Senescence in RASopathies, a possible novel contributor to a complex pathophenoype
Melanie Engler1, Miray Fidan1, Sayantan Nandi1
1Institute of Comparative Molecular Endocrinology, Ulm University, Helmholtzstr. 8/1, 89081, Ulm, Germany.
Mechanisms of Ageing and Development
|December 14, 2020
Summary
Cellular senescence, a cell cycle arrest, plays dual roles in cancer and development. In RASopathies, senescence may paradoxically protect against tumors while contributing to premature aging and reduced lifespan.
Area of Science:
- Cellular and Molecular Biology
- Developmental Biology
- Genetics
Background:
- Cellular senescence is a state of irreversible cell cycle arrest triggered by various stressors.
- Initially recognized for its role in tumor suppression (oncogene-induced senescence), senescence is now understood to be crucial in development, tissue repair, and aging.
- Germline mutations in RAS-MAPK pathway genes cause RASopathies, a group of developmental disorders, contrasting with somatic mutations linked to cancer.
Purpose of the Study:
- To review the multifaceted role of senescence in organismal homeostasis.
- To elucidate the current understanding of senescence in RASopathies.
- To explore how RASopathy mutations might induce chronic, age-dependent senescence, impacting disease phenotype and longevity.
Main Methods:
- Literature review of senescence research.
- Analysis of the dual role of senescence in cancer and developmental disorders.
- Examination of specific RASopathy mutations and their link to chronic senescence.
Main Results:
- Senescence exhibits context-dependent outcomes, acting as both a tumor suppressor and a contributor to aging phenotypes.
- In RASopathies, senescence may offer protection against cancer but potentially drives premature aging, as seen in Costello syndrome.
- RASopathy-associated mutations can induce age-dependent chronic senescence, exacerbating disease and shortening lifespan.
Conclusions:
- Senescence is a critical biological process with diverse roles in health and disease.
- Understanding senescence in RASopathies is key to explaining their complex clinical manifestations, including premature aging.
- Targeting age-dependent chronic senescence may offer therapeutic strategies for RASopathies.
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