Aging as a consequence of misrepair -- a novel theory of aging

It is now increasingly realized that the underlying mechanism which governs aging (ageing) is a complex interplay of genetic regulation and damage-accumulation. “Aging as a result of accumulation of ‘faults’ on cellular and molecular levels”, has been proposed in the damage (fault)-accumulation theory. However, this theory fails to explain some aging phenotypes such as fibrosis and premature aging, since terms such as ‘damage’ and ‘fault’ are not specified. Therefore we introduce some crucial modifications of this theory and arrive at a novel theory: aging of the body is the result of accumulation of Misrepair of tissue. It emphasizes: a) it is Misrepair, not the original damage, that accumulates and leads to aging; and b) aging can occur at different levels, however aging of the body takes place necessarily on the tissue level, but not requiring the aging of cells/molecules. The Misrepair-accumulation theory introduced in the present paper unifies the understanding of the roles of environmental damage, repair, gene regulation, and multicellular structure in the aging process. This theory gives explanations for the aging phenotypes, premature aging, the difference of longevity in different species, and it is consistent with the physical view on complex systems.

💡 Research Summary

The paper critiques the traditional damage‑accumulation theory of aging for its vague use of “damage” and “fault” and its inability to explain phenotypes such as fibrosis, scar formation, and premature aging. It proposes a revised framework: aging is driven not by the original insults but by the cumulative “Misrepair” of tissues that follows each injury. Misrepair is defined as an imperfect restoration that replaces damaged structures with functionally adequate but structurally abnormal material (e.g., excess collagen, calcified deposits). While these substitutes preserve short‑term survival, they progressively degrade tissue elasticity, conductivity, and intercellular signaling, leading to systemic functional decline.

Key premises of the Misrepair‑accumulation theory are: (1) organisms have evolved sophisticated repair mechanisms, yet the probability of repair errors rises with age; (2) Misrepair creates permanent architectural changes that accumulate at the tissue level, constituting the primary substrate of organismal aging; (3) cellular and molecular damage ultimately manifests as tissue‑level Misrepair, making cellular senescence a secondary effect rather than the root cause.

The authors align this model with empirical observations. Skin wrinkling results from disordered collagen remodeling after repeated injury; organ fibrosis reflects repeated deposition of collagen in place of functional parenchyma; progeroid syndromes exhibit rapid loss of nuclear envelope integrity and DNA‑repair capacity, precipitating swift tissue disorganization—phenomena readily interpreted as accelerated Misrepair.

Cross‑species longevity differences are also reframed. Long‑lived species maintain higher fidelity repair pathways and lower Misrepair rates, whereas short‑lived species accrue structural errors more rapidly. This relationship can be expressed succinctly as “repair efficiency ≈ lifespan.”

From a physics of complex systems perspective, Misrepair corresponds to an increase in system entropy: each erroneous repair reduces network connectivity and lowers the free energy of the tissue ensemble. Thus aging emerges as an inevitable thermodynamic drift toward disorder, consistent with the authors’ claim that the theory dovetails with physical views of complex systems.

Finally, the paper suggests therapeutic implications. Rather than focusing solely on antioxidants or enhancing DNA repair, interventions should aim to minimize Misrepair—e.g., precise stem‑cell‑based regeneration, antifibrotic agents, or biomaterials that guide accurate matrix reconstruction. Development of quantitative Misrepair biomarkers (circulating collagen fragments, tissue stiffness metrics) is proposed as a priority for future research.

In sum, the Misrepair‑accumulation theory extends the damage‑accumulation paradigm by shifting the locus of aging from molecular lesions to persistent structural alterations at the tissue level, offering a unified explanation for diverse aging phenotypes and opening new avenues for anti‑aging strategies.