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Related Experiment Videos

Complementary DNA sequence of chicken thyroid-stimulating hormone (TSH) beta subunit

Y Kato1, T Kato, K Tomizawa

  • 1Biosignal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan.

Endocrine Journal
|January 9, 1999
PubMed
Summary

Researchers cloned and sequenced the chicken TSH beta subunit cDNA. This thyroid-stimulating hormone subunit shows high conservation in birds but lower homology with mammals, amphibians, and fish.

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Area of Science:

  • Comparative genomics
  • Molecular biology
  • Endocrinology

Background:

  • Thyroid-stimulating hormone (TSH) is crucial for regulating thyroid function.
  • Understanding TSH beta subunit evolution provides insights into vertebrate endocrine systems.

Purpose of the Study:

  • To clone and sequence the chicken TSH beta subunit cDNA.
  • To compare the amino acid sequence of chicken TSH beta subunit with other vertebrates.
  • To analyze the structural characteristics of avian TSH beta subunits.

Main Methods:

  • cDNA cloning and sequencing of chicken TSH beta subunit.
  • Amino acid sequence alignment and homology analysis.
  • Comparative structural analysis of TSH beta subunits across species.

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Main Results:

  • The chicken TSH beta subunit cDNA encodes a signal peptide and a mature protein of 114 amino acids.
  • High sequence conservation (98.5%) was observed between chicken and Japanese quail TSH beta subunits.
  • Lower homology was found with mammals (67-69%), amphibians (58%), and fish (40-49%).

Conclusions:

  • Chicken TSH beta subunit exhibits high conservation within avian species.
  • Significant divergence exists between avian and non-avian vertebrate TSH beta subunits.
  • Structural analysis highlights evolutionary adaptations of TSH beta subunits in birds.