Pontocerebellar Hypoplasia Type 1: New Leads for an Earlier Diagnosis
Bibliographic record
Abstract
Pontocerebellar hypoplasia type 1 is a rare disease characterized by pontocerebellar hypoplasia and anterior horn cell degeneration. The oldest reported child died at the age of 26 months. Two siblings were diagnosed with pontocerebellar hypoplasia type 1 after the death of the second sibling at 40 months of age from respiratory failure and the unexpected finding of anterior horn cell degeneration on her autopsy. The older sibling was a boy who was labeled as having cerebral palsy. He died at 14 months of age from pneumonia following a clinical course similar to his sister's, who was born 5 years after his death. Both siblings had significant global developmental delay with axial and peripheral hypotonia initially. Peripheral hypertonia with brisk reflexes developed later but were absent prior to death. Extensive investigations in the second sibling ruled out known metabolic (including congenital disorders of glycosylation) and mitochondrial diseases using skin fibroblast cultures and enzyme analysis. Genetic testing for Friedreich's ataxia; neuropathy, ataxia, and retinitis pigmentosa (NARP); spinal muscular atrophy; and spinocerebellar ataxia type 1, 2, 3, 6, 7, and 8 gene abnormalities was negative. The elecroretinogram showed a previously unreported finding of abnormal and progressive rod/cone response. Our cases provide clinical and previously unreported electroretinographic evidence for neurodegeneration in pontocerebellar hypoplasia type 1 and call for the expansion of the disease phenotype.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.004 | 0.002 |
| Insufficient payload (model declined to judge) | 0.005 | 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 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".