cleanup date January 2011 In the study of DNAsequence s, one can distinguish two main types of repeated sequence Tandem repeat s Satellite DNA Minisatellite Microsatellite genetics Microsatellite Interspersed repeat s short interspersed nuclear element SINEs S hort I nterspersed N uclear E lements long interspersed nuclear element LINEs L ong I nterspersed N uclear E lements In primates, the majority of LINEs are LINE 1 and the majority of SINEs are Alu sequence Alu s . In prokaryotes, CRISPR are arrays of alternating repeats and spacers. Other types of repeats Note The following are covered in detail in Computing for Comparative Microbial Genomics . ref name Ussery2008 cite book title Computing for Comparative Microbial Genomics Bioinformatics for Microbiologists chapter Word Frequencies, Repeats, and Repeat related Structures in Bacterial Genomes series Computational Biology volume 8 pages 133 144 first1 David W. last1 Ussery first2 Trudy last2 Wassenaar first3 Stefano last3 Borini publisher Springer edition 1 date 2008 12 22 isbn 978 1 84800 254 8 ref Direct repeat s Global direct repeat Local direct simple repeats Local direct repeats Local direct repeats with spacer Inverted repeat s Global inverted repeat Local inverted repeat Inverted repeat with spacer Palindromic repeat Mirror and everted repeats leave blank until filled out Tandem repeats Interspersed repeats Repetitions in several organisms Prokaryotes Eukaryotes Human See also Eukaryotic chromosome fine structure References reflist External links MeshName DNA Repetitious Region Repeated sequence DEFAULTSORT Repeated SequenceDna Category Repetitive DNA sequences genetics stub cs Repetitivn DNA de Repetitive DNA eo Ripetiva DNA fr S quence r p t e it Sequenza ripetuta di DNA ja pt Sequ ncia repetitiva DNA sr zh ... more details
turn. This results in a deepening of the major groove and a shallowing of the minor. Predicting A DNA structure An algorithm for predicting the propensity of a sequence to flip from B DNA to A DNA ...Image A DNA orbit animated small.gif right frame The A DNA structure. A DNA is one of the many possible double helical structures of DNA . A DNA is thought to be one of three biologically active double helical structures along with B DNA B and Z DNA . It is a right handed double helix fairly similar to the more common and well known B DNA form, but with a shorter more compact helical structure. It appears likely that it occurs only in dehydrated samples of DNA, such as those used in crystallographic experiments, and possibly is also assumed by DNA RNA hybrid helices and by regions of double stranded RNA. Structure A DNA is fairly similar to B DNA given that it is a right handed double helix with major ... cite journal author Basham B, Schroth GP, Ho PS title An A DNA triplet code thermodynamic rules for predicting A and B DNA journal Proc Natl Acad Sci USA volume 92 issue 14 pages 6464 6468 year ... this algorithm blockquote The ability to predict macromolecular conformations from sequence and thermodynamic ... in the hydration of DNA surfaces can be used to distinguish between sequences that form A and B DNA. From this, a triplet code of A DNA propensities was derived as energetic rules for predicting A DNA formation. This code correctly predicted 90 of A and B DNA sequences in crystals and correlates with A DNA formation in solution. Thus, with our previous studies on Z DNA, we now have a single method to predict the relative stability of sequences in the three standard DNA duplex conformations. ref name Basham1995 blockquote Comparison Geometries of the Most Common DNA Forms Image A DNA, B DNA and Z DNA.png right thumb Side view of A , B , and Z DNA. Image B&Z&A DNA formula.jpg thumb right 250px The helix axis of A , B , and Z DNA. class wikitable Geometry attribute A form B form Z form Helix ... more details
author Gregory S title The DNAsequence and biological annotation of human chromosome 1 journal ... ref As a result of this complementarity, all the information in the double stranded sequence of a DNA ... A DNAsequence is called sense if its sequence is the same as that of a messenger RNA copy that is translated ... strands of DNA JCBN NC IUB Newsletter 1989, Accessed 07 May 2008 ref The sequence on the opposite ... organisms. ref name Ghosh The conformation that DNA adopts depends on the hydration level, DNAsequence ... S title Quadruplex DNAsequence, topology and structure journal Nucleic Acids Res volume 34 issue ... from the DNAsequence, as well as chromosomal translocation s. ref cite journal author Valerie K ... in the DNAsequencesequence of pieces of DNA called gene s. Transmission genetics Transmission ..., when a cell uses the information in a gene, the DNAsequence is copied into a complementary RNA sequence through the attraction between the DNA and the correct RNA nucleotides. Usually, this RNA ... 50 of human DNA consisting of non coding repeated sequenceDNA repetitive sequences . ref cite ... A gene is a sequence of DNA that contains genetic information and can influence the phenotype of an organism. Within a gene, the sequence of bases along a DNA strand defines a messenger RNA sequence ... . Here, the two strands are separated and then each strand s complementary DNAsequence is recreated ... can be non specific, or the protein can bind specifically to a single DNAsequence. Enzymes can also bind to DNA and of these, the polymerases that copy the DNA base sequence in transcription and DNA ... June 2, 2012 small yes pp move indef File DNA Structure Key Labelled.pn NoBB.png thumb right 340px The structure of the DNA double helix . The atoms in the structure are colour coded by Chemical element ... thumb The structure of part of a DNA double helix Deoxyribonucleic acid IPAc en audio en us Deoxyribonucleic acid.ogg d i k s i r a b . n ju k l e . k s d DNA is a nucleic ... more details
Other uses In mathematics , a sequence is an ordered list of objects or events . Like a Set mathematics ... possibly infinite is called the length of the sequence. Unlike a set, order matters, and exactly the same elements can appear multiple times at different positions in the sequence. A sequence is a Discrete mathematics discrete function mathematics function . For example, C, R, Y is a sequence of letters ..., or Infinite set infinite , such as the sequence of all even and odd numbers even ... notions of sequence, but may be excluded depending on the context. Image Cauchy sequence illustration2.svg right thumb 350px An infinite sequence of real numbers in blue . This sequence is neither increasing, nor decreasing, nor convergent, nor Cauchy sequence Cauchy . It is, however, bounded ... of which e.g. , exact sequence are not covered by the notations introduced below. In addition to identifying the elements of a sequence by their position, such as the 3rd element , elements may be given names for convenient referencing. For example a sequence might be written as a sub 1 sub , a sub ... definition of a finite sequence with terms in a set S is a function mathematics function from 1, 2, ..., n to S for some n 0. An infinite sequence in S is a function from 1, 2, ... to S . For example, the sequence of prime numbers 2,3,5,7,11, is the function 1 2 , 2 3 , 3 5 , 4 7 , 5 11 , . A sequence of a finite length n is also called an n tuple n tuple . Finite sequences include the empty sequence ... sequence or two way infinite sequence . An example is the bi infinite sequence of all even integers , 4, 2, 0, 2, 4, 6, 8 . Multiplicative Let A a sequence defined by a function f 1, 2, 3, ... 1, 2, 3, ... , such that a sub i sub f i . The sequence is multiplicative if f xy f x f y for all x , y ... of sequences A subsequence of a given sequence is a sequence formed from the given sequence by deleting ... of the sequence are a subset of an partially ordered set ordered set , then a monotonically ... more details
episode episodes 3 episode list Infobox animanga Footer nihongo DNA D N A D En Ei ..., spanning a total of five tank bon volumes. DNA was adapted into a 12 episode anime television ... and animation director for the series was Kumiko Takahashi . DNA has been broadcast in Japan by Animax ... children that carry the Mega Playboy DNA, causing them and all their descendants to each have 100 ... to deal with. Karin reveals to Junta that she is a DNA Operator . Her job is to make alterations in people s DNA that will change their nature for the greater good of society. She intends to shoot the original Mega Playboy with a DCM DNA Control Medicine bullet that will alter his DNA in order ... Playboy DNA stabilizes more and more. nihongo Karin Aoi Aoi Karin anime voices Miina Tominaga Jessica Calvello A sixteen year old DNA Operator from the overcrowded future, sent back in time in order ... DNA. She and Junta spend some time together trying to help cure each other of their problems. She ... Forgotten a Century from Now I ll Never Forget You Manga The DNA manga was published in Japanese ... es ca DNA cs DNA de DNA es DNA fr DNA ko DNA id DNA it DNA ja D N A pt DNA ru DNA fi DNA sv DNA tl DNA zh DNA ... more details
Infobox musical artist See Wikipedia WikiProject Musicians name The Sequence image caption image size Only for images narrower than 220 pixels background group or band alias origin Columbia, South Carolina Columbia , South Carolina , United States U.S. genre Old school hip hop br Funk years active 1979 1985 label Sugar Hill Records rap Sugar Hill associated acts Spoonie Gee website past members Angie Stone Angie Brown Stone Angie B. br Cheryl Cook Cheryl The Pearl br Gwendolyn Chisolm Blondy The Sequence is a former female old school hip hop trio signed to the Sugar Hill Records rap Sugar Hill label in the early 1980s. The group consisted of Cheryl Cook Cheryl The Pearl , Gwendolyn Chisolm Blondie , and lead singer rapper Angie Stone Angie Brown Stone Angie B. . The group originated from Columbia, South Carolina Columbia , South Carolina as a group of high school cheerleader s. Their most notable single was Funk You Up 1979 , which was the first rap record released by a female group and the second single released by Sugar Hill Records rap Sugar Hill Records . ref name Greenberg1999 Greenberg, Steve Light, Alan ed. 1999 . The VIBE History of Hip Hop . Three Rivers Press. p. 28. ISBN 0609805037 ref Elements of Funk You Up were later used by Dr. Dre for his 1995 single Keep Their Heads Ringin . ref Ego Trip s Book of Rap Lists Book of Rap Lists . 1999. Macmillan Publishers Macmillan ... song Let s Do It Again Discography Albums Sugarhill Presents the Sequence 1980 , Sugar Hill Records rap Sugar Hill The Sequence 1982 , Sugar Hill 51 Black Albums The Sequence Party 1983 , Sugar Hill Compilations Funky Sound 1995 , P Vine The Best of the Sequence 1996 , Deep Beats Monster Jam Back ... class artist id p194849 pure url yes The Sequence . Allmusic . External links http www.discogs.com artist Sequence, The Discography DEFAULTSORT Sequence, The Category African American musical groups ... Musical trios Hiphop band stub no The Sequence ... more details
Leader sequence may refer to Leader sequence mRNA , a sequence of mRNA Leading strand , in DNA replication disambig Long comment to avoid being listed on short pages ... more details
wiktionary sequence A sequence is a logically ordered set of elements. Sequence may also refer to Sequence poetry , a medieval Latin poem or its musical setting which became part of the Mass Sequence music , a passage which is successively repeated at different pitches Sequence 1980 short film , 16 minute film directed by David Winning Sequence filming , a series of shots or scenes, edited together in succession Sequence journal Sequence journal , a film journal Sequence game Sequence game , a board and card game distributed by Jax Ltd., Inc. Sequence geology , a succession of geological events Sequence biology , the primary structure of a biopolymer Primary sequence , the sequence of a biological macromolecule Sequencing , determining the primary structure of an unbranched biopolymer DNA sequencing , determining the order of the nucleotide bases in a DNA molecule Sequence medicine S quences , a Quebec film magazine The Sequence , a 1980s all female hip hop funk trio Archaeological sequenceSequence diagram Sequence Diagram , a kind of UML diagram See also Sequencer disambiguation disambig an Seq encia bs Niz vor de Sequenz es Secuencia fr S quence pt Sequ ncia ru uk ... more details
Unreferenced date December 2009 The recognition sequence , sometimes also referred to as recognition site , of any DNA binding domain DNA binding protein motif that exhibits binding specificity, refers to the DNAsequence or subset thereof , to which the domain is specific. Palindromic sequence Recognition sequences are palindromes . The transcription factor Sp1 biology Sp1 for example, binds the sequences 5 G T GGGCGG G A G A C T 3 , where G T indicates that the domain will bind a guanine or thymine at this position. The restriction endonuclease PstI recognizes, binds, and cleaves the sequence 5 CTGCAG 3 . However, a recognition sequence refers to a different aspect from that of recognition site . A given recognition sequence can occur one or more times, or not at all on a specific DNA fragment. A recognition site is specified by the position of the site. For example, there are two PstI recognition site in the following DNAsequence fragment, start at base 9 and 31 respectively. A recognition sequence is a specific sequence, usually very short less than 10 bases . Depending on the degree of specificity of the protein, a DNA binding protein can bind to more than one specific sequence. For PstI, which has a single sequence specificity, it is 5 CTGCAG 3 . It is always the same whether at the first recognition site or the second in the following example sequence. For Sp1, which has multiple 16 sequence specificity as shown above, the two recognition sites in the following example sequence fragment are at 18 and 32, and their respective recognition sequences are 5 GGGGCGGAGC 3 and 5 TGGGCGGAAC 3 . 5 AACGTTAG CTGCAG TC GGGGCGGAGC TAGG CTGCAG GAAT TGGGCGGAAC CT 3 See also DNA binding domain Transcription factor Classes , for more examples DEFAULTSORT Recognition Sequence Category Genetics Category Proteins Genetics stub ... more details
Unreferenced stub auto yes date December 2009 dicdef Orphan date December 2009 A canonical sequence is a sequence of DNA , RNA , or amino acid s that reflects the most common choice of base chemistry base or amino acid at each position. See also Homology biology DEFAULTSORT Canonical Sequence Category Genetics Genetics stub ... more details
Orphan date February 2009 C DNA also known as C form DNA . It is one of the many possible double helical structures of DNA . This form of DNA can be observed at some conditions such as relatively low humidity and the presence of certain ions , such as Li sup sup or Mg sup 2 sup . Recent research suggests that both C DNA and B DNA consist of two distinct nucleotide Conformational isomerism conformation s, B I and B II. The ratio of B II conformation in C DNA is more than 40 . However, the ratio of B II conformation in B DNA is only about 10 . See also B DNA A DNA Mechanical properties of DNA References cite journal author L van Dam, M H Levitt title BII nucleotides in the B and C forms of natural sequence polymeric DNA A new model for the C form of DNA journal J Mol Biol volume 304 issue 4 pages 541 61 year 2000 pmid 11099379 doi 10.1006 jmbi.2000.4194 Biochem stub Nucleic acids Category DNA zh C DNA ... more details
Unreferenced date December 2009 A sequence in biology is the one dimensional ordering of monomer s, covalent bond covalently linked within a biopolymer it is also referred to as the primary structure of the biological macromolecule . See also Protein sequenceDNAsequence Self incompatibility in plants List of geneticists Human Genome Project Dot plot bioinformatics Multiplex Ligation dependent Probe Amplification Sequence analysis DEFAULTSORT Sequence Biology Category Molecular biology Biology stub fa fr S quence biologique ... more details
000031999 satellite DNA ref The name satellite DNA refers to how repetitions of a short DNAsequence ... books?id MPkwi i33zYC&pg PA53 External links MeshName Satellite DNA Repeated sequence DEFAULTSORT Satellite Dna Category Repetitive DNA sequences de Satelliten DNA fr ADN satellite he DNA it DNA satellite sv Satellit DNA tr Satelit DNA ...Satellite DNA consists of very large arrays of tandemly arrayed genes tandemly repeating, non coding DNA . Satellite DNA is the main component of functional centromeres , and form the main structural constituent of heterochromatin . ref cite book author Knight, Julian C. title Human Genetic Diversity ... , and thus have a different density from bulk DNA such that they form a second or satellite band when genomic DNA is separated on a Density Gradient density gradient . citation needed date January 2011 Types of satellite DNA Satellite DNA, together with minisatellite and Microsatellite genetics microsatellite DNA, constitute the tandem repeats . ref MeshName Tandem Repeat ref Some types of satellite DNA in humans are class wikitable Type Size of repeat unit bp Location alphoid DNA 171 All chromosomes ... 3 5 Most chromosomes Length A repeated DNA motif pattern can be between 1 base pair long a mononucleotide repeat to several thousand base pairs long, and the total size of a satellite DNA block can be several megabases without interruption. Most satellite DNA is localized to the telomeric or the centromeric region of the chromosome. The nucleotide sequence of the repeats is fairly well conserved ... DNA is a short region 1 5kb of 20 50 repeats. The difference in how many of the repeats is present in the region length of the region is the basis for DNA fingerprinting . citation needed date January 2011 Origin Satellite DNA, at least the microsatellite variety, is thought to have originated by slippage ... book author Beridze, Thengiz title Satellite DNA publisher Springer Verlag year 1986 isbn 978 0387158761 ... more details
Signal sequence can refer to Protein targeting Signal peptide DNA uptake signal sequence disambig Short pages monitor This long comment was added to the page to prevent it being listed on Special Shortpages. It and the accompanying monitoring template were generated via Template Longcomment. Please do not remove the monitor template without removing the comment as well. ... more details
Unreferenced stub auto yes date December 2009 A DNA construct is an artificially constructed segment of nucleic acid that is going to be transplanted into a target Biological tissue tissue or Cell biology cell . It often contains a DNA insert, which contains the gene sequence encoding a protein of interest, that has been subcloned into a Vector molecular biology vector , which contains bacterial resistance genes for growth in bacteria , and Promoter biology promoter s for expression in the organism. A DNA construct may express wildtype protein, prevent the expression of certain genes by expressing competitors or inhibitors, or express mutant proteins, such as deletion mutations or missense mutation s. A DNA construct is often used in molecular biology to analyze macromolecules such as proteins or RNA in more detail. See also Rescue construct Disruption construct DEFAULTSORT Dna Construct Category DNA Biochem stub simple DNA construct ... more details
DNA. DNA synthesis will displace the single stranded region and then a second nick at the left border region will release the single stranded T DNA fragment. This fragment can then be incorporated into a host genome. T DNA mutagenesis The same procedure of T DNA transfer can be used to disrupt genes via insertional mutagenesis . Not only does the inserted T DNAsequence create a mutation but it also ...Image Ti plasmid.svg thumb 350px right Ti plasmid with T DNA region The transfer DNA abbreviated T DNA is the transferred deoxyribonucleic acid DNA of the Ti plasmid tumor inducing Ti plasmid of some species of bacteria such as Agrobacterium tumefaciens and Agrobacterium rhizogenes . It derives its name from the fact that the bacterium transfers this DNA fragment into the host plant s cell nucleus nuclear DNA genome . The T DNA is bordered by 25 base pair repeats on each end. Transfer is initiated .... The bacterial T DNA is about 20,000 base pairs long and contains gene s that code for enzyme s synthesizing opines and phytohormone s. By transferring the T DNA into the plant genome, the bacterium ... are amino acid derivatives used by the bacterium as a source of carbon and energy. T DNA transformation Agrobacterium mediated T DNA transfer is widely used as a tool in biotechnology . In genetic engineering , the tumor promoting and opine synthesis genes are removed from the T DNA and replaced ... of glutamine synthetase . Agrobacterium is then used as a vector to transfer the engineered T DNA ... transgenic plant s carrying a foreign gene. Mechanism of T DNA Transformation The first step in integrating the T DNA into a host genome is the formation of nick at the right border of the Ti plasmid. This nick creates a region of single stranded DNA from the left border of the T DNA gene over to the right ..., ISBN 0 7167 1007 2 DEFAULTSORT T Dna Category Biotechnology Category Plant pathogens and diseases Category Mobile genetic elements biotech stub botany stub genetics stub fr ADN T pl T DNA sv T DNA ... more details
DNA footprinting is a method of investigating the sequence specificity of DNA binding proteins in vitro. This technique can be used to study protein DNA interactions both outside and within cells. The regulation ... agent can be chosen, depending on your DNAsequence and ligand of interest. The following cleavage ... its action blocked by a bound protein on a DNAsequence. In addition, the DNase I enzyme is easily ... I. The enzyme does not cut DNA randomly its activity is affected by local DNA structure and sequence ... size, the resulting DNA footprint has high resolution. Unlike DNase I they have no sequence dependence ... promoters , enhancers , or Silencer DNA silencers to drive or repress transcription are fundamental to understanding the unique regulation of individual genes within the genome . Techniques like DNA footprinting will help elucidate which proteins bind to these regions of DNA and unravel the complexities of transcriptional control. Method Image Courtney 2008.jpg thumb center 550px Figure 1. DNA footprinting ... binds to a region of interest within a DNA molecule. The wet lab methodology is summarized, with appropriate ... Head V, and Fox K. 2007 Footprinting A method for determining the sequence selectivity, affinity and kinetics of DNA binding ligands. Methods. 42 128 140. ref Polymerase chain reaction PCR amplify and label ... 50 to 200 base pairs in length. Add protein of interest to a portion of the labeled template DNA ... portions of DNA template. The cleavage agent is a chemical or enzyme that will cut at random locations in a sequence independent manner. The reaction should occur just long enough to cut each DNA molecule in only one location. A protein that specifically binds a region within the DNA template will protect the DNA it is bound to from the cleavage agent. Run both samples side by side on a polyacrylamide gel electrophoresis . The portion of DNA template without protein will be cut at random locations, and thus when it is run on a gel, will produce a ladder like distribution. The DNA template with the protein ... more details
A DNA machine is a molecular machine constructed from DNA . Research into DNA machines was pioneered in the late 1980s by Nadrian Seeman and co workers from New York University . DNA is used because of the numerous biological tools already found in nature that can affect DNA, and the immense knowledge of how DNA works previously researched by biochemistry biochemists . DNA machines can be logically designed since DNA assembly of the double helix is based on strict rules of base pairing that allow portions of the strand to be predictably connected based on their sequence. This selective stickiness is a key advantage in the construction of DNA machines. An example of a DNA machine was reported by Bernard Yurke and co workers at Lucent Technologies in the year 2000, who constructed molecular tweezers out of DNA. ref name pmid10949296 cite journal author Yurke B, Turberfield AJ, Mills AP, Simmel FC, Neumann JL title A DNA fuelled molecular machine made of DNA journal Nature volume 406 issue 6796 pages 605 8 year 2000 month August pmid 10949296 doi 10.1038 35020524 url ref The DNA tweezers contain three strands A, B and C. Strand A latches onto half of strand B and half of strand C, and so it joins them all together. Strand A acts as a hinge so that the two arms &mdash AB and AC &mdash can move. The structure floats with its arms open wide. They can be pulled shut by adding a fourth strand of DNA D programmed to stick to both of the dangling, unpaired sections of strands B and C. The closing ... E with the right sequence to pair up with strand D. Once paired up, they have no connection to the machine BAC, so float away. The DNA machine can be opened and closed repeatedly by cycling between strands ... a self assembled DNA tetrahedron . The state of the device can be determined by measuring the separation ... reflist See also DNA nanotechnology Category DNA nanotechnology Category Molecular machines sci stub ar it Macchina di DNA ru tr DNA makinalar ... more details
Peptide sequence or amino acid sequence is the order in which amino acid residues, connected by peptide bond s, lie in the chain in peptide s and protein s . The sequence is generally reported from the N terminal end containing free amino group to the C terminal end containing free carboxyl group . Peptide sequence is often called protein sequence if it represents the primary structure of a protein . Sequence notation and applications Many peptide sequences have been in sequence database s. These databases may use various notations to describe the peptide sequence. The full names of the amino acids are rarely given instead, Amino acid Table of standard amino acid abbreviations and properties 3 letter or 1 letter abbreviations are usually recorded for conciseness. Several deductions can be made from the sequence itself. Long stretches of hydrophobic residues may indicate transmembrane helix transmembrane helices . These helices may indicate the peptide is a cell receptor . Certain residues indicate a beta sheet area. If full length protein sequence is available, it is possible to estimate the isoelectric point of the protein. Methods for determining the peptide sequence include deduction from DNAsequence, Edman degradation , and mass spectrometry . Techniques in sequence analysis can be applied to learn more about the peptide. These techniques generally consist of comparing the sequence to other sequences from sequence databases. Other sequences may have already been studied and determined to be significant. Findings about these sequences may be applicable to the sequence under investigation. See also Protein Protein sequencing Rosetta home SIMAP External links http www.nslij genetics.org dnacorr A bibliography on features, patterns, correlations in DNA and protein texts Category Protein structure Category Bioinformatics de Aminos uresequenz el es Secuencia de amino cidos eo Aminoacida sinsekvo ko it Sequenza peptidica pt Sequ ncia pept dica ... more details
Refimprove date December 2009 File DNA Sequencers from Flickr 57080968.jpg thumb right DNA sequencers A DNA sequencer is a scientific instrument used to automate the DNA sequencing process. It can be also considered an optical instrument as it generally analyzes light signals originating from fluorochrome s attached to nucleotides. Modern automated DNA sequencing instruments called DNA sequencers are able to sequence multiple samples in a batch run and perform as many as 24 runs a day. These perform only the size separation and peak reading the actual sequencing reaction s , cleanup and resuspension in a suitable buffer must be performed separately. The magnitude of the fluorescent signal is related to the number of strands of DNA that are in the reaction. If the initial amount of DNA is small, the signals will be weak. However, the properties of PCR allow one to increase the signal by increasing the number of cycles in the PCR program. A simple DNA sequencer will have one or more lasers that emit at a wavelength that is absorbed by the fluorescent dye that has been attached to the DNA strand of interest. It will then have one or more optical detectors that can detect at the wavelength that the dye fluoresces at. The presence or absence of a strand of DNA is then detected by monitoring the output of the detector. Since shorter strands of DNA move through the gel matrix faster they are detected sooner and there is then a direct correlation between length of DNA strand and time at the detector. This relationship is then used to determine the actual DNAsequence. The output of these machines is not perfect as it may contain reading errors and needs to be processed see Sequence ..., today, modern software can automatically process the output in seconds. Other Applications DNA ... laboratories, suggests that DNA sequencers may be used to study temperature dependent events ... Dna Sequencer Category Scientific instruments Category Molecular biology Category DNA sequencing ... more details
example DNAsequence A CT N A YR In this Sequence motif Pattern description notations notation , A means ... sequences. Thus a consensus sequence is a model for a putative DNA binding site it is obtained by aligning all known examples of a certain recognition site and defined as the idealized sequence ...In molecular biology and bioinformatics , consensus sequence refers to the most common nucleotide or amino acid at a particular position after multiple sequences are aligned. A consensus sequence is a way of representing the results of a multiple sequence alignment , where related sequences are compared to each other, and similar functional sequence motif s are found. The consensus sequence shows which residues are most abundant in the alignment at each position. Sequence analysis Developing software ... sequence motif s can function as regulatory sequence s controlling biosynthesis, or as signal sequence s that direct a molecule to a specific site within the cell or regulate its maturation ... of conservation of these sites. Notation The conserved sequence motifs are called consensus sequences ... at that position. An alternative method of representing a consensus sequence uses a sequence logo . This is a graphical representation of the consensus sequence, in which the size of a symbol is related to the frequency that a given nucleotide or amino acid occurs at a certain position. In sequence ..., the smaller the symbol. Sequence logos can be generated using http weblogo.berkeley.edu WebLogo ... . ref name Schneider2002 cite journal author Schneider TD title Consensus Sequence Zen journal ... significance A protein binding site, represented by a consensus sequence, may be a short sequence ... consensus sequences, usually corresponding to the site where they cut the DNA. Transposons act ... sequence to look more like the consensus sequence is known as an up mutation . This kind of mutation will generally make the promoter stronger and thus the RNA polymerase forms a tighter bind to the DNA ... more details
DNA gyrase , often referred to simply as gyrase , is an enzyme that relieves strain while double stranded DNA is being unwound by helicase . This causes negative supercoiling of the DNA. Bacteria l DNA .... DNA gyrase is a type II topoisomerase EC number 5.99.1.3 that introduces negative supercoil s or relaxes positive supercoils into DNA by looping the template so as to form a crossing, then cutting ... , whose single circular DNA is cut by DNA gyrase and the two ends are then twisted around each ... negative supercoils into DNA is what allows bacterial DNA to have free negative supercoils. The ability of gyrase to relax positive supercoils comes into play during DNA replication . The right handed nature of the DNA double helix causes positive supercoils to accumulate ahead of a translocating enzyme, in the case of DNA replication, a DNA polymerase . The ability of gyrase and topoisomerase IV ... pubmed docsum Mechanochemical Analysis of DNA Gyrase Using Rotor Bead Tracking , Nature 2006 Jan 5 Vol. 439 100 104. ref has characterized gyrase activity as a function of DNA tension applied force and Adenosine triphosphate ATP , and proposed a mechanochemical model. Upon binding to DNA the Gyrase DNA state , there is a competition between DNA wrapping and dissociation, where increasing DNA ... are not entirely similar in structure or sequence, and have different affinities for different ... work by competitive inhibition of energy transduction of DNA gyrase by binding to the ATPase active ... bind these enzymes and prevent them from decatenating replicating DNA. Quinolone resistant bacteria frequently harbor mutated topoisomerases that resist quinolone binding. Notes reflist DNA ... carries out nicking of DNA,B subunit introduces negative supercoils,and then A subunit reseals the strands.Fluorquinolones .... References Molecular Cloning of Apicoplast Targeted Plasmodium falciparum DNA Gyrase Genes Unique ..., Mar. 2007, p. 398 412 Topoisomerases DNA replication Category DNA Category EC 5.99.1 Category ... more details
Not to be confused with the book The Selfish Gene . Selfish DNA refers to those sequences of DNA which, in their purest form, have two distinct properties 1 the DNAsequence spreads by forming additional copies of itself within the genome and 2 it makes no specific contribution to the reproductive success of its host organism . This idea was sketched briefly by Richard Dawkins in his 1976 book The Selfish Gene and was explicitly exposed in two 1980 articles in Nature magazine. According to one of these articles quotation The theory of natural selection, in its more general formulation, deals with the competition between replicating entities. It shows that, in such a competition, the more efficient replicators increase in number at the expense of their less efficient competitors. After a sufficient time, only the most efficient replicators survive. L.E. Orgel & F.H.C. Crick Selfish DNA the ultimate parasite The selfish DNA can be considered an efficient replicator that follows another way of increasing in number. Examples Transposon s copy themselves to different locus genetics loci inside the genome. These elements constitute a large fraction of eukaryotic genome size s C value s about 45 of the human genome is composed of transposons and their defunct remnants. Homing endonuclease gene s cleave DNA at its own site on the homologous chromosome , triggering the DNA repair Double strand breaks DNA double stranded break repair system, which repairs the break by copying the HEG onto the homologous chromosome. HEGs have been characterized in yeast , and can only survive by passing between multiple isolated populations or species. Supernumerary B chromosome s are essential chromosomes that are transmitted in higher than expected frequencies, which leads to their accumulation in progenies ... & Crick , F.H.C. 1980 Selfish DNA the ultimate parasite. Nature, 284, 604 607. Category DNA Category Selection he DNA pl Samolubny DNA zh DNA ... more details
DNA shuffling is a way to rapidly propagate beneficial mutation s in a directed evolution experiment. It is used to rapidly increase DNA library size. ref cite journal last Cohen first J. title How DNA Shuffling Works journal Science volume 293 issue 5528 pages 237 237 doi 10.1126 science.293.5528.237 accessdate 8 May 2011 ref Procedure DNAse is firstly used to fragment a set of parent gene s into pieces of 50 100 base pair bp in length. This is then followed by a polymerase chain reaction PCR without primers DNA fragments with sufficient overlapping homologous sequence will anneal to each other and are then extended by DNA polymerase . Several rounds of this PCR extension are allowed to occur, after some of the DNA molecules reach the size of the parental genes. These genes can then be amplified with another PCR, this time with the addition of Primer molecular biology primers that are designed to complement the ends of the strands. The primers may have additional sequences added to their 5 ends, such as sequences for restriction enzyme recognition sites needed for ligation into a cloning vector. It is possible to recombination recombine portion of these genes to generate hybrids or Chimera genetics chimeric forms with unique properties, this is called DNA shuffling. Shuffling methods Using restriction enzymes Restriction enzyme s that cut in similar places are used to digest members of the gene family DNA fragments are joined together with DNA ligase Large numbers of hybrid biology hybrids are produced which can be tested for unique properties Using DNAse 1 Different members of the gene family are fragmented using DNAse 1 followed by PCR During PCR different members of the family are cross primed, DNA fragments with high homology biology homology will anneal to each other The generated hybrids are then used to generate a DNA library library of mutants which are tested ... references DEFAULTSORT Dna Shuffling Category DNA es Barajado de ADN ... more details
In bioinformatics , sequence clustering algorithm s attempt to group biological sequence s that are somehow related. The sequences can be either of genomic, transcriptomic expressed sequence tag ESTs or protein ... gene before the ESTs are sequence assembly assembled to reconstruct the original mRNA . Some clustering ... a representative sequence for each cluster and assigns a new sequence to that cluster if it is sufficiently similar to the representative if a sequence is not matched then it becomes the representative sequences representative sequence for a new cluster. The similarity score is often based on sequence alignment . Sequence clustering is often used to make a Non redundant sequence non redundant set of representative sequences . Sequence clusters are often synonymous with but not identical to protein family protein families . Determining a representative tertiary structure for each sequence cluster is the aim of many structural genomics initiatives. External links Sequence clustering packages http www.drive5.com uclust UCLUST An exceptionally fast sequence clustering program for nucleotide and protein sequences http www.ebi.ac.uk holm nrdb90 RDB90 and nrdb90.pl a nonredundant sequence database ... sunkim BAG BAG a graph theoretic sequence clustering algorithm http cd hit.org CD HIT a ultra fast ... JESAM Open source parallel scalable DNA alignment engine with optional clustering software component ... http bugaco.com bioinf clusterer Clusterer extendable java application for sequence grouping ... sequences http www.ebi.ac.uk clustr CluSTr A single linkage protein sequence clustering database from Smith Waterman sequence similarities covers over 7 mln sequences including UniProt and IPI http www.littlest.co.uk software bioinf old packages icatools ICAtools original ancient DNA clustering ... tools VOCS Virus Orthologous Clusters A viral protein sequence clustering database contains all ... try the above although both are wobbly http bio.cc RSDB RSDB broken link Non redundant sequence databases ... more details
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