rs7125552 — EMSY EMSY Haplotype Partner Allergy Variant

Intronic EMSY variant that defines the high-risk haplotype at 11q13.5; the G allele is required for the rs7927894 T risk allele to exert its effect on atopic dermatitis and allergic rhinitis — without G at rs7125552, the rs7927894 T risk effect is abolished

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EMSY Haplotype Structure — The Hidden Context Behind the 11q13.5 Allergy Signal

The well-known rs7927894 T allele at chromosome 11q13.5 is one of the most replicated atopic dermatitis susceptibility signals in the human genome — but the full story of this locus requires a second variant. Ponińska et al. (2017)11 Ponińska et al. (2017)
Ponińska et al., PLoS One 2017 — participants from the ECAP (Epidemiology of Allergic Diseases in Poland) cohort including subjects with atopic dermatitis, atopic asthma, and persistent allergic rhinitis plus matched controls showed that the risk conferred by rs7927894 T is not carried by the T allele alone: it is haplotype-dependent, and specifically requires the G allele at rs7125552 to manifest. Without G at this position, the rs7927894 T allele's association with atopic dermatitis and allergic rhinitis disappears.

This kind of haplotype dependency is clinically meaningful: it means that genotyping rs7927894 alone gives an incomplete picture of this locus's risk contribution. rs7125552 is the contextual marker that defines whether the risk haplotype is complete.

The Mechanism

rs7125552 sits at position 76,500,050 on chromosome 11 (GRCh38, NC_000011.10:g.76500050G>A), approximately 90 kilobases upstream of rs7927894 (position 76,590,272) within the EMSY gene body. Both variants lie within the same topologically associating domain (TAD) that encompasses EMSY and LRRC3222 EMSY and LRRC32
EMSY (C11orf30) is a chromatin regulatory protein that epigenetically suppresses skin barrier genes including filaggrin and ceramide synthesis enzymes; LRRC32 encodes GARP, a TGF-β receptor complex component on regulatory T cells — both genes contribute to allergic susceptibility through distinct mechanisms at the same genomic address.

The Evidence

The Ponińska et al. haplotype analysis across ECAP cohort participants is the key evidence for this variant's role. In single-SNP analysis, rs7125552 showed no significant independent association with atopic dermatitis (OR=1.08, p=0.49). Its importance emerges at the haplotype level: the TG haplotype (T at rs7927894, G at rs7125552) carried an OR of 1.92 (p=0.00021) for atopic dermatitis and OR=1.32 (p=0.023) for persistent allergic rhinitis. In contrast, the TA haplotype (T at rs7927894, A at rs7125552) had OR=1.12 (p=0.36) — statistically indistinguishable from no effect. This demonstrates that rs7125552 G is not merely a passenger — it is structurally required for the allergy risk haplotype to be functional.

The 11q13.5 locus was confirmed as a key atopic march locus in a 2015 meta-analysis33 2015 meta-analysis
Marenholz et al., Nat Commun 2015 and in the large Paternoster et al. meta-GWAS44 Paternoster et al. meta-GWAS
Nat Genet 2011 — 5,606 cases and 20,565 controls in discovery; 5,419 and 19,833 in replication. These studies replicate the 11q13.5 association; the Ponińska work adds the mechanistic detail that the haplotype — not a single SNP — is the functional unit.

Practical Actions

The actionable implications of rs7125552 mirror those of its haplotype partner rs7927894, because the two variants define the same functional unit. Carriers of G at rs7125552 who also carry T at rs7927894 are on the complete high-risk haplotype (TG), with an approximately twofold increased risk for atopic dermatitis.

Carriers of AA at rs7125552 represent the minority (approximately 9%) who carry two copies of the haplotype-breaking A allele — these individuals appear protected from the rs7927894 T risk effect even if they carry T alleles at that position.

Interactions

The central interaction is the cis-haplotype with rs7927894: these two variants at 11q13.5 are best interpreted as a functional unit rather than as independent signals. The high-risk haplotype is T (rs7927894) + G (rs7125552); the protective configuration requires A at rs7125552.

Beyond the cis interaction, the 11q13.5 locus interacts with filaggrin loss-of-function variants (rs61816766 and rs12123821) through converging effects on skin barrier integrity. The IL13 variant rs20541 operates from the immune activation side of the same atopic phenotype and compounds the total risk carried by 11q13.5 haplotype carriers.

Genotype Interpretations

What each possible genotype means for this variant.

AA Haplotype-Breaking Genotype Beneficial

Two A alleles eliminate the rs7927894 T allele risk effect at 11q13.5

You carry two copies of the A allele at rs7125552. This is the minority genotype — approximately 9% of people of European descent share it. The A allele at this position breaks the high-risk haplotype at the 11q13.5 atopic disease locus: the rs7927894 T risk allele effect on atopic dermatitis and persistent allergic rhinitis requires G at rs7125552 to be present. With two A alleles, neither of your chromosomes carries the complete risk haplotype at this locus, regardless of your rs7927894 genotype. Haplotype analysis in the ECAP cohort found the TA haplotype (T at rs7927894 + A at rs7125552) had OR=1.12 (p=0.36) — not statistically different from no risk increase.

AG Partial Haplotype Carrier Intermediate

One G allele — one chromosome can form the high-risk 11q13.5 haplotype

The haplotype-dependent nature of this variant means your individual genotype at rs7125552 must be interpreted alongside your rs7927894 genotype. If your rs7927894 result shows CT or TT, and if the T allele is on the same chromosome as your G here, you carry one copy of the TG risk haplotype. This is the configuration that was associated with atopic dermatitis (OR=1.92, p=0.00021) in the ECAP cohort. Carriers of one TG haplotype have intermediate risk — below TG homozygotes but above those with no TG chromosomes.

GG Full Risk Haplotype Permissive High Risk

Two G alleles — both chromosomes are permissive for the high-risk 11q13.5 atopic disease haplotype

The practical significance of GG at rs7125552 depends on your rs7927894 genotype: if you carry T at rs7927894 (CT or TT), your T allele(s) are on the risk haplotype with full penetrance. If you are CC at rs7927894, the rs7125552 GG status is permissive but the triggering allele (rs7927894 T) is absent, so this variant confers no additional risk through the haplotype mechanism.

For individuals who are GG at rs7125552 and also carry T at rs7927894, the combined haplotype picture is: every T chromosome also carries G — the maximally risk-permissive configuration. Being GG means there is no haplotype-breaking A allele on either chromosome to dampen the effect.