{"artifact_id":"L1-901","layer":"L1","title":"Epigenetic Reprogramming & Reverse Aging","domain":"Aging Biology","sub_domain":"Epigenetic Reprogramming","physics_fingerprint":{"intro":"Aging is, in part, a loss of epigenetic information — cells forget which genes to express. Transient partial reprogramming with Yamanaka factors (OSK) can reset the methylation landscape toward a youthful state and reverse biological-age clocks in vivo, without erasing cell identity.","title":"Epigenetic Reprogramming & Reverse Aging","domain":"Aging Biology","chapter":"Ch.13 Life Sciences & Aging","why_hard":"The window between rejuvenation and dedifferentiation (or tumorigenesis) is narrow, effects differ by tissue, and 'biological age' itself is measured by clocks we don't fully trust.","agent_idea":"An agent that designs reprogramming protocols (factors, dose, schedule) per cell type and predicts the age-reversal vs safety trade-off.","approaches":["Learn a causal map: reprogramming dose/duration → methylation state → biological age","Closed-loop control of OSK exposure that maximizes age reversal under identity-preservation constraints","Multi-tissue methylation foundation models that separate rejuvenation from dedifferentiation"],"sub_domain":"Epigenetic Reprogramming","forward_model":"Information-theoretic aging: biological age A(t) accumulates as epigenetic noise; transient OSK reprogramming u(t) drives dA/dt = k_dmg − k_rep·u(t), read out by a DNA-methylation clock.","benchmark_goal":"Given single-cell methylation before/after transient OSK across tissues, predict restored biological age within ~2 years while flagging any loss of cell identity.","challenge_blurb":"Restore a youthful epigenome with partial reprogramming — turn biological age down without losing cell identity.","challenge_group":"life","challenge_short":"Reverse Aging","grand_challenge":true,"governing_equation":"dA/dt = k_dmg − k_rep · u(t);   Age_bio = Clock(M_methylation)"},"observable_profile":{"unit":"biological years restored","floor":3.0,"metric":"years_reversed","sota_reference":"Partial OSK reprogramming (Lu et al., optic-nerve / Sinclair lab)"},"size_tiers":{"CpG_sites":[27000,450000,28000000],"cell_types":[1,8,40]},"hardness_fn":{"type":"grand_challenge","metric":"years_reversed","baseline":"Elastic-net DNAm clock (Horvath)","delta_tier":50},"initiator_dataset":[{"name":"Multi-tissue DNAm reprogramming atlas","weight":0.5,"ipfs_cid":null,"license_hash":null},{"name":"Horvath pan-tissue clock corpus","weight":0.3,"ipfs_cid":null,"license_hash":null},{"name":"OSK transient-induction time course","weight":0.2,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":5000.0,"chain_hash":null,"chain_tx_hash":null,"chain_block":null,"wp":{},"plain_intro":"Epigenetic Reprogramming & Reverse Aging is a problem in Aging Biology. The forward model maps the hidden the unknown quantity to a measurement. The inverse goal is to recover the the unknown quantity from the observed data."}