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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...
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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

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The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
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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...
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

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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

Evolving genetic code.

Takeshi Ohama1, Yuji Inagaki, Yoshitaka Bessho

  • 1Kochi University of Technology, Department of Environmental System Engineering, Kochi, Japan.

Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
|October 23, 2008
PubMed
Summary
This summary is machine-generated.

The genetic code is not universal, as demonstrated by Mycoplasma capricolum reading a stop codon as tryptophan. This supports the codon capture theory, explaining how genetic code evolution occurs without altering protein sequences.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • The genetic code was long considered universal across all life.
  • Deviations from the universal genetic code have been observed in various organisms and organelles.
  • The discovery of non-universal codon usage challenges fundamental biological assumptions.

Purpose of the Study:

  • To present evidence supporting the codon capture theory.
  • To explain the evolutionary mechanisms behind genetic code variations.
  • To discuss the historical progression of the genetic code.

Main Methods:

  • Review of existing literature on genetic code deviations.
  • Analysis of Mycoplasma capricolum's deviant genetic code.
  • Examination of supporting evidence for the codon capture theory.

Main Results:

  • Mycoplasma capricolum utilizes UGA, a universal stop codon, to encode tryptophan.
  • Numerous other organisms and mitochondria exhibit non-universal genetic codes.
  • The codon capture theory provides a framework for understanding these variations.

Conclusions:

  • The genetic code is not universal and is actively evolving.
  • The codon capture theory explains non-disruptive genetic code changes.
  • Understanding these evolutionary processes is crucial for molecular biology.