The burden of cardiac genetic disease in Newfoundland and Labrador: elucidating the pathogenicity and genotype-phenotype profile of a Ryanodine Receptor 2 variant- RYR2 p.Y4962N
Bibliographic record
Abstract
Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a rare and potentially fatal inherited arrhythmia commonly linked to genetic variants in the Ryanodine Receptor 2 (RYR2) gene. This thesis investigates a Newfoundland family with suspected CPVT brought to attention after the sudden passing of a young individual carrying the RYR2 p.Y4962N variant. This variant was initially classified as likely pathogenic but was later downgraded to a variant of unknown significance (VUS) following updates to American College of Medical Genetics (ACMG) guidelines. A total of 655 family members were ascertained in the extended family pedigree across seven generations, with 93 individuals identified as being at 50% a priori risk of inheriting the RYR2 p.Y4962N variant. RYR2 p.Y4962N was identified in 33 individuals, with 27 individuals testing negative for the variant. Genetic status was unknown for 33 individuals. Four cases of sudden unexplained death (SUD) were identified within the family. However, comprehensive evaluation of the extended pedigree revealed no clear CPVT phenotype. Clinical assessments, including ESTs, ECGs, echocardiograms, and Holter monitoring, showed either no or mild abnormalities across both variant-positive and variant-negative individuals for all cardiac tests. These findings highlight the challenges of variant interpretation and raise the possibility that RYR2 p.Y4962N may be a benign or modifier variant. Functional characterization and investigations into a possible recessive variant may elucidate the genotype-phenotype relationship.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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 source (direct Gemma or distilled Codex), 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".