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Related Experiment Videos

Evolution of glucagon genes.

L C Lopez1, W H Li, M L Frazier

  • 1Department of Biochemistry and Molecular Biology, University of Texas System Cancer Center, M.D. Anderson Hospital and Tumor Institute, Houston 77030.

Molecular Biology and Evolution
|July 1, 1984
PubMed
Summary

Gene duplication events in preproglucagon genes occurred over a billion years ago. Analyses reveal conserved glucagon-like peptides I and II (GLP-I, GLP-II) suggest vital physiological roles.

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Area of Science:

  • Evolutionary genomics
  • Molecular evolution
  • Comparative genomics

Background:

  • The preproglucagon gene encodes peptides involved in glucose homeostasis.
  • Understanding the evolutionary history of this gene provides insights into peptide function.
  • Comparative analysis across species reveals conserved and divergent evolutionary paths.

Purpose of the Study:

  • To investigate the evolutionary timeline of preproglucagon gene duplications.
  • To estimate rates of molecular evolution in different regions of the preproglucagon gene.
  • To infer the functional significance of conserved peptide regions.

Main Methods:

  • Statistical analyses of DNA sequences from bovine, human, hamster, and anglerfish preproglucagon genes.
  • Phylogenetic analysis to determine gene duplication events and their timing.

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  • Calculation of synonymous and nonsynonymous substitution rates across gene regions.

    • Main Results:

    • Two distinct gene duplication events were identified: one creating two anglerfish genes (~160 Myr ago) and an internal duplication producing glucagon and glucagon-like peptide II (GLP-II) regions (~1.2 billion years ago).
    • Glucagon-like peptide I (GLP-I) arose from a duplication of the ancestral glucagon region (~800 Myr ago).
    • High conservation was observed in GLP-I and GLP-II regions, with low nonsynonymous substitution rates, suggesting significant physiological importance. The GRPP region showed moderate conservation in mammals.

    Conclusions:

    • The preproglucagon gene has undergone ancient duplication events, shaping its current structure in fish and mammals.
    • The high conservation of GLP-I and GLP-II regions indicates crucial, conserved physiological functions.
    • The evolutionary rates suggest selective pressures maintaining the integrity of these important signaling peptides.