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New descubriemientos on the origin of terrestrial life

One of the fields of chemistry and biology that has captured the most attention in recent decades is the origin of life on Earth. Today there are various theories that explain the formation of the first biological compounds and as they then were held to give way to the first cell. Although the famous experiment of synthesis of biomolecules from Stanley Miller and Harold Urey in 1953 partially confirmed the theory of Oparin, today, still lacking sufficient information to explain how these molecules (RNA, DNA, proteins, sugars), the precursors to life gave way to the first body. In this context, British scientists have recently found new evidence on the possible formation of RNA on the primitive earth. Below you can read the note that talks in this regard:

Found in RNA new clues about the origin of life on Earth
AFP, Paris, http://www.elmundo.es

Science continues in its attempt to respond the mysteries of the origins of life on Earth. This time, a group of chemicals believed to have found new clues about the emergence of the first molecules as stores genetic information. Their findings are published in the British journal Nature .

In mammals, fish or bacteria, genetic information is stored in the DNA (deoxyribonucleic acid). For its part, the RNA (ribonucleic acid) plays an active role in translating this information and allow synthesis of active molecules in the body .

However, sometimes one's own genetic information is stored in the form of RNA. This is the case of the virus. RNA being more robust than DNA, scientists have formulated the hypothesis that "RNA world" preceded the current, which dominates DNA life forms. Like its cousin DNA, RNA combines three types of molecules: a sugar, a phosphate and a base that conveys genetic information.

The most widespread among the scientific community states that these three types of molecules due to appear separately on Earth promigenia . But what the chemists have come to understand is how these molecules could associate together to form RNA.

Through chemical synthesis laboratory, John Sutherland, University of Manchester (UK) and colleagues have found a possible clue as to how RNA could occur without the help of enzymes Thanks to the UV and phosphate. The researchers used molecules present on early Earth and causing chemical reactions in models of geological environments such as those that existed in ancient times.

In the same journal, a second study highlights how the RNA, a traditional source of interest to explain the origin of life, is sought by scientists in the deep ocean . The team of Edward DeLong, MIT (USA), has described as different and "small" RNA directly from the plankton.