apl-1
C. elegans
Amyloid-beta-like protein
What the model saw
Gene: apl-1 Organism: Caenorhabditis elegans Known functions: Amyloid-beta-like protein. heparin binding. transition metal ion binding.
View unredacted entry
Amyloid-beta-like protein. heparin binding. transition metal ion binding.
Solver output
apl-1 is the C. elegans ortholog of human amyloid precursor protein (APP), and its amyloid-beta-like domain is central to its classification. Amyloid-beta peptides generated from APP-like proteins are hallmark drivers of proteotoxic aggregation, a key feature of loss of proteostasis. The transition metal ion binding activity (e.g., Cu²⁺, Zn²⁺) is consistent with APP/Aβ biology, where metal coordination promotes oligomerization and aggregation of amyloid-like peptides. Heparin binding further mirrors APP interactions with heparan sulfate proteoglycans, which facilitate amyloid deposition and plaque formation. While apl-1 has essential developmental roles in C. elegans, its amyloid-beta-like molecular function suggests that its activity, particularly if dysregulated or overexpressed, promotes proteotoxic stress and aggregation pathology that shortens lifespan. Studies in C. elegans have shown that overexpression of amyloid-beta or APP-like fragments accelerates aging phenotypes and reduces 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 predicted anti_longevity but the ground truth is pro_longevity. The model's reasoning focused on the amyloid-beta-like domain and assumed that apl-1 promotes proteotoxic aggregation and shortens lifespan, analogizing to human APP/Aβ pathology. However, apl-1 in C. elegans is actually pro-longevity. Research has shown that apl-1 is essential for development and that its expression (particularly the extracellular domain) promotes longevity, likely through signaling roles rather than amyloid toxicity. The model made a reasonable-sounding but ultimately incorrect inference by over-relying on the amyloid-beta analogy and ignoring that apl-1's physiological role in C. elegans is distinct from pathological Aβ aggregation in humans. The mechanism proposed (loss of proteostasis via amyloid aggregation) is also incorrect. The model showed moderate confidence (0.65) in a wrong answer with flawed mechanistic reasoning.
Raw API responses
solver
{
"reasoning": "apl-1 is the C. elegans ortholog of human amyloid precursor protein (APP), and its amyloid-beta-like domain is central to its classification. Amyloid-beta peptides generated from APP-like proteins are hallmark drivers of proteotoxic aggregation, a key feature of loss of proteostasis. The transition metal ion binding activity (e.g., Cu²⁺, Zn²⁺) is consistent with APP/Aβ biology, where metal coordination promotes oligomerization and aggregation of amyloid-like peptides. Heparin binding further mirrors APP interactions with heparan sulfate proteoglycans, which facilitate amyloid deposition and plaque formation. While apl-1 has essential developmental roles in C. elegans, its amyloid-beta-like molecular function suggests that its activity, particularly if dysregulated or overexpressed, promotes proteotoxic stress and aggregation pathology that shortens lifespan. Studies in C. elegans have shown that overexpression of amyloid-beta or APP-like fragments accelerates aging phenotypes and reduces longevity.",
"confidence": 0.65,
"key_pathways": [
"amyloid precursor protein processing",
"proteotoxic aggregation",
"transition metal-mediated amyloid oligomerization"
],
"mechanism_class": "loss_of_proteostasis",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model predicted anti_longevity but the ground truth is pro_longevity. The model's reasoning focused on the amyloid-beta-like domain and assumed that apl-1 promotes proteotoxic aggregation and shortens lifespan, analogizing to human APP/Aβ pathology. However, apl-1 in C. elegans is actually pro-longevity. Research has shown that apl-1 is essential for development and that its expression (particularly the extracellular domain) promotes longevity, likely through signaling roles rather than amyloid toxicity. The model made a reasonable-sounding but ultimately incorrect inference by over-relying on the amyloid-beta analogy and ignoring that apl-1's physiological role in C. elegans is distinct from pathological Aβ aggregation in humans. The mechanism proposed (loss of proteostasis via amyloid aggregation) is also incorrect. The model showed moderate confidence (0.65) in a wrong answer with flawed mechanistic reasoning.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}