Now On the Origin-of-Life Menu: An alternative to PRIMORDIAL SOUP

DNA has been shown to survive entry into the Earth’s atmosphere.

The media release is below:

DNA survives critical entry into Earth’s atmosphere

Applied to the outer shell of the payload section of a rocket using pipettes, small, double-stranded DNA molecules flew into space from Earth and back again. After the launch, space flight, re-entry into Earth’s atmosphere and landing, the so-called plasmid DNA molecules were still found on all the application points on the rocket from the TEXUS-49 mission. And this was not the only surprise: For the most part, the DNA salvaged was even still able to transfer genetic information to bacterial and connective tissue cells. “This study provides experimental evidence that the DNA’s genetic information is essentially capable of surviving the extreme conditions of space and the re-entry into Earth’s dense atmosphere,” says study head Professor Oliver Ullrich from the University of Zurich’s Institute of Anatomy.

Spontaneous second mission

The experiment called DARE (DNA atmospheric re-entry experiment) resulted from a spontaneous idea: UZH scientists Dr. Cora Thiel and Professor Ullrich were conducting experiments on the TEXUS-49 mission to study the role of gravity in the regulation of gene expression in human cells using remote-controlled hardware inside the rocket’s payload. During the mission preparations, they began to wonder whether the outer structure of the rocket might also be suitable for stability tests on so-called biosignatures. “Biosignatures are molecules that can prove the existence of past or present extraterrestrial life,” explains Dr. Thiel. And so the two UZH researchers launched a small second mission at the European rocket station Esrange in Kiruna, north of the Arctic Circle.

DNA survives the most extreme conditions

The quickly conceived additional experiment was originally supposed to be a pretest to check the stability of biomarkers during spaceflight and re-entry into the atmosphere. Dr. Thiel did not expect the results it produced: “We were completely surprised to find so much intact and functionally active DNA.” The study reveals that genetic information from the DNA can essentially withstand the most extreme conditions.

Various scientists believe that DNA could certainly reach us from outer space as Earth is not insulated: in extraterrestrial material made of dust and meteorites, for instance, around 100 tons of which hits our planet every day.

This extraordinary stability of DNA under space conditions also needs to be factored into the interpretion of results in the search for extraterrestrial life: “The results show that it is by no means unlikely that, despite all the safety precautions, space ships could also carry terrestrial DNA to their landing site. We need to have this under control in the search for extraterrestrial life,” points out Ullrich.

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4 thoughts on “Now On the Origin-of-Life Menu: An alternative to PRIMORDIAL SOUP”

  1. “until they can describe the basic SOUP to begin with.”

    A good basic soup starts with a medium onion and chop in a few basic vegetables to give a rounded flavour. A combination of one carrot, one stick of celery and one leek works well. Sweat these off with a knob of butter: that means heating the butter, dropping in the chopped vegetables, stirring to coat and putting the lid back on. Cook, with the occasional stir for 15 – 20 minutes to soften them
    (:-))

  2. Look, I understand that failure to demonstrate an appropriate primordial soup on earth to account for the independent rising of DNA is a difficult obstacle to overcome, but MOVING the problem (that is, saying life arose somewhere else and was randomly transferred here) does not make said SOUP unnecessary! Moving a problem does not eliminate the problem, until they can describe the basic SOUP to begin with.

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