What is mirror bacteria? Scientists warn of unprecedented threat

Scientists warn that mirror bacteria, engineered from molecular mirror images found in nature, could pose an "unprecedented risk" to life on Earth. This concern was raised by an international team of Nobel laureates and experts in the journal *Science*.

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mirror bacteria (X/airnewsalerts (Representative Image))

A chilling scenario has emerged from a recent scientific report, highlighting concerns about lab-engineered "mirror bacteria" potentially triggering an uncontrollable global pandemic. Unlike science fiction plots, this warning comes from a team of international experts, including two Nobel laureates, who have drawn attention to the catastrophic implications of such synthetic organisms.

“The threat we’re talking about is unprecedented,” said Professor Vaughn Cooper, an evolutionary biologist from the University of Pittsburgh, in an interview with The Guardian. “Mirror bacteria would likely evade many human, animal, and plant immune system responses and, in each case, cause lethal infections that would spread without check.”

But what exactly are mirror bacteria, and why are scientists raising the alarm? Let’s explore.

What are mirror bacteria?

Life on Earth is built on fundamental biomolecules like DNA, proteins, and carbohydrates, which exhibit a unique property known as chirality, or structural asymmetry. Much like human hands, these molecules exist in left- and right-handed forms, which are mirror images of one another.

For instance, DNA and RNA molecules in nature are right-handed, while proteins are composed of left-handed amino acids. This chirality dictates how these molecules interact with their surroundings and drives the chemistry of life as we know it.

Mirror bacteria, however, are an entirely synthetic form of life created in laboratories. These organisms are engineered with reversed-handed molecules—essentially flipping the chirality of their components.

Why is this concerning?

The reversed chirality of mirror bacteria could make them completely undetectable to natural immune systems across humans, animals, and plants. In such a scenario, these lab-made pathogens could trigger lethal infections, spreading uncontrollably due to the inability of natural defenses to recognize or combat them.

Scientists warn that unchecked research and accidental leaks involving mirror bacteria could lead to an unprecedented global health crisis.