Sina Technology News Beijing time on April 8th news, according to the British "Daily Mail" reported that the results of a new study may completely overthrow our long-standing theory of the origin of cell life. This study shows that RNA and DNA may be the first to be integrated.
In the field of the origin of life, there has long been a theory called "RNA World". According to the theory, RNA molecules with self-replication ability appear earlier than DNA and protein, and become the key stage of the earliest life evolution. In fact, the theory holds that the original cell life is based on RNA.
This theory was first proposed by Alexander Rich in 1962 and supported by a large number of observational clues, becoming a widely accepted theoretical framework in the mainstream scientific community.
But now, this view has met with challenges.
Dr. Ramanarayanan Krishnamurthy, co-first author of the relevant paper at the Scripps Institution of Oceanography in California, said: "This new discovery suggests that our researchers are on Earth. Research on issues related to the origin of life should not be overly dependent on presuppositions of the RNA world."
According to the RNA world theory, RNA molecules act as the initial form of cell life, and then evolve and form DNA molecules under the interaction with enzymes. But in this latest study, scientists have identified a compound called thiouridine. The team believes that this compound can be converted to DNA or RNA by a chemical reaction.
Even the two substances that make up the core of cell life may be combined with each other to construct the earliest genome, which will be separated later. Krishna Mosi said: "We gradually realized that RNA and DNA may have been originally combined, but later separated from each other, each playing its own role."
Although in the second half of the 20th century, the theory of the "RNA world" did get the attention of the world's mainstream scientific community, there has been a fierce debate within the scientific community about the origin of the earliest life on Earth. According to some theories, life originates from simple forms of proteins, which themselves act as enzymes. Since then, DNA and RNA have evolved, and then fat appears, thus preparing for the construction of cell life. Building materials."
Scientists pointed out that ultimately the issue of the origin of life will affect all aspects of the human world, from our understanding of medicine and the human body to chemical and even technology.
Whether this new discovery will eventually overthrow the old framework and replace it with it remains to be seen, but at least, as some scientists have said, putting a full stop on the origin of life is a contempt for it.
As a scientist involved in this research said in the face of the media: "As a scientist, especially a chemist, we should always be excited about the origin of life, because it is like an eternal problem in making machines, Constantly throwing some fundamental questions to us and prompting us to explore, debate and research." (Morning Wind)
Source: Sina Technology
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