Tardigrades survive extreme conditions through a cryogenic hibernation state called cryptobiosis, which halts their metabolic processes and protects them from death by dehydration, radiation, or extreme temperatures.
This tiny organism, measurable in millimeters, is able to withstand temperatures ranging from -273°C to over 150°C, ionizing radiation 1,000 times greater than what humans can tolerate, and the vacuum of outer space. Their survival is due to unique biological mechanisms that make them one of the most resilient organisms known.
Survival mechanisms
- Cryptobiosis: By losing almost all of their moisture, tardigrades reduce their cellular activity to undetectable levels, avoiding damage from freezing or dehydration.
- Protective proteins (tardigrade-specific proteins): These molecules stabilize their cellular structures and membranes against thermal changes and radiation.
- DNA repair: They possess efficient enzymes that correct genetic damage caused by radiation, something unusual in microscopic organisms.
- Trehalose synthesis: A sugar that forms a protective barrier between proteins and the environment, preventing cellular denaturation.
Studies show that tardigrades can reactivate after decades in a state of cryptobiosis, as long as their moisture is restored. They have survived space experiments, withstanding cosmic radiation and the absence of atmosphere, and their biological capabilities remain a field of research for applications in medicine, biotechnology, and the preservation of human tissue.
¡Qué asombroso que estos diminutos organismos puedan sobrevivir a temperaturas y radiaciones extremas!
¿Cómo logran los tardígrados entrar en ese estado de cibernosis que los protege? Me encanta la increíble resistencia de la naturaleza.