HIV-1 Subtype Variability in Vif Derived from Molecular Clones Affects APOBEC3G-Mediated Host Restriction
Bibliographic record
Abstract
BACKGROUND: The host protein APOBEC3G (A3G) can limit HIV-1 replication. Its protective effect is overcome by the HIV-1 'viral infectivity factor' (Vif), which targets A3G for proteosomal degradation. Although Vif is considered to be essential for HIV-1 replication, the effect of Vif variability among commonly used HIV-1 molecular clones of different genetic backgrounds on viral infectiousness and pathogenesis has not been fully determined. METHODS: We cloned the intact Vif coding regions of available molecular clones of different subtypes into expression vectors. Δvif full-length HIV-1 clonal variants were generated from corresponding subtype-specific full-length molecular clones. Replication-competent viruses were produced in 293T cells in the presence or absence of A3G, with Vif being supplied by the full-length HIV-1 clone or in trans. The extent of A3G-mediated restriction was then determined in a viral replication assay using a reporter cell line. RESULTS AND CONCLUSIONS: In the absence of A3G, Vif subtype origin did not impact viral replication. In the presence of A3G the subtype origin of Vif had a differential effect on viral replication. Vif derived from a subtype C molecular clone was less effective at overcoming A3G-mediated inhibition than Vif derived from either subtype B or CRF02_AG molecular clones.
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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) | 0.000 | 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) | 0.007 | 0.016 |
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; both teacher heads agree on what is shown here.
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".