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Pseudogenes: are they "junk" or functional DNA?

Evgeniy S Balakirev1, Francisco J Ayala

  • 1Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92697-2525, USA. esbalak@bio.dvgu.ru

Annual Review of Genetics
|November 18, 2003
PubMed
Summary

Pseudogenes, once thought nonfunctional, often have roles in gene regulation and diversity. These sequences can evolve new functions, potentially becoming new genes.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Pseudogenes are DNA sequences derived from functional genes, traditionally considered nonfunctional.
  • The assumption of selective neutrality for all pseudogene mutations is being challenged by emerging evidence.

Purpose of the Study:

  • To review and synthesize the literature on the functional roles of pseudogenes.
  • To discuss the evolutionary implications of pseudogene functionality and their potential to become new genes.

Main Methods:

  • Literature review focusing on Drosophila and other organisms.
  • Analysis of pseudogene characteristics such as evolutionary conservation and nucleotide polymorphism.

Main Results:

  • Pseudogenes exhibit functional roles including gene expression, regulation, and generation of genetic diversity.
  • Pseudogenes show features expected of functional sequences, like evolutionary conservation and specific patterns of nucleotide variation.
  • Pseudogenes can undergo gene conversion or recombination with functional genes.

Conclusions:

  • Pseudogenes are not merely nonfunctional relics; they possess significant biological roles.
  • Pseudogenes can acquire new functions through mutation and be favored by natural selection.
  • Pseudogenes should be recognized as 'potogenes'—sequences with the potential to evolve into new functional genes.

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