Top3alpha
D. melanogaster
Topoisomerase 3alpha
What the model saw
Gene: Top3alpha Organism: Drosophila melanogaster Known functions: Topoisomerase 3alpha. topoisomerase 3alpha. DNA binding. DNA topoisomerase activity. DNA topoisomerase type I (single strand cut, ATP-independent) activity. zinc ion binding.
View unredacted entry
Topoisomerase 3alpha. topoisomerase 3alpha. DNA binding. DNA topoisomerase activity. DNA topoisomerase type I (single strand cut, ATP-independent) activity. zinc ion binding.
Solver output
Topoisomerase 3α (Top3α) is a type IA DNA topoisomerase that resolves topological stress by transiently cutting single-stranded DNA in an ATP-independent manner. In Drosophila, Top3α works in concert with the RecQ helicase (BLM/Blm) and RMI proteins to dissolve double Holliday junctions during homologous recombination, preventing the accumulation of aberrant recombination intermediates and crossovers. Loss of this activity leads to increased genomic instability, replication fork stalling, and DNA damage accumulation — all hallmarks of accelerated aging. Its zinc ion binding supports structural integrity of the active site required for DNA strand passage. By maintaining genome integrity and suppressing illegitimate recombination, Top3α normal function directly opposes a primary driver of aging (genomic instability), thus promoting longevity.
GenAge curators classify each gene's normal function as promoting (Pro-Longevity) or opposing (Anti-Longevity) longevity, based on synthesis across studies. Loss-of-function effects can vary from this depending on the manipulation.
Advisor judgment
The model correctly predicted pro_longevity for Top3alpha in Drosophila melanogaster. The mechanistic reasoning is sound and well-grounded: Top3α is indeed a type IA topoisomerase that works with BLM/RMI to dissolve Holliday junctions, and loss of function leads to genomic instability consistent with accelerated aging. The reasoning logically connects DNA topology maintenance to longevity via the genomic instability hallmark of aging. Confidence of 0.75 is appropriate. The reasoning is detailed and accurate, though it is somewhat generic in that it doesn't cite specific Drosophila lifespan experiments directly, but the mechanistic logic is correct.
Raw API responses
solver
{
"reasoning": "Topoisomerase 3α (Top3α) is a type IA DNA topoisomerase that resolves topological stress by transiently cutting single-stranded DNA in an ATP-independent manner. In Drosophila, Top3α works in concert with the RecQ helicase (BLM/Blm) and RMI proteins to dissolve double Holliday junctions during homologous recombination, preventing the accumulation of aberrant recombination intermediates and crossovers. Loss of this activity leads to increased genomic instability, replication fork stalling, and DNA damage accumulation — all hallmarks of accelerated aging. Its zinc ion binding supports structural integrity of the active site required for DNA strand passage. By maintaining genome integrity and suppressing illegitimate recombination, Top3α normal function directly opposes a primary driver of aging (genomic instability), thus promoting longevity.",
"confidence": 0.75,
"key_pathways": [
"DNA topoisomerase-mediated genome stability",
"BLM-Top3α-RMI Holliday junction dissolution",
"homologous recombination repair"
],
"mechanism_class": "genomic_instability",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly predicted pro_longevity for Top3alpha in Drosophila melanogaster. The mechanistic reasoning is sound and well-grounded: Top3α is indeed a type IA topoisomerase that works with BLM/RMI to dissolve Holliday junctions, and loss of function leads to genomic instability consistent with accelerated aging. The reasoning logically connects DNA topology maintenance to longevity via the genomic instability hallmark of aging. Confidence of 0.75 is appropriate. The reasoning is detailed and accurate, though it is somewhat generic in that it doesn't cite specific Drosophila lifespan experiments directly, but the mechanistic logic is correct.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 4,
"ground_truth_questionable": false
}