rs6757908 — EIF2AK3-AS1

Rare intronic variant in EIF2AK3-AS1, an antisense long non-coding RNA that regulates expression of EIF2AK3 (PERK), the kinase mediating the endoplasmic reticulum unfolded protein response; PERK pathway activation is documented in endometriotic tissue, linking ER stress to ectopic lesion survival and ovarian damage in endometriosis

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EIF2AK3-AS1 and the PERK Stress Pathway in Endometriosis

PERK (EIF2AK3) is one of three master sensors of the endoplasmic reticulum stress response. When misfolded proteins accumulate in the ER — driven by inflammatory signals, hypoxia, or oxidative damage — PERK phosphorylates eIF2α to temporarily halt protein synthesis while activating selective transcription factors that coordinate cell survival or death. This unfolded protein response (UPR) is a double-edged switch: short-term PERK activation is cytoprotective, but chronic activation shifts cells toward apoptosis.

rs6757908 is a rare intronic variant in EIF2AK3-AS1, an antisense long non-coding RNA transcribed across the EIF2AK3 locus on chromosome 2. Antisense lncRNAs commonly regulate their sense-strand gene through chromatin remodeling, transcriptional interference, or post-transcriptional mechanisms. EIF2AK3-AS1 may therefore influence PERK expression or splicing — though the specific function of this lncRNA and any effect of rs6757908 on it have not yet been characterized experimentally.

Important note on gene attribution: This SNP's task brief described it as a GREB1 variant. This is incorrect: rs6757908 maps to chromosome 2 position 88,511,708 (GRCh38), which lies within EIF2AK3-AS1. The GREB1 gene occupies chromosome 2 positions 11,482,888– 11,642,788 — approximately 77 Mb upstream. The canonical GREB1 endometriosis locus is rs13394619, which is catalogued separately. This entry addresses rs6757908 on its own genomic and biological merits.

The Mechanism

The peritoneal microenvironment in endometriosis is rich with pro-inflammatory cytokines, reactive oxygen species, and hypoxic signals — all potent inducers of ER stress. In this setting, phospho-PERK is elevated in ectopic glandular and stromal cells, particularly during the late proliferative phase11 phospho-PERK is elevated in ectopic glandular and stromal cells, particularly during the late proliferative phase
Ekiz-Yilmaz et al. Reproductive Biomedicine Online, 2021. Peritoneal fluid from women with endometriosis rapidly increases p-PERK and p-IRE1 levels in normal endometrial stromal cells within 10–60 minutes of exposure — indicating that the disease environment actively induces ER stress in adjacent tissue.

In the ovary, granulosa cells from endometrioma-affected follicles show elevated phospho-PERK, phospho-IRE1, and UPR-associated mRNAs22 granulosa cells from endometrioma-affected follicles show elevated phospho-PERK, phospho-IRE1, and UPR-associated mRNAs
Kunitomi et al. Molecular Human Reproduction, 2020. ER stress-mediated apoptosis of granulosa cells is a likely mechanism by which endometriosis reduces ovarian reserve — connecting the PERK pathway to the fertility consequences of the disease, not just to lesion biology.

That the PERK axis is functionally relevant to endometriosis is reinforced by therapeutic experiments: inducing ER stress pharmacologically via chrysin activates the GRP78-PERK-eIF2α pathway and drives preferential apoptosis of endometriotic cells33 inducing ER stress pharmacologically via chrysin activates the GRP78-PERK-eIF2α pathway and drives preferential apoptosis of endometriotic cells
Ryu et al. Journal of Cellular Physiology, 2019, establishing PERK modulation as a candidate therapeutic target in the disease.

EIF2AK3-AS1 antisense transcription across the PERK gene could theoretically tune EIF2AK3 expression level — and thereby the threshold at which ER stress triggers survival versus death in ectopic endometrial cells. Whether rs6757908 alters this regulatory function is unknown; no functional studies of this specific variant have been published.

The Evidence

rs6757908 itself has no published GWAS associations in any major catalog (EBI GWAS Catalog, ClinVar, dbSNP publications list). No PubMed papers index this rsid. Its G allele is extremely rare: approximately 0.9% globally, essentially absent in Europeans (~0.1%) and East Asians (~0%), and most frequent in individuals of African ancestry (~3.5%). The extreme rarity makes GWAS discovery statistically near-impossible with current cohort sizes.

The evidence linking this variant to endometriosis is therefore entirely inferential — resting on pathway biology (PERK is activated in endometriotic tissue; EIF2AK3-AS1 may regulate EIF2AK3 expression; this variant lies within EIF2AK3-AS1) rather than direct genetic association. Evidence level: emerging.

Practical Implications

Given the complete absence of direct genetic evidence, clinical interpretation must be cautious. Heterozygous AG carriers hold one copy of a rare variant near a gene whose protein is activated in endometriotic tissue. This biological context warrants symptom vigilance without elevating concern beyond what the evidence supports. The most defensible approach is to use this result alongside the well-validated endometriosis loci in the genetic profile rather than interpreting it in isolation.

Interactions

rs13394619 (GREB1): The canonical GREB1/2p25.1 endometriosis locus operates through estrogen-driven GREB1 amplification of ectopic tissue proliferation — a distinct pathway from PERK-mediated ER stress. Both estrogen signaling and ER stress converge on ectopic lesion survival, but through independent mechanisms. No formal interaction has been studied between these loci, and no compound action is proposed at this evidence level.

Genotype Interpretations

What each possible genotype means for this variant.

AA Common Genotype Normal

Common genotype — no copies of this rare EIF2AK3-AS1 variant

You carry two copies of the A reference allele at rs6757908. This is the common genotype, shared by approximately 98% of people globally. No published evidence associates this genotype with increased risk of endometriosis or any reproductive condition.

The PERK/EIF2AK3 pathway is biologically relevant to endometriosis regardless of this result — but at this specific variant you carry no additional genetic signal beyond population baseline.

AG Rare Variant Carrier Carrier

One copy of the rare EIF2AK3-AS1 variant — PERK pathway biology is plausible but direct evidence is limited

The G allele at rs6757908 sits in an intron of EIF2AK3-AS1, an antisense long non-coding RNA that potentially regulates EIF2AK3 expression. Antisense lncRNAs can modulate their sense-strand gene's transcription, splicing, or translation — but the specific function of EIF2AK3-AS1 and any effect of this variant on PERK expression have not been characterized experimentally.

The biological plausibility of PERK pathway involvement in endometriosis is well established: phospho-PERK is elevated in ectopic lesions; peritoneal fluid from endometriosis patients acutely induces p-PERK in endometrial stromal cells; and pharmacological ER stress induction preferentially kills endometriotic cells. PERK activation in ovarian granulosa cells also links ER stress to reduced ovarian reserve, a key fertility consequence of endometriosis. A gene with a biological role in this pathway is plausibly relevant — but biological plausibility is not direct evidence.

rs6757908 was not found in the EBI GWAS Catalog or ClinVar. No PubMed publications index this rsid. The G allele's extreme rarity (~0.9% globally) means it is statistically very difficult to study in GWAS-scale cohorts. Treat this result with appropriate uncertainty and in the context of established endometriosis risk loci.

GG Homozygous Rare Variant Homozygous

Two copies of the rare EIF2AK3-AS1 variant — extremely uncommon; evidence is very limited

GG homozygosity at rs6757908 is extraordinarily rare. Under Hardy-Weinberg equilibrium at the global G allele frequency of ~0.9%, GG homozygotes represent approximately 1 in 12,000 individuals globally. In European populations where the G allele frequency is ~0.1%, GG homozygotes are essentially absent.

The variant is located in EIF2AK3-AS1, an antisense regulatory lncRNA for PERK/EIF2AK3, in an intronic region with no characterized functional consequence. PERK activation is documented in endometriotic tissue, and two copies of a variant potentially affecting EIF2AK3 expression could theoretically alter PERK baseline activity — but this remains entirely speculative given the complete absence of functional or clinical genetic data.

Interpret this result with caution and in the broader context of established endometriosis risk loci that have direct GWAS evidence.