SSD1

S. cerevisiae

mRNA-binding translational repressor SSD1

What the model saw

Gene: SSD1
Organism: Saccharomyces cerevisiae
Known functions: mRNA-binding translational repressor SSD1. 3'-5'-RNA exonuclease activity. RNA binding. RNA nuclease activity. mRNA 3'-UTR binding. mRNA 5'-UTR binding. mRNA binding. mRNA regulatory element binding translation repressor activity. protein binding.

View unredacted entry

mRNA-binding translational repressor SSD1. 3'-5'-RNA exonuclease activity. RNA binding. RNA nuclease activity. mRNA 3'-UTR binding. mRNA 5'-UTR binding. mRNA binding. mRNA regulatory element binding translation repressor activity. protein binding.

Solver output

Predicted influence

Pro-longevity

Confidence

72%

Mechanism

Loss of proteostasis

Reasoning

SSD1 encodes an mRNA-binding translational repressor that binds both 5'- and 3'-UTRs of target mRNAs, suppressing their translation and contributing to post-transcriptional gene regulation. In yeast, SSD1 is a well-established modifier of replicative and chronological lifespan; its presence suppresses translation of cell wall and stress-response transcripts, and ssd1Δ strains are short-lived. By acting as a translational repressor with 3'-5' RNA exonuclease activity, SSD1 helps maintain proteostasis by limiting the production of potentially toxic or misfolded proteins from specific mRNA targets. SSD1 also interacts with the TOR/Sch9 nutrient-sensing pathway, where it mediates downstream effects on stress resistance and longevity. Loss of SSD1 sensitizes cells to multiple stresses and shortens lifespan, indicating its normal function is pro-longevity. The mRNA regulatory and nuclease activities together support controlled protein output, a key aspect of proteostatic maintenance during aging.

Key pathways

mRNA translational repression via 5'/3'-UTR bindingTOR/Sch9 nutrient-sensing and stress-response pathwaypost-transcriptional proteostasis via 3'-5' RNA exonuclease activity

Longevity influence

Unclear

Lifespan effect

Increase and Decrease

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

✗Incorrect

Mechanism

✗Incorrect

Reasoning quality

3/5

Failure mode

Confident wrong

Notes

The ground truth classifies SSD1's longevity influence as "unclear," but the model confidently predicts "pro_longevity" with 0.72 confidence. The model's reasoning is plausible and draws on real biology (SSD1 as a translational repressor, interactions with TOR/Sch9, stress resistance), but the actual evidence in the literature is apparently ambiguous enough that GenAge curators marked it as unclear. The model overstates certainty and picks a definitive direction when the evidence doesn't support one. The mechanistic reasoning about proteostasis and TOR pathway is partially relevant but may not accurately reflect the primary mechanism by which SSD1 affects lifespan. The claim that "ssd1Δ strains are short-lived" may be context-dependent (replicative vs. chronological lifespan, strain background), which is likely why the curators marked it as unclear rather than definitively pro-longevity.

Raw API responses

solver

{
  "reasoning": "SSD1 encodes an mRNA-binding translational repressor that binds both 5'- and 3'-UTRs of target mRNAs, suppressing their translation and contributing to post-transcriptional gene regulation. In yeast, SSD1 is a well-established modifier of replicative and chronological lifespan; its presence suppresses translation of cell wall and stress-response transcripts, and ssd1Δ strains are short-lived. By acting as a translational repressor with 3'-5' RNA exonuclease activity, SSD1 helps maintain proteostasis by limiting the production of potentially toxic or misfolded proteins from specific mRNA targets. SSD1 also interacts with the TOR/Sch9 nutrient-sensing pathway, where it mediates downstream effects on stress resistance and longevity. Loss of SSD1 sensitizes cells to multiple stresses and shortens lifespan, indicating its normal function is pro-longevity. The mRNA regulatory and nuclease activities together support controlled protein output, a key aspect of proteostatic maintenance during aging.",
  "confidence": 0.72,
  "key_pathways": [
    "mRNA translational repression via 5'/3'-UTR binding",
    "TOR/Sch9 nutrient-sensing and stress-response pathway",
    "post-transcriptional proteostasis via 3'-5' RNA exonuclease activity"
  ],
  "mechanism_class": "loss_of_proteostasis",
  "longevity_influence": "pro_longevity"
}

advisor

{
  "notes": "The ground truth classifies SSD1's longevity influence as \"unclear,\" but the model confidently predicts \"pro_longevity\" with 0.72 confidence. The model's reasoning is plausible and draws on real biology (SSD1 as a translational repressor, interactions with TOR/Sch9, stress resistance), but the actual evidence in the literature is apparently ambiguous enough that GenAge curators marked it as unclear. The model overstates certainty and picks a definitive direction when the evidence doesn't support one. The mechanistic reasoning about proteostasis and TOR pathway is partially relevant but may not accurately reflect the primary mechanism by which SSD1 affects lifespan. The claim that \"ssd1Δ strains are short-lived\" may be context-dependent (replicative vs. chronological lifespan, strain background), which is likely why the curators marked it as unclear rather than definitively pro-longevity.",
  "failure_mode": "confident_wrong",
  "answer_correct": false,
  "mechanism_correct": false,
  "reasoning_quality": 3,
  "ground_truth_questionable": false
}