leidyi Is a New Group of DD41D Transposons in Mnemiopsis leidyi Genome

Abstract

The IS630/Tc1/mariner superfamily of transposable elements (TE) is one of the most numerous and widespread among DNA transposons. The IS630/Tc1/mariner TE are divided into eight families: IS630, Tc1, mariner, pogo, maT, mosquito, plants, and rosa. The members of the rosa family (DD41D transposons) were allocated to a separate group relatively recently and are currently characterized in detail only in insects. It is known that the rosa family includes the Crmar-like and LTIR subfamilies. In the present work, the DD41D transposons were for the first time described in Mnemiopsis leidyi and Pleurobrachia bachei ctenophores. It was established that the elements of Mnemiopsis represent a new group, previously unknown, which we named leidyi. The members of this subfamily combine the traits inherent to two other subfamilies of DD41D transposons. The rosa elements belonging to the LTIR subfamily and having more extended DDE/D domains were detected in P. bachei.