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Latest RNA world hypothesis Stories

2010-01-08 16:09:43

The study was carried out by 3 European researchers, 1 from Universitat Autònoma de Barcelona A research published in Proceedings of National Academy of Sciences rejects the theory that the origin of life stems from a system of self-catalytic molecules capable of experiencing Darwinian evolution without the need of RNA or DNA and their replication. The research, which was carried out with the participation of Mauro Santos, researcher of the Department of Genetics and...

2009-11-20 16:57:31

Appearing in the Nov. 27, 2009, issue (Vol. 284, No. 48) of JBC A key question in the origin of biological molecules like RNA and DNA is how they first came together billions of years ago from simple precursors. Now, in a study appearing in this week's JBC, researchers in Italy have reconstructed one of the earliest evolutionary steps yet: generating long chains of RNA from individual subunits using nothing but warm water. Many researchers believe that RNA was one of the first biological...

2009-10-22 14:27:58

Scientists who study RNA have faced a formidable roadblock: trying to examine RNA's movements in a living cell when they can't see the RNA. Now, a new technology has given scientists the first look ever at RNA in a live bacteria cell"”a sight that could offer new information about how the molecule moves and works. Interest in RNA, which plays a key role in manufacturing proteins, has increased in recent years, due in large part to its potential in new drug therapies. RNA localization...

2009-06-12 08:53:32

A team of Scripps Research scientists has created a new analog to DNA that assembles and disassembles itself without the need for enzymes. Because the new system comprises components that might reasonably be expected in a primordial world, the new chemical system could answer questions about how life could emerge.The work, reported in the June 11, 2009 issue of Science Express, an advance, online publication of the journal Science, might also be a starting point on the way to exotic new...

2009-01-09 15:41:14

Now, a pair of Scripps Research Institute scientists has taken a significant step toward answering that question. The scientists have synthesized for the first time RNA enzymes that can replicate themselves without the help of any proteins or other cellular components, and the process proceeds indefinitely.The work was published on Thursday, January 8, 2008, in Science Express, the advanced, online edition of the journal Science.In the modern world, DNA carries the genetic sequence for...

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2008-12-17 15:57:04

Here's another argument against intelligent design. An evolutionary geneticist from the Universit© de Montr©al, together with researchers from the French cities of Lyon and Montpellier, have published a ground-breaking study that characterizes the common ancestor of all life on earth, LUCA (Last Universal Common Ancestor). Their findings, presented in a recent issue of Nature, show that the 3.8-billion-year-old organism was not the creature usually imagined. The study changes ideas...

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2008-06-14 08:35:00

Scientists have confirmed for the first time that an important component of early genetic material which has been found in meteorite fragments is extraterrestrial in origin. The finding suggests that parts of the raw materials to make the first molecules of DNA and RNA may have come from the stars. The scientists, from Europe and the USA, say that their research, published in the journal Earth and Planetary Science Letters, provides evidence that life's raw materials came from sources beyond...

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2008-01-09 08:10:00

WEST LAFAYETTE, Ind. - The crystal structure of a molecule from a primitive fungus has served as a time machine to show researchers more about the evolution of life from the simple to the complex. By studying the three-dimensional version of the fungus protein bound to an RNA molecule, scientists from Purdue University and the University of Texas at Austin have been able to visualize how life progressed from an early self-replicating molecule that also performed chemical reactions to one in...

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2007-03-20 08:20:00

Researchers at the University of California, Santa Cruz, have determined the three-dimensional structure of an RNA enzyme, or "ribozyme," that carries out a fundamental reaction required to make new RNA molecules. Their results provide insight into what may have been the first self-replicating molecule to arise billions of years ago on the evolutionary path toward the emergence of life. In all forms of life known today, the synthesis of DNA and RNA molecules is carried out by enzymes made of...

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2006-03-16 06:11:40

NASA -- How does chemistry become biology? Solving this question is important for research into life's origins, and also for the search for life elsewhere in the universe. In this interview, Dimitar Sasselov, professor of astronomy at Harvard University, describes a new comprehensive study that will try to figure out how chemical systems cross over into the world of the living. --- Interview with Dimitar Sasselov Astrobiology Magazine (AM): Harvard University is funding a new study called...