Following the 2024 Technical Report on mirror life, policymakers have begun examining the evidence base to decide on governance measures. However, they face a precarious trade-off: indiscriminately filling knowledge gaps risks accelerating the very threat they hope to prevent. The Centre for Long-Term Resilience has developed a framework to distinguish necessary, safe research from dual-use research of concern (DURC). This blog post and accompanying spreadsheet identify specific, safe knowledge gaps to fill for improving preparedness without lowering the barriers to creating mirror life.

Background

In December 2024, a group of 38 scientists released a 300-page technical report as an accompaniment to a Policy Forum publication in the journal Science, examining the potential creation of mirror organisms—synthetic life where macromolecules adopt the opposite chirality to nature. This report outlined severe risks: mirror life would be difficult to control, impossible to eradicate if released, and potentially devastating to global ecosystems.

There is a general consensus within the scientific community that research that might directly lead to the creation of mirror life should be prevented. However, following a January 2025 Roundtable held by the UK government and attended by CLTR’s Dr Paul-Enguerrand Fady, it became evident that while the risks are considered real, policymakers feel the current evidence base may be insufficient to support decisive regulatory action.

Evidence Dilemma

Further research could inform policy decisions on governance and prepare for potential release scenarios. Mirror life is distinct among scientific unknowns. Because enantiomers possess identical physical properties but reversed spatial arrangements, we can infer many of their likely interactions from first principles, even without creating the organism. Yet, despite this theoretical grounding, the technical report details numerous gaps in our understanding.

Indiscriminately filling these gaps poses two distinct dangers: accelerating the development of dangerous capabilities or generating misleading data that promotes false security. Many “knowledge gaps” effectively represent the technical barriers currently preventing the creation of mirror bacteria. Research explicitly designed to close these gaps can lower barriers to creation and constitute Dual-Use Research of Concern (DURC). For instance, optimising genome-scale mirror DNA synthesis and assembly does not simply add to an evidence base; it actively paves the way for the creation of mirror organisms.

Research explicitly designed to close these gaps can lower the barriers to creation. Therefore, we need a rigorous method to decide which experiments, if any, should be conducted, given the extreme risks.

A Framework for Decision Making

Consequently, the Centre for Long-Term Resilience has reviewed the technical report in depth. Our aim was not merely to list gaps, but to provide a framework for analysing mirror life unknowns to determine whether addressing them is safe or necessary.

The technical report remains the most comprehensive assessment of the severe potential risks arising from the creation of mirror organisms, and was hence the focus of this undertaking. However, the framework we have created can be used to assess new gaps in the evidence base that are subsequently identified and to decide whether research to address them should be conducted.

In this spreadsheet, we have:

1. Collated every instance of an evidence gap identified in the technical report.
2. Classified gaps by type (e.g., human health, animal immunity, environmental survival, etc).
3. Assessed the utility of potential experiments in filling these gaps.
4. Evaluated the extent to which proposed research constitutes “dual-use research of concern” (DURC) or may be misleading.

The Precautionary Principle

We recognise a valid scepticism regarding the need for any further evidence. When confronting novel technologies that pose threats of catastrophic, irreversible harm, demanding complete scientific certainty before regulation is a recipe for disaster.

Uncertainty cannot be used as a reason to postpone measures to prevent irreversible harm. In such cases, 175 countries, including the UK, are bound by the Precautionary Principle (Principle 15) of the 1992 Rio Declaration, which states: “Where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation.”

Priorities for Safe Research

On our review of the evidence and the potential benefits of filling knowledge gaps, we do not believe the experiments marked “Yes” in our analysis need to be conducted before political decisions are made as they are unlikely to change the scientific consensus. We propose a shortlist of high-impact, lower-risk research that could unlock key insights for preparedness and policy while recognising constrained funding:

1. Conduct in vivo infection modelling and drug characterisation (ADMET, PK/PD, dose-response) of mirror antibiotics against established natural-chirality pathogens
2. Measure immune pathway activation in human cell lines expressing immune receptors when these cells are exposed to mirror versus natural-chirality antigens, e.g. cells expressing TLR2 or TLR4 exposed to mirror versus natural-chirality lipopeptides or lipopolysaccharide)
3. Perform in vitro binding kinetics experiment between human immune receptors and mirror antigens (as above) e.g. via surface-plasmon-resonance, isothermal titration calorimetry, or differential scanning fluorimetry
4. Draw on existing animal studies of spiegelmer administration to observe the ADMET, PK/PD, and other key pharmacological parameters. This includes phagocytosis and trafficking of spiegelmer debris.
5. Calculate the likely quantity of countermeasures required to be deployed in order to eradicate mirror bacteria under various scenarios, and determine the costs of doing so alongside the viability of manufacturing these quantities.

We believe that data in these specific areas—medical countermeasures, immune stimulation, and economic implications—would strengthen the evidence base for policymakers without lowering the barriers to creation.

Notably, we exclude self-replicating biological countermeasures (e.g., mirror phages) from this priority list, as their development requires the same enabling technologies needed to create mirror pathogens.

A Note on Proxies

A recurring suggestion for research is to use natural-chirality pathogenic proxies for mirror bacteria. This approach suffers from clear limitations. Because natural-chirality proxies retain chiral MAMPs (like peptidoglycan and LPS), they will trigger innate immune responses that mirror bacteria would likely not. A proxy failing to cause infection therefore provides dangerously misleading safety data. Furthermore, nutrient availability for natural-chirality proxies differs materially from that of mirror bacteria. Consequently, failure of a proxy to cause infection could provide false reassurance. Any research based on proxies must be accompanied by strong caveats.

Conclusion

Ultimately, this framework and spreadsheet are designed to help researchers and policymakers understand where gaps exist and, critically, which are safe to explore. However, additional evidence is unlikely to change the scientific consensus on the dangers of mirror life, and governance decisions can still be taken in the absence of further research. We reiterate our belief that research directly leading to the creation of mirror life is dangerous and should not be funded or permitted.

Suggested citation: Fady, Paul-Enguerrand, et al. 2025. ‘Gap consolidation of the mirror life evidence base’. The Centre for Long-Term Resilience. doi.org/10.71172/f168-g3s2