Scientists discover mysterious 'alien' life forms in human body

In a groundbreaking discovery, scientists have identified organisms inside the human body that defy everything we thought we knew about life. A Stanford University research team, led by Dr. Ivan Zheludev, has found evidence of peculiar RNA-based life forms in the human microbiome. Published in 2024, the study introduces these organisms as “Obelisks,” which are unlike any known life forms on Earth.

What Are Obelisks?

The researchers analysed RNA sequences from human gut samples using metatranscriptomic analysis. They discovered over 1,000 unusual base pairs that don’t match any known genetic patterns. These Obelisks, present in 10% of microbiome samples, have circular genomes with rod-like structures and produce a novel protein called Oblins. However, the exact role of these proteins remains unknown.

Where Are They Found?

Obelisks appear in multiple parts of the human microbiome, including the gut and oral microbiomes. Surprisingly, while only 7% of stool samples contained Obelisks, they were present in up to 50% of oral samples, suggesting they are more widespread than initially thought. Additionally, some Obelisks were found inside Streptococcus sanguinis, a typically harmless bacterial species. These organisms persist in the body for over 300 days, leaving researchers to question whether they are permanent residents or transient visitors.

Are They Truly Alien?

Though the term "alien" might evoke images of extraterrestrial beings, these organisms are not from another planet. Instead, they are "alien" to life as we know it due to their unique RNA-based structure and self-replicating abilities. This discovery could provide profound insights into the origins of life and evolution.

The question remains: Have these organisms been coexisting with us unnoticed, or do they represent an entirely new chapter in the story of life?