Ogre elements represent a distinct group of Ty3/gypsy LTR retrotransposons occurring in a range of dicot plants. They are characterized by two specific features ? presence of long extra open reading frame in 5´ untranslated region with unknown function and a non-coding sequence containing several stop codons separating protease and reverse transcriptase domains which was proposed to be removed by splicing. This thesis describes the functional analysis of intron splicing in Ogre retrotransposons. Further, it investigates additional coding information not only in Ogre retrotransposons but in the whole group of Ty3/gypsy retroelements.