Xrcc5
M. musculus
X-ray repair complementing 5
What the model saw
Gene: Xrcc5 Organism: Mus musculus Known functions: X-ray repair complementing 5. DNA repair protein Ku80; X-ray repair cross-complementing protein 5. 3'-5' DNA helicase activity. 5'-deoxyribose-5-phosphate lyase activity. ATP hydrolysis activity. ATP-dependent activity, acting on DNA. DNA binding. DNA end binding. DNA helicase activity. RNA binding. U3 snoRNA binding. class I DNA-(apurinic or apyrimidinic site) endonuclease activity. damaged DNA binding. double-stranded DNA binding. double-stranded telomeric DNA binding. protein binding. protein-containing complex binding. telomeric repeat DNA binding. transcription cis-regulatory region binding. ubiquitin protein ligase binding.
View unredacted entry
X-ray repair complementing 5. DNA repair protein Ku80; X-ray repair cross-complementing protein 5. 3'-5' DNA helicase activity. 5'-deoxyribose-5-phosphate lyase activity. ATP hydrolysis activity. ATP-dependent activity, acting on DNA. DNA binding. DNA end binding. DNA helicase activity. RNA binding. U3 snoRNA binding. class I DNA-(apurinic or apyrimidinic site) endonuclease activity. damaged DNA binding. double-stranded DNA binding. double-stranded telomeric DNA binding. protein binding. protein-containing complex binding. telomeric repeat DNA binding. transcription cis-regulatory region binding. ubiquitin protein ligase binding.
Solver output
Xrcc5 (Ku80) is a core component of the Ku70/Ku80 heterodimer, which is the primary sensor and initiator of the non-homologous end joining (NHEJ) pathway for DNA double-strand break (DSB) repair. By binding DNA ends and recruiting DNA-PKcs and other NHEJ factors, Ku80 enables faithful repair of DSBs that would otherwise lead to chromosomal rearrangements, mutations, and genomic instability — a primary hallmark of aging. Its double-stranded telomeric DNA binding and telomeric repeat DNA binding activities also implicate it in telomere maintenance, protecting against telomere attrition. Mice with Ku80 knockout (Xrcc5−/−) exhibit dramatically accelerated aging phenotypes including early senescence, osteoporosis, and shortened lifespan, directly demonstrating that the normal function of this gene opposes aging. The ATP-dependent helicase and DNA end-binding activities are mechanistically essential for NHEJ-mediated DSB repair, placing Ku80 firmly in the pro-longevity category through suppression of genomic instability.
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 correctly predicted pro_longevity for Xrcc5/Ku80. The mechanistic reasoning is excellent and accurate: Ku80 is indeed a core NHEJ component, Ku80 knockout mice do show accelerated aging phenotypes and shortened lifespan, and the telomere maintenance role is also correctly identified. The model correctly identifies the genomic instability mechanism class and provides detailed, accurate pathway information. High confidence (0.82) is appropriate given the well-established literature on Ku80 and aging.
Raw API responses
solver
{
"reasoning": "Xrcc5 (Ku80) is a core component of the Ku70/Ku80 heterodimer, which is the primary sensor and initiator of the non-homologous end joining (NHEJ) pathway for DNA double-strand break (DSB) repair. By binding DNA ends and recruiting DNA-PKcs and other NHEJ factors, Ku80 enables faithful repair of DSBs that would otherwise lead to chromosomal rearrangements, mutations, and genomic instability — a primary hallmark of aging. Its double-stranded telomeric DNA binding and telomeric repeat DNA binding activities also implicate it in telomere maintenance, protecting against telomere attrition. Mice with Ku80 knockout (Xrcc5−/−) exhibit dramatically accelerated aging phenotypes including early senescence, osteoporosis, and shortened lifespan, directly demonstrating that the normal function of this gene opposes aging. The ATP-dependent helicase and DNA end-binding activities are mechanistically essential for NHEJ-mediated DSB repair, placing Ku80 firmly in the pro-longevity category through suppression of genomic instability.",
"confidence": 0.82,
"key_pathways": [
"Non-homologous end joining (NHEJ) DNA double-strand break repair",
"Telomere length maintenance and protection",
"DNA damage response signaling"
],
"mechanism_class": "genomic_instability",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly predicted pro_longevity for Xrcc5/Ku80. The mechanistic reasoning is excellent and accurate: Ku80 is indeed a core NHEJ component, Ku80 knockout mice do show accelerated aging phenotypes and shortened lifespan, and the telomere maintenance role is also correctly identified. The model correctly identifies the genomic instability mechanism class and provides detailed, accurate pathway information. High confidence (0.82) is appropriate given the well-established literature on Ku80 and aging.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 5,
"ground_truth_questionable": false
}