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'Bacterial Programmed Cell Death': cellular altruism or genetic selfism?
Bhaskar Chandra Mohan Ramisetty1, Pavithra Anantharaman Sudhakari1
1Laboratory of Molecular Biology and Evolution, 312@ASK1, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, India 613401.
Programmed cell death (PCD) in bacteria is re-examined. The authors propose that bacterial PCD is driven by genetic selfism, not cellular altruism, particularly in systems like Restriction-Modification and Toxin-Antitoxin.
Area of Science:
- Microbiology
- Evolutionary Biology
- Genetics
Background:
- Cell-dependent propagation drives life, with cellular death eliminating entities.
- Programmed cell death (PCD) is gene-dependent self-inflicted death.
- PCD in multicellular organisms benefits the organism, but its selection in unicellular bacteria is debated.
Purpose of the Study:
- To reconceptualize bacterial programmed cell death (PCD).
- To explore the evolutionary drivers of PCD in free-living bacteria.
- To propose a gene-centered view of bacterial PCD.
Main Methods:
- Literature review and conceptual analysis.
- Reinterpretation of existing evidence on bacterial PCD.
- Focus on genetic selfism versus cellular altruism.
Main Results:
- Bacterial PCD may not be altruistic but rather a manifestation of genetic selfism.
- The death of a bacterial cell can serve the propagation of specific selfish genes.
- Restriction-Modification and Toxin-Antitoxin systems are proposed as examples of genetic selfism.
Conclusions:
- Genetic selfism offers a compelling alternative to cellular altruism in explaining bacterial PCD.
- This gene-centered perspective better accounts for the evolution of cell-death genes in unicellular organisms.
- Further research should investigate PCD-like phenomena through the lens of genetic selfism.
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