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alec jeffreys 159 and first used in forensic science to convict colin pitchfork in the 1988 enderby murders case 160 the development of forensic science and the ability to now obtain genetic matching on minute samples of blood skin saliva or hair has led to re examining many cases evidence can now be uncovered that was scientifically impossible at the time of the original examination combined with the removal of the double jeopardy law in some places this can allow cases to be reopened where prior trials have failed to produce sufficient evidence to convince a jury people charged with serious crimes may be required to provide a sample of dna for matching purposes the most obvious defense to dna matches obtained forensically is to claim that cross contamination of evidence has occurred this has resulted in meticulous strict handling procedures with new cases of serious crime dna profiling is also used successfully to positively identify victims of mass casualty incidents 161 bodies or body parts in serious accidents and individual victims in mass war graves via matching to family members dna profiling is also used in dna paternity testing to determine if someone is the biological parent or grandparent of a child with the probability of parentage is typically 99 99 when the alleged parent is biologically related to the child usually dna sequencing are carried out after birth but there are new methods to test paternity while a mother is still pregnant 162 dna enzymes or catalytic dna further information deoxyribozyme deoxyribozymes also called dnazymes or catalytic dna were first discovered in 1994 163 they are mostly single stranded dna sequences isolated from a large pool of random dna sequences through a combinatorial approach called in vitro selection or systematic evolution of ligands by exponential enrichment selex dnazymes catalyze variety of chemical reactions including rna dna cleavage rna dna ligation amino acids phosphorylation dephosphorylation carbon carbon bond formation etc dnazymes can enhance catalytic rate of chemical reactions up to 100 000 000 000 fold over the uncatalyzed reaction 164 the most extensively studied class of dnazymes is rna cleaving types which have been used to detect different metal ions and designing therapeutic agents several metal specific dnazymes have been reported including the gr 5 dnazyme lead specific 163 the ca1 3 dnazymes copper specific 165 the 39e dnazyme uranyl specific and the naa43 dnazyme sodium specific 166 the naa43 dnazyme which is reported to be more than 10 000 fold selective for sodium over other metal ions was used to make a real time sodium sensor in cells bioinformatics further information bioinformatics bioinformatics involves the development of techniques to store data mine search and manipulate biological data including dna nucleic acid sequence data these have led to widely applied advances in computer science especially string searching algorithms machine learning and database theory 167 string searching or matching algorithms which find an occurrence of a sequence of letters inside a larger sequence of letters were developed to search for specific sequences of nucleotides 168 the dna sequence may be aligned with other dna sequences to identify homologous sequences and locate the specific mutations that make them distinct these techniques especially multiple sequence alignment are used in studying phylogenetic relationships and protein function 169 data sets representing entire genomes worth of dna sequences such as those produced by the human genome project are difficult to use without the annotations that identify the locations of genes and regulatory elements on each chromosome regions of dna sequence that have the characteristic patterns associated with protein or rna coding genes can be identified by gene finding algorithms which allow researchers to predict the presence of particular gene products and their possible functions in an organism even before they have been isolated experimentally 170 entire genomes may also be compared which can shed light on the evolutionary history of particular organism and permit the examination of complex evolutionary events dna nanotechnology further information dna nanotechnology the dna structure at left schematic shown will self assemble into the structure visualized by atomic force microscopy at right dna nanotechnology is the field that seeks to design nanoscale structures using the molecular recognition properties of dna molecules 171 dna nanotechnology uses the unique molecular recognition properties of dna and other nucleic acids to create self assembling branched dna complexes with useful properties 172 dna is thus used as a structural material rather than as a carrier of biological information this has led to the creation of two dimensional periodic lattices both tile based and using the dna origami method and three dimensional structures in the shapes of polyhedra 173 nanomechanical devices and algorithmic self assembly have also been demonstrated 174 and these dna structures have been used to template the arrangement of other molecules such as gold nanoparticles and streptavidin proteins 175 dna and other nucleic acids are the basis of aptamers synthetic oligonucleotide ligands for specific target molecules used in a range of biotechnology and biomedical applications 176 history and anthropology further information phylogenetics and genetic genealogy because dna collects mutations over time which are then inherited it contains historical information and by comparing dna sequences geneticists can infer the evolutionary history of organisms their phylogeny 177 this field of phylogenetics is a powerful tool in evolutionary biology if dna sequences within a species are compared population geneticists can learn the history of particular populations this can be used in studies ranging from ecological genetics to anthropology information storage main article dna digital data storage dna as a storage device for information has enormous potential since it has much higher storage density compared to electronic devices however high costs slow read and write times memory latency and insufficient reliability has prevented its practical use 178 179 history further information history of molecular biology maclyn mccarty left shakes hands with francis crick and james watson co originators of the double helix model based on the x ray diffraction data and insights of rosalind franklin and raymond gosling dna was first isolated by the swiss physician friedrich miescher who in 1869 discovered a microscopic substance in the pus of discarded surgical bandages as it resided in the nuclei of cells he called it nuclein 180 181 in 1878 albrecht kossel isolated the non protein component of nuclein nucleic acid and later isolated its five primary nucleobases 182 183 in 1909 phoebus levene identified the base sugar and phosphate nucleotide unit of rna then named yeast nucleic acid 184 185 186 in 1929 levene identified deoxyribose sugar in thymus nucleic acid dna 187 levene suggested that dna consisted of a string of four nucleotide units linked together through the phosphate groups tetranucleotide hypothesis levene thought the chain was short and the bases repeated in a fixed order in 1927 nikolai koltsov proposed that inherited traits would be inherited via a giant hereditary molecule made up of two mirror strands that would replicate in a semi conservative fashion using each strand as a template 188 189 in 1928 frederick griffith in his experiment discovered that traits of the smooth form of pneumococcus could be transferred to the rough form of the same bacteria by mixing killed smooth bacteria with the live rough form 190 191 this system provided the first clear suggestion that dna carries genetic information in 1933 while studying virgin sea urchin eggs jean brachet suggested that dna is found in the cell nucleus and that rna is present exclusively in the cytoplasm at the time yeast nucleic acid rna was thought to occur only in plants while thymus nucleic acid dna only in animals the latter was thought to be a tetramer with the function of buffering cellular ph 192 193 in 1937 william astbury produced the first x ray diffraction patterns that showed that dna had a regular structure 194 in 1943 oswald avery along with co workers colin macleod and maclyn mccarty identified dna as the transforming principle supporting griffith s suggestion avery macleod mccarty experiment 195 erwin chargaff developed and published observations now known as chargaff s rules stating that in dna from any species of any organism the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine 196 197 a blue plaque outside the eagle pub in cambridge england commemorating crick and watson by 1951 alec todd and collaborators at the university of cambridge had determined by biochemical methods how the backbone of dna is structured via the successive linking of carbon atoms 3 and 5 of the sugar to phosphates this would help to corroborate watson and crick s later x ray structural work 198 todd would later be awarded the 1957 nobel prize in chemistry for this and other discoveries related to dna 199 late in 1951 francis crick started working with james watson at the cavendish laboratory within the university of cambridge dna s role in heredity was confirmed in 1952 when alfred hershey and martha chase in the hershey chase experiment showed that dna is the genetic material of the enterobacteria phage t2 200 photo 51 showing x ray diffraction pattern of dna in may 1952 raymond gosling a graduate student working under the supervision of rosalind franklin took an x ray diffraction image labeled as photo 51 201 at high hydration levels of dna this photo was given to watson and crick by maurice wilkins and was critical to their obtaining the correct structure of dna franklin told crick and watson that the backbones had to be on the outside before then linus pauling and watson and crick had erroneous models with the chains inside and the bases pointing outwards franklin s identification of the space group for dna crystals proved her correct 202 in february 1953 linus pauling and robert corey proposed a model for nucleic acids containing three intertwined chains with the phosphates near the axis and the bases on the outside 203 watson and crick completed their model which is now accepted as the first correct model of the double helix of dna on 28 february 1953 crick interrupted patrons lunchtime at the eagle pub in cambridge england to announce that he and watson had discovered the secret of life 204 pencil sketch of the dna double helix by francis crick in 1953 the 25 april 1953 issue of the journal nature published a series of five articles giving the watson and crick double helix structure dna and evidence supporting it 205 the structure was reported in a letter in which they stated it has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material 8 this letter was followed by a letter from franklin and gosling which was the first publication of their own x ray diffraction data and of their original analysis method 48 206 then followed a letter by wilkins and two of his colleagues which contained an analysis of in vivo b dna x ray patterns and which supported the presence in vivo of the watson and crick structure 49 in april 2023 scientists based on new evidence concluded that rosalind franklin was a contributor and equal player in the discovery process of dna rather than otherwise as may have been presented subsequently after the time of the discovery 207 208 209 in 1962 after franklin s death watson crick and wilkins jointly received the nobel prize in physiology or medicine 210 nobel prizes are awarded only to living recipients a debate continues about who should receive credit for the discovery 211 in an influential presentation in 1957 crick laid out the central dogma of molecular biology which foretold the relationship between dna rna and proteins and articulated the adaptor hypothesis 212 final confirmation of the replication mechanism that was implied by the double helical structure followed in 1958 through the meselson stahl experiment 213 further work by crick and co workers showed that the genetic code was based on non overlapping triplets of bases called codons allowing har gobind khorana robert w holley and marshall warren nirenberg to decipher the genetic code 214 these findings represent the birth of molecular biology 215 in 1986 dna analysis was first used in a criminal investigation when police in the uk requested alec jeffreys of the university of leicester to prove or disprove the involvement in a particular case of a suspect who claimed innocence in the matter although the suspect had already confessed to committing a recent rape murder he was denying any involvement in a similar crime committed three years earlier yet the details of the two cases were so alike that the police concluded both crimes had been committed by the same person however all charges against the suspect were dropped when jeffreys dna testing exonerated the suspect from both the earlier murder and the one to which he d confessed further such dna profiling led to positive identification of another suspect colin pitchfork who in 1988 was found guilty of both rape murders 216 217 see also autosome any chromosome other than a sex chromosome crystallography scientific study of crystal structures dna day holiday celebrated on april 25 dna microarray collection of microscopic dna spots attached to a solid surface dna sequencing process of determining the nucleic acid sequence environmental dna dna sampled from the environment rather than directly from an individual organism genetic code rules by which information encoded within genetic material is translated into proteins genetic disorder health problem from genome abnormalities genetic genealogy dna testing to infer relationships haplotype group of genes from one parent meiosis cell division producing haploid gametes nucleic acid notation universal notation of dna nucleotides nucleic acid sequence succession of nucleotides in a nucleic acid proteopedia forms_of_dna dna replication biological process pages displaying short descriptions of redirect targets ribosomal dna genes coding for ribosomal rna southern blot dna analysis technique transcription biology process of copying a segment of dna into rna x ray scattering techniques family of analytical techniques xeno nucleic acid synthetic nucleic acid analogues references deoxyribonucleic acid merriam webster com dictionary merriam webster oclc 1032680871 d iː ˈ ɒ k s ɪ ˌ r aɪ b oʊ nj uː ˌ k l iː ɪ k ˌ k l eɪ alberts b johnson a lewis j raff m roberts k walter p 2014 molecular biology of the cell 6th ed garland p chapter 4 dna chromosomes and genomes i...
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