Related Experiment Video
Updated: Jun 10, 2026
08:55
RNA Interference in Aquatic Beetles as a Powerful Tool for Manipulating Gene Expression at Specific Developmental Time Points
Published on: May 29, 2020
Getting past the RNA world: the initial Darwinian ancestor
1Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado. yarus@colorado.edu
Cold Spring Harbor Perspectives in Biology
|August 20, 2010
Summary
The RNA-world hypothesis sheds light on early life forms from over 4 billion years ago. This understanding helps us infer the characteristics of Earth's first replicators and Darwinian creatures.
Area of Science:
- Origin of Life studies
- Astrobiology
- Biochemistry
Background:
- The RNA-world hypothesis is supported by new evidence.
- Understanding early life is crucial for evolutionary biology.
- The earliest life forms may have been RNA-based.
Purpose of the Study:
- To infer the nature of pre-RNA life.
- To understand the first replicators on Earth.
- To connect early life to modern biological systems.
Main Methods:
- Analysis of RNA-world hypothesis premises.
- Extrapolation of current biological knowledge to early life.
- Comparative analysis of ancient and modern replicators.
Main Results:
- Confirmation of RNA-world hypothesis supports insights into dawn organisms.
- Improved ability to reason about life preceding RNA.
- Identification of RNA congeners as plausible descendants of first replicators.
Conclusions:
- The RNA-world hypothesis provides a framework for studying the origin of life.
- Early life forms, or 'dawn organisms,' followed the origin of life.
- Modern RNA molecules may be descendants of Earth's first replicators.
Related Concept Videos
02:55The Evidence for Evolution
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
02:05Gene Evolution - Fast or Slow?
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
02:05Gene Evolution - Fast or Slow?
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
02:54Evolutionary Relationships through Genome Comparisons
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
01:24Eukaryotic Evolution
The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
01:21Three-Domain System of Life
Ribosomal RNA (rRNA) sequence analysis revealed three distinct groups of cells: eukaryotes, bacteria, and archaea. In 1978, Carl R. Woese proposed the concept of domains, a taxonomic level above kingdoms, to differentiate these groups. He suggested that archaea and bacteria, despite their similar appearance, represent separate domains. Domains differ in rRNA, membrane lipid structure, transfer RNA, and antibiotic sensitivity.In this classification, animals, plants, and fungi belong to the...