rs932764 — PLCE1

PLCE1 rs932764 — Blood Pressure, Kidney Signaling, and Preeclampsia Susceptibility

Preeclampsia — the sudden onset of high blood pressure and proteinuria after 20 weeks of pregnancy — is one of the leading causes of maternal and fetal mortality worldwide, affecting 2–8% of pregnancies. Although its origins are multifactorial, genetic predisposition to elevated blood pressure plays a measurable role. A variant in PLCE1 (phospholipase C epsilon 1), rs932764, sits at the intersection of two well-established biological processes: renal control of blood pressure and the endothelial dysfunction that characterises early preeclampsia.

The Mechanism

PLCE1 encodes phospholipase C epsilon 1¹¹ phospholipase C epsilon 1
a bifunctional enzyme that hydrolyses phosphatidylinositol-4,5-bisphosphate to generate the second messengers IP3 and diacylglycerol (DAG), and also activates Ras/MAPK signaling via its RasGEF domain. In the kidney, PLCE1 is expressed in podocytes — the specialised epithelial cells that form the filtration slits of the glomerular basement membrane. Loss-of-function mutations in PLCE1 cause nephrotic syndrome type 3 (NPHS3), characterised by proteinuria and progressive renal failure; a hallmark that is biochemically similar to the proteinuria of severe preeclampsia.

The rs932764 intronic variant does not alter the protein sequence but is thought to influence PLCE1 expression levels in renal and vascular tissue. The downstream consequence is subtly altered podocyte integrity and glomerular filtration barrier function²² podocyte integrity and glomerular filtration barrier function
the glomerular filtration barrier determines how much protein leaks into urine; impaired barrier function manifests as proteinuria, a cardinal sign of preeclampsia, with knock-on effects on renal sodium handling and vascular tone. IP3/DAG signalling also activates TRPC6 calcium channels³³ TRPC6 calcium channels
transient receptor potential canonical 6 channels; mediators of Ca²⁺ influx in podocytes and vascular smooth muscle cells, linking PLCE1 activity directly to vascular contractility and blood pressure regulation.

The Evidence

The foundational evidence for rs932764 comes from a landmark 2011 multi-stage GWAS of blood pressure by Ehret et al. (ICBP consortium) in Nature⁴⁴ Ehret et al. (ICBP consortium) in Nature
69,395-person discovery in 29 European-descent cohorts, followed by validation in 133,661 additional individuals; total ≈ 200,000 individuals. The G allele at rs932764 was associated with +0.484 mmHg systolic blood pressure (SBP; P=7.1×10⁻¹⁶) and +0.185 mmHg diastolic blood pressure (DBP; P=8.1×10⁻⁷), with a hypertension association P=9.4×10⁻⁹. Although each copy of the G allele adds less than half a millimetre of mercury on average, this effect integrates across a lifetime of continuous blood pressure exposure and compounds with other variants.

A 2023 genome-wide association meta-analysis by Tyrmi et al. in JAMA Cardiology⁵⁵ Tyrmi et al. in JAMA Cardiology
16,743 women with preeclampsia; cohorts from Finland, Estonia, and the InterPregGen consortium identified the PLCE1 locus as one of seven novel preeclampsia risk loci that overlap with established blood pressure loci. The lead signal near PLCE1 (rs10882398) was associated with preeclampsia/gestational hypertension with OR 1.11 (95% CI 1.08–1.14; P=1.77×10⁻¹³) — a finding the authors interpreted through PLCE1's role in podocyte function and the glomerular filtration barrier. The same study noted that several blood pressure genes show pleiotropic effects on cardiometabolic, endothelial, and placental function, consistent with the clinical overlap between chronic hypertension and preeclampsia.

A regional Russian study by Churnosov et al. (Placenta, 2022)⁶⁶ Churnosov et al. (Placenta, 2022)
452 preeclampsia patients and 498 controls, Caucasian, Central Russia found that rs932764 contributed to the highest proportion of epistatic interaction models (≥50%) among ten hypertension susceptibility SNPs examined in preeclampsia. Follow-up work from the same group (Ivanova et al. 2023, two papers⁷⁷ Ivanova et al. 2023, two papers
n=939 HTN cases/466 controls and n=1,405 sex-stratified hypertension analysis) confirmed rs932764's presence in the top interaction model for hypertension: a four-locus combination with TBX2, AC026703.1, and RGL3 (Wald stat=33.53; p_perm<0.001).

Practical Actions

For individuals carrying one or two G alleles, the clinically meaningful period is the periconceptional and prenatal window. The G allele appears to contribute to a subtle but persistent upward pressure on basal blood pressure that may be unmasked by the haemodynamic demands of pregnancy. Specific monitoring strategies — particularly early blood pressure surveillance and attention to proteinuria screening — are indicated rather than generic lifestyle modifications. For carriers considering pregnancy, discussing the PLCE1 finding with an obstetrician or maternal-fetal medicine specialist before conception may allow earlier surveillance planning.

Dietary approaches with specific mechanistic relevance to the PLCE1/podocyte pathway include maintaining adequate dietary nitrate (leafy green vegetables), which supports endothelial nitric oxide production⁸⁸ endothelial nitric oxide production
a key vasodilatory mechanism often impaired in preeclampsia and limiting sodium intake below 2,300 mg/day, which directly reduces the renal filtration burden on structurally compromised glomeruli.

Interactions

The strongest documented interaction context for rs932764 involves NPR3 rs2609002. NPR3 encodes the natriuretic peptide clearance receptor, and loss-of-function variants accelerate ANP clearance from circulation. ANP (atrial natriuretic peptide) promotes renal sodium excretion, counteracts the renin-angiotensin system, and participates in uterine spiral artery remodelling — a process impaired in early preeclampsia pathogenesis. Individuals carrying both PLCE1 rs932764 GG/AG (glomerular filtration compromise) and NPR3 rs2609002 risk genotypes (reduced ANP clearance counter-signalling) may face compounding susceptibility to gestational hypertension through dual impairment of renal pressure regulation — via the structural podocyte axis (PLCE1) and the natriuretic signalling axis (NPR3). Carriers of both risk variants should be considered for early antenatal blood pressure surveillance and pre-conception counselling.