The ribosomal DNA (abbreviated rDNA) consists of a group of ribosomal RNA encoding genes and related regulatory elements, and is widespread in similar configuration in all domains of life. The ribosomal DNA encodes the non-coding ribosomal RNA, integral structural elements in the assembly of ribosomes, it's importance making it the most abundant section of RNA found in cells of eukaryotes.[1] Additionally, these segments includes regulatory sections, such as an promotor specific to the RNA polymerase I, as well as both transcribed and non-transcribed spacer segments.
Due to their high importance in the assembly of ribosomes for protein biosynthesis, the rDNA genes are generally highly conserved in molecular evolution. The number of copies can vary considerably per species.[1] Ribosomal DNA is widely used for phylogenetic studies.[2][3]
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