Tapetal-like sheen as a key phenotypical feature in TTLL5-associated cone dystrophy caused by a novel variant
Bibliographic record
Abstract
Purpose To report a patient with cone dystrophy and a striking tapetal reflex caused by a novel variant in TTLL5 , which was initially missed by a local retinal specialist due to inaccurate phenotyping of macular dystrophy. Observation A 33-year-old male patient presented with Bull’s eye maculopathy and a tapetal-like reflex, confirmed via fundus examination and multimodal imaging. Initial genetic testing with a macular dystrophy panel was negative. Electroretinography showed reduced photopic responses and normal scotopic responses, supporting a diagnosis of cone dystrophy, and subsequent evaluation using an extended inherited retinal dystrophy panel identified a homozygous TTLL5 c.1186+2T>C variant classified as “likely pathogenic.” Conclusions and Importance This case underscores the critical role of accurate phenotyping in guiding molecular genetic testing, particularly in distinguishing cone dystrophy from other macular dystrophies, and highlights the unique expertise of inherited retinal disease specialists in this process. Additionally, it further validates the possibility that the tapetal reflex is a common but previously underrecognized feature of TTLL5 -associated retinal dystrophies and expands the known variant spectrum of TTLL5 -associated disease. The presence of a tapetal reflex—previously widely associated with RPGR-associated dystrophies—highlighting the overlapping disease mechanisms and clinical presentation.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".