Researchers Propose New Way to Explain How Life Began on Earth
December 13, 2012 5:19 PM
By looking at information stored in chemistry, says former NASA fellow, life from non-life can be explained
An outstanding question in the
field of evolutionary biology
and biochemistry is how the complex, fragile biochemicals that made up life
arose and transformed biomaterial
in the early Earth from non-living to the earliest "living" organisms. Some researchers have looked for quasi-alive constructs
like prions or viruses
But a new paper by Paul Davies, an
Arizona State University
Regents' Professor and director of the Beyond Center for Fundamental Concepts in Science, and Sara Walker, a NASA post-doctoral fellow at the Beyond Center,
in the journal
suggests that researchers are approaching the problem in the wrong way.
They suggest that rather looking at the "hardware" (biochemicals), they look at the "software" (chemically encoding information). The authors suggest that the defining line between the living and non-living is the ability to manage encoded information, thus the key question is how this information handling arose.
Could the clue to how life arose lie in how it encodes information?
Comments Prof. Walker, "When we describe biological processes we typically use informational narratives -- cells send out signals, developmental programs are run, coded instructions are read, genomic data are transmitted between generations and so forth. So identifying life's origin in the way information is processed and managed can open up new avenues for research."
"Chemical based approaches have stalled at a very early stage of chemical complexity -- very far from anything we would consider 'alive.' More seriously they suffer from conceptual shortcomings in that they fail to distinguish between chemistry and biology."
"We propose that the transition from non-life to life is unique and definable," Prof. Davies adds, "We suggest that life may be characterized by its distinctive and active use of information, thus providing a roadmap to identify rigorous criteria for the emergence of life. This is in sharp contrast to a century of thought in which the transition to life has been cast as a problem of chemistry, with the goal of identifying a plausible reaction pathway from chemical mixtures to a living entity."
"To a physicist or chemist life seems like 'magic matter. It behaves in extraordinary ways that are unmatched in any other complex physical or chemical system. Such lifelike properties include autonomy, adaptability and goal-oriented behavior -- the ability to harness chemical reactions to enact a pre-programmed agenda, rather than being a slave to those reactions."
"We believe the transition in the informational architecture of chemical networks is akin to a phase transition in physics, and we place special emphasis on the top-down information flow in which the system as a whole gains causal purchase over its components. This approach will reveal how the logical organization of biological replicators differs crucially from trivial replication associated with crystals (non-life). By addressing the causal role of information directly, many of the baffling qualities of life are explained."
Crystals are also self-replicating, but they lack the flexibility of life.
[Image Source: Giovanni Dall'Orto]
If that all sounds a bit abstract, it is.
But basically it seems that the pair are arguing that by looking at differences between the self-replicating information in biochemicals (e.g. RNA) verus self-replication information in inorganic/non-living constructs (e.g. crystals), researchers may be able to retrace the process of how life arose on Earth more easily than if they merely focus on painstakingly mixing chemical constituents, hoping something arises.
Interface [via Arvix]
Arizona State Univ.
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