Expressive

rs10755578 (LPA/SLC22A3): Coronary Artery Disease

Key takeaways

  • rs10755578 is in the SLC22A3-LPAL2-LPA gene cluster, a region identified as a coronary artery disease susceptibility locus
  • This heart disease association was missed by standard single-SNP genome-wide studies and only found through haplotype analysis
  • The ALT allele is linked to higher SLC22A3 expression across multiple brain regions, skin, tibial nerve, and testis
  • GTEx data from 953 donors shows statistically robust expression effects, with p-values as low as 4.4e-22 in tibial nerve

Key takeaways

  • rs10755578 is located in the SLC22A3-LPAL2-LPA gene cluster, a region identified as a coronary artery disease susceptibility locus
  • This heart disease association was invisible to standard single-SNP genome-wide studies and was only found through haplotype analysis, which tests combinations of nearby variants together
  • The ALT allele is linked to higher SLC22A3 expression across multiple brain regions, skin, tibial nerve, and testis
  • GTEx data from 953 donors shows statistically robust expression effects, with p-values as low as 4.4e-22 in tibial nerve

What the research says A genome-wide haplotype association study identified the SLC22A3-LPAL2-LPA cluster (three neighboring genes) as a strong susceptibility locus for coronary artery disease (CAD, a condition in which the arteries supplying the heart become narrowed). This locus had not been detected in prior genome-wide association studies that tested each genetic variant individually; the CAD signal appears only when nearby variants are evaluated together as a haplotype, a set of variants inherited as a unit on the same chromosome. Independent expression-QTL data from GTEx v11 (953 donors, testing whether rs10755578 influences how much a nearby gene is expressed in different tissues) show that the ALT allele is consistently associated with increased SLC22A3 expression across eight tissues, with association p-values ranging from 3.0e-12 in brain frontal cortex to 4.4e-22 in tibial nerve GTEx Portal.

Reported associations

  • Coronary artery disease (CAD): The haplotype spanning this locus was identified as a strong CAD susceptibility signal in a genome-wide haplotype association study; specific effect sizes for rs10755578 were not provided in the available study text.
  • SLC22A3 gene expression (brain, skin, nerve, testis): The ALT allele is associated with increased SLC22A3 expression in Brain Frontal Cortex BA9 (slope +0.37, p=3.0e-12), Brain Caudate basal ganglia (slope +0.35, p=9.3e-15), Brain Putamen basal ganglia (slope +0.33, p=3.4e-11), Brain Cortex (slope +0.32, p=2.4e-10), Skin Sun-Exposed Lower Leg (slope +0.36, p=3.8e-19), Skin Not Sun-Exposed Suprapubic (slope +0.30, p=1.0e-11), Tibial Nerve (slope +0.18, p=4.4e-22), and Testis (slope +0.26, p=3.1e-13) GTEx Portal.

Evidence quality The CAD association derives from a single genome-wide haplotype association study (Tregouet et al., Nature Genetics, 2009), which was specifically designed to capture locus-level signals that single-SNP GWAS methods miss. The available study text does not report a sample size, p-value, or odds ratio specific to rs10755578, which limits direct assessment of the signal's magnitude. No replication studies are present among the provided sources, so the CAD finding should be treated as preliminary. The GTEx eQTL associations are drawn from 953 donors across eight independently analyzed tissues, with highly significant p-values consistent across brain regions, skin, nerve, and testis, which strengthens confidence in the SLC22A3 expression effect. These eQTL findings describe gene-expression regulation and do not directly establish disease causation.

Tissue-specific expression effects

  • SLC22A3: The ALT allele is associated with increased expression across multiple brain regions (frontal cortex, caudate basal ganglia, putamen basal ganglia, and cortex), two skin tissue types (sun-exposed lower leg and non-sun-exposed suprapubic), tibial nerve, and testis GTEx Portal.

Lifestyle considerations No lifestyle considerations on file for this variant.

Lifestyle context

Concrete actions anchored to the cited research. We do not prescribe, we describe.

Diet

  • heart-healthy dietary pattern Moderate

    Reduced saturated fat and processed foods decreases coronary heart disease risk

    emphasize vegetables, fruits, whole grains, lean proteins, limit processed foods

Discuss with your doctor

  • personalized CHD risk reduction and prevention strategy Moderate

    Genetic risk requires individualized assessment of preventive medications and monitoring plan

Exercise

  • regular aerobic exercise program Moderate

    Aerobic exercise reduces coronary heart disease risk and is essential for carriers of genetic risk variants

    150 minutes moderate-intensity cardiovascular exercise weekly

Screening

  • cardiovascular risk assessment and lipid screening Moderate

    Genetic variant increases coronary heart disease risk warranting baseline risk stratification

    lipid panel, blood pressure, baseline electrocardiogram

Frequently asked questions

What is rs10755578 associated with?

rs10755578 is located in the SLC22A3-LPAL2-LPA gene cluster, which has been identified as a susceptibility locus for coronary artery disease. The variant is also associated with increased SLC22A3 gene expression across several tissues including brain regions, skin, tibial nerve, and testis.

Why was the LPA gene cluster heart disease risk missed in earlier genetic studies?

Earlier genome-wide association studies tested each genetic variant one at a time. The risk signal at the SLC22A3-LPAL2-LPA cluster was only detectable when researchers analyzed combinations of nearby variants together as a haplotype, rather than individually.

What does GTEx data show about rs10755578?

GTEx v11 data from 953 donors shows the ALT allele at rs10755578 is associated with increased expression of the SLC22A3 gene across eight tissues, including multiple brain regions, both sun-exposed and non-sun-exposed skin, tibial nerve, and testis, with highly significant p-values.

What is a haplotype association study?

A haplotype association study tests combinations of nearby genetic variants that tend to be inherited together on the same chromosome, rather than analyzing each variant in isolation. This approach can detect disease risk signals that standard single-variant analyses miss.

Is rs10755578 linked to coronary artery disease?

The SLC22A3-LPAL2-LPA gene cluster containing rs10755578 was identified as a CAD susceptibility locus in one genome-wide haplotype association study. No replication studies were found in the sources reviewed, so the strength of this association should be interpreted cautiously.