The present study was undertaken to analyse the genetic variation in coding sequences, splicing sites and regulatory sequences of FABP4, PPARγ and SCD genes in five breeds of sheep raised in Poland with different purposes: meat (Suffolk, Ile de France), dairy/prolific (Olkuska sheep, Kołuda) and primitive breeds (Polish Mountain Sheep). To identify genetic variability HRM-PCR, sequencing and PCR-RFLP method were used. Determining the genetic structure of the mentioned genes revealed six SNPs: FABP4 – c.73 + 13A>T and c.348 + 85G>A, PPARγ – c.391 – 66C>T (c.481 – 66C>T) and c.529 + 27G>C (c.619 + 27G>C), SCD – c.*945G>A and c.*1116A>G. For the c.*1116A>G SNP, a potential association with specific sheep body type and breeding purpose was found. In turn, the substitution c.*945G>A located in the regulatory region of the 3'-UTR of the Ovis aries SCD gene was identified for the first time. Based on the relationship demonstrated between sheep body constitution and productive type (dairy, meat) and the polymorphism of the SCD gene, further research is needed. The correlation between c.*1116A>G polymorphism and growth rate, slaughter and carcass value as well as meat quality of lambs needs to be studied in more detail. Such studies may lead to more effective selection processes in sheep breeding in the future.
