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Microbial Communities in Nature and Laboratory - Interview

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Life as a cosmic imperative?

Christian de Duve¹

¹de Duve Institute, 75, Avenue Hippocrate, B-1200 Brussels, Belgium. deduve_private@icp.ucl.ac.be

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|January 12, 2011

Summary

The origin of life likely involved chemistry and replication, suggesting life may be common. If similar conditions exist elsewhere, extraterrestrial life could arise on other planets.

Area of Science:

Astrobiology
Origin of Life Studies
Biochemistry

Background:

Life's origin is a complex process involving chemical reactions and molecular replication.
The transition from non-living matter to life likely occurred in stages, with RNA possibly playing a key role.

Purpose of the Study:

To explore the chemical and selective processes involved in the origin of life.
To assess the likelihood of life arising under specific early Earth conditions.
To evaluate the potential for extraterrestrial life on planets with similar conditions.

Main Methods:

Analysis of chemical pathways leading to self-replicating molecules.
Examination of the role of selection in the early stages of life's evolution.
Comparative assessment of early Earth conditions with those of extrasolar planets.

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Main Results:

The origin of life is proposed to have two stages: purely chemical and then chemical with selection.
Replication accidents and selection were crucial for the second stage of life's origin.
The conditions for life's emergence may be common under suitable planetary environments.

Conclusions:

The origin of life may be a probable outcome of specific physicochemical conditions.
Extrasolar planets replicating Earth's early conditions are probable sites for extraterrestrial life.