Structural Abnormalities of the Cornea and Lid Resulting from Collagen V Mutations
Why this work is in the frame
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Bibliographic record
Abstract
PURPOSE: Type V collagen forms heterotypic fibrils with type I collagen and accounts for 10% to 20% of corneal collagen. The purpose of this study was to define the ocular phenotype resulting from mutations in the type V collagen genes COL5A1 and COL5A2 and to study the pathogenesis of anomalies in a Col5a1-deficient mouse. METHODS: Seven patients with classic Ehlers-Danlos syndrome (EDS) due to COL5A1 haploinsufficiency and one with an exon-skipping mutation in COL5A2 underwent an ocular examination, corneal topography, pachymetry, and specular microscopy. A Col5a1-haploinsufficient mouse model of classic EDS was used for biochemical and immunochemical analyses of corneas. Light and electron microscopy were used to quantify stromal thickness, fibril density, fibril structure, and diameter. RESULTS: Five males and three females (mean age, 26 +/- 13.57 years; range, 11-52) were studied. All patients had "floppy eyelids." The corneas of all eyes were thinner (mean corneal thickness: 435.75 +/- 12.51 microm) when compared with control corneas (568.89 +/- 28.46 microm; P < 0.0001). In the Col5a1+/- mouse cornea, type V collagen content was reduced by approximately 49%, and stromal thickness was reduced by approximately 26%. Total collagen deposition in Col5a1(+/-) corneas also was reduced. Collagen fibril diameters were increased, but fibril density was decreased throughout the stroma at all developmental stages. CONCLUSIONS: In the eye, COL5A1 and COL5A2 mutations manifest as abnormally thin and steep corneas with floppy eyelids. Mechanisms involved in producing the latter anomalies probably involve altered regulation of collagen fibrillogenesis due to abnormalities in heterotypic type I/V collagen interactions similar to those observed in the Col5a1+/- mouse cornea.
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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 | 0.000 | 0.001 |
| 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 | 0.006 |
| 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 it