β‐Alanine but not taurine can function as an organic osmolyte in preimplantation mouse embryos cultured from fertilized eggs
Why this work is in the frame
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Bibliographic record
Abstract
Early preimplantation mouse embryos are susceptible to the detrimental effects of increased osmolarity and, paradoxically, their in vitro development is significantly compromised by osmolarities near that of oviductal fluid. In vitro development can be restored, however, by several compounds that are accumulated by 1-cell embryos to act as organic osmolytes, providing intracellular osmotic support and cell volume regulation. Taurine, a substrate of the beta-amino acid transporter that functions as an organic osmolyte transporter in other cells, had been proposed to function as an organic osmolyte in mouse embryos. Here, however, we found that taurine is neither able to provide protection for in vitro embryo development against increased osmolarity nor is it accumulated to higher intracellular levels as osmolarity is increased, indicating that it cannot function as an organic osmolyte in early preimplantation embryos. In contrast, beta-alanine, the other major substrate of the beta-amino acid transporter, both protects against increased osmolarity and is accumulated to somewhat higher levels as osmolarity is increased, indicating that it is able to function as an organic osmolyte in embryos. However, we also found that beta-alanine is displaced from embryos by glycine-the most effective organic osmolyte in embryos previously identified-and beta-alanine does not increase protection above that afforded by glycine at concentrations near those in vivo. Thus, the beta-amino acid transporter is likely present in early preimplantation embryos to supply beta-amino acids such as taurine for purposes other than to serve as organic osmolytes.
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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