hpl-2
C. elegans
Chromobox protein homolog hpl-2
What the model saw
Gene: hpl-2 Organism: Caenorhabditis elegans Known functions: Chromobox protein homolog hpl-2. chromatin binding. histone H3K9me2/3 reader activity. protein binding.
View unredacted entry
Chromobox protein homolog hpl-2. chromatin binding. histone H3K9me2/3 reader activity. protein binding.
Solver output
HPL-2 is a C. elegans HP1 (Heterochromatin Protein 1) homolog that reads H3K9me2/3 marks via its chromodomain, a hallmark of constitutive heterochromatin. By binding H3K9-methylated chromatin, HPL-2 helps maintain transcriptional silencing of repetitive elements and transposons, which is critical for genomic and epigenetic stability during aging. Loss of heterochromatin integrity and H3K9me3 marks is a well-documented feature of aging in C. elegans and other organisms. HPL-2 also participates in silencing of germline genes in somatic tissues; its normal function preserves the somatic epigenetic identity that supports longevity. Maintenance of repressive chromatin states through H3K9me2/3 reading activity thus opposes the epigenetic drift and derepression of transposable elements associated with aging, placing HPL-2 in 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 for hpl-2, but the ground truth is anti_longevity. The model's reasoning is based on a general principle that HP1/heterochromatin maintenance should support longevity by silencing transposons and maintaining epigenetic stability. However, in C. elegans, hpl-2 loss-of-function actually extends lifespan, making it anti_longevity (its normal function opposes longevity). The model's mechanistic reasoning, while plausible in general terms, is incorrect for this specific gene in C. elegans. The model had moderate confidence (0.62) but still got it wrong. The reasoning failed to account for the specific experimental evidence in C. elegans where hpl-2 mutants show extended lifespan, possibly through effects on germline gene silencing or other pathways that when disrupted promote longevity.
Raw API responses
solver
{
"reasoning": "HPL-2 is a C. elegans HP1 (Heterochromatin Protein 1) homolog that reads H3K9me2/3 marks via its chromodomain, a hallmark of constitutive heterochromatin. By binding H3K9-methylated chromatin, HPL-2 helps maintain transcriptional silencing of repetitive elements and transposons, which is critical for genomic and epigenetic stability during aging. Loss of heterochromatin integrity and H3K9me3 marks is a well-documented feature of aging in C. elegans and other organisms. HPL-2 also participates in silencing of germline genes in somatic tissues; its normal function preserves the somatic epigenetic identity that supports longevity. Maintenance of repressive chromatin states through H3K9me2/3 reading activity thus opposes the epigenetic drift and derepression of transposable elements associated with aging, placing HPL-2 in a pro-longevity role.",
"confidence": 0.62,
"key_pathways": [
"H3K9me2/3-heterochromatin maintenance",
"HP1-mediated transcriptional silencing",
"transposon/repeat element repression"
],
"mechanism_class": "epigenetic_alterations",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity for hpl-2, but the ground truth is anti_longevity. The model's reasoning is based on a general principle that HP1/heterochromatin maintenance should support longevity by silencing transposons and maintaining epigenetic stability. However, in C. elegans, hpl-2 loss-of-function actually extends lifespan, making it anti_longevity (its normal function opposes longevity). The model's mechanistic reasoning, while plausible in general terms, is incorrect for this specific gene in C. elegans. The model had moderate confidence (0.62) but still got it wrong. The reasoning failed to account for the specific experimental evidence in C. elegans where hpl-2 mutants show extended lifespan, possibly through effects on germline gene silencing or other pathways that when disrupted promote longevity.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}