Preliminary report on β-casein gene Met183QVal183 polymorphism in Romanian indigenous Zackel sheep breeds

Abstract

Genetic polymorphisms of the milk protein genes are important because of their effects on quantitative traits and technological properties of milk manufacturing. In the present study we identified the polymorphism of the beta-casein gene in two local sheep breeds (Racka n=98 and Turcana n=111) in Romania. The most studied variants at the ovine beta-casein (CSN2) locus are: A and G variants. Genomic DNA was extracted from hair follicles and beta-casein genotypes were determined by the rapid TaqMan (Applied Biosystems, USA) genotyping assay. Homozygote genotypes GG were not detected in any of the studied breeds. In both, the Racka and Turcana breeds, the A variant had a much higher frequency, 0.98% and 0.97%, respectively. In the current study, the fast DNA tests for genotyping ovine CSN2 were successfully optimized, however, further samples and correlations of genomic results with milk characteristics and production data are needed for the development of future selection schemes of the Romanian indigenous sheep breeds, with the ultimate purpose to produce low allergen level sheep milk and derived dairy products.

Single and combined effects of CSN1S1 and CSN2-casein genes on Awassi sheep milk quantity and quality

“…Chessa et al [10] reported a missense mutation (rs416941267) in the CSN2 that changed C to A protein alleles inCSN2. The molecular characterization and the association between CSN2 polymorphisms with milk performance were studied in sheep [12,15,16]. This is the first study designed to screen the commercial Awassi sheep CSN1S1 and CSN2 genes loci and investigate their single and combined effects on CSN2 genes and their association with milk production and composition.…”