rs1743963 — SGK1

SGK1 rs1743963 — Where Stress Hormones Link Heart Disease and Depression

SGK1 (serum/glucocorticoid-regulated kinase 1) sits at a molecular crossroads between the cardiovascular system and the brain. In the kidney, SGK1 switches on the epithelial sodium channel (ENaC)¹¹ epithelial sodium channel (ENaC)
The kidney's primary sodium reabsorption channel, activated by aldosterone via SGK1 to retain salt and raise blood pressure in response to aldosterone, promoting sodium retention and blood pressure elevation. In the brain — particularly in the hippocampus — SGK1 is switched on by cortisol and acts as a molecular brake on neurogenesis: it suppresses BDNF²² BDNF
Brain-derived neurotrophic factor, the protein most critical for forming new neurons and maintaining synaptic plasticity and VEGF³³ VEGF
Vascular endothelial growth factor, also required for hippocampal progenitor cell proliferation, reducing the new neuron formation that underlies emotional resilience. The rs1743963 variant is intronic — it does not change the SGK1 protein — but it may influence how strongly SGK1 is expressed in response to glucocorticoid and aldosterone signals in relevant tissues.

The Mechanism

SGK1 expression is induced by glucocorticoids via a glucocorticoid response element in the SGK1 promoter and by mTORC2⁴⁴ mTORC2
A nutrient- and stress-sensing kinase complex that phosphorylates and activates SGK1 independently of glucocorticoids in response to growth factors and cellular stress. In the hippocampus, chronically elevated SGK1 — as occurs during prolonged psychological or physiological stress — hyperphosphorylates the glucocorticoid receptor itself, impairing negative feedback on the HPA axis⁵⁵ HPA axis
Hypothalamic-pituitary-adrenal axis — the brain's master stress-response system. The result is a vicious cycle: excess cortisol activates more SGK1, which further impairs the receptor that would normally shut cortisol secretion off, while simultaneously suppressing the hippocampal neurogenesis needed for mood regulation.

In the kidney and vasculature, the same SGK1 activation signal — now driven by aldosterone rather than cortisol — increases ENaC-mediated sodium reabsorption. This is the cellular mechanism connecting SGK1 genetic variation to blood pressure sensitivity. Intronic variants in SGK1 can create or destroy regulatory elements (splice enhancers, intronic enhancers, or binding sites for RNA-binding proteins) that alter expression levels without changing the protein sequence. The exact functional mechanism of rs1743963 has not been characterized at the molecular level.

The Evidence

The primary evidence for rs1743963 comes from Han et al. 2019⁶⁶ Han et al. 2019
Han W et al. Association of SGK1 Polymorphisms With Susceptibility to Coronary Heart Disease in Chinese Han Patients With Comorbid Depression. Frontiers in Genetics, 2019, a genotype-association study of 257 CHD patients (69 with comorbid depression, 188 without) and 107 healthy controls from a Chinese Han population. The study genotyped six SGK1 SNPs. Among these, rs1743963 and the linked rs1763509 showed significant associations with depression in CHD patients (p = 0.018 by genotype, p = 0.032 by allele for rs1743963). Critically, the associations survived Bonferroni correction — a meaningful threshold given the small cohort. Haplotype analysis revealed that the GGA haplotype (carrying the G risk allele at rs1743963) significantly increased depression risk among CHD patients, while the AAG haplotype was protective. No significant association with CHD itself was found — the effect was specifically on depression comorbidity in those already diagnosed with CHD.

These findings were supported by a 2024 meta-analysis⁷⁷ 2024 meta-analysis
Zhang et al. The effect of single nucleotide polymorphisms on depression in combination with coronary diseases: a systematic review and meta-analysis. Frontiers in Endocrinology, 2024 of 13 studies examining genetic variants in CHD-depression comorbidity, which listed rs1743963 among the risk variants for CHD-depression development.

The biological plausibility rests on extensive mechanistic work. Anacker et al. 2013 confirmed in human hippocampal progenitor cells⁸⁸ confirmed in human hippocampal progenitor cells
Anacker C et al. Role for the kinase SGK1 in stress, depression, and glucocorticoid effects on hippocampal neurogenesis. PNAS, 2013 that SGK1 suppresses neurogenesis downstream of cortisol via the Hedgehog signaling pathway, and found significantly elevated SGK1 mRNA in blood samples from drug-free depressed patients (n=25 patients, n=14 controls). SGK1 inhibition rescued cortisol-induced neurogenesis suppression in these cells. A subsequent review by Dattilo et al. 2020⁹⁹ Dattilo et al. 2020
Dattilo V et al. The Emerging Role of SGK1 in Major Depressive Disorder. Frontiers in Genetics, 2020 formalized the model of SGK1 as a molecular hub linking HPA axis dysfunction, neuroinflammation, and impaired BDNF/VEGF signaling in major depression.

For the cardiovascular side, a large Swedish cohort study (von Wowern et al. 2005, n=4,830)¹⁰¹⁰ (von Wowern et al. 2005, n=4,830)
von Wowern F et al. Genetic variance of SGK-1 is associated with blood pressure, blood pressure change over time and strength of the insulin-diastolic blood pressure relationship. Kidney International, 2005 found that SGK1 intronic variants associated with elevated systolic and diastolic blood pressure and with greater blood pressure increases over 11 years — establishing that intronic SGK1 polymorphisms influence cardiovascular phenotypes.

The evidence is best characterized as emerging: the CHD-depression association rests on a single study (257 patients) conducted in one ethnic group, with no independent replication in European or other populations to date.

Practical Actions

For carriers of the GG genotype, the most actionable implication is the convergence of depression risk and cardiovascular risk through a shared SGK1 mechanism. If you have CHD or significant cardiovascular risk factors and are experiencing depressive symptoms, the genetic evidence supports treating both conditions actively rather than assuming one will improve once the other is addressed. Blood pressure monitoring is relevant because SGK1 intronic variants in general associate with salt-sensitive hypertension.

For AG carriers, one G allele places you in an intermediate position; the haplotype data from Han 2019 suggest the GGA haplotype effect is driven by the GG state, so heterozygotes have intermediate consideration.

Interactions

The most important interaction involves rs9402571, a second regulatory SGK1 variant associated with insulin secretion and salt-sensitive blood pressure in European cohorts. These two variants tag different regulatory elements of the same gene; their combined effect on SGK1 expression has not been directly studied but could be additive if both alter SGK1 responsiveness in the same tissues.

The rs1763509 variant was co-identified with rs1743963 in the Han 2019 study as part of the SGK1 depression-CHD haplotype block. The two variants likely represent the same underlying signal rather than independent effects, as they are in linkage disequilibrium within the same intronic region.