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Transmembrane and cytoplasmic domain sequences demonstrate at least two expressed bovine MHC class I loci

S A Ellis1, K A Braem, W I Morrison

  • 1Institute for Animal Health, Compton, Nr Newbury, Berks, UK.

Immunogenetics
|January 1, 1992
PubMed

Insights

Researchers identified four major bovine major histocompatibility complex class I alleles using PCR. They also found an alternatively spliced mRNA variant, leading to a shorter protein in cattle.

Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Veterinary Science

Background:

  • The bovine major histocompatibility complex (MHC) class I genes play a crucial role in immune responses.
  • Understanding the diversity and expression of these genes is vital for cattle breeding and disease resistance.

Purpose of the Study:

  • To characterize the expressed bovine MHC class I alleles.
  • To investigate the presence and nature of alternative mRNA splicing in bovine MHC class I genes.

Main Methods:

  • Polymerase chain reaction (PCR) was employed to amplify cDNA from expressed bovine MHC class I genes.
  • Sequencing of transmembrane and cytoplasmic domains was performed to identify expressed alleles.
  • Analysis of mRNA transcripts was conducted to detect alternative splicing.

Main Results:

  • Data from three animals suggest the existence of four major expressed MHC class I alleles, potentially arising from two or more loci.
  • An alternatively spliced mRNA variant was identified in five animals.
  • This alternative splicing event involves the removal of exon 7, resulting in a predicted truncated MHC class I protein with a 16 amino acid shorter cytoplasmic tail.
  • The alternative splicing was observed for a single MHC class I allele within each individual.

Conclusions:

  • Bovine MHC class I gene expression is complex, involving multiple alleles and loci.
  • Alternative mRNA splicing represents a mechanism for generating protein diversity in bovine MHC class I molecules.
  • The identified alternatively spliced variant may influence immune recognition and signaling pathways in cattle.

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