants ADA (chr20q13) Adenosine → inosine (purine catabolism upstream of XO) Pathogenic LoF can cause ADA-SCID; whether partial ADA modulation changes flux entering the XO → urate pipeline favorably is unresolved LoF very rare; common variants present Human Observational + In Vitro for ADA-SCID; Mechanistic Extrapolation for ADA × gout Open chokepoint question; candidate materials require independent primary sourcing and matched purine-flux plus adenosine-resolution assays. See gout-pathophysiology.md §"ADA". Valerio 1986, PMID 3007108; Morgan 1987, PMID 3436096
G6PC LoF (glucose-6-phosphatase) G6PC1 (chr17q21) G6PC deficiency blocks the terminal glucose-6-phosphate hydrolysis step of gluconeogenesis and glycogenolysis. GSD-Ia is associated with glucose-6-phosphate accumulation, hypoglycemia, lactic acidemia, hyperuricemia, and gout; both increased adenine-nucleotide breakdown and reduced renal urate clearance can contribute. LOSS-of-function → secondary hyperuricemia and gout in some GSD-I patients Rare Human Observational (clinical and metabolic phenotype; PMIDs 2856925, 35219330) Human metabolic anchor showing that altered glucose-6-phosphate handling, hypoglycemia/glucagon responses, ATP breakdown, lactate, and urate clearance can converge on hyperuricemia. It does not validate a single fructose-specific route. fructose-connection.md

Category 3 — UOX (uricase pseudogene) — the universal human variant

This is the special case. The human UOX locus is a pseudogene in every human — not a polymorphism but a fixed loss-of-function state shared across the species. Functional uricase persists in most mammals; Oda et al. place independent hominoid losses in the Miocene (Comparative genomics; PMID 11919282). The exact evolutionary interval is not used as a design parameter here.

Variant Gene (chr) Cascade step Effect direction Allele frequency Evidence tier Research implication Detailed evidence
UOX pseudogenization — nonsense mutations at codons 33 and 187 + aberrant splice site (Wu 1989, PMID 2780565; Oda 2002, PMID 11919282) UOX (chr1p22.3 in humans) Urate → allantoin degradation LOSS-of-function fixed in the human population Allele frequency = 1.0 Clinical physiology + evolutionary genetics Provides the mechanistic rationale for testing exogenous UOX and somatic restoration. The 2025 Georgia State work is limited to CRISPR-edited human hepatocyte cultures and spheroids; in-vivo delivery and clinical restoration are untested. uricase.md, crispr-uricase.md

Important framing. UOX pseudogenization is not a heterogeneous human stratifier: there is no functional-human-UOX comparison group. Exogenous enzyme, gut-local degradation, and somatic restoration are separate hypotheses with different delivery and safety requirements. Evidence for one does not validate another.

Category 4 — Inflammasome assembly / NLRP3

The inflammasome arm gates how much IL-1β a person produces in response to a given MSU crystal load. NLRP3 itself harbors both the rare CAPS gain-of-function variants (clinically severe autoinflammatory disease) and several common polymorphisms with modest gout-related signals.

Variant Gene (chr) Cascade step Effect direction Allele frequency Evidence tier Research implication Detailed evidence
NLRP3 CAPS variants — p.Arg260Trp, p.Asp303Asn, p.Thr348Met, p.Ala441Pro, p.Tyr570Cys, others NLRP3 (chr1q44) Inflammasome assembly GAIN-of-function → constitutive ASC speck formation → constitutive IL-1β release → cryopyrin-associated periodic syndromes (FCAS, MWS, CINCA/NOMID spectrum, OMIM #606416, autosomal dominant) Rare; pedigree-specific Human Observational (clinical phenotype; In Vitro mechanism) Human proof-of-concept that NLRP3 alone is sufficient to drive IL-1β–mediated disease — validates the entire IL-1 inhibitor class (anakinra, canakinumab, rilonacept) and informs the NLRP3-inhibitor class (dapansutrile, oridonin per nlrp3-inhibitor-screen.md) nlrp3-inflammasome.md, nlrp3-exploit-map.md
rs10754558 (NLRP3 3′-UTR) NLRP3 (chr1q44) Inflammasome assembly C/G common variant in 3′-UTR; G allele associated with altered NLRP3 mRNA stability in some reports; gout-flare relevance has mixed replication Common; both alleles substantial-frequency in all major ancestries In Vitro + Human Observational (mixed replication) Common-variant counterpart to CAPS; potentially relevant for flare-stratification research but not a clinical-grade pharmacogenetic marker on its own nlrp3-inflammasome.md
rs35829419 (NLRP3 p.Gln705Lys, Q705K) NLRP3 (chr1q44) Inflammasome assembly Missense at residue 705 (NP_004886.3:p.Gln705Lys per dbSNP); reported as a low-penetrance susceptibility allele for several inflammatory conditions; relevance to gout-flare severity uncertain Frequency varies materially by population; use a current, source-pinned population database before powering a study In Vitro + Human Observational (mixed; dbSNP "benign, conflicting interpretations of pathogenicity") Lower-priority than rs10754558 for stratified analysis; included for catalogue completeness nlrp3-inflammasome.md
NLRP1 / AIM2 variants NLRP1 (chr17p13), AIM2 (chr1q23) Alternative inflammasome platforms (DNA-sensing AIM2, NLRP1 in epithelial / dendritic cells) Various; NLRP1 implicated in vitiligo / autoimmune inflammatory diseases; AIM2 implicated in cytosolic dsDNA sensing — relevance to MSU-driven gout is mostly Mechanistic Extrapolation Common variants present Mechanistic Extrapolation for direct gout role Included for catalogue completeness; gout-specific role is upstream-of-evidence nlrp3-inflammasome.md

Category 5 — Inflammasome priming + IL-1β output

Variants here modulate how much pro-IL-1β is available for the inflammasome to cleave (priming arm) and how strongly downstream TLR4 / MyD88 signaling amplifies the response.

Variant Gene (chr) Cascade step Effect direction Allele frequency Evidence tier Research implication Detailed evidence
rs16944 (IL1B −511 C/T) IL1B (chr2q14) IL-1β priming (transcriptional) Common promoter variant; T allele associated with ↑ IL-1β production in some LPS-stimulation assays (mixed across studies) Common; both alleles substantial-frequency in all major ancestries In Vitro + Human Observational (mixed replication) Candidate flare-amplitude stratifier; no clinical responder rule is established nlrp3-inflammasome.md
rs1143634 (IL1B +3954 C/T, p.Phe105Phe synonymous) IL1B (chr2q14) IL-1β output Synonymous variant in exon 5; T allele reported in some studies as associated with ↑ IL-1β secretion (mechanism uncertain — likely LD with regulatory variant); inconsistent replication Common In Vitro + Human Observational (inconsistent; dbSNP "association, benign") Candidate haplotype marker; no clinical responder rule is established nlrp3-inflammasome.md
rs4986790 (TLR4 p.Asp299Gly, D299G) TLR4 (chr9q33) Inflammasome priming (TLR4 → NF-κB) Missense; the minor allele has been associated with reduced LPS-responsive TLR4 signaling in some in-vitro assays and could in principle dampen NF-κB priming of pro-IL-1β. Direction in gout is mechanistically ambiguous because TLR4 also has roles in clearance. Population frequency and reported allele depend on ancestry and reference strand; use a current source-pinned database before study design In Vitro + Human Observational (mixed for gout specifically) Candidate inflammasome-priming-axis stratifier complement-c5a-gout.md, tnfsf14-gout-target.md
rs4986791 (TLR4 p.Thr399Ile, T399I) TLR4 (chr9q33) Inflammasome priming Missense often co-inherited with D299G in European-ancestry populations Common haplotype with D299G In Vitro + Human Observational Same candidate priming-axis role; gout-specific effect remains unresolved complement-c5a-gout.md
MyD88 variants MYD88 (chr3p22) Inflammasome priming (TLR-axis adapter) Common variants modest; rare gain-of-function variants (e.g., p.Leu265Pro) drive activated B-cell lymphoma — not gout-relevant Common common variants; rare oncogenic GoF Mechanistic Extrapolation for direct gout role Included for catalogue completeness; not a near-term OE intervention target —
CFH Y402H (rs1061170, p.Tyr402His) CFH (chr1q31) Complement regulation; possible relevance to complement-mediated inflammasome priming Common missense AMD-risk variant with established effects on CFH ligand and surface interactions. Human observations in AMD, CRP, and vascular cohorts do not establish a gout association, an MSU-response direction, or a candidate-treatment interaction. Frequency varies by ancestry. Use a current, source-pinned population database extract before designing or powering a cohort analysis. Human Observational + GWAS (AMD and adjacent phenotypes); Mechanistic Extrapolation (gout/MSU relevance) Research conjecture: one or more exact upstream-CP0 candidates may retain activity when CFH function is impaired, but no carrier-specific benefit or response direction is established. Test exact materials in CFH-depleted, replete, and restored serum with MSU activation. A diet-by-genotype association can update only the tested exposure proxy and population hypothesis; it cannot establish or retire the biochemical mechanism. complement-c5a-gout.md §6.3, cfh-dependence hypotheses

Category 6 — Pharmacogenetics relevant to gout treatment

HLA-B*58:01 is an established clinically actionable pharmacogenetic finding in gout management. ACR 2020 conditionally recommends pre-testing in patients of Han Chinese, Korean, or Thai ancestry and in African American patients, while CPIC gives a strong therapeutic recommendation that allopurinol is contraindicated in carriers. Several additional variants affect drugs that may occur in the broader medication context.

Variant Gene (chr) Cascade step Effect direction Allele frequency Evidence tier Research implication Detailed evidence
HLA-B*58:01 HLA-B (chr6p21, MHC class I) Pharmacogenetics — allopurinol immunogenicity Carrier status strongly increases allopurinol-induced SCAR risk through oxypurinol-restricted T-cell activation; Hung 2005 reported OR >500 in Han Chinese (PMID 15743917). Frequency varies substantially within and across ancestry groups. Clinical pharmacogenetics (PharmGKB Level 1A; ACR/CPIC guidance; regulatory labeling) Provides an established genotype–drug interaction and study-design boundary. It does not establish the efficacy or comparative safety of a different urate-lowering modality. gout-pathophysiology.md, gout-clinical-pipeline.md
TPMT variants (e.g., *2, *3A, *3B, *3C) TPMT (chr6p22) Pharmacogenetics — azathioprine metabolism LoF variants → reduced thiopurine S-methyltransferase activity → ↑ azathioprine toxicity (myelosuppression) Frequencies vary by allele and ancestry; use a current source-pinned pharmacogenomic database for an exact population estimate Clinical pharmacogenetics (guideline and genotype–toxicity evidence) Relevant only to patients who also receive thiopurines; not a frontline gout pharmacogenetic marker —
CYP2C9 variants (*2, *3) CYP2C9 (chr10q24) Pharmacogenetics — CYP2C9 substrates in the medication context Reduced metabolism of affected substrate drugs Common Clinical pharmacogenetics for named CYP2C9 substrates; gout-specific relevance depends on the exact drug Medication-context covariate, not a general uricosuric-response marker —
G6PD deficiency (multiple alleles) G6PD (Xq28) Pharmacogenetics — systemic recombinant uricase Loss of G6PD activity can produce severe hemolysis after systemic rasburicase or pegloticase exposure. Frequency varies by ancestry and population. Clinical pharmacogenetics + regulatory warning Establishes a serious safety constraint for the named systemic products. No evidence supports a comparative-safety claim for gut-local, engineered, or somatic UOX; each requires product-specific exposure and safety evidence. crispr-uricase.md

Population boundary. HLA-B*58:01 frequency varies substantially among populations commonly grouped under a single ancestry label. Trial recruitment, power calculations, and assay interpretation should use population-specific data rather than assuming a uniform frequency.

Category 7 — Comorbidity-coupled loci

Variants here are not direct urate-cascade actors but modulate metabolic, lipid, or fructose-handling pathways with downstream urate consequences. These are the loci that link gout to metabolic syndrome.

Variant Gene (chr) Cascade step Effect direction Allele frequency Evidence tier Research implication Detailed evidence
rs780094 (GCKR intron) GCKR (chr2p23) Metabolic-syndrome × fructose × urate Common variant in glucokinase regulatory protein; T allele associated with ↑ serum urate, ↑ triglycerides, ↓ fasting glucose (mixed lipid / glucose / urate pattern). Mechanism likely via altered hepatic fructose handling → AMP → urate flux Common; both alleles substantial-frequency in all major ancestries Human Observational (GWAS — Tin 2019, Köttgen 2013; multi-trait pleiotropy; no intervention evidence) Mechanistic bridge between fructose-connection.md and the urate axis; relevant to dietary-fructose-stratification subagent design fructose-connection.md
APOA1/C3/A4/A5 cluster variants APOA1-A5 (chr11q23) Metabolic syndrome × triglycerides Modest serum urate signal at GWAS scale; shared genetic architecture with hypertriglyceridemia Common Human Observational (GWAS; no intervention evidence) Background-comorbidity loci; not a near-term intervention target —
PNPLA3 p.Ile148Met (rs738409) PNPLA3 (chr22q13) NAFLD risk / lipid droplet biology G allele strongly associated with NAFLD; modest serum urate signal in some GWAS Frequency varies substantially by ancestry; no exact percentage is retained here without a source-pinned population extract Human Observational (GWAS for NAFLD; modest for urate; no intervention evidence) Comorbidity stratifier; relevant when gout intersects with NAFLD treatment —
MLXIPL (ChREBP) variants MLXIPL (chr7q11) Carbohydrate-responsive transcription Common variants associated with serum urate at GWAS scale; mechanism via carbohydrate-responsive lipogenic flux Common Human Observational (GWAS; no intervention evidence) Background fructose-metabolism context fructose-connection.md
HNF1A / HNF4A variants HNF1A (chr12q24), HNF4A (chr20q13) Hepatic transcription / MODY Common variants associated with serum urate at modest effect size; rare LoF cause MODY (maturity-onset diabetes of the young) Common common variants; rare MODY-causing Human Observational (GWAS + clinical phenotype; no intervention evidence) Background; relevant to mixed gout + early-diabetes phenotypes —

Tin et al. 2019 reported a trans-ancestry serum-urate GWAS of 457,690 participants, identifying 183 loci, 147 previously unknown, with gout prediction evaluated in an independent cohort of 334,880 (PMID 31578528). A separate 2025 UK Biobank gout GWAS used 10,474 cases and 140,068 controls and reported primary and sex-stratified analyses (PMID 41075270). These are distinct designs and should not be merged into one locus count or causal hierarchy.

Genotyping requirements for research

Use a variant-specific clinical-grade assay for high-consequence pharmacogenetic enrollment and confirm rare or unexpected calls with an orthogonal method. Exome or genome sequencing is appropriate when the hypothesis concerns a rare coding disorder or an allelic series. Research arrays can support discovery and recruitment planning, but imputed or unconfirmed calls should not define a clinical stratum. Prespecify assay performance, sample provenance, quality-control thresholds, and missing-data handling.

Open questions / coverage gaps

These questions lack sufficient evidence for a current stratification verdict.

  1. Comprehensive SLC22A12 (URAT1) allelic series across non-East-Asian RHUC1 cases. Most published URAT1 LoF variants are characterized in Japanese cohorts (Ichida 2004, Enomoto 2002). The full allelic series in European, South Asian, and African-ancestry RHUC1 patients is less well documented; gnomAD provides exome-frequency data that could anchor a more complete catalogue.
  2. Common-variant NLRP3 polymorphisms and gout-flare severity. rs10754558 and rs35829419 (Q705K) have mixed replication for gout-flare-severity stratification. A dedicated meta-analysis across published gout-flare cohorts would help establish whether these variants justify being a NLRP3-inhibitor responder-stratification marker (relevant to dapansutrile, oridonin development per nlrp3-inhibitor-screen.md).
  3. Polygenic risk score (PRS) calibration for gout across ancestries. Tin 2019's 183 serum-urate loci came from a trans-ancestry analysis, but ancestry composition, effect heterogeneity, and portability still require population-specific evaluation. Stratification experiments may require a validated PRS rather than single-variant indexing.
  4. Q141K response to systemic versus gut-lumen UOX. COMP-019's unconditional flat-dose classification is not robust to COMP-044's tested substrate-occupancy and finite-window diagnostics. COMP-044 supplies no replacement dose, ΔSUA, genotype, physiological regime, efficacy, topology or chassis, production, or safety conclusion. The comp-019 search found no genotype-stratified UOX clinical outcome in its searched sources; Q141K remains a prospective stratification variable rather than a response predictor.
  5. GLUT9 druggability. SLC2A9 has the largest per-allele effect on serum urate of any locus, yet no clinical-grade GLUT9-targeted drug exists. Whether the gap reflects structural/selectivity tractability or clinical prioritization of URAT1 is unresolved.
  6. G6PD deficiency × gut-lumen UOX safety. Comparative safety is unknown. Product-specific systemic exposure, oxidative effects, and hemolysis risk require empirical measurement; compartmental intent is not a safety result.

  7. East-Asian-cohort Q141K × dietary-fiber RCT. The dated 2026-05-19 PubMed and citation-chain scan did not identify a Q141K-stratified fiber or butyrate-supplementation RCT. That scan did not cover authenticated CNKI, WanFang, J-STAGE, or CiNii, so it establishes a bounded search gap rather than universal absence. A current multilingual scan plus a source-pinned population-frequency extract is required before cohort design. See abcg2-modulators.md §6.

  8. W258X-homozygote lifetime EI-AKI risk. Despite W258X being intensively studied across ~31,000 Japanese individuals (Iwai, Taniguchi, Tabara 2014, Hamajima 2011, Wakida 2008), the lifetime exercise-induced AKI incidence in homozygotes vs heterozygotes is not quantified in any published source. This is a tractable Japanese-cohort epidemiology study and a load-bearing constraint for the URAT1-siRNA modality safety case at sirna-urat1-modality.md.

  9. HLA-B*58:01-positive febuxostat prospective safety cohort. The sources currently cited on this page do not establish a large prospective cohort tracking SCAR incidence among HLA-B*58:01-positive febuxostat recipients. A current multilingual, registry-linked search is required before treating that as a live evidence gap. Any cohort found would need exact exposure, ancestry, comparator, ascertainment, and outcome definitions before informing a substitution hypothesis.

  10. East-Asian TCM-era gout cohorts. The 2026-05-19 multilingual scan did not include authenticated CNKI, WanFang, J-STAGE, or CiNii coverage. Regional sub-cohort analyses and TCM-context intervention studies may therefore be underrepresented.

Cross-references

Variant-specific mechanisms, rescue strategies, and intervention designs are linked from the "Detailed evidence" column. The genotype-informed workflow formalizes the variant → pathway vulnerability → bypass-intervention framework.