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Related Experiment Videos

A marsupial phosphoglycerate kinase (PGK) processed pseudogene.

A van Daal1, D W Cooper, P L Molloy

  • 1School of Biological Sciences, Macquarie University, New South Wales, Australia.

Genomics
|August 1, 1989
PubMed
Summary

Researchers identified a phosphoglycerate kinase (PGK) pseudogene in a hill kangaroo. This marsupial PGK pseudogene shows significant homology to eutherian PGK genes, suggesting ancient origins of pseudogenes in mammals.

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Area of Science:

  • Genomics
  • Comparative genomics
  • Molecular evolution

Background:

  • Phosphoglycerate kinase (PGK) is a crucial enzyme in glycolysis.
  • Pseudogenes are non-functional DNA sequences resembling functional genes.
  • Understanding pseudogene evolution provides insights into genome dynamics.

Purpose of the Study:

  • To isolate and characterize a PGK pseudogene from the hill kangaroo (Macropus robustus).
  • To investigate the evolutionary relationship of marsupial PGK pseudogenes to eutherian PGK genes.
  • To assess the evolutionary age of pseudogenes in the mammalian lineage.

Main Methods:

  • Isolation of a genomic clone using a human PGK cDNA probe from a hill kangaroo lambda EMBL4 library.
  • DNA sequencing of the isolated clone.

Related Experiment Videos

  • Comparative sequence analysis with human and mouse PGK genes.

    • Main Results:

    • A PGK pseudogene was identified in the hill kangaroo.
    • The pseudogene exhibited mutations (deletions, insertion, nonsense mutation) compared to the functional human X-linked PGK gene.
    • Sequence homology indicated a closer relationship to eutherian X-linked PGK genes than to autosomal forms.
    • The 3' untranslated region showed partial homology to the human counterpart.
    • The pseudogene lacked a 3' poly(A) tail and was flanked by terminal repeats.

    Conclusions:

    • The identified hill kangaroo PGK pseudogene is evolutionarily ancient, predating the divergence of marsupials and eutherians.
    • Pseudogenes are likely ancient features in mammalian evolution, possibly originating over 100 million years ago.
    • Comparative analysis of pseudogenes aids in understanding gene family evolution and mammalian diversification.