Cloning and characterization of canine thyroglobulin complementary DNA

Area of Science:

• Veterinary Medicine
• Molecular Biology
• Immunology

Background:

• Canine thyroglobulin (cTg) is implicated as a key autoantigen in canine autoimmune thyroiditis, a common cause of hypothyroidism in dogs.
• Understanding the molecular structure of cTg is essential for elucidating the mechanisms underlying this autoimmune disease.

Purpose of the Study:

• To clone and sequence the complete complementary DNA (cDNA) of canine thyroglobulin (cTg).
• To identify canine-specific regions within the cTg sequence.
• To provide foundational data for future research into cTg-associated autoimmune thyroiditis in dogs.

Main Methods:

• Reverse transcriptase polymerase chain reaction (RT-PCR) was employed to amplify and clone the cTg cDNA.
• The full-length cTg cDNA sequence was determined through nucleotide sequencing.

Main Results:

• The complete cDNA sequence of cTg was successfully obtained, revealing an open reading frame of 8289 nucleotides.
• The encoded polypeptide consists of 2762 amino acids.
• The canine cTg sequence exhibits 78.9% and 78.1% identity to bovine and human thyroglobulin, respectively.

Conclusions:

• The determined complete cTg sequence provides valuable insights into its primary structure.
• This sequence data is instrumental for future investigations into antigenic epitopes involved in canine autoimmune thyroiditis.
• The findings contribute to understanding the pathogenesis of cTg-associated thyroid diseases in dogs.