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Background A large fraction of vertebrate genomes is composed of endogenous retroviruses (ERVs), which are remnants of ancient retroviral infections. In mammals, five retroviral envelope genes with a placenta-specific expression and a fusogenic activity, the syncytins, have been independently “captured” in primates, rodents and lagomorphs (which are all Euarchotonglires mammals) and conserved over more than 30 million years in a functional state. They are involved in the formation of the syncytiotrophoblast, and are necessary for placental development. Here we searched for syncytins in the Carnivora order that belongs to the Laurasiatheria, which diverged from the Euarchotonglires shortly after mammalian radiation around 100 million years ago.

retrovirology

Identification of syncytin-car-1, an endogenous retroviral envelope gene involved in placentation and conserved in Carnivora: a syncytin in a new superorder of placental mammals