Changing nucleosome positions in vivo through modification of the DNA rotational information

The effects of the rotational information of DNA in determining the in v i v o localization of nucleosomal core particles (ncps) have been studied in the Saccharomyces cere v isiae 5 S rRNA repeat gene. The distribution of the phased series of flexibility signals present in this DNA has been altered by inserting in its centre a 25 bp tract. The effects of such alteration on the in v i v o distribution of the helically phased, alternatively located ncps have been determined relative to a reference 21 bp insertion mutant. The results show that the answers provided in v itro and in v i v o by the yeast 5 S rRNA gene sequence to specific modifications of the DNA rotational frame are similar, thus pointing to the relevance of DNA rotational information in v i v o .