Expression profiles for genes in the turkey major histocompatibility complex B-locus

Area of Science:

• Genomics
• Immunology
• Avian Biology

Background:

• The Major Histocompatibility Complex (MHC) is crucial for immune responses and animal health, with galliforms having distinct MHC-B and MHC-Y regions.
• The turkey MHC-B region contains numerous predicted genes, but their expression and function remain largely unconfirmed.

Purpose of the Study:

• To investigate the expression patterns of MHC-B genes in various domestic turkey tissues.
• To provide the first locus-wide analysis of MHC-B gene expression in any avian species.

Main Methods:

• Reverse-transcription PCR was used to detect MHC-B gene transcripts across a panel of immune and nonimmune tissues.
• Sequencing was performed to identify previously undescribed splice variants.

Main Results:

• Expression of all 40 predicted MHC-B genes was confirmed, including B-butyrophilin 2 (BTN2), a gene with no prior evidence of expression.
• Most MHC-B genes exhibited broad expression across different tissues.
• Novel splice variants were identified in three genes.

Conclusions:

• This study confirms the expression of all predicted MHC-B genes in turkeys, offering a comprehensive expression profile.
• Understanding these expression patterns aids in elucidating gene functions and coregulation within the avian MHC.
• The findings establish a valuable resource for future research on turkey immunology and disease resistance.