Scientists today are exploring powerful new tools. mRNA technology, best known from COVID-19 vaccines, delivers instructions to cells and has opened new paths in vaccines and cancer treatment. RNA interference (RNAi) and microRNAs (miRNAs) do not change DNA, but they control how genes are read.

  A single miRNA can affect hundreds of genes at once, turning whole networks on or off.

  CRISPR–Cas9 goes further, cutting and editing DNA with the possibility of permanently correcting mutations.

  The potential is enormous. These methods could help treat cancer, rare genetic conditions, or repair damaged brain circuits in illnesses such as depression, PTSD, Parkinson’s, or Alzheimer’s.

  Research has already begun to examine miRNA signatures linked to trauma and stress, with the hope of reducing fear responses or preventing chronic PTSD. In animal studies, altering specific miRNAs in brain regions like the amygdala has blunted exaggerated fear and improved stress resilience, while experimental therapies are exploring whether exosomal miRNAs could restore balance in serotonin and dopamine pathways.

  But the risks are just as real. In 2016, the first human trial of a miRNA-based drug, MRX34, was stopped after patients died from immune reactions. Meanwhile, CRISPR still raises concerns about off-target effects, heritable changes, and how far human editing should go.

  Stolen from its rightful author, this tale is not meant to be on Amazon; report any sightings.

  There is also an ethical concern. If RNA tools can change memory, emotion, or empathy by altering brain pathways, what happens if they are used for control instead of healing? Vulnerable groups — such as refugees, detainees, or patients without legal protection — could be the first exposed to these experiments without a real choice.

  Around the world, countries are drawing different lines on gene editing. In Australia, a citizens’ jury concluded that gene editing should only be used to reduce suffering and improve quality of life, never for enhancement. In the UK, another citizens’ jury supported embryo editing for severe illness but only under strict regulation. Switzerland accepts somatic (non-heritable) editing but remains divided on germline use, emphasizing autonomy and legal safeguards. In the US, most people support gene editing to treat serious disease, but support falls when it comes to enhancements or heritable changes. Across much of Europe, the Oviedo Convention bans heritable editing altogether, while Canada enforces criminal penalties for the same. China, after the 2018 CRISPR babies scandal, imposed strict new regulations but continues to lead in somatic gene-editing research. Meanwhile, global bodies such as the WHO and UNESCO call for shared standards and oversight, warning that the risks cannot be managed by nations in isolation.

  If you had the chance to decide, would you allow research like this to continue, or would you draw the line and restrict it?

  Please comment.

  Scientific and medical

  

  
• FirstWordPharma (2016) Mirna Therapeutics halts Phase 1 clinical study of MRX34, 20 September. Available at:


  
• He, Y.N. (2025) ‘Exosomal microRNAs in common mental disorders’, World Journal of Psychiatry, 15(4), pp. 621–635. Available at:


  
• Nature Biotechnology (2024) ‘What will it take to get miRNA therapies to market?’, Nature Biotechnology, 42, pp. 1492–1494. Available at:


  
• UC Davis Health (2025) Do microRNAs hold the key to psychiatric and neurodegenerative disorders?, 2 June. Available at:


  
• Zhang, S. (2021) ‘The risks of miRNA therapeutics: In a drug target context’, Drug Discovery Today, 26(2), pp. 460–467. Available at:


  

  

  
• Zhou, J. et al. (2014) ‘Dysregulation in microRNA expression is associated with alterations in immune functions in combat veterans with post-traumatic stress disorder’, PLOS ONE, 9(4), e94075. Available at: doi:10.1371/journal.pone.0094075


  
• Martin, C.G. et al. (2017) ‘Circulating microRNAs associated with posttraumatic stress disorder in military veterans’, Journal Name, [details].


  
• Yang, R. et al. (2025) ‘Long?term miRNA changes predicting resiliency factors’, International Journal of Molecular Sciences, 26(11), 5195.


  
• Zhu, Z. (2023) ‘Recent advances in the role of miRNAs in post?traumatic stress disorder and traumatic brain injury’, Molecular Psychiatry.


  

  Ethical and global governance

  

  
• Australian Department of Health (2023) Is human gene editing good for our health? A citizens’ jury speaks, 10 March. Available at:


  
• University of Cambridge (2022) Citizens’ Jury on Human Embryo Editing reports its findings, 21 July. Available at:


  
• Swiss Academies of Arts and Sciences (2024) Attitudes towards genome editing in Switzerland: public and expert perspectives. Available at:


  
• Pew Research Center (2022) Americans are closely divided over editing a baby’s genes to reduce serious health risk, 17 March. Available at:


  
• Council of Europe (1997) Convention on Human Rights and Biomedicine (Oviedo Convention). Available at:


  
• Government of Canada (2004) Assisted Human Reproduction Act, S.C. 2004, c. 2. Available at:


  
• Cyranoski, D. (2019) ‘China’s CRISPR twins: what we know so far’, Nature, 566(7745), pp. 440–442. doi:10.1038/d41586-019-01382-0


  
• World Health Organization (2021) Human genome editing: recommendations. Geneva: WHO Expert Advisory Committee. Available at:


  
• UNESCO (2015) Report of the IBC on Updating Its Reflection on the Human Genome and Human Rights. Paris: United Nations Educational, Scientific and Cultural Organization. Available at: