Non-coding DNA: Difference between revisions

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Revision as of 05:26, 12 July 2023

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The remainder of the genome (70% non-coding DNA) consists of [[Promoter (genetics)|promoters]] and regulatory sequences that are shorter than those in other plant species.<ref name = Ibarra-Laclette/> The genes contain introns but there are fewer of them and they are smaller than the introns in other plant genomes.<ref name = Ibarra-Laclette/> There are noncoding genes, including many copies of ribosomal RNA genes.<ref name = Lan/> The genome also contains telomere sequences and centromeres as expected.<ref name = Lan/> Much of the repetitive DNA seen in other eukaryotes has been deleted from the bladderwort genome since that lineage split from those of other plants. About 59% of the bladderwort genome consists of transposon-related sequences but since the genome is so much smaller than other genomes, this represents a considerable reduction in the amount of this DNA.<ref name = Lan/> The authors of the original 2013 article note that claims of additional functional elements in the non-coding DNA of animals do not seem to apply to plant genomes.<ref name = Ibarra-Laclette/>

According to a New York Times piecearticle, during the evolution of this species, "... genetic junk that didn't serve a purpose was expunged, and the necessary stuff was kept."<ref>{{cite news | vauthors = Klein J | title = Genetic Tidying Up Made Humped Bladderworts Into Carnivorous Plants | url = https://www.nytimes.com/2017/05/19/science/humped-bladderwort-carnivorous-plant-genome.html | work = New York Times | date = 19 May 2017 | access-date = May 30, 2022}}</ref> According to Victor Albert of the University of Buffalo, the plant is able to expunge its so-called junk DNA and "have a perfectly good multicellular plant with lots of different cells, organs, tissue types and flowers, and you can do it without the junk. Junk is not needed."<ref>{{ cite press release | vauthors = Hsu C, and Stolte D | date = May 13, 2013 | title = Carnivorous Plant Throws Out 'Junk' DNA | url = https://news.arizona.edu/story/carnivorous-plant-throws-out-junk-dna | ___location = Tucson, AZ, USA | publisher = University of Arizona | access-date = May 29, 2022}}</ref>

==Types of non-coding DNA sequences==