Dictyostelium rDNA consists of non-chromosomal palindromic dimers containing 5S and 36S coding regions.
Restriction enzyme mapping of snap-back DNA has been used to show that the ribosomal DNA (rRNA genes and spacers) from Dictyostelium discoideum exists as 88 kb (kb=1,000 base pairs) linear palindromic dimers. Analysis of the mobility of total cell DNA in 0.15% agarose gels indicates that the majority of the rDNA is not covalently attached to chromosomal DNA.
D004023:Dictyostelium / Q000235:genetics*; D004587:Electrophoresis, Agar Gel; D005111:Extrachromosomal Inheritance; D012335:RNA, Ribosomal / Q000235:genetics*
D012335:RNA, Ribosomal