Variation in the ovine PRKAG3 gene.

Area of Science:

• Animal Genetics
• Molecular Biology
• Biochemistry

Background:

• 5'AMP-activated protein kinase (AMPK) regulates cellular energy homeostasis.
• The PRKAG3 gene encodes the AMPK γ3 subunit, and its variations are linked to meat quality in pigs.
• Investigating ovine PRKAG3 variation is essential for understanding its role in sheep.

Purpose of the Study:

• To investigate genetic variations in the ovine PRKAG3 gene, specifically in exon 3 and exons 4-6.
• To identify nucleotide substitutions and potential amino acid changes within the ovine PRKAG3 gene.
• To explore the functional significance of PRKAG3 variations for AMPK activity and meat quality in sheep.

Main Methods:

• Polymerase chain reaction-single stranded conformational polymorphism (PCR-SSCP) was employed.
• Ovine PRKAG3 gene regions (exon 3, exons 4-6) were analyzed in 160 New Zealand Suffolk sheep.
• Nucleotide sequences were identified and compared to known sequences.

Main Results:

• Two variant sequences (a, b) in exon 3 and three (A, B, C) in exons 4-6 of ovine PRKAG3 were identified.
• Three nucleotide substitutions were found: in intron 4, exon 4 (g.2656 C>T), and intron 5.
• A potential R230W amino acid substitution in ovine PRKAG3 was identified, unique to sheep.

Conclusions:

• This study reports novel genetic variations in the ovine PRKAG3 gene for the first time.
• The identified variations, particularly the R230W substitution, may have functional implications for AMPK activity.
• These findings suggest a potential link between ovine PRKAG3 genetic variation and meat quality traits in sheep.