Abstract 039: The <i>PDE3A</i> Gene Regulates Blood Pressure
Bibliographic record
Abstract
Hypertension is the greatest driver of cardiovascular disease, the most common cause of death. Finding novel model mechanisms for blood-pressure (BP) regulation is an important goal. Autosomal-dominant hypertension with brachydactyly (HTNB) clinically resembles salt-resistant essential hypertension and causes death by stroke, commonly before age 50 years. We identified mutated phosphodiesterase 3A as responsible earlier; however, definitive mechanistic proof and animal models were lacking. We now describe new kindreds, one substituted within the earlier-described regulatory region (G449S), and another with a mutation causing an amino acid substitution within the PDE3A enzymatic pocket (R864C). Both exhibit the HTNB phenotype. Mutant PDE3A (T445N) overexpression in mouse vascular smooth muscle cells causes hypertension (mean telemetry BP 130/88 mm Hg vs littermate control 115/84 mm Hg, p<0.01). A 9 base-pair, three amino acid (3AA) deletion within the regulatory segment (using CRISPR-Cas9 technology), recapitulates HTNB in the rat, including the skeletal (with micro CT) phenotype. Three-weeks of radiotelemetry in homozygous 3AA+/+ rats at age 6 months revealed mean systolic BP 151, diastolic BP 119 mm Hg; heterozygous 3AA+/- (like the patients) showed 148/105 mm Hg; PDE3A knockout (frame-shift mutation) rats exhibited the lowest pressures at 115/87 mm Hg (all p<0.001) vs. BP of wild-type Sprague-Dawley rats at mean 126/90 mm Hg. R864C causes increased oligomerization. Furthermore, R864C, T445N, and 3AA all cause increased interactions at the scaffolding protein, 14-3-3 theta, compared to the wild-type (P<0.05). With two separate rodent models, our data not only direct mechanistic hypertension research along non-renal pathways, but also identify new areas of possible therapeutic intervention. We suggest that PDE3A could represent a generalizable novel therapeutic target in all instances of elevated blood pressure.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".