fkh
D. melanogaster
fork head
What the model saw
Gene: fkh Organism: Drosophila melanogaster Known functions: fork head. DNA binding. DNA-binding transcription factor activity. DNA-binding transcription factor activity, RNA polymerase II-specific. RNA polymerase II cis-regulatory region sequence-specific DNA binding. RNA polymerase II transcription regulatory region sequence-specific DNA binding. protein domain specific binding. sequence-specific DNA binding.
View unredacted entry
fork head. DNA binding. DNA-binding transcription factor activity. DNA-binding transcription factor activity, RNA polymerase II-specific. RNA polymerase II cis-regulatory region sequence-specific DNA binding. RNA polymerase II transcription regulatory region sequence-specific DNA binding. protein domain specific binding. sequence-specific DNA binding.
Solver output
The Drosophila gene fkh (fork head) encodes the founding member of the FOXO/Forkhead transcription factor family. FOXO-class forkhead transcription factors are well-established pro-longevity regulators that act downstream of the insulin/IGF-1 signaling (IIS) pathway. When IIS is reduced, FOXO/fkh translocates to the nucleus and binds RNA Pol II cis-regulatory regions to transcriptionally activate stress resistance, proteostasis, and autophagy genes. In multiple model organisms, increased FOXO/dFOXO activity extends lifespan, while loss of function shortens it. The sequence-specific DNA binding and RNA Pol II transcription regulatory activities annotated here are consistent with its role as a nuclear effector of nutrient/insulin sensing that reprograms gene expression toward longevity-promoting outcomes.
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 predicts pro_longevity for fkh in Drosophila. However, the mechanistic reasoning contains a significant error: fkh (fork head) is NOT the same as dFOXO. While both are forkhead transcription factors, fkh is the founding member of the forkhead family (Class I forkhead, related to mammalian FOXA), whereas dFOXO (encoded by the foxo gene in Drosophila) is the actual FOXO-class transcription factor that acts downstream of insulin/IGF-1 signaling. The model conflates fkh with FOXO/dFOXO, which are distinct genes. The pro-longevity role of fkh in Drosophila has been demonstrated (overexpression extends lifespan), but the mechanism is not primarily through the IIS/FOXO pathway as described. The model's reasoning about IIS pathway, nuclear translocation upon reduced IIS, and FOXO-specific biology is incorrectly attributed to fkh. This is a meaningful mechanistic error despite the correct final answer.
Raw API responses
solver
{
"reasoning": "The Drosophila gene fkh (fork head) encodes the founding member of the FOXO/Forkhead transcription factor family. FOXO-class forkhead transcription factors are well-established pro-longevity regulators that act downstream of the insulin/IGF-1 signaling (IIS) pathway. When IIS is reduced, FOXO/fkh translocates to the nucleus and binds RNA Pol II cis-regulatory regions to transcriptionally activate stress resistance, proteostasis, and autophagy genes. In multiple model organisms, increased FOXO/dFOXO activity extends lifespan, while loss of function shortens it. The sequence-specific DNA binding and RNA Pol II transcription regulatory activities annotated here are consistent with its role as a nuclear effector of nutrient/insulin sensing that reprograms gene expression toward longevity-promoting outcomes.",
"confidence": 0.82,
"key_pathways": [
"Insulin/IGF-1 signaling (IIS) pathway",
"FOXO transcription factor network",
"Stress response and autophagy gene regulation"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly predicts pro_longevity for fkh in Drosophila. However, the mechanistic reasoning contains a significant error: fkh (fork head) is NOT the same as dFOXO. While both are forkhead transcription factors, fkh is the founding member of the forkhead family (Class I forkhead, related to mammalian FOXA), whereas dFOXO (encoded by the foxo gene in Drosophila) is the actual FOXO-class transcription factor that acts downstream of insulin/IGF-1 signaling. The model conflates fkh with FOXO/dFOXO, which are distinct genes. The pro-longevity role of fkh in Drosophila has been demonstrated (overexpression extends lifespan), but the mechanism is not primarily through the IIS/FOXO pathway as described. The model's reasoning about IIS pathway, nuclear translocation upon reduced IIS, and FOXO-specific biology is incorrectly attributed to fkh. This is a meaningful mechanistic error despite the correct final answer.",
"failure_mode": "right_answer_wrong_reasoning",
"answer_correct": true,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}