Amish microcephaly: Long‐term survival and biochemical characterization
Bibliographic record
Abstract
Amish microcephaly (MCPHA, OMIM #607196) is a metabolic disorder that has been previously characterized by severe infantile lethal congenital microcephaly and alpha-ketoglutaric aciduria. All reported patients have been from the Pennsylvania Amish community and homozygous for a p.Gly177Ala mutation in SLC25A19. We present a further male patient with MCPHA born to distantly consanguineous parents in Ontario, Canada with Amish ancestors. Microcephaly was evident at 21 weeks gestation on ultrasound. At birth, the facial appearance and brain MRI scan were characteristic of MCPHA, with the additional features of partial agenesis of the corpus callosum and a closed spinal dysraphic state. Urine levels of alpha-ketoglutaric acid were normal at birth and during metabolic crisis, but were markedly elevated during a time of metabolic stability. A severe lactic acidosis was present during metabolic crises and responded to treatment with a high fat diet. At age 7 years, the child is healthy but has severe microcephaly and profound developmental delay. SLC25A19 has been described as a mitochondria inner membrane transporter for both deoxynucleotides and thiamine pyrophosphate (TPP). The biochemical phenotype of MCPHA may be attributable to decreased activity of the three mitochondrial enzymes that require TPP as a cofactor: pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase, and branched chain amino acid dehydrogenase. We confirm that alpha-ketoglutaric aciduria is not a constant finding in MCPHA and suggest that a persistent lactic acidemia may be more common. The diagnosis should be considered in patients with severe congenital microcephaly, especially in association with lissencephaly, dysgenesis of the corpus callosum, or a spinal dysraphic state.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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 | 0.000 |
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".