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The multigene family of pregnancy‐associated glycoproteins ( PAG s) belongs to a group of aspartic proteases that are exclusively expressed by trophoblast cells in the placenta of even‐toed ungulates. In  Bovidae , 22 different  PAG  genes (bo PAG s) with a wide range of temporal and spatial expression‐ and glycosylation patterns have been reported to date. In this study we describe the  mRNA  expression patterns using real‐time quantitative  PCR  ( qPCR ) for selected modern (bo PAG ‐1, ‐9, ‐21) and ancient bovine  PAG s (bo PAG ‐2, ‐8, ‐10, ‐11, ‐12) in cotyledonary tissue. The highest mean expression was detected in bo PAG ‐8 and lowest in bo PAG ‐10 ( P  < 0.05). Furthermore, bo PAG ‐8 and ‐11 were significantly greater expressed in early gestation compared with later pregnancy stages. The characterization of bo PAG mRNA ‐expression levels gives important insights for further protein analyses which will be valuable information for the development of new pregnancy detection systems.

veterinary medicine and science

mRNA  expression profiling in cotyledons reveals significant up‐regulation of the two bovine pregnancy‐associated glycoprotein genes bo PAG ‐8 and bo PAG ‐11 in early gestation