Close connections between contraction and rhythm: a new genetic cause of atrial fibrillation/cardiomyopathy and what it can teach us
Bibliographic record
Abstract
This editorial refers to ‘A frameshift deletion in the sarcomere gene MYL4 causes early-onset familial atrial fibrillation’†, by D.F. Gudbjartsson et al. , on page 27. A review of the literature published a decade ago reported that almost nothing was known about the genetics of atrial fibrillation (AF), but suggested that ‘Identifying the gene of susceptibility, coupled with defining the sequence and function of the protein that it encodes, has the potential to provide both insight into the pathophysiology of the arrhythmia and diagnostic tools with which to identify susceptible individuals’.1 Subsequent work has richly confirmed the validity of this statement. A recent review listed 33 rare variants and 14 genetic loci associated with AF, and discussed the importance of their discovery for pathophysiological understanding and clinical practice.2 Of the rare variants, the most common motifs are variants in ion-channel subunits (in 21) and transcription factors (in 6). AF clearly has a strong heritable basis2 and it is likely that the discovery of novel AF-associated loci will continue to occur and to improve our understanding of this widely prevalent condition. In the present issue of the journal, Gudbjartsson et al. report just such a finding.3 They used highly sophisticated whole-genome sequencing and statistical genetics methods to identify sequence variants linked to early-onset AF in 1799 Icelanders. These approaches revealed a rare frameshift deletion in the atrial myosin light-chain gene MYL4 associating with early-onset AF under recessive inheritance models. Eight homozygous carriers all had early-onset AF, three required pacemakers for sick sinus syndrome, three had strokes (without non-AF risk factors), and one experienced sudden death. ECG intervals were generally unremarkable. The only abnormalities present on early echocardiograms were left atrial dilation in two patients. Late echocardiograms showed …
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 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".