711. Intravenous Neonatal Gene Therapy Corrects GM2 Gangliosidosis in Sandhoff Mice for Long-Term, By Using AAV Viral Vector Expressing a New Hexosaminidase Variant
Bibliographic record
Abstract
GM2 gangliosidosis is a group of neurodegenerative disorders, characterized by the malfunctioning Hexosaminidase A (HexA) enzyme, for which there is no treatment. HexA is composed of two similar, but non-identical subunits, the alpha and the beta, which must interact with the GM2 activator protein, a substrate-specific cofactor, to hydrolyze GM2. Mutation in either subunit (or the activator) results in the development of GM2 gangliosidosis. In these diseases, the malfunctioning protein is unable to play its role in cleaving GM2 ganglioside, whose accumulation within the neurons of the central nervous system is ultimately toxic. The resulting neuronal death induces the primary symptoms of the disease; motor impairment, seizures, and sensory impairments. The aim of this study is to observe the long-term in vivo effects of a novel treatment in a Sandhoff (beta deficient) mouse model. The treatment utilized a new Hex isoenzyme, Hex M, which functions as a homodimer in the treatment of GM2 gangliosidosis. The HexM subunit is a variant of the human Hex alpha subunit containing critical beta-components that allow it to form stable homodimers and interact with the GM2 activator protein to reduce substrate storage. Our methods include intravenous injections of the neonatal mice with a self-complementary vector (with a synthetic promoter) expressing HexM at day 0-1. We monitored one cohort for 8 weeks and another cohort long-term (>40 weeks) for biochemical, behavioural and molecular analyses. Through the enzymatic and GM2 ganglioside lipid analyses, we see that with a slight increase in enzyme activity, there is a significant increase in the clearance of GM2 gangliosides. On behavioural tests, the treated mice outperform their knockout age matched controls. While the untreated controls die before the age of 15 weeks, treated animals have survived to more than 40 weeks and are still being monitored. The molecular analyses reveal a uniform distribution of the vector between brain and spinal cord regions. In conclusion, the neonatal delivery of our newly synthesized viral vector expressing HexM to the Sandhoff mice provided long-term correction of the disease. This study will have implications not only for treatment of Sandhoff, but also Tay-Sachs disease (alpha deficiency).
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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) | 0.000 | 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 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".