rs7130588 — LRRC32

Regulatory variant near LRRC32 (GARP) on chromosome 11q13.5; the G allele increases LRRC32 expression and is associated with elevated risk of atopic asthma, atopic dermatitis, and the eczema-to-asthma progression (atopic march)

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LRRC32 (GARP) — The Tolerance Gate at the 11q13.5 Locus

On chromosome 11q13.5 sits a stretch of regulatory DNA that, in people carrying the G allele at rs7130588, subtly tips the balance of the immune system toward allergic reactivity. The gene controlled by this region, LRRC32, encodes GARP (Glycoprotein A Repetitions Predominant)11 GARP (Glycoprotein A Repetitions Predominant)
GARP is a surface receptor expressed on activated regulatory T cells (Tregs); it docks latent TGF-β on the Treg cell surface, where TGF-β can be released in a controlled fashion to suppress nearby immune cells — a critical molecule in the suppressive machinery of regulatory T cells (Tregs). When GARP function is altered, the Treg-mediated braking on allergic inflammation weakens, and atopic diseases become more likely.

The Mechanism

GARP is a transmembrane receptor expressed exclusively on activated Tregs (and platelets). Its core job is to anchor the latent TGF-β1 complex — the "sleeping" form of this immunosuppressive cytokine — on the cell surface. Surface-tethered latent TGF-β can be activated locally, delivering targeted suppression to nearby effector T cells, dendritic cells, and B cells without flooding systemic circulation with active TGF-β. This spatial precision is what makes GARP-mediated tolerance so important: it allows Tregs to dampen Th2-skewed responses in peripheral tissues like the airway and skin while leaving systemic immunity intact.

rs7130588 lies in a regulatory (non-coding) region approximately 10 kb upstream of the LRRC32 promoter. A closely linked causal candidate, rs6592645 (in complete linkage disequilibrium with rs7130588), falls within an enhancer element that physically loops to the LRRC32 promoter. Luciferase reporter assays22 Luciferase reporter assays
A standard lab test where the regulatory region controls a bioluminescent reporter gene; more light = more transcriptional activity from that sequence confirmed that the A allele of rs6592645 (the rs7130588-G-linked haplotype) drives higher enhancer activity than the G allele, via preferential binding of the transcription factor TCF3. LRRC32 mRNA levels are correspondingly elevated in lung tissue of asthma patients in a genotype-dependent manner.

The counterintuitive implication: higher GARP expression might be expected to enhance Treg suppression and protect against allergy. The biology, however, is more complex. Elevated GARP may alter the balance between membrane-bound and soluble GARP isoforms, the ratio of latent-to-active TGF-β at the Treg surface, or Treg activation thresholds in ways that impair rather than enhance tolerance in allergic tissue contexts. The net clinical observation is unambiguous: the G-risk allele associates with more atopic disease, not less.

The Evidence

The sentinel discovery came from Ferreira et al. in the Lancet33 Ferreira et al. in the Lancet
Australian Asthma Genetics Consortium GWAS, 57,800 participants including 2,669 asthmatics and 4,528 controls in the discovery stage plus 25,358 in replication (2011): rs7130588 reached genome-wide significance (OR 1.09, p=1.8×10⁻⁸) for overall asthma, with a stronger signal for atopic asthma specifically (OR 1.33 for atopic status among asthmatics, p=7×10⁻⁴). The authors concluded the locus "directly increases the risk of allergic sensitisation which, in turn, increases the risk of subsequent development of asthma."

The GWAS Catalog records two subsequent associations at this variant: OR 1.29 (95% CI 1.20–1.38, p=4×10⁻¹³) and OR 1.242 (95% CI 1.17–1.31, p=2×10⁻⁹) in larger replication efforts, confirming and strengthening the original signal.

Beyond asthma, the LRRC32 locus is a shared risk locus across the atopic triad. Weidinger et al.44 Weidinger et al.
GWAS of childhood atopic dermatitis, 1,563 European cases and 4,054 controls with replication in a second cohort (2,286 cases, 3,160 controls) (2013) confirmed the proximal LRRC32 region at genome-wide significance for atopic dermatitis. Most tellingly, Marenholz et al.55 Marenholz et al.
Meta-analysis of 12 populations, 2,428 cases of the "atopic march" phenotype (eczema followed by asthma), 17,034 controls (2015) confirmed LRRC32/C11orf30 as one of seven loci driving the progression from infantile eczema to childhood asthma — the classic atopic march. The locus sits at the intersection of all three major atopic phenotypes: eczema, allergic asthma, and (via the atopic march pathway) allergic rhinitis.

The functional direction — that GARP is genuinely causal, not just a passenger — is supported by a humanized mouse model study66 humanized mouse model study
Mice engrafted with human PBMCs from birch-pollen sensitized donors; treatment with soluble GARP reduced airway hyperresponsiveness, neutrophil and macrophage influx, and mucus-producing goblet cells; effect abolished by anti-TGF-βRII antibody in which exogenous soluble GARP reduced allergic airway inflammation in a TGF-β receptor-dependent manner. Separately, a clinical study found that children who outgrow food allergy have significantly higher GARP expression on peripheral blood mononuclear cells compared with those who do not (p=0.005), establishing GARP as a marker — and potentially a driver — of immune tolerance acquisition.

Practical Actions

The G allele's risk is primarily expressed in the context of atopic sensitization. G-allele carriers who already have one atopic condition (eczema, food allergy, or allergic rhinitis) face meaningfully elevated risk of asthma development — the atopic march phenotype. Early allergist evaluation and proactive management of existing atopic conditions can interrupt this progression. Aeroallergen immunotherapy, which directly raises functional Treg activity and GARP expression, is the intervention most biologically aligned with this locus's mechanism.

For GG homozygotes (approximately 11% of people of European descent), the cumulative risk elevation is additive and warrants baseline spirometry and exhaled nitric oxide (FeNO) measurement to detect subclinical airway inflammation before clinical asthma develops.

Interactions

The LRRC32 locus partially overlaps with C11orf30 (EMSY), which is itself an independent asthma and eczema risk gene; fine-mapping distinguishes the two signals, but in population data they travel together on 11q13. rs6592645, the likely causal variant in full LD with rs7130588, is the preferred candidate for functional follow-up. rs3781700 (nearby in this region) has been identified with OR ~1.054 for atopic dermatitis in large GWAS, representing additional independent variation at the locus.

Compound effects with PTPN22 rs2476601 (R620W), a T-cell activation threshold variant, are plausible given both genes influence regulatory T cell function, but no formal gene-gene interaction study has yet been published.

Genotype Interpretations

What each possible genotype means for this variant.

AA Non-risk Genotype Normal

Common, low-risk genotype at the LRRC32 locus; no elevated atopic disease susceptibility from this variant

You carry two copies of the A allele at rs7130588 — the reference and common genotype at this locus. Approximately 45% of people share this genotype globally; it is even more prevalent in East Asian populations, where the G risk allele runs at only ~8% frequency. Your LRRC32 regulatory region does not carry the enhancer-activating haplotype linked to elevated atopic asthma and eczema risk. This genotype does not contribute to GARP-mediated dysregulation of Treg-TGF-β tolerance at this locus.

AG One Risk Allele Intermediate

One copy of the G risk allele — modestly elevated risk of atopic asthma and eczema-to-asthma progression

The 11q13.5 locus is a shared susceptibility region for all three major atopic phenotypes: eczema, atopic asthma, and the eczema-to-asthma atopic march. Heterozygous AG carriers have one copy of the enhancer-active haplotype; functional studies suggest LRRC32 transcription is intermediate relative to AA and GG homozygotes. The clinical risk elevation from a single G allele is modest at the population level but is amplified when combined with other atopic susceptibility variants (FLG loss-of-function, IL4 pathway variants) or with existing atopic sensitization.

The atopic march phenotype — progression from infant eczema through food allergy to allergic asthma by school age — is precisely the phenotype this locus most strongly influences. Early intervention in eczema and food allergy can interrupt this progression regardless of genotype, but G-allele carriers have genetic reason to be proactive.

GG Two Risk Alleles High Risk

Two copies of the G risk allele — elevated risk of atopic asthma, atopic dermatitis, and eczema-to-asthma progression

The GG genotype at rs7130588 represents the highest-risk configuration at the LRRC32 locus. Functional studies demonstrate that the G-risk haplotype drives elevated LRRC32 transcription through an enhancer loop involving the transcription factor TCF3. The downstream effect — after accounting for the complex relationship between GARP surface expression, soluble GARP levels, and the ratio of latent-to-active TGF-β at Treg surfaces — is a net reduction in effective peripheral immune tolerance, particularly in mucosal surfaces.

This variant's risk is phenotype-specific: it does not robustly associate with non-atopic (intrinsic) asthma, which has a different genetic architecture. It is most predictive in individuals with atopic background — positive skin prick tests, elevated specific IgE, eczema, or food allergy. GG carriers in this atopic context have meaningfully elevated lifetime asthma risk and are the primary population for proactive monitoring.

Children with high GARP expression who develop allergic tolerance (e.g., outgrowing food allergy) may paradoxically have better outcomes in the long run — some clinical data suggest GARP correlates with tolerance acquisition in responders to immunotherapy. However, the population-level GWAS signal clearly places the G allele on the risk side of the balance, making proactive evaluation appropriate.