Informed reasoning: repositioning of nitisinone to treat oculocutaneous albinism
Bibliographic record
Abstract
Oculocutaneous albinism (OCA) is a group of genetic disorders characterized by hypopigmentation of the skin, hair, and eyes.Affected individuals experience reduced visual acuity and substantially increased skin cancer risk.There are four major types of OCA (OCA1-OCA4) that result from disruption in production of melanin from tyrosine.Current treatment options for individuals with OCA are limited to attempts to correct visual problems and counseling to promote use of sun protective measures.However, Onojafe et al., reporting in this issue of the JCI, provide hope for a new treatment approach for OCA, as they demonstrate that treating mice that model OCA-1b with nitisinone, which is FDA approved for treating hereditary tyrosinemia type 1, elevates plasma tyrosine levels, and increases eye and hair pigmentation. Oculocutaneous albinismMelanin is a biopolymer synthesized from tyrosine.Upon synthesis, it is deposited in specialized organelles (melanosomes) in neural crest-derived melanocytes found in the skin, hair follicles, iris, uveal tract, and inner ear as well as in retinal pigmented epithelium (RPE) derived from the optic cup.Oculocutaneous albinism (OCA) denotes a group of common autosomal-recessive disorders that result from disruption of melanin synthesis.There are four major forms: OCA1, which is caused by mutations in the tyrosinase gene (TYR) (1); OCA2, caused by mutations in OCA2 (2); OCA3, caused by mutations in the tyrosinase-related protein 1 gene (TYRP1) (3); and OCA4, caused by mutations in the solute carrier family 45, member 2 gene (SLC45A2) (4).OCA1 affects approximately 1 in 40,000 people worldwide and is the most prevalent form of OCA among individuals of mixed European descent.OCA2 affects 1 in 39,000 such individuals, with substantially higher prevalence in African-American and Amerindian populations.The carrier rate of a pathogenic deletion of OCA2 in African-American newborns is estimated to be 1 in 235 (5); rates in some Amerindian populations reach 1 in 200 (6).OCA3 is rare, with notable frequency only in African populations (3).The inci-
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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 | 0.001 | 0.009 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.022 | 0.015 |
| Insufficient payload (model declined to judge) | 0.006 | 0.004 |
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".