junk dna
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Noncoding DNA
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In genetics,noncoding DNA describes components of an organism's DNA sequencesthat do not encode forprotein sequences. In many eukaryotes, a large percentage of an
organism's total genome size is noncoding DNA, although the amount of noncoding
DNA, and the proportion of coding versus noncoding DNA varies greatly between
species.
Much of this DNA has no known biological function and is sometimes referred to as
"junk DNA". However, many types of noncoding DNA sequences do have known
biological functions, including the transcriptional and translationalregulationof protein-
coding sequences. Other noncoding sequences have likely but as-yet undeterminedfunction, an inference from high levels ofhomologyandconservation seen in sequences
that do not encode proteins but appear to be under heavy selective pressure.
Contents
[hide]
1 Fraction of noncoding genomic DNA 2 Junk DNA
3 Types of noncoding DNA sequences
o 3.1 Noncoding functional RNA
o 3.2 Cis-regulatory elements
o 3.3 Introns
o 3.4 Pseudogenes
o 3.5 Repeat sequences, transposons and viral elements
o 3.6 Telomeres
4 Functions of noncoding DNA
5 Noncoding DNA and evolution
6 See also
7 References
8 External links
[edit] Fraction of noncoding genomic DNA
The amount of total genomic DNA varies widely between organisms, and the proportion
of coding and noncoding DNA within these genomes varies greatly as well. More than
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98% of the human genomedoes not encode protein sequences, including most sequences
within introns and most intergenic DNA.[1]
While overall genome size, and by extension the amount of noncoding DNA, arecorrelated to organism complexity, there are many exceptions. For example, the genome
of the unicellularPolychaos dubium (formerly known asAmoeba dubia) has beenreported to contain more than 200 times the amount of DNA in humans.[2] ThepufferfishTakifugu rubripes genome is only about one eighth the size of the human genome, yetseems to have a comparable number of genes; approximately 90% of the Takifugu
genome is noncoding DNA.[1] Most of the difference appears to lie in the junk DNA. The
extensive variation in nuclear genome size among eukaryotic species is known as theC-value enigmaor C-value paradox.[3]
About 80% of the nucleotide bases in the human genome may be transcribed,[4] but
transcription does not necessarily imply function.[5]
[edit] Junk DNA
Junk DNA, a term that was introduced in 1972 by Susumu Ohno,[6] is a provisional label
for the portions of a genomesequence of a for which no discerniblefunction has been
identified. According to a 1980 review inNature by Leslie Orgeland Francis Crick, junk
DNA has "little specificity and conveys little or no selective advantage to the organism".[7] The term is currently, however, a somewhat outdated concept, being used mainly in
popular science and in a colloquial way in scientific publications, and may have slowed
research into the biological functions of noncoding DNA.[8] Several lines of evidenceindicate that many "junk DNA" sequences have likely but unidentified functional
activity, and other sequences may have had functions in the past.[9]
Still, a large amount of sequence in these genomes falls under no existing classification
other than "junk". For example, one experiment removed 1% of the mouse genome withno detectable effect on thephenotype.[10]This result suggests that the removed DNA was
largely nonfunctional. In addition, these sequences are enriched for the heterochromatic
histone modification H3K9me3 [11].
[edit] Types of noncoding DNA sequences
[edit] Noncoding functional RNA
Noncoding RNAs are functional RNA molecules that are not translated into protein.
Examples of noncoding RNA include ribosomal RNA, transfer RNA, Piwi-interacting
RNA and microRNA.
MicroRNAs are predicted to control the translational activity of approximately 30% of allprotein-coding genes in mammals and may be vital components in the progression or
http://en.wikipedia.org/wiki/Human_genomehttp://en.wikipedia.org/wiki/Human_genomehttp://en.wikipedia.org/wiki/Intronhttp://en.wikipedia.org/wiki/Intergenic_regionhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Elgar_.26_Vavouri-0http://en.wikipedia.org/wiki/Genome_sizehttp://en.wikipedia.org/wiki/Genome_sizehttp://en.wikipedia.org/wiki/Polychaos_dubiumhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Gregory-1http://en.wikipedia.org/wiki/Pufferfishhttp://en.wikipedia.org/wiki/Takifuguhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Elgar_.26_Vavouri-0http://en.wikipedia.org/wiki/C-value_enigmahttp://en.wikipedia.org/wiki/C-value_enigmahttp://en.wikipedia.org/wiki/C-value_enigmahttp://en.wikipedia.org/wiki/C-value_enigmahttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Wahls-2http://en.wikipedia.org/wiki/Nucleotide_basehttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-DNAStudy-3http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-DNAStudy-3http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-RNApol2study-4http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=2http://en.wikipedia.org/wiki/Susumu_Ohnohttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Ohno-5http://en.wikipedia.org/wiki/Genomehttp://en.wikipedia.org/wiki/Genomehttp://en.wikipedia.org/wiki/Function_(biology)http://en.wikipedia.org/wiki/Function_(biology)http://en.wikipedia.org/wiki/Nature_(journal)http://en.wikipedia.org/wiki/Leslie_Orgelhttp://en.wikipedia.org/wiki/Leslie_Orgelhttp://en.wikipedia.org/wiki/Francis_Crickhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-6http://en.wikipedia.org/wiki/Popular_sciencehttp://en.wikipedia.org/wiki/Colloquialismhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-SA-7http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-SA-7http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-8http://en.wikipedia.org/wiki/Phenotypehttp://en.wikipedia.org/wiki/Phenotypehttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Nobrega-9http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Nobrega-9http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Nobrega-9http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Rosenfeld_2009-10http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=3http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=4http://en.wikipedia.org/wiki/Noncoding_RNAhttp://en.wikipedia.org/wiki/RNAhttp://en.wikipedia.org/wiki/Ribosomal_RNAhttp://en.wikipedia.org/wiki/Transfer_RNAhttp://en.wikipedia.org/wiki/Piwi-interacting_RNAhttp://en.wikipedia.org/wiki/Piwi-interacting_RNAhttp://en.wikipedia.org/wiki/MicroRNAhttp://en.wikipedia.org/wiki/Mammalshttp://en.wikipedia.org/wiki/Human_genomehttp://en.wikipedia.org/wiki/Intronhttp://en.wikipedia.org/wiki/Intergenic_regionhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Elgar_.26_Vavouri-0http://en.wikipedia.org/wiki/Genome_sizehttp://en.wikipedia.org/wiki/Polychaos_dubiumhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Gregory-1http://en.wikipedia.org/wiki/Pufferfishhttp://en.wikipedia.org/wiki/Takifuguhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Elgar_.26_Vavouri-0http://en.wikipedia.org/wiki/C-value_enigmahttp://en.wikipedia.org/wiki/C-value_enigmahttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Wahls-2http://en.wikipedia.org/wiki/Nucleotide_basehttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-DNAStudy-3http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-RNApol2study-4http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=2http://en.wikipedia.org/wiki/Susumu_Ohnohttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Ohno-5http://en.wikipedia.org/wiki/Genomehttp://en.wikipedia.org/wiki/Function_(biology)http://en.wikipedia.org/wiki/Nature_(journal)http://en.wikipedia.org/wiki/Leslie_Orgelhttp://en.wikipedia.org/wiki/Francis_Crickhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-6http://en.wikipedia.org/wiki/Popular_sciencehttp://en.wikipedia.org/wiki/Colloquialismhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-SA-7http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-8http://en.wikipedia.org/wiki/Phenotypehttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Nobrega-9http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Rosenfeld_2009-10http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=3http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=4http://en.wikipedia.org/wiki/Noncoding_RNAhttp://en.wikipedia.org/wiki/RNAhttp://en.wikipedia.org/wiki/Ribosomal_RNAhttp://en.wikipedia.org/wiki/Transfer_RNAhttp://en.wikipedia.org/wiki/Piwi-interacting_RNAhttp://en.wikipedia.org/wiki/Piwi-interacting_RNAhttp://en.wikipedia.org/wiki/MicroRNAhttp://en.wikipedia.org/wiki/Mammals -
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treatment of various diseases including cancer,cardiovascular disease, and the immune
system response to infection.[12]
[edit] Cis-regulatory elements
Cis-regulatory elements are sequences that control the transcription of a gene. Cis-elements may be located in5' or3'untranslated regions or withinintrons. Promotersfacilitate the transcription of a particular gene and are typically upstreamof the coding
region.
Enhancersequences may exert very distant effects on the transcription levels of genes.[13]
[edit] Introns
Introns are non-coding sections of a gene, transcribed toprecursor mRNA, but ultimately
removed by RNA splicing during the processing to mature messenger RNA. Many
introns appear to be mobile genetic elements.[14]
Studies ofgroup I introns from Tetrahymena indicate that some introns appear to be
selfish genetic elements, neutral to the host because they remove themselves from
flanking exons during RNA processing and do not effect an expression bias betweenalleles with and without the intron.[14] Some introns do appear to have significant
biological function, possibly through ribozyme functionality that may regulate tRNA and
rRNA activity as well as protein-coding gene expression, evident in hosts that have
become dependent on such introns over long periods of time; for example, the trnL-intronis found in all green plants and appears to have been vertically inheritedfor several
billions of years, including more than a billion years withinchloroplasts and an additional
23 billion prior in the cyanobacterial ancestors of chloroplasts.[14]
[edit] Pseudogenes
Pseudogenes are DNA sequences, related to known genes, that have lost their protein-coding ability or are otherwise no longerexpressed in the cell. Pseudogenes arise from
retrotransposition or genomic duplication of functional genes, and become "genomic
fossils" that are nonfuctional due tomutations that prevent thetranscription of the gene,such as within the gene promoter region, or fatally alter the translation of the gene, such
as premature stop codons orframeshifts.[15]Pseudogenes that are the of retrotransposition
of an RNA intermediate are known as processed pseudogenes; pseudogenes that arise
from the genomic remains ofduplicated genes or residues of inactivated arenonprocessed pseudogenes.[15]
While Dollo's Law suggests that the loss of function in pseudogenes is likely permanent,
silenced genes may actually retain function for several million years and can be"reactivated" into protein-coding sequences[16] and a substantial number of pseudogenes
are actively transcribed.[15] Because pseudogenes are presumed to evolve without
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ia.org/wiki/Chloroplasthttp://en.wikipedia.org/wiki/Cyanobacteriahttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-intron-13http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=7http://en.wikipedia.org/wiki/Pseudogenehttp://en.wikipedia.org/wiki/Genehttp://en.wikipedia.org/wiki/Gene_expressionhttp://en.wikipedia.org/wiki/Mutationhttp://en.wikipedia.org/wiki/Transcriptionhttp://en.wikipedia.org/wiki/Translation_(biology)http://en.wikipedia.org/wiki/Stop_codonhttp://en.wikipedia.org/wiki/Frameshifthttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-pmid17568002-14http://en.wikipedia.org/wiki/Gene_duplicationhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-pmid17568002-14http://en.wikipedia.org/wiki/Dollo's_Lawhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-15http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-pmid17568002-14 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evolutionary constraint, they can serve as a useful model of the type and frequencies
various spontaneous genetic mutations.[17]
[edit] Repeat sequences, transposons and viral elements
Transposons and retrotransposonsare mobile genetic elements. Retrotransposon repeatedsequences, which include long interspersed nuclear elements (LINEs) and shortinterspersed nuclear elements (SINEs), account for a large proportion of the genomic
sequences in many species. Alu sequences, classified as a short interspersed nuclear
element, are the most abundant mobile elements in the human genome. Some exampleshave been found of SINEs exerting transcriptional control of some protein-encoding
genes.[18][19]
Endogenous retrovirus sequences are the product ofreverse transcription ofretrovirus
genomes into the genomes ofgerm cells. Mutation within these retro-transcribedsequences can inactivate the viral genome.
Approximately 8% of the human genome is made up of endogenous retrovirus sequences,[20], and as much as 25% is recognizably formed of retrotransposons.[21] Genome size
variation in at least two kinds of plants is mostly the result of retrotransposon sequences.[22]
[edit] Telomeres
Telomeres are regions of repetitive DNA at the end of a chromosome, which provideprotection from chromosomal deterioration during DNA replication.
[edit] Functions of noncoding DNA
Many noncoding DNA sequences have very important biological functions.Comparative
genomics reveals that some regions of noncoding DNA are highlyconserved, sometimeson time-scales representing hundreds of millions of years, implying that these noncoding
regions are under strong evolutionary pressure andpositive selection.[23] For example, in
the genomes ofhumans and mice, which diverged from a common ancestor6575million years ago, protein-coding DNA sequences account for only about 20% of
conserved DNA, with the remaining majority of conserved DNA represented in
noncoding regions.[24]Linkage mapping often identifies chromosomal regions associatedwith a disease with no evidence of functional coding variants of genes within the region,
suggesting that disease-causing genetic variants lie in the noncoding DNA.[24]
Some noncoding DNA sequences are genetic "switches" that do not encode proteins, but
do regulate when and where genes are expressed.[25]According to a comparative study ofover 300 prokaryotic and over 30 eukaryotic genomes,[26]eukaryotesappear to require a
minimum amount of non-coding DNA. This minimum amount can be predicted using a
growth model for regulatory genetic networks, implying that it is required for regulatorypurposes. In humans the predicted minimum is about 5% of the total genome.
http://en.wikipedia.org/wiki/Genetic_mutationhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Petrov_.26_Hartl-16http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Petrov_.26_Hartl-16http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=8http://en.wikipedia.org/wiki/Transposonhttp://en.wikipedia.org/wiki/Retrotransposonhttp://en.wikipedia.org/wiki/Retrotransposonhttp://en.wikipedia.org/wiki/Mobile_genetic_elementshttp://en.wikipedia.org/wiki/Repeated_sequence_(DNA)http://en.wikipedia.org/wiki/Repeated_sequence_(DNA)http://en.wikipedia.org/wiki/Retrotransposon#LINEshttp://en.wikipedia.org/wiki/Retrotransposon#SINEshttp://en.wikipedia.org/wiki/Retrotransposon#SINEshttp://en.wikipedia.org/wiki/Alu_sequencehttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-17http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-18http://en.wikipedia.org/wiki/Endogenous_retrovirushttp://en.wikipedia.org/wiki/Reverse_transcriptionhttp://en.wikipedia.org/wiki/Reverse_transcriptionhttp://en.wikipedia.org/wiki/Retrovirushttp://en.wikipedia.org/wiki/Germ_cellhttp://en.wikipedia.org/wiki/Germ_cellhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Blaise-19http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Deininger-20http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Deininger-20http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-21http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=9http://en.wikipedia.org/wiki/Telomerehttp://en.wikipedia.org/wiki/Chromosomehttp://en.wikipedia.org/wiki/DNA_replicationhttp://en.wikipedia.org/wiki/DNA_replicationhttp://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=10http://en.wikipedia.org/wiki/Comparative_genomicshttp://en.wikipedia.org/wiki/Comparative_genomicshttp://en.wikipedia.org/wiki/Comparative_genomicshttp://en.wikipedia.org/wiki/Conserved_sequencehttp://en.wikipedia.org/wiki/Conserved_sequencehttp://en.wikipedia.org/wiki/Conserved_sequencehttp://en.wikipedia.org/wiki/Evolutionhttp://en.wikipedia.org/wiki/Natural_selectionhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Ludwig-22http://en.wikipedia.org/wiki/Humanhttp://en.wikipedia.org/wiki/Micehttp://en.wikipedia.org/wiki/Micehttp://en.wikipedia.org/wiki/Common_ancestorhttp://en.wikipedia.org/wiki/Common_ancestorhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Cobb_et_al-23http://en.wikipedia.org/wiki/Linkage_mappinghttp://en.wikipedia.org/wiki/Linkage_mappinghttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Cobb_et_al-23http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-24http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-24http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-24http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-25http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-25http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-25http://en.wikipedia.org/wiki/Eukaryoteshttp://en.wikipedia.org/wiki/Eukaryoteshttp://en.wikipedia.org/wiki/Genetic_mutationhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Petrov_.26_Hartl-16http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=8http://en.wikipedia.org/wiki/Transposonhttp://en.wikipedia.org/wiki/Retrotransposonhttp://en.wikipedia.org/wiki/Mobile_genetic_elementshttp://en.wikipedia.org/wiki/Repeated_sequence_(DNA)http://en.wikipedia.org/wiki/Repeated_sequence_(DNA)http://en.wikipedia.org/wiki/Retrotransposon#LINEshttp://en.wikipedia.org/wiki/Retrotransposon#SINEshttp://en.wikipedia.org/wiki/Retrotransposon#SINEshttp://en.wikipedia.org/wiki/Alu_sequencehttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-17http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-18http://en.wikipedia.org/wiki/Endogenous_retrovirushttp://en.wikipedia.org/wiki/Reverse_transcriptionhttp://en.wikipedia.org/wiki/Retrovirushttp://en.wikipedia.org/wiki/Germ_cellhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Blaise-19http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Deininger-20http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-21http://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=9http://en.wikipedia.org/wiki/Telomerehttp://en.wikipedia.org/wiki/Chromosomehttp://en.wikipedia.org/wiki/DNA_replicationhttp://en.wikipedia.org/w/index.php?title=Noncoding_DNA&action=edit§ion=10http://en.wikipedia.org/wiki/Comparative_genomicshttp://en.wikipedia.org/wiki/Comparative_genomicshttp://en.wikipedia.org/wiki/Conserved_sequencehttp://en.wikipedia.org/wiki/Evolutionhttp://en.wikipedia.org/wiki/Natural_selectionhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Ludwig-22http://en.wikipedia.org/wiki/Humanhttp://en.wikipedia.org/wiki/Micehttp://en.wikipedia.org/wiki/Common_ancestorhttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Cobb_et_al-23http://en.wikipedia.org/wiki/Linkage_mappinghttp://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-Cobb_et_al-23http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-24http://en.wikipedia.org/wiki/Noncoding_DNA#cite_note-25http://en.wikipedia.org/wiki/Eukaryot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Some specific sequences of noncoding DNA may be features essential to chromosome
structure, centromere function and homolog recognition in meiosis.[27]
Some noncoding DNA sequences determine how much of a particular protein getsgenerated.[28]
Other sequences of noncoding DNA determine where transcription factorsattach.[28]
[edit] Noncoding DNA and evolution
Shared sequences of apparently non-functional DNA are a major line of evidence for
common descent.[29]
Pseudogene sequences appear to accumulate mutations more rapidly than coding
sequences due to a loss of selective pressure.[17] This allows for the creation of mutant
alleles that incorporate new functions that may be favored by natural selection; thus,
pseudogenes can serve as raw material forevolution and can be considered "protogenes".[30]
[edit] See also
Eukaryotic chromosome fine structure
Phylogenetic footprinting
[edit] References
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