reb1

S. pombe

RNA polymerase I transcription termination factor/ RNA polymerase II transcription factor Reb1

What the model saw

Gene: reb1
Organism: Schizosaccharomyces pombe
Known functions: RNA polymerase I transcription termination factor/ RNA polymerase II transcription factor Reb1. DNA-binding transcription activator activity, RNA polymerase II-specific. DNA-binding transcription factor activity. RNA polymerase II cis-regulatory region sequence-specific DNA binding. protein binding. rDNA spacer replication fork barrier binding. sequence-specific DNA binding. transcription cis-regulatory region binding. transcription termination site sequence-specific DNA binding.

View unredacted entry

RNA polymerase I transcription termination factor/ RNA polymerase II transcription factor Reb1. DNA-binding transcription activator activity, RNA polymerase II-specific. DNA-binding transcription factor activity. RNA polymerase II cis-regulatory region sequence-specific DNA binding. protein binding. rDNA spacer replication fork barrier binding. sequence-specific DNA binding. transcription cis-regulatory region binding. transcription termination site sequence-specific DNA binding.

Solver output

Predicted influence

Anti-longevity

Confidence

62%

Mechanism

Genomic instability

Reasoning

Reb1 in S. pombe binds the rDNA spacer replication fork barrier (RFB), where it stalls replication forks to prevent collision with RNA Pol I transcription machinery. While this barrier activity is important for rDNA integrity, persistent replication fork stalling at Reb1-bound RFBs is a well-characterized source of genomic instability and DNA double-strand breaks at the rDNA locus. In yeast aging models, rDNA instability—including extrachromosomal rDNA circle (ERC) accumulation and recombination—is a primary driver of replicative aging. Additionally, Reb1's role as an RNA Pol I transcription termination factor promotes ribosomal RNA production, which feeds into TOR-mediated nutrient sensing and anabolic drive that is generally anti-longevity. The combination of rDNA replication fork barrier activity (promoting genomic instability at rDNA) and stimulation of rRNA transcription (boosting ribosome biogenesis) places Reb1 in a net anti-longevity role.

Key pathways

rDNA replication fork barrier / rDNA instabilityRNA polymerase I transcription termination / rRNA biogenesisRNA polymerase II transcriptional activation

Longevity influence

Anti-longevity

Lifespan effect

Increase

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

Answer

✓Correct

Mechanism

✓Correct

Reasoning quality

4/5

Failure mode

Correct

Notes

The model correctly predicted anti_longevity for reb1 in S. pombe. The mechanistic reasoning is plausible and well-constructed: it correctly identifies Reb1's role at the rDNA replication fork barrier as a source of genomic instability, and links rRNA transcription termination to ribosome biogenesis and TOR signaling. The reasoning draws on known yeast aging biology (rDNA instability, ERC accumulation) and applies it sensibly to S. pombe. The confidence of 0.62 is appropriately moderate. The mechanism class of "genomic_instability" is reasonable given the rDNA fork barrier role. One minor caveat: ERC accumulation is more established in S. cerevisiae than S. pombe, but the general logic still holds. Overall a solid prediction with good mechanistic reasoning.

Raw API responses

solver

{
  "reasoning": "Reb1 in S. pombe binds the rDNA spacer replication fork barrier (RFB), where it stalls replication forks to prevent collision with RNA Pol I transcription machinery. While this barrier activity is important for rDNA integrity, persistent replication fork stalling at Reb1-bound RFBs is a well-characterized source of genomic instability and DNA double-strand breaks at the rDNA locus. In yeast aging models, rDNA instability—including extrachromosomal rDNA circle (ERC) accumulation and recombination—is a primary driver of replicative aging. Additionally, Reb1's role as an RNA Pol I transcription termination factor promotes ribosomal RNA production, which feeds into TOR-mediated nutrient sensing and anabolic drive that is generally anti-longevity. The combination of rDNA replication fork barrier activity (promoting genomic instability at rDNA) and stimulation of rRNA transcription (boosting ribosome biogenesis) places Reb1 in a net anti-longevity role.",
  "confidence": 0.62,
  "key_pathways": [
    "rDNA replication fork barrier / rDNA instability",
    "RNA polymerase I transcription termination / rRNA biogenesis",
    "RNA polymerase II transcriptional activation"
  ],
  "mechanism_class": "genomic_instability",
  "longevity_influence": "anti_longevity"
}

advisor

{
  "notes": "The model correctly predicted anti_longevity for reb1 in S. pombe. The mechanistic reasoning is plausible and well-constructed: it correctly identifies Reb1's role at the rDNA replication fork barrier as a source of genomic instability, and links rRNA transcription termination to ribosome biogenesis and TOR signaling. The reasoning draws on known yeast aging biology (rDNA instability, ERC accumulation) and applies it sensibly to S. pombe. The confidence of 0.62 is appropriately moderate. The mechanism class of \"genomic_instability\" is reasonable given the rDNA fork barrier role. One minor caveat: ERC accumulation is more established in S. cerevisiae than S. pombe, but the general logic still holds. Overall a solid prediction with good mechanistic reasoning.",
  "failure_mode": "correct",
  "answer_correct": true,
  "mechanism_correct": true,
  "reasoning_quality": 4,
  "ground_truth_questionable": false
}