A Potentially Prebiotic Synthesis of a 3′-Amino-3′-deoxyribonucleoside
Bibliographic record
Abstract
A central challenge in origins of life research is understanding how primitive genetic polymers could have replicated nonenzymatically prior to the evolution of macromolecular catalysts. Such a process would have required the formation of inter-nucleotide linkages, high fidelity in nucleobase pairing, and the ability to produce oligomers of sufficient length within short timescales. While modern ribozymes capable of catalyzing phosphodiester bond formation provide a model for RNA-based catalysis, they require a typical minimum length of ~50 nucleotides, a size unlikely to arise spontaneously without enzymatic intervention. Studies have demonstrated that the substitution of the canonical 3′-OH group with the much more nucleophilic 3′-NH2 group significantly enhances nonenzymatic template-directed oligomerization, and may have enabled early genetic polymers to bypass the need for enzymatic catalysis. Here, we report the synthesis of a 3′-amino-3′-deoxyribocytidine from prebiotic feedstocks. Our results support the hypothesis that 3′-amino-modified ribonucleotides could have served as substrates for the nonenzymatic synthesis of phosphoramidate nucleic acids on the early Earth prior to the emergence of RNA and ribozymes.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.001 | 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 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".