Vampire: Scientists have found a fish, which threat the sunlight
Biologists have discovered in the caves of Somalia fish, in cells where there is no system responsible for repairing small DNA mutations, which makes sunlight for this fish are deadly, the article was published in the journal Current Biology.
“These fish somehow lost one of the most ancient parts of the system to repair DNA, which is present in almost all living beings. Interestingly, something similar happened, only with another group of animals – placental mammals. It seems to me, says that our ancestors lived in darkness,” said Nicholas Foulkes from the Karlsruhe Institute of Technology in Germany.
Folks and his colleagues accidentally discovered a species of animals that are suffering from “xeroderma pigmentosum” is a rare genetic disease arising from breakages in genes, often found in humans. These mutations make the light of the Sun is extremely dangerous for people, as even a short stay on the street can cause mass destruction of skin cells and lead to the development of aggressive forms of cancer. The carriers of these genes do not usually live up to 18 years, they are often called “children of the moon” or “vampires.”
Scientists studied the genomes of fish living in the cave waters. It turned out that fish Phreatichthys andruzzii in Somalia have a few oddities. Scientists have discovered that the system repair DNA in the cells of these creatures did not react to increases and decreases in the level of illumination of the aquarium, always remaining in the “off” state. The researchers also analyzed the structure of fish genes responsible for repairing DNA, and found that they were damaged as a result of changes in the structure of neighboring properties, which affect their readability.
Such features are not characteristic of other cave fish, Phreatichthys andruzzii sharply react to changes in light levels and activate genes associated with the protection of the genome from UV light.
Experiments have shown that fish die a few days after exposure to light or irradiation of even small doses of ultraviolet light.
Phreatichthys andruzzii is a species of cyprinid fish adapted to cave. Fish are blind. It is believed that the species evolved in a cave environment about two million years.
According to the materials: ren.tv