RNA5-8SN5, Official Symbol RNA5-8SN5provided by HGNC Official Full Name RNA, 5.8S ribosomal N5provided by HGNC Primary source HGNC:HGNC:53533 Gene type rRNA RefSeq status VALIDATED Organism Homo sapiens Lineage Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo Also known as RN5-8S1; RNA5-8S5 Summary 45S ribosomal DNA (rDNA) arrays, or clusters, are present on human chromosomes 13, 14, 15, 21 and 22, designated RNR1 through RNR5, respectively. Each cluster consists of multiple 45S rDNA repeat units that vary in number among individuals and chromosomes, with total diploid copy number estimates ranging from 60 to >800 repeat units in a human genome. The 45S rDNA repeat unit encodes a 45S rRNA precursor, transcribed by RNA polymerase I, which is processed to form the 18S, 5.8S and 28S rRNAs. This gene is a representative copy of the 5.8S ribosomal RNA whose chromosomal location is unknown. [provided by RefSeq, Mar 2017]