Cloning and Characterization of the 5α-Reductase Type 2 Promoter in the Rat Epididymis1
Why this work is in the frame
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Bibliographic record
Abstract
Steroid 5alpha-reductase converts testosterone to the more potent androgen, dihydrotestosterone. The molecular mechanisms responsible for maintaining high concentrations of the 5alpha-reductase type 2 mRNA in the caput epididymidis and for regulating its region-specific expression are unknown. To gain insight into its transcriptional regulation, the cloning and characterization of the 5' upstream region of 5alpha-reductase type 2 were undertaken. Sequential deletion analysis was done to map the 2243-base pair (bp) cloned 5' upstream region, and the constructs were transfected into epididymal PC1 cells and prostatic PC3 cells. In both cell lines, regulatory elements and the minimal promoter were mapped to the 485-bp region upstream of the start codon. Primer extension and 5' RACE identified one transcriptional start site at 33-bp upstream of the start codon. Using electrophoretic mobility shift assay, a specific band was observed in the -68- to -32-bp region in the presence of nuclear extracts. Supershift and mutational studies confirmed the binding of SP1 and, to a lesser extent, SP3 to the two potential SP1 binding sites and the preference of these proteins to one binding site over the other. SP1 and SP3 were both predominantly immunolocalized to the principal cells of the epididymis and follow distinct distribution patterns in this tissue. These results provide a framework crucial in the further investigation of the transcriptional regulation of 5alpha-reductase type 2 in the rat epididymis.
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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 | 0.000 |
| 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 | 0.000 |
| 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 it