Homing Efficiency and Proliferation Kinetics of Male Germ Line Stem Cells Following Transplantation in Mice1
Why this work is in the frame
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Bibliographic record
Abstract
Stem cells in the male germ line (spermatogonial stem cells [SSCs]) are an important target for male fertility restoration and germ line gene modification. To establish a model system to study the biology and the applications of SSCs in mice, I used a sequential transplantation strategy to analyze the process by which SSCs colonize the stem cell niche after transplantation and to determine the efficiency of the process (homing efficiency). I further analyzed the proliferation kinetics of SSCs after colonization. The number of SSCs gradually decreased during the homing process, and only 12% of SSCs successfully colonized the niche on Day 7 after transplantation, but the number of SSCs increased by Day 14. Thus, homing efficiency of adult mouse SSCs is 12%. These results indicate that SSCs are rapidly lost upon transplantation and require approximately 1 wk to settle into their niches before initiating expansion. Using this SSC homing efficiency, I calculated that approximately 3000 SSCs exist in one normal adult testis, representing approximately 0.01% of total testis cells. Between 7 days and 1 mo after transplantation, SSCs proliferated 7.5-fold. However, they did not significantly proliferate thereafter until 2 mo, and only 8 SSCs supported one colony of donor-derived spermatogenesis from 1 to 2 mo. These results suggest that self-renewal and differentiation of SSCs are strictly regulated in coordination with the progress of an entire unit of regenerating spermatogenesis.
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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