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Related Experiment Videos

Evolutionary divergence of thyrotropin receptor structure.

Bjarne Knudsen1, Nadir R Farid

  • 1Bioinformatics Research Center, University of Aarhus, 8000 Aarhus C, Denmark.

Molecular Genetics and Metabolism
|April 3, 2004
PubMed
Summary

Evolutionary analysis of thyrotropin receptor (TSHR) sequences reveals significant rate shifts in key functional sites, particularly in mammals compared to fish. These findings enhance understanding of TSHR evolution and function.

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Area of Science:

  • Evolutionary biology
  • Molecular biology
  • Biochemistry

Background:

  • The thyrotropin receptor (TSHR) plays a crucial role in thyroid hormone regulation.
  • Understanding TSHR evolution can provide insights into its function and potential therapeutic targets.
  • Comparative sequence analysis across species is a powerful tool for identifying functionally important regions.

Purpose of the Study:

  • To investigate evolutionary diversification of residues and domains within the thyrotropin receptor (TSHR).
  • To identify sites exhibiting significant evolutionary rate shifts between mammalian and fish lineages.
  • To correlate identified rate shift sites with known or potential functional regions of the TSHR.

Main Methods:

  • Utilized 18 available TSHR sequences, including primate and fish species.

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  • Employed a likelihood ratio test for evolutionary rate shifts, using LH/CGR sequences as an out-group.
  • Performed statistical tests at each residue to detect rate shifts at the mammalian-fish divergence.

    • Main Results:

    • Identified 82 significant rate shift sites, exceeding statistical expectations (p < 0.0001).
    • Rate shifts were most frequent in the intracellular tail, followed by the ectodomain, and least in the transmembrane region.
    • Discovered 52 mammalian sites with significantly faster evolutionary rates than their fish counterparts, including functionally critical residues and regions near TSHR/G protein coupling sites.

    Conclusions:

    • Evolutionary rate shift analysis has pinpointed key residues and domains in TSHR diversification.
    • Identified sites are crucial for TSHR function, ligand binding, and G protein coupling.
    • Findings provide a basis for targeted mutagenesis studies to elucidate TSHR function and develop novel therapeutic analogues.