Characterization of the bovine PRKAG3 gene: structure, polymorphism, and alternative transcripts

Area of Science:

• Animal Genetics
• Biochemistry
• Livestock Science

Background:

• The AMP-activated protein kinase (AMPK) pathway is crucial for energy metabolism regulation.
• The gamma3 subunit (PRKAG3) of AMPK is particularly important in skeletal muscle glycogen metabolism.
• Muscle glycogen levels significantly influence meat quality traits in livestock.

Purpose of the Study:

• To characterize the bovine PRKAG3 gene.
• To analyze genetic polymorphisms within the PRKAG3 gene across three cattle breeds.
• To investigate the potential impact of these polymorphisms on AMPK activity and meat quality.

Main Methods:

• Gene sequencing and characterization of the bovine PRKAG3 gene.
• Single Nucleotide Polymorphism (SNP) discovery and genotyping.
• Analysis of allelic frequencies in different cattle breeds.
• Identification of alternative splicing events.

Main Results:

• Thirty-two SNPs were identified in the bovine PRKAG3 gene, with 13 in coding regions and 5 altering amino acid sequences.
• Mutant alleles affecting the coding sequence were found at very low frequencies across the studied breeds.
• Alternative splicing sites were detected, leading to protein sequence heterogeneity.
• No significant correlation was established between identified SNPs and meat quality due to low mutant allele frequency.

Conclusions:

• The bovine PRKAG3 gene exhibits genetic variations, including SNPs and alternative splicing.
• The low frequency of functionally significant mutations suggests limited impact on meat quality via this gene in the studied populations.
• Further research may explore regulatory elements or other genes influencing PRKAG3 function and meat quality.