Bioethics in the Lab: Ethical Considerations of Working with Prokaryotes
A scientist finishes an experiment, destroying billions of E. coli DH5α cells to extract plasmid DNA. Hands smell of autoclaved LB broth; petri dishes head for disposal. No ethics committee approval, no formal consent—Russell and Burch’s 3Rs (replacement, reduction, refinement) apply only to eukaryotes. Prokaryotes remain unregulated.
This reflects a fundamental disconnect: science operates on models of reality, not reality itself. Human sensory limits—visible spectrum, lack of magnetic field perception—distort our assessment of life’s value. Bacteria navigating Earth’s geomagnetic lines display capabilities far beyond human experience.
Biomass as a Measure of Anthropocentrism
Total planetary biomass is 550 gigatons of carbon (Bar-On et al., PNAS, 2018). Distribution:
- Plants: 450 Gt (82%)
- Bacteria: 70 Gt (13%)
- Humans: 0.06 Gt (0.01%)
Homo sapiens is one pixel in a 10-megapixel image of the biosphere, holding an autoclave. Wild mammals make up just 4% of mammalian biomass (Greenspoon et al., PNAS, 2023); the rest is livestock (60%) and humans (36%). 70% of birds are chickens; 83 billion land animals are slaughtered annually (FAO, 2022).
Species extinction rates are 100–1,000 times higher than background levels (Ceballos et al., 2015). Human bodies contain 1.3 times more bacterial cells than human ones (Sender et al., 2016).
The Thermodynamics of Life and the Minimal Genome
In What Is Life? (1944), Schrödinger introduced negentropy: organisms consume order and emit chaos. Jeremy England (MIT, 2013) expanded this into dissipative adaptation theory—matter self-organizes under energy flow to efficiently dissipate it.
JCVI-syn3.0 (Venter, 2016) is a synthetic cell with 473 genes, the minimal set for viability. 149 genes (31.5%) have unknown function. Destroying such a system with a lytic buffer is wiping out a machine that cannot be rebuilt from scratch.
Lab strains (E. coli, Lactococcus) are domesticated: genomically reduced, dependent on LB media and 37°C. They cannot survive in nature—like farm animals.
Ethical Criteria: Intelligence or Metabolism?
Thought experiment: E. coli is alive (metabolism, evolution from LUCA 4 billion years ago), but lacks intelligence. An LLM like ChatGPT shows intelligence without metabolism.
- If the criterion is intelligence, GPT > bacterium > many animals.
- If the criterion is life (negentropy), bacterium > GPT.
Historically, ethics has expanded: Aristotle (slaves below Greeks), Descartes (animals as machines), Bentham (suffering), Singer (speciesism), Taylor (biocentrism, 1986). Bacteria entered ethical consideration only in the 2020s.
Counterarguments and Practical Takeaways
Biocentrism taken to extremes paralyzes action: soap is genocide, immunity (100 billion neutrophils daily) is murder. Life inherently involves killing life.
The difference lies in choice: a lion kills out of necessity; a scientist can:
- Reduce culture volume (1 colony instead of 6).
- Optimize protocols.
- Question whether the experiment is truly necessary.
‘Uncomfortable’ isn’t invalid. Heliocentrism was uncomfortable—but true. Anthropocentrism is the ethics equivalent of geocentrism.
What Matters
- Human biomass is 0.01% of global total, yet dominates decisions about life and death.
- 31.5% of genes in the minimal cell are unknown—highlighting gaps in understanding.
- Extending ethical consideration to prokaryotes is the next step after biocentrism.
- Practice: reducing lab protocols lowers scale without harming science.
- Thermodynamics frames life as an inevitable process, not a miracle.
— Editorial Team
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