The isolation and sequence of sheep interleukin 4

Area of Science:

• Immunology
• Molecular Biology
• Comparative Genomics

Background:

• Interleukin-4 (IL-4) is a critical cytokine involved in immune responses.
• Understanding species-specific IL-4 sequences is essential for comparative immunology.

Purpose of the Study:

• To isolate and sequence the complementary DNA (cDNA) for sheep Interleukin-4 (IL-4).
• To compare the sheep IL-4 sequence with homologous sequences from other species.

Main Methods:

• Polymerase Chain Reaction (PCR) was used for cDNA synthesis.
• Oligonucleotides were designed based on conserved regions of known IL-4 cDNA sequences.
• Nucleotide and amino acid sequences were analyzed and compared.

Main Results:

• The nucleotide sequence of sheep IL-4 cDNA was determined.
• Sheep IL-4 cDNA shared 73% homology with human and 62% with mouse cDNA.
• Amino acid comparisons showed 50% homology with human IL-4 and 33% with mouse IL-4.

Conclusions:

• The study presents the first nucleotide and amino acid sequences for sheep IL-4.
• Comparative analysis highlights conserved and divergent regions of IL-4 across mammals.
• This data contributes to understanding the evolution of immune signaling molecules.