Did Life Arise Spontaneously? New Study Clarifies the Answer.

Credit: Noel Clark, University of Colorado

The image shows a droplet of condensed nano-DNA and within it
smaller drops of its liquid crystal phase which show up in polarized
light on the left. The liquid crystal droplets act as 'micro-reactors'.
 
Science offers so many ideas on how we got here, religion offers ideas on who's fault it is, and writers have the job of suggesting why.  Kind of a nice division of labor, don't you think?

If life "spontaneously" appeared on Earth about 4.0 billion years ago, it opens up the possibility and even the probability that self-replicating DNA also appeared on the millions of planets similar to Earth that astronomers say are highly likely to exist.  Ours is a youngish solar system in our 14.5 billion year old universe, and there are billions of universes older and possibly further along the evolutionary ladder, filled with planets in the habitable zone surrounding stars where water, essential at least to life as we know, remains a liquid and doesn't get blown away in the solar wind.

This is, of course, all old news and conjecture.  What is new in this report is an advance in our understanding of how the phenomena of life occurs - apparently it's a natural process.

Here's the report on this interesting finding:
*  *  *  *  *


New study hints at spontaneous
appearance of primordial DNA
The self-organization properties of DNA-like molecular fragments four billion years ago may have guided their own growth into repeating chemical chains long enough to act as a basis for primitive life, says a new study by the University of Colorado Boulder and the University of University of Milan.

While studies of ancient mineral formations contain evidence for the evolution of bacteria from 3.5 to 3.8 billion years ago -- just half a billion years after the stabilization of Earth's crust -- what might have preceded the formation of such unicellular organisms is still a mystery. The new findings suggest a novel scenario for the non-biological origins of nucleic acids, which are the building blocks of living organisms, said CU-Boulder physics Professor Noel Clark, a study co-author.

A paper on the subject led by Tommaso Bellini of the University of Milan was published in a recent issue of Nature Communications. Other CU-Boulder co-authors of the study include Professor David Walba, Research Associate Yougwooo Yi and Research Assistant Gregory P. Smith. The study was funded by the Grant PRIN Program of the Italian Ministries of Education, Universities and Research and by the U.S. National Science Foundation.

The discovery in the 1980's of the ability of RNA to chemically alter its own structure by CU-Boulder Nobel laureate and Distinguished Professor Tom Cech and his research team led to the development of the concept of an "RNA world" in which primordial life was a pool of RNA chains capable of synthesizing other chains from simpler molecules available in the environment. While there now is consensus among origin-of-life researchers that RNA chains are too specialized to have been created as a product of random chemical reactions, the new findings suggest a viable alternative, said Clark.

The new research demonstrates that the spontaneous self-assembly of DNA fragments just a few nanometers in length into ordered liquid crystal phases has the ability to drive the formation of chemical bonds that connect together short DNA chains to form long ones, without the aid of biological mechanisms. Liquid crystals are a form of matter that has properties between those of conventional liquids and those of a solid crystal -- a liquid crystal may flow like a liquid, for example, but its molecules may be oriented more like a crystal.

History of Life
Five Star Reviews
by Richard Cowen

Click on image to order
"Our observations are suggestive of what may have happened on the early Earth when the first DNA-like molecular fragments appeared," said Clark.

For several years the research group has been exploring the hypothesis that the way in which DNA emerged in the early Earth lies in its structural properties and its ability to self-organize. In the pre-RNA world, the spontaneous self-assembly of fragments of nucleic acids (DNA and RNA) may have acted as a template for their chemical joining into polymers, which are substances composed of a large number of repeating units.

"The new findings show that in the presence of appropriate chemical conditions, the spontaneous self assembly of small DNA fragments into stacks of short duplexes greatly favors their binding into longer polymers, thereby providing a pre-RNA route to the RNA world," said Clark.

Related stories:
Also of interest:
 
*  *  *  *  *
Story Source: Materials provided by University of Colorado at Boulder.  Tommaso P. Fraccia, Gregory P. Smith, Giuliano Zanchetta, Elvezia Paraboschi, Yougwooo Yi, David M. Walba, Giorgio Dieci, Noel A. Clark, Tommaso Bellini. Abiotic ligation of DNA oligomers templated by their liquid crystal ordering. Nature Communications, 2015

 

Comments

Post a Comment

Popular posts from this blog

Workout supplements: An emerging eating disorder in men?

Image
therewontbeanydoves.wordpress.com When developing a fictional character, you may not think about the character using large amounts of over-the-counter dietary supplements.  Especially a man who uses large amounts of workout supplements. While there has been widespread publicity on the dangers of the non-prescribed use of anabolic steroids, not much is said about legal, over-the-counter supplements.  Are there risks?  And if so, what are they?  There are several things the writer should consider. Supplement use is becoming an eating disorder with many men who use them to prepare for and recover from a workout. There is growing evidence of a link between muscle-building supplements and testicular cancer. There is evidence that over-the counter medications and supplements are the most common causes of drug-induced liver failure (a rare event, but still a risk.)  There is even evidence that, “certain popular herbal and dietary supplements can also ...
Read more

Remember faces but not names? You got it wrong.

Image
Source:   Daily Excelsior So, you think you're good at remembering faces, but terrible with names? New research has revealed we are actually better at remembering names than faces The cringe-worthy experience of not being able to remember an acquaintance's name leads many of us to believe we are terrible with names. However, new research has revealed this intuition is misleading; we are actually better at remembering names than faces. With the Christmas party season fast approaching, there will be plenty of opportunity to re-live the familiar, and excruciatingly-awkward, social situation of not being able to remember an acquaintance's name. This cringe-worthy experience leads many of us to believe we are terrible at remembering names. However, new research has revealed this intuition is misleading; we are actually better at remembering names than faces. The authors of the study, from the University of York, suggest that when we castigate ourselves f...
Read more

Children's drawings during abuse investigations

Image
Source:  rutherfordcountytn.gov I llustrations by children can be a critical tool in forensic investigations of child abuse. A recent study compared the results when child abuse victims were offered the opportunity to draw during questioning with results when victims were not offered this opportunity. "The act of drawing was not only an empowering experience for these children," said Dr. Katz. "We also found it to be forensically more effective in eliciting richer testimonies in child abuse cases. We had no idea the gap would be so great between those who drew and those who weren't given this option." A chance to express themselves Some 125 alleged child victims of sexual abuse were randomly selected for the field study. The children, aged 5-14, were questioned by nine well-trained forensic interviewers about a single occurrence of alleged sexual abuse. The children were divided into two sets -- a control group, questioned and allowed to rest during t...
Read more

M.I.T. Research Explains How Will Rogers Observation Works

Image
Finally it appears that MIT has gotten involved in proving Will's syllogism, "There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." Read his statement carefully.   ONE learns by reading.   A FEW who learn by observation. Then there's the rest of us. The reason for this, it turns out, is a special circuit in the brain that you or I need to have a functioning version of to actually learn by observing others.  Based on how we all behave, it is a circuit most of us must be missing.   Or perhaps it shorted out the first time we peed on an electric fence and it has yet to grow back.   *  *  *  *  * Brain circuit helps us learn by watching others Scientists pinpoint neural interactions that are necessary for observational learning Researchers have identified a brain circuit requir...
Read more

Unhappy in a relationship? Why do you stay?

Image
Source:   Power of Positivity A story that may effect the development of your romantic comedies.  Why do people stay in unhappy relationships?  Simply put, it's concern for the partner of the unhappy person. This research doesn't offer solutions to this situation, but does help our understanding of why people behave the way they do. NOTE:  Within five minutes this post had 16 hits, the fastest hit rate of any story I've posted.  Might say something of how people feel. Here's the story: *  *  *  *  * When you are unhappy in a relationship, why do you stay?  The answer may surprise you. Study that finds it's not just the investment of time, resources and emotion Why do people stay in unsatisfying romantic relationships? A new study suggests it may be because they view leaving as bad for their partner. The study, being published in the November 2018 issue of the Journal of Personality and Social Psychology, e...
Read more