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Related Concept Videos

From DNA to Protein03:06

From DNA to Protein

The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
The Central Dogma01:25

The Central Dogma

Overview
The Central Dogma01:20

The Central Dogma

The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
The Central Dogma01:20

The Central Dogma

The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
The Central Dogma01:25

The Central Dogma

Overview
Gene Evolution - Fast or Slow?02:05

Gene 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...

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Related Experiment Video

Updated: Jul 7, 2026

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli
11:08

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

Published on: December 9, 2017

A scenario on the stepwise evolution of the genetic code.

Jing-Fa Xiao1, Jun Yu

  • 1CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing 100029, China.

Genomics, Proteomics & Bioinformatics
|February 13, 2008
PubMed
Summary

The RNA world

Area of Science:

  • Origin of Life Studies
  • Molecular Evolution
  • Biochemistry

Background:

  • The early RNA world likely utilized limited nucleosides for operational (ribozymes) and informational (riboscripts) RNA.
  • RNA molecules evolved complex functions, including self-modification and editing, leading to amino acid polymerization.

Purpose of the Study:

  • To elucidate the stepwise evolution of the genetic code from a simple system to its current complexity.
  • To understand the co-evolution of RNA, DNA, proteins, and cellular machinery in early life.

Main Methods:

  • This study proposes a model based on existing biochemical and evolutionary theories.
  • It analyzes the proposed functional and informational roles of RNA nucleosides and their modifications.

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Curation of Computational Chemical Libraries Demonstrated with Alpha-Amino Acids
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Curation of Computational Chemical Libraries Demonstrated with Alpha-Amino Acids

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Related Experiment Videos

Last Updated: Jul 7, 2026

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli
11:08

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

Published on: December 9, 2017

Curation of Computational Chemical Libraries Demonstrated with Alpha-Amino Acids
08:21

Curation of Computational Chemical Libraries Demonstrated with Alpha-Amino Acids

Published on: April 13, 2022

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Main Results:

  • The genetic code expanded from seven to 20 amino acids by incorporating new nucleosides and reducing guanine's operational roles.
  • This expansion coincided with the departure of aminoacyl-tRNA synthetases (AARSs), RNA to DNA replacement, and AARS-tRNA co-evolution.

Conclusions:

  • The maturation of the genetic code was a gradual process intertwined with major molecular and cellular transitions.
  • This model predicts a progressive shift from RNA-based to protein-based mechanisms and DNA-based information storage.