DNA mismatch repair proteins promote apoptosis and suppress tumorigenesis in response to UVB irradiation: an in vivo study
Bibliographic record
Abstract
DNA mismatch repair (MMR) proteins are integral to the maintenance of genomic stability and suppression of tumorigenesis due to their role in repair of post-replicative DNA errors. Recent data also support a role for MMR proteins in cellular responses to exogenous DNA damage that does not involve removal of DNA adducts. We have demonstrated previously that both Msh2- and Msh6-null primary mouse embryonic fibroblasts are significantly less sensitive to UVB (ultraviolet B)-induced cytotoxicity and apoptosis than wild-type control cells. In order to ascertain the physiological relevance of the data we have exposed MMR-deficient mice to acute and chronic UVB radiation. We found that MMR-deficiency was associated with reduced levels of apoptosis and increased residual UVB-induced DNA adducts in the epidermis 24-h following acute UVB exposure. Moreover, Msh2-null mice developed UVB-induced skin tumors at a lower level of cumulative UVB exposure and with a greater severity of onset than wild-type mice. The Msh2-null skin tumors did not display microsatellite instability, suggesting that these tumors develop via a different tumorigenic pathway than tumors that develop spontaneously. Therefore, we propose that dysfunctional MMR promotes UVB-induced tumorigenesis through reduced apoptotic elimination of damaged epidermal cells.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| 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".