rs2298566 — SNX19

Missense variant in sorting nexin 19; the A allele was associated with elevated coronary heart disease risk in a prospective cohort study and confirmed as one of five common risk variants in the ARIC validation

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SNX19 — The Endolysosomal Positioning Factor Linked to Coronary Risk

Deep inside every cell, a network of membrane-bound organelles sorts, degrades, and recycles proteins and lipids11 sorts, degrades, and recycles proteins and lipids
Endolysosomes are the cell's recycling centers; their positioning determines how efficiently cargo is processed. SNX19 — Sorting Nexin 19 — is a molecular tether that anchors endolysosomes to the endoplasmic reticulum (ER), keeping them clustered near the cell nucleus rather than scattered throughout the cytoplasm. A common missense variant in SNX19, rs2298566, has been associated with elevated coronary heart disease risk in prospective cohort data.

The Mechanism

SNX19 bridges two organelle systems: its two N-terminal transmembrane domains embed the protein in the ER membrane, while its PX domain22 PX domain
Phox Homology domain — a phosphoinositide-binding module found across the sorting nexin family binds phosphatidylinositol 3-phosphate (PI3P) on endolysosomal membranes. Regulatory PXA and PXC flanking domains act as a molecular governor, preventing excessive tethering under normal conditions. The variant rs2298566 is a missense change that substitutes leucine at position 878 with arginine (p.Leu878Arg) in the major isoform — a significant amino acid property change within the regulatory C-terminal region.

When endolysosomal positioning is disrupted — as demonstrated by Saric et al., Nature Communications 202133 Saric et al., Nature Communications 2021
NIH National Institute of Child Health and Human Development using SNX19-knockout cells — endolysosomes disperse throughout the cytoplasm and exhibit increased motility.

The precise molecular bridge between altered SNX19 tethering and coronary artery disease risk is not yet established at the mechanistic level. SNX19's role in endolysosomal positioning is consistent with the broader evidence that lysosomal dysfunction contributes to macrophage foam cell formation, cholesterol efflux impairment, and vascular inflammation — central processes in atherosclerosis.

The Evidence

The primary evidence for rs2298566's cardiovascular association comes from the Atherosclerosis Risk in Communities (ARIC) study. Bare et al., Genetics in Medicine 200744 Bare et al., Genetics in Medicine 2007
Cohort study with Cox proportional hazards modeling, 9,129 white participants, median 13-year follow-up assembled five variants — rs20455 (KIF6), rs3900940 (MYH15), rs7439293 (PALLD), rs2298566 (SNX19), and rs1010 (VAMP8) — each of which had prior CHD associations. Among participants with a high composite genetic risk score (the top 4% of carriers), the hazard ratio for incident CHD was 1.57 (95% CI 1.21–2.04; p = 0.001) after adjustment for traditional cardiovascular risk factors; bootstrap validation suggested HR 1.43 in external populations.

It is important to note the limitations. The published effect size is for the composite five-SNP score — individual effect sizes for rs2298566 alone are not reported in the abstract, and its specific contribution to the composite has not been disaggregated in the literature retrieved. The KIF6 variant (rs20455), which was the most prominent member of this panel, later failed to replicate across large independent cohorts. Whether rs2298566 independently replicates at genome-wide significance has not been established in a GWAS meta-analysis. The evidence level is accordingly rated moderate rather than strong.

Practical Actions

Monitoring the early biomarkers of cardiovascular risk — lipids and vascular inflammation — allows timely intervention at the stage before clinical coronary disease develops.

There are no specific drug-gene interactions or nutrient interventions documented for rs2298566 in the current literature. Statin response differential has been proposed for genes in this five-SNP panel but has not been established for SNX19 specifically.

Interactions

rs2298566 was studied as one of five CHD-associated variants alongside rs20455 (KIF6), rs3900940 (MYH15), rs7439293 (PALLD), and rs1010 (VAMP8). The composite risk score framework suggests additive rather than synergistic effects across these loci, as each gene operates through largely distinct mechanisms (cytoskeletal dynamics, actin scaffolding, vesicle trafficking).

Genotype Interpretations

What each possible genotype means for this variant.

CC Normal

Common SNX19 genotype — no elevated coronary risk from this variant

You carry two copies of the C allele at rs2298566, the most common genotype at this position globally. Approximately 58% of people share this CC genotype. Population frequency data from the ALFA dataset (dbSNP) show the C allele at roughly 76% globally, making CC the predominant configuration across all major ancestry groups. The coronary heart disease association documented in the ARIC cohort applies to carriers of the A risk allele, not to you.

AC Intermediate

One copy of the SNX19 A risk allele — modestly elevated coronary risk

You carry one copy of the A allele at rs2298566. About 36% of people share this AC genotype. The A allele at rs2298566 was included as a confirmed coronary heart disease risk variant in the Atherosclerosis Risk in Communities (ARIC) prospective cohort study, where a five-SNP composite panel including this variant was associated with hazard ratio 1.57 for incident CHD in those with high genetic risk scores. The individual effect of one A allele at this locus has not been precisely quantified in isolation, but the additive inheritance pattern suggests a proportionally intermediate risk relative to the AA homozygote.

AA High Risk

Two copies of the SNX19 A risk allele — the highest-risk genotype at this locus

You carry two copies of the A allele at rs2298566, the rarest and highest-risk configuration at this locus. Only about 6% of people globally carry this AA genotype. The A allele at rs2298566 was confirmed as a coronary heart disease risk variant in the ARIC prospective cohort study (9,129 white participants, 13-year follow-up), where it was included in a five-SNP panel associated with HR 1.57 for incident CHD in the highest-risk group. The evidence is based on cohort data and a composite risk score; individual-variant effect size has not been independently replicated at genome-wide significance.