title: Ty1 extrachromosomal circular copies in Saccharomyces cerevisiae.
abstract: The eukaryotic transposable element Ty1 is present in about 20-30 integrated copies per yeast aploid genome, variably localized in different strains. Here, we report the presence in yeast of circular extrachromosomal molecules homologous to Ty1, 6 kilobases in size (the same as integrated copies) present in about 1 circular copy/250-300 cells. This finding shows another analogy between eukaryotic-transposable elements and the pro-viral integrative form of retroviruses.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D004251:DNA Transposable Elements; D004270:DNA, Circular / Q000302:isolation & purification*; D004271:DNA, Fungal / Q000302:isolation & purification*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism
chemical_list: D004251:DNA Transposable Elements; D004270:DNA, Circular; D004271:DNA, Fungal