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{{Short description|DNA not coding for protein}}
{{split | Non-coding DNA | Junk DNA | date=March 4 2023}}
'''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]].
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