tkt-1
C. elegans
transketolase
What the model saw
Gene: tkt-1 Organism: Caenorhabditis elegans Known functions: transketolase. thiamine pyrophosphate binding. transketolase activity.
View unredacted entry
transketolase. thiamine pyrophosphate binding. transketolase activity.
Solver output
Transketolase (tkt-1) is a thiamine pyrophosphate (TPP)-dependent enzyme that catalyzes key reactions in the non-oxidative branch of the pentose phosphate pathway (PPP). The PPP generates NADPH, which is essential for maintaining the glutathione-based antioxidant defense system and combating oxidative stress — a major driver of aging. By channeling carbon flux through the PPP, transketolase supports redox homeostasis and nucleotide biosynthesis, both of which are critical for cellular maintenance and stress resistance. In C. elegans, enhanced flux through the PPP and improved redox buffering capacity are associated with extended lifespan, particularly under conditions of oxidative or metabolic stress. Additionally, the PPP intersects with nutrient sensing pathways (e.g., glucose metabolism and NADPH-dependent signaling), linking tkt-1 function to the deregulated nutrient sensing hallmark of aging.
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 predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning about transketolase supporting NADPH production and redox homeostasis is plausible in general biochemical terms, but it led to the wrong conclusion. In C. elegans, tkt-1 appears to have an anti-longevity role, meaning its loss or reduction extends lifespan. The model's mechanistic reasoning about PPP and NADPH is generic and not specific to C. elegans tkt-1 biology. The model showed moderate confidence (0.65) but was still wrong on both the answer and the mechanism as it applies to this specific gene in this organism.
Raw API responses
solver
{
"reasoning": "Transketolase (tkt-1) is a thiamine pyrophosphate (TPP)-dependent enzyme that catalyzes key reactions in the non-oxidative branch of the pentose phosphate pathway (PPP). The PPP generates NADPH, which is essential for maintaining the glutathione-based antioxidant defense system and combating oxidative stress — a major driver of aging. By channeling carbon flux through the PPP, transketolase supports redox homeostasis and nucleotide biosynthesis, both of which are critical for cellular maintenance and stress resistance. In C. elegans, enhanced flux through the PPP and improved redox buffering capacity are associated with extended lifespan, particularly under conditions of oxidative or metabolic stress. Additionally, the PPP intersects with nutrient sensing pathways (e.g., glucose metabolism and NADPH-dependent signaling), linking tkt-1 function to the deregulated nutrient sensing hallmark of aging.",
"confidence": 0.65,
"key_pathways": [
"pentose phosphate pathway (non-oxidative branch)",
"NADPH-dependent redox homeostasis",
"thiamine pyrophosphate metabolism"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning about transketolase supporting NADPH production and redox homeostasis is plausible in general biochemical terms, but it led to the wrong conclusion. In C. elegans, tkt-1 appears to have an anti-longevity role, meaning its loss or reduction extends lifespan. The model's mechanistic reasoning about PPP and NADPH is generic and not specific to C. elegans tkt-1 biology. The model showed moderate confidence (0.65) but was still wrong on both the answer and the mechanism as it applies to this specific gene in this organism.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}