[Study of the novel tissue-specific RNA polymerase II transcription factor].

It has been established that retrogenes lose introns and regulatory regions. Most of them become pseudogenes, but some acquire tissue-specific functions. In this study, a contrary situation is described, when a retrogene from Drosophila melanogaster performs the main functions and is expressed in all tissues, while the initial gene is active only in a small part of the male germ cells. It is suggested that this phenomenon resulted from retroposition of the initial precursor gene in the transcription-suitable region of the genome.