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Text of the page (random words):
may be treated with an enzyme alkaline phosphatase that dephosphorylates the vector ends vector molecules with dephosphorylated ends are unable to replicate and replication can only be restored if foreign dna is integrated into the cleavage site 12 preparation of dna to be cloned edit dna for cloning is most commonly produced using pcr template dna is mixed with bases the building blocks of dna primers short pieces of complementary single stranded dna and a dna polymerase enzyme that builds the dna chain the mix goes through cycles of heating and cooling to produce large quantities of copied dna for cloning of genomic dna the dna to be cloned is extracted from the organism of interest virtually any tissue source can be used even tissues from extinct animals 13 as long as the dna is not extensively degraded the dna is then purified using simple methods to remove contaminating proteins extraction with phenol rna ribonuclease and smaller molecules precipitation and or chromatography polymerase chain reaction pcr methods are often used for amplification of specific dna or rna rt pcr sequences prior to molecular cloning dna for cloning experiments may also be obtained from rna using reverse transcriptase complementary dna or cdna cloning or in the form of synthetic dna artificial gene synthesis cdna cloning is usually used to obtain clones representative of the mrna population of the cells of interest while synthetic dna is used to obtain any precise sequence defined by the designer such a designed sequence may be required when moving genes across genetic codes for example from the mitochondria to the nucleus 14 or simply for increasing expression via codon optimization 15 the purified dna is then treated with a restriction enzyme to generate fragments with ends capable of being linked to those of the vector if necessary short double stranded segments of dna linkers containing desired restriction sites may be added to create end structures that are compatible with the vector 3 12 creation of recombinant dna with dna ligase edit the creation of recombinant dna is in many ways the simplest step of the molecular cloning process dna prepared from the vector and foreign source are simply mixed together at appropriate concentrations and exposed to an enzyme dna ligase that covalently links the ends together this joining reaction is often termed ligation the resulting dna mixture containing randomly joined ends is then ready for introduction into the host organism dna ligase only recognizes and acts on the ends of linear dna molecules usually resulting in a complex mixture of dna molecules with randomly joined ends the desired products vector dna covalently linked to foreign dna will be present but other sequences e g foreign dna linked to itself vector dna linked to itself and higher order combinations of vector and foreign dna are also usually present this complex mixture is sorted out in subsequent steps of the cloning process after the dna mixture is introduced into cells 3 12 introduction of recombinant dna into host organism edit the dna mixture previously manipulated in vitro is moved back into a living cell referred to as the host organism the methods used to get dna into cells are varied and the name applied to this step in the molecular cloning process will often depend upon the experimental method that is chosen e g transformation transduction transfection electroporation 3 12 when microorganisms are able to take up and replicate dna from their local environment the process is termed transformation and cells that are in a physiological state such that they can take up dna are said to be competent 16 in mammalian cell culture the analogous process of introducing dna into cells is commonly termed transfection both transformation and transfection usually require preparation of the cells through a special growth regime and chemical treatment process that will vary with the specific species and cell types that are used electroporation uses high voltage electrical pulses to translocate dna across the cell membrane and cell wall if present 17 in contrast transduction involves the packaging of dna into virus derived particles and using these virus like particles to introduce the encapsulated dna into the cell through a process resembling viral infection although electroporation and transduction are highly specialized methods they may be the most efficient methods to move dna into cells selection of organisms containing vector sequences edit whichever method is used the introduction of recombinant dna into the chosen host organism is usually a low efficiency process that is only a small fraction of the cells will actually take up dna experimental scientists deal with this issue through a step of artificial genetic selection in which cells that have not taken up dna are selectively killed and only those cells that can actively replicate dna containing the selectable marker gene encoded by the vector are able to survive 3 12 when bacterial cells are used as host organisms the selectable marker is usually a gene that confers resistance to an antibiotic that would otherwise kill the cells typically ampicillin cells harboring the plasmid will survive when exposed to the antibiotic while those that have failed to take up plasmid sequences will die when mammalian cells e g human or mouse cells are used a similar strategy is used except that the marker gene in this case typically encoded as part of the kanmx cassette confers resistance to the antibiotic geneticin screening for clones with desired dna inserts and biological properties edit modern bacterial cloning vectors e g puc19 and later derivatives including the pgem vectors use the blue white screening system to distinguish colonies clones of transgenic cells from those that contain the parental vector i e vector dna with no recombinant sequence inserted in these vectors foreign dna is inserted into a sequence that encodes an essential part of beta galactosidase an enzyme whose activity results in formation of a blue colored colony on the culture medium that is used for this work insertion of the foreign dna into the beta galactosidase coding sequence disables the function of the enzyme so that colonies containing transformed dna remain colorless white therefore experimentalists are easily able to identify and conduct further studies on transgenic bacterial clones while ignoring those that do not contain recombinant dna the total population of individual clones obtained in a molecular cloning experiment is often termed a dna library libraries may be highly complex as when cloning complete genomic dna from an organism or relatively simple as when moving a previously cloned dna fragment into a different plasmid but it is almost always necessary to examine a number of different clones to be sure that the desired dna construct is obtained this may be accomplished through a very wide range of experimental methods including the use of nucleic acid hybridizations antibody probes polymerase chain reaction restriction fragment analysis and or dna sequencing 3 12 applications edit molecular cloning provides scientists with an essentially unlimited quantity of any individual dna segments derived from any genome this material can be used for a wide range of purposes including those in both basic and applied biological science a few of the more important applications are summarized here genome organization and gene expression edit molecular cloning has led directly to the elucidation of the complete dna sequence of the genomes of a very large number of species and to an exploration of genetic diversity within individual species work that has been done mostly by determining the dna sequence of large numbers of randomly cloned fragments of the genome and assembling the overlapping sequences at the level of individual genes molecular clones are used to generate probes that are used for examining how genes are expressed and how that expression is related to other processes in biology including the metabolic environment extracellular signals development learning senescence and cell death cloned genes can also provide tools to examine the biological function and importance of individual genes by allowing investigators to inactivate the genes or make more subtle mutations using regional mutagenesis or site directed mutagenesis genes cloned into expression vectors for functional cloning provide a means to screen for genes on the basis of the expressed protein s function production of recombinant proteins edit obtaining the molecular clone of a gene can lead to the development of organisms that produce the protein product of the cloned genes termed a recombinant protein in practice it is frequently more difficult to develop an organism that produces an active form of the recombinant protein in desirable quantities than it is to clone the gene this is because the molecular signals for gene expression are complex and variable and because protein folding stability and transport can be very challenging many useful proteins are currently available as recombinant products these include 1 medically useful proteins whose administration can correct a defective or poorly expressed gene e g recombinant factor viii a blood clotting factor deficient in some forms of hemophilia 18 and recombinant insulin used to treat some forms of diabetes 19 2 proteins that can be administered to assist in a life threatening emergency e g tissue plasminogen activator used to treat strokes 20 3 recombinant subunit vaccines in which a purified protein can be used to immunize patients against infectious diseases without exposing them to the infectious agent itself e g hepatitis b vaccine 21 and 4 recombinant proteins as standard material for diagnostic laboratory tests transgenic organisms edit once characterized and manipulated to provide signals for appropriate expression cloned genes may be inserted into organisms generating transgenic organisms also termed genetically modified organisms gmos although most gmos are generated for purposes of basic biological research see for example transgenic mouse a number of gmos have been developed for commercial use ranging from animals and plants that produce pharmaceuticals or other compounds pharming herbicide resistant crop plants and fluorescent tropical fish glofish for home entertainment 1 gene therapy edit gene therapy involves supplying a functional gene to cells lacking that function with the aim of correcting a genetic disorder or acquired disease gene therapy can be broadly divided into two categories the first is alteration of germ cells that is sperm or eggs which results in a permanent genetic change for the whole organism and subsequent generations this germ line gene therapy is considered by many to be unethical in human beings 22 the second type of gene therapy somatic cell gene therapy is analogous to an organ transplant in this case one or more specific tissues are targeted by direct treatment or by removal of the tissue addition of the therapeutic gene or genes in the laboratory and return of the treated cells to the patient clinical trials of somatic cell gene therapy began in the late 1990s mostly for the treatment of cancers and blood liver and lung disorders 23 despite a great deal of publicity and promises the history of human gene therapy has been characterized by relatively limited success 23 the effect of introducing a gene into cells often promotes only partial and or transient relief from the symptoms of the disease being treated some gene therapy trial patients have suffered adverse consequences of the treatment itself including deaths in some cases the adverse effects result from disruption of essential genes within the patient s genome by insertional inactivation in others viral vectors used for gene therapy have been contaminated with infectious virus nevertheless gene therapy is still held to be a promising future area of medicine and is an area where there is a significant level of research and development activity see also edit golden gate cloning references edit 1 2 watson jd 2007 recombinant dna genes and genomes a short course san francisco w h freeman isbn 978 0 7167 2866 5 patten cl glick br pasternak j 2009 molecular biotechnology principles and applications of recombinant dna washington d c asm press isbn 978 1 55581 498 4 1 2 3 4 5 6 7 8 brown t 2006 gene cloning and dna analysis an introduction cambridge ma blackwell pub isbn 978 1 4051 1121 8 garrett rh grisham cm 2013 biochemistry fifth ed brooks cole cengage learning isbn 978 1 133 10629 6 oclc 777722371 garrett rh grisham cm 2010 biochemistry fourth ed belmont ca brooks cole cengage learning p 380 isbn 978 0 495 10935 8 oclc 297392560 nathans d smith ho 1975 restriction endonucleases in the analysis and restructuring of dna molecules annual review of biochemistry 44 273 93 doi 10 1146 annurev bi 44 070175 001421 pmid 166604 cohen sn chang ac boyer hw helling rb nov 1973 construction of biologically functional bacterial plasmids in vitro proceedings of the national academy of sciences of the united states of america 70 11 3240 4 bibcode 1973pnas 70 3240c doi 10 1073 pnas 70 11 3240 pmc 427208 pmid 4594039 jackson da symons rh berg p oct 1972 biochemical method for inserting new genetic information into dna of simian virus 40 circular sv40 dna molecules containing lambda phage genes and the galactose operon of escherichia coli proceedings of the national academy of sciences of the united states of america 69 10 2904 9 bibcode 1972pnas 69 2904j doi 10 1073 pnas 69 10 2904 pmc 389671 pmid 4342968 plasmid plasmids learn science at scitable www nature com retrieved 2017 12 06 shizuya h birren b kim uj mancino v slepak t tachiiri y simon m sep 1992 cloning and stable maintenance of 300 kilobase pair fragments of human dna in escherichia coli using an f factor based vector proceedings of the national academy of sciences of the united states of america 89 18 8794 7 bibcode 1992pnas 89 8794s doi 10 1073 pnas 89 18 8794 pmc 50007 pmid 1528894 pingoud a jeltsch a september 2001 structure and function of type ii restriction endonucleases nucleic acids research 29 18 3705 3727 doi 10 1093 nar 29 18 3705 pmc 55916 pmid 11557805 1 2 3 4 5 6 russell dw sambrook j 2001 molecular cloning a laboratory manual cold spring harbor n y cold spring harbor laboratory isbn 978 0 87969 576 7 higuchi r bowman b freiberger m ryder oa wilson ac 1984 dna sequences from the quagga an extinct member of the horse family nature 312 5991 282 284 bibcode 1984natur 312 282h doi 10 1038 312282a0 pmid 6504142 s2cid 4313241 boominathan a vanhoozer s basisty n powers k crampton al wang x et al november 2016 stable nuclear expression of atp8 and atp6 genes rescues a mtdna complex v null mutant nucleic acids research 44 19 9342 9357 doi 10 1093 nar gkw756 pmc 5100594 pmid 27596602 plotkin jb kudla g january 2011 synonymous but not ...