lbr
D. melanogaster
Lamin B receptor
What the model saw
Gene: LBR Organism: Drosophila melanogaster Known functions: Lamin B receptor. lamin B receptor. Delta14-sterol reductase activity. chromatin binding. lamin binding. oxidoreductase activity.
View unredacted entry
Lamin B receptor. lamin B receptor. Delta14-sterol reductase activity. chromatin binding. lamin binding. oxidoreductase activity.
Solver output
LBR (Lamin B Receptor) is an inner nuclear membrane protein that anchors heterochromatin to the nuclear lamina via direct lamin B and chromatin binding, thereby maintaining nuclear architecture and epigenetic compartmentalization. Loss of LBR function leads to disruption of peripheral heterochromatin tethering, a hallmark of cellular aging and senescence. Additionally, LBR possesses Delta14-sterol reductase (oxidoreductase) activity involved in cholesterol/sterol biosynthesis, contributing to membrane integrity. In aging contexts, nuclear lamina disorganization and heterochromatin loss are well-established drivers of epigenetic dysregulation; LBR's role in stabilizing this architecture suggests its normal function opposes these aging-associated changes. In Drosophila, maintenance of nuclear envelope integrity and chromatin organization through lamin-associated domains (LADs) is critical for genome stability and proper gene silencing, supporting a pro-longevity role.
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 is plausible in general terms (LBR maintains nuclear architecture and heterochromatin tethering), but it incorrectly concludes that LBR's normal function opposes aging. In Drosophila, LBR appears to have an anti-longevity effect, meaning its activity reduces lifespan or its loss extends lifespan. The model's mechanistic reasoning about nuclear lamina stabilization being pro-longevity is a reasonable hypothesis but leads to the wrong conclusion in this specific organism/gene context. The model had moderate confidence (0.62) but was still wrong on both the answer and the mechanistic interpretation as applied to this specific case.
Raw API responses
solver
{
"reasoning": "LBR (Lamin B Receptor) is an inner nuclear membrane protein that anchors heterochromatin to the nuclear lamina via direct lamin B and chromatin binding, thereby maintaining nuclear architecture and epigenetic compartmentalization. Loss of LBR function leads to disruption of peripheral heterochromatin tethering, a hallmark of cellular aging and senescence. Additionally, LBR possesses Delta14-sterol reductase (oxidoreductase) activity involved in cholesterol/sterol biosynthesis, contributing to membrane integrity. In aging contexts, nuclear lamina disorganization and heterochromatin loss are well-established drivers of epigenetic dysregulation; LBR's role in stabilizing this architecture suggests its normal function opposes these aging-associated changes. In Drosophila, maintenance of nuclear envelope integrity and chromatin organization through lamin-associated domains (LADs) is critical for genome stability and proper gene silencing, supporting a pro-longevity role.",
"confidence": 0.62,
"key_pathways": [
"nuclear lamina-heterochromatin tethering",
"lamin-associated domain (LAD) maintenance",
"Delta14-sterol reductase/cholesterol biosynthesis"
],
"mechanism_class": "epigenetic_alterations",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning is plausible in general terms (LBR maintains nuclear architecture and heterochromatin tethering), but it incorrectly concludes that LBR's normal function opposes aging. In Drosophila, LBR appears to have an anti-longevity effect, meaning its activity reduces lifespan or its loss extends lifespan. The model's mechanistic reasoning about nuclear lamina stabilization being pro-longevity is a reasonable hypothesis but leads to the wrong conclusion in this specific organism/gene context. The model had moderate confidence (0.62) but was still wrong on both the answer and the mechanistic interpretation as applied to this specific case.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}