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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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Mutations01:39

Mutations

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Electrophoretic Analysis of Replication Through Structure-Prone DNA Repeats Within the SV40-Based Human Episome
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Electrophoretic Analysis of Replication Through Structure-Prone DNA Repeats Within the SV40-Based Human Episome

Published on: September 13, 2024

Single amino acid and trinucleotide repeats: function and evolution.

Noel Faux1

  • 1Mental Health Research Institute, The University of Melbourne, Parkville, Victoria, Australia. nfaux@unimelb.edu.au

Advances in Experimental Medicine and Biology
|April 6, 2013
PubMed
Summary
This summary is machine-generated.

Single amino acid repeat expansions cause diseases like Huntington's. However, these repeats also play vital roles in normal protein function and evolution.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • Single amino acid repeat expansions are linked to specific diseases, such as Huntington's disease caused by glutamine repeat expansion in huntingtin.
  • Trinucleotide repeat expansions encoding polyglutamine or polyalanine tracts are responsible for various disorders.
  • The age of onset for polyglutamine-induced neurodegenerative diseases often correlates negatively with the length of the expanded repeat.

Purpose of the Study:

  • To explore the prevalence and function of single amino acid repeats.
  • To investigate the potential role of single amino acid repeats in evolution and biological processes.
  • To examine how changes in repeat length might be evolutionarily advantageous.

Main Methods:

  • Literature review of studies on amino acid repeat expansions.
  • Analysis of genetic data related to repeat length and disease.
  • Examination of evolutionary patterns associated with repeat variations.

Main Results:

  • Single amino acid repeats are implicated in both disease pathogenesis and normal protein function.
  • Changes in repeat length can have significant biological consequences.
  • Evidence suggests a role for repeat length variation in evolutionary adaptation.

Conclusions:

  • Single amino acid repeats are crucial elements in protein structure and function.
  • While expansions can cause disease, variations in repeat length may confer evolutionary benefits.
  • Further research is needed to fully understand the multifaceted roles of these repeats.