Editing Non-coding DNA (section)

{{Short description|DNA that does not code for proteins}}

'''Non-coding DNA''' ('''ncDNA''') sequences are components of an organism's [[DNA]] that do not [[genetic code|encode]] [[protein]] sequences. Some non-coding DNA is [[Transcription (genetics)|transcribed]] into functional [[non-coding RNA]] molecules (e.g. [[transfer RNA]], [[microRNA]], [[Piwi-interacting RNA|piRNA]], [[ribosomal RNA]], and [[RNA interference|regulatory RNAs]]). Other functional regions of the non-coding DNA fraction include [[regulatory sequence]]s that control [[gene expression]]; [[scaffold attachment region]]s; [[origin of replication|origins of DNA replication]]; [[centromere]]s; and [[telomere]]s. Some non-coding regions appear to be mostly nonfunctional, such as [[introns]], [[pseudogenes]], [[intergenic DNA]], and fragments of [[transposons]] and [[viruses]]. Regions that are completely nonfunctional are called [[junk DNA]].