WO1996017954A1 - Marquage chimique d'objets - Google Patents

Marquage chimique d'objets Download PDF

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Publication number
WO1996017954A1
WO1996017954A1 PCT/IB1995/001144 IB9501144W WO9617954A1 WO 1996017954 A1 WO1996017954 A1 WO 1996017954A1 IB 9501144 W IB9501144 W IB 9501144W WO 9617954 A1 WO9617954 A1 WO 9617954A1
Authority
WO
WIPO (PCT)
Prior art keywords
tag
informational content
chemical
labelled
labelling
Prior art date
Application number
PCT/IB1995/001144
Other languages
English (en)
Inventor
Peter ALESTRÖM
Original Assignee
Pabio
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from NO944739A external-priority patent/NO944739D0/no
Priority claimed from NO944740A external-priority patent/NO944740D0/no
Application filed by Pabio filed Critical Pabio
Priority to AU39923/95A priority Critical patent/AU701932B2/en
Priority to NZ296197A priority patent/NZ296197A/xx
Priority to EP95938583A priority patent/EP0795029A1/fr
Publication of WO1996017954A1 publication Critical patent/WO1996017954A1/fr
Priority to NO972610A priority patent/NO972610L/no

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6813—Hybridisation assays
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6813—Hybridisation assays
    • C12Q1/6816—Hybridisation assays characterised by the detection means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/46—Elements suited for chemical verification or impeding chemical tampering, e.g. by use of eradicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G01N33/1826—Water organic contamination in water

Definitions

  • the present invention relates to the field of labelling and tracing objects such as industrial products, antiquities, works of art etc. as well as labelling and tracing biological material such as living organisms and vira. More specifi ⁇ cally, the invention pertains to a method for chemical labelling of objects for later determination of their iden ⁇ tity and/or origin, chemically labelled objects, and a method for the determination of identity and/or origin of such labelled objects.
  • Labelling or tagging of physical objects in order to prevent or detect theft, counterfeit, forgery, infringement of copy- right, unlawful or accidental pollution of the environment etc. requires that a number of criteria are met by the labelling method.
  • a label should exhibit a certain degree of specificity for the labelled object, since the value of the label as an identification marker will decrease with its progressive lack of specificity.
  • the degree of specificity needed will of course be dependent on the scenario wherein the label is utilised ( i . e . whether it has been used in order to specifically identify one single object or merely to identify the manufacturer of the product) .
  • the label should in many cases be resistant to removal from the object; it is for example desirable to label automobiles by another and more robust means than the serial number engraved in a part of the car, since such a serial number is fairly easy to remove or replace.
  • a specific label should preferably be difficult to copy by an infringing third-party, in order to prevent unlicensed copying of the object in question.
  • WO 90/14441 generally discloses the labelling and tracing of materials by use of nucleic acids.
  • the tracing is preferably performed by the aid of amplification of the nucleic acids used for labelling.
  • EP-B-408,424 discloses the marking of valuable objects by applying a solution of a target nucleic acid, the solution having a chosen fluidity, to the objects and subsequently identifying the object if this is necessary by detecting the target nucleic acid.
  • WO 91/17265 pertains to the tracing of liquid and solid materials, especially oil, after the materials have been labelled with DNA molecules.
  • WO 94/04918 pertains to the marking of liquids with ⁇ 1 ppm of particles comprising i . a . nucleic acid tags coupled there ⁇ to.
  • nucleic acids as the preferred type of molecules for labelling involves a number of advantages.
  • the labelling of products with nucleic acids involves the drawback of the need for a specific set of primers or hybridization probes in order to amplify and/or detect each specific label.
  • problems are encountered by the local authorities when attempting to establish e.g whether the object is stolen or whether it is at all labelled.
  • the present inventor has conceived a novel labelling scheme which combines the use of at least two sets of chemical tags comprising information which is contained in a chemical substance which can be subjected to molecular amplification.
  • the present invention relates to a method for the chemical labelling of an object, the method comprising adding, to the object, at least two chemical tags, a first and a second,
  • the first tag comprising an informational content 1) which is not divulged to the public, 2) which can be amplified by use of molecular amplifica ion, and 3) the presence of which specifically establishes the identity and/or origin of the object,
  • the second tag comprising an informational content 1) the presence of which indicates that the object is labelled with the first substance, and 2) which is easily detect ⁇ able.
  • first chemical tag (or just “first tag”) is herein meant a substance or composition which comprises a part (carrying the informational content) which can be amplified by means of molecular amplification.
  • exemplary are compositions or substances comprising nucleic acid fragments which carry information and which can be amplified by e.g. PCR or other molecular amplification methods known in the art.
  • second chemical tag is meant a substance or composition, the presence of which can be established without the need of expert knowledge or laboratory equipment and which further is used as an indicator of the presence of a first chemical tag.
  • Part of the first and second chemical tags may be a carrier or solid support such as latex beads, dextran or magnetic beads, polymeric substances or lipophilic compositions encap ⁇ sulating the information bearing component.
  • the labels according to the pre ⁇ sent invention are normally in the form of two different chemical tags, one first and one second. It is, however, sometimes desirable to include more than one first chemical tag and/or more than one second chemical tag, since it then becomes possible to label the object with codes of varying or equal levels of security. It will for example be possible to label an object with several specifically identifying first chemical tags of different composition. Thereby, the task for a potential infringer can be made unsurmountable, since he will not know how many first tags to identify and copy before his infringing product will comprise a label identical to that of the first object.
  • informational content is herein meant to indicate a set of features of the structures of the chemical tag which can be interpreted as a message (typically the first chemical tag) or as an indication (typically the second tag) .
  • Exem ⁇ plary is a chemical tag which comprises a nucleotide sequence which, when decoded, will provide a set of informations, preferably in the form of an alphanumeric code.
  • Information bearing component is the part of the chemical tag which can be directly decoded in order to obtain the informational content, for example one or more nucleic acid fragments forming part of the chemical tag.
  • the information bearing component may comprise the total chemical tag (e.g. when the tag is in the form of one single free nucleic acid fragment) or it may form a part of the chemical tag to which it is optionally covalently or non- covalently bound.
  • the information bearing component may comprise several separate molecular entities, e.g. seve- ral nucleic acid fragments, which together can be decoded to reveal the informational content.
  • object is in the present specification and claims meant non-living materials or substances as well as biological and living material.
  • object is simply that it is possible to provide the object with a label according to the present invention.
  • the term "adding to the object” means that the chemical tags are introduced on or in the object.
  • the chemical tags can be suspended in the object, covalently or non-covalently bound to the object or to subunits of the object, applied as a film or a spray on the object, etc, depending of the nature and structure of the object to be labelled.
  • molecular amplification is herein meant any amplification method which is capable of providing a large number of identical copies of a specific molecular entity from a single or only a few original copies of said specific molecular entity.
  • molecular amplification method is the polymerase chain reaction (PCR) which is disclosed in detail in EP-B-200,362, EP-B-201,184, EP-A-258,017, EP-A-502,588, EP-A-502,589, EP-A-505,012, EP-A-509,612.
  • PCR polymerase chain reaction
  • the polymerase used according to these disclosures, the Tag polymerase may of course be exchanged by commercially available thermostable polymerases such as Vent ® and AmpliTaq ® .
  • the expression “specifically establishing identity and/or origin” is meant that the informational content of the chosen first chemical tag differs sufficiently from that of other known chemical tags of the same nature in order for a posi ⁇ tive identification of the object to be performed. This has two practical implications: 1) The first chemical tag should be constructed in such a way that the probability of finding an identical chemical tag in a different object or group of objects is close to zero, and 2) if the first chemical tag is comprised of a molecule type which could theoretically be isolated from natural sources, it is necessary that the exact composition of the first chemical tag is such that the pro- bability of finding the same molecule in nature is also close to zero.
  • the first chemical tag will always be accompanied by the second chemical tag in an object labelled according to the present invention, the combined finding of these at least two tags in the same object will contribute to the minimization of the risk of finding the same label in another object or group of objects.
  • the first chemical tag is a DNA fragment of random sequence. If such a DNA fragment has a length of at least 30 nucleic acid residues, the probability of finding an iden ⁇ tical consecutive stretch of nucleic acid residues in nature would be acceptably low. Any other first chemical tag exhibi ⁇ ting a similar or lower probability of "natural reproduction" will of course also be acceptable.
  • a nucleotide sequence utilised as the information bearing component will comprise at least 50 nucleotides, and more often at least 75 nucleotides. It is preferred that such a nucleic acid fragment will comprise at least a 100, such as at least 150, nucleotides.
  • the presence of the informational content of the second chemical tag can be demonstrated by relatively simple means which do not require the presence of laboratory equipment or any expert skill of the person performing the demonstration.
  • the detection of the second chemical tag and its informational content can be provided by use of a simple test which can be performed "in the field” by a person unskilled in chemistry, physics, biochemistry, molecular biology etc.
  • the invention also pertains to objects which contain such labelling which can be provided by the labelling method of the invention.
  • the invention also relates to an object comprising a chemical label which contains
  • a first chemical tag comprising an informational content 1) which is not divulged to the public, 2) which can be amplified by use of molecular amplification, and 3) the presence of which specifically establishes the identity and/or origin of the object,
  • a second tag comprising an informational content 1) the presence of which indicates that the object is labelled with the first substance, and 2) which is easily detect- able.
  • the invention relates to a method for the determina ⁇ tion of the identity and/or origin of an object, the method comprising subjecting an object (which is labelled by the method of the invention or is an object of the invention) to a determination which involves the steps of
  • Figs, la and lb shows one preferred way of identifying the information bearing component of a first (or optionally a second) chemical tag.
  • Fig. 1A schematically depicts a DNA template and four PCR primers covering the total length of the template, as well as the total outcome of the possible PCR reactions involving the template and the primers.
  • Fig. IB shows schematically the outcome of a gel electropho- resis performed on the amplification products.
  • the informational content of the first chemical tag should according to the invention not be divulged to the public. This means that the exact nature of the information bearing component will not be known to the public. On the other hand, it is necessary that the manufacturer or owner of the object can demonstrate the informational content of the first chemi ⁇ cal tag in a plausible manner, in order for the informational content to be effective as legal proof.
  • the legal person responsible for the labelling of the object deposits the following at a nation ⁇ ally or internationally accepted deposition institution: l) The exact informational content, 2) an indication of the code used to prepare the information bearing component, 3) and a sample or precise description of the information bearing component and optionally of the total first chemical tag.
  • the deposited matter will be assigned a deposition number and a date of deposit, and at a later date the deposited matter can be extracted upon request from the depositor.
  • the specificity of the inform ⁇ ational content of the first label will depend on the speci- fie scenario wherein the label is used.
  • the label will normally specify precisely both the identity of the object and its origin, i . e. the informational content of the first tag is assigned specifi ⁇ cally to one single object.
  • the informational content is assigned specifically to a group of objects, namely all the objects produced by a certain manu ⁇ facturer.
  • the informational content of the information bearing component in the first tag is in the form of an alphanumeric code; this is especially interesting when using a linear molecule such as a nucleic acid as the information bearing component in the first and/or second chemical tag.
  • an alphanumeric code can be envis ⁇ aged in an infinite number of ways.
  • alphanumeric code is herein meant the direct coupling between specific molecular configurations (e.g. nucleotide sequences) and alphanumeric characters.
  • specific molecular configurations e.g. nucleotide sequences
  • alphanumeric codes based on nucleotide sequences is discussed:
  • the "code unit” is the number of nucleotides which forms one single character in a chosen alphanumeric nucleotide code, i . e . in a chosen alphanumeric code, two occurrences of the same code unit will (if they are in the same reading frame) indicate the same alphanumeric character.
  • reading frame is in this context meant a con- secutive stretch of nucleotide sequences each having the length of one code unit.
  • two code units are in the same reading frame when they make up two such nucleotide sequences in a reading frame.
  • the possible number of different characters in such an alphanumeric code depends on two numbers, namely the number of different nucleotides used in the nucleic acid fragment (usually 4) and the number of nucleotides used to form each character. More specifically, the maximum number of charac ⁇ ters in the alphanumeric code will vary according to the formula I:
  • N is the number of characters in the chosen code
  • Z is the number of different nucleotides used in the nucleic acid fragment
  • n is the number of nucleotides forming each character.
  • the number of alphanumeric characters in the code will be at most 64 when using triplets of nucleotides for each character, but 256 when using quadruplets for each character; in other words, an alphanumeric code based on 4 nucleotides and a code unit of 4 nucleotides can carry one byte of information.
  • the blank fields in the above table can e.g. be filled out with characters in order to ensure an equal balancing of the occurrence of all possible triplets (the characters "E” and "S” could e.g. be coded by more than one triplet in order to compensate for the high frequency of these letters in the british language) .
  • the main candidates for molecules which are susceptible to molecular amplification are nucleic acids, and it is thus preferred that the first tag (and optionally the second tag) comprises a nucleic acid fragment, such as a DNA or RNA fragment. As discussed herein, this allows for the coding of the label in terms of a message which is embedded in the sequence of the nucleic acid fragment. Depending on the coding matrix chosen, the code can involve an indefinite number of characters.
  • nucleotide sequence carry ⁇ ing a code will exclusively contain the four ribonucleotides A, G, C, and U (in the case of RNA) or the four deoxyribonu- cleotides dA, dG, dC, and T (in the case of DNA) , but in order to either 1) increase the number of characters in the code without extending the length of the code unit, 2) to alter the solubility of the nucleic acid fragment, or 3) to protect the nucleic acid fragment against enzymatic degrad- ation, nucleotides different from A, dA, G, dG, C, dC, U, and T may be used; these different nucleotides may be used as substitutes for the naturally occurring bases.
  • modified, non-naturally occurring or rare nucleotides also involves the advantage that breaking of the code (by sequen- cing) becomes increasingly difficult for an infringing third- party.
  • modified nucleotides to be used in the chemical tags of the invention are selected from the group consisting of
  • Non-alphanumeric code assigns a non-alphanumeric code to a chemical tag used in the invention.
  • the require ⁇ ments for such a code will be identical to that of an alphanumeric, i.e. it must specifically and/or unambiguously identify the object and/or its origin.
  • the number of degrees of freedom increases when a non-alphanumeric code is used, since every unique chemical tag may be assigned a code which can have any possible length. It is however preferred to use the alphanumeric coding system of the first tag for the reasons set forth above.
  • nucleic acid fragments are produced by conventional automated nucleotide synthesis (since their sequence can be precisely predetermined) , but the fragments may also be produced biologically and isolated from such sources.
  • the stability of the labelling substances may be of lesser or greater concern.
  • Labels which are to be used in objects which are made of materials which are likely to be recycled should preferably be produced so as to be destroyed when going through the recycling process.
  • RNA as part of the first chemical tag, since this molecule is highly susceptible to environmentally abundant R ⁇ ases. The requirement would then be that the R ⁇ A containing tag is protected from exposure to R ⁇ ase when in use, e.g. by means of encapsulation (for example in polymers or in micelles) , methylation of the nucleotides, formulation of the R ⁇ A frag ⁇ ments together with stabilising aliphatic proteins, provision of double stranded R ⁇ A fragments etc.
  • the label should be constructed in such a way that the first and second tags are highly resistant to degra ⁇ dation, e.g. chemical or enzymatic degradation. This can be achieved by methylation of ribonucleotides/deoxyribonucleo- tides, encapsulation (for example in polymers or in micelles) , stabilising of the nucleic acids by formulation together with aliphatic proteins, use of double stranded nucleic acid fragments, etc, or combinations thereof.
  • degra ⁇ dation e.g. chemical or enzymatic degradation.
  • This can be achieved by methylation of ribonucleotides/deoxyribonucleo- tides, encapsulation (for example in polymers or in micelles) , stabilising of the nucleic acids by formulation together with aliphatic proteins, use of double stranded nucleic acid fragments, etc, or combinations thereof.
  • the first chemical tag is formulated in such a way that it is compatible with the labelled object or comprises a moiety which ensures compatibility with the object.
  • This can be achieved in a number of ways; normally the problem will be that of ensuring an adequate solubility of the tag in a non- aqueous liquid.
  • the above-mentioned moiety of the tag can be covalently or non-covalently attached to the remainder of the tag and the moiety can then in itself be compatible with the object or be coupled to a third substance which is compatible with the object.
  • the tags can be formulated together with a micelle forming substance or a detergent, thereby enhancing solubility in the object or in the formulation applied on the object.
  • nucleic acids as the information bearing component in the first (and optionally in the second) chemi ⁇ cal tag, it will normally be of minor importance how the tag is formulated since the very low concentrations of the nucleic acids will not reveal their presence, regardless of whether they are soluble or not in the medium where they are suspended.
  • the question of formulation is of importance, namely when the tags are added to oils or petrochemical products which are liable to get in continuous contact with large quantities of aqueous material (e.g. labels present in crude oil which has leaked from a oil transport at sea) which could potentially wash the tags out of the product.
  • aqueous material e.g. labels present in crude oil which has leaked from a oil transport at sea
  • nucleic acids are formulated in order for them to favour solubilisation in hydrocarbons instead of an aqueous phase so as to prevent wash-out of the hydrocarbon phase of the nucleic acid.
  • nucleic acid may be methylated
  • the nucleotides could be coupled to biotin or hydrophobic haptens such as fluorescein, dinitrophenol and tri-iodothyronine, or sulphonucleotides containing thiophos- phates could be used and incorporated in the nucleic acid and subsequently derivatized with thiol-specific modifying agents such as iodoethanol.
  • the nucleic acids may be covalently linked to hydrophobic beads (e.g. magnetic) designed to be soluble in hydrocarbons and not in an aqueous phase.
  • the second chemical tag should satisfy the same general criteria as the first chemical tag, i . e . it should exhibit a stability similar to that of the first chemical tag, so as to ensure that the labelled object will preserve the informational content of both tags to substantially the same degree.
  • the second chemical tag is easily detectable, meaning that it does not require expert skill or laboratory conditions to detect the second chemical tag.
  • the second chemical tag should preferably be present in the object in such a low concentration or amount that the presence of the second chemical tag does not interfere with the features of the object itself.
  • the second chemical tag can be selected from the group consisting of a nucleotide fragment, a rare metal, a sub ⁇ stance capable of forming micelles, a stain (optionally a fluorescent dye) , a specific binding partner such as an antigen capable of binding to an antibody coupled to a marker designed for easy detection, an antibody capable of binding to an antigen coupled to a marker designed for easy detec ⁇ tion, and an enzyme capable of catalyzing an easily detect ⁇ able chemical reaction.
  • the second chemical tag comprises an informational content which can be amplified by means of molecular amplification (cf. the discussion below pertaining to the detection of the labelled objects of the invention) , because this allows for the use of only trace amounts of the second chemical tag thereby keeping down costs for the labelling procedure and avoiding interference with the features of the labelled object.
  • each and every aspect of the invention which pertains to amplifiable first chemical tags of the invention pertains mutatis mutandis to the second chemical tags of the invention when the informational content of these can be amplified by means of molecular amplification.
  • the informational content of the second chemical tag may be in the form of an alphanumeric code, and it may be detectable as a result of the molecular amplification or of a combina ⁇ tion of the molecular amplification and sequence analysis, etc.
  • the labelling method according to the present invention is suit ⁇ able for the labelling of a non-living article, product or composition.
  • the pro- blems relating to formulation of the chemical tags are rela ⁇ tively easily solved (cf. however the above discussion of oils and petrochemical products) , simply because the chemical tag may be added in such a low concentration that it solu ⁇ bility in the formulation is normally of minor importance.
  • the non-living article, product or composition can therefore be any product or artifact it is desired to label, since the label may be introduced so as to form part of the object but also as a simple external marking, cf. for example the dis ⁇ closure in EP-B-408,424 which relates to the labelling of valuable objects with nucleic acids.
  • the non-living materials or substances include an industrial product, a work of art, an antiquity, an environmental pollu ⁇ tant, air pollutants, oils and petrochemical products, aro ⁇ matic and aliphatic compounds, explosives, foods and feeds, medicaments, inks, paper goods including securities such as bank notes and bonds.
  • the labelling according to the present invention is introduced as DNA or RNA (dependent on the type of organism or virus) in the genome or (less preferred due to the possible loss/dissemination of the label) in a plasmid of the living organism and in such a way that the label is passed on to the offspring of the first generation of labelled organisms (i.e. in higher organisms the label should be introduced in the germ cells) .
  • the introduction of the labels can be performed according to standard methods in the field of genetic en ⁇ gineering which are well known to the skilled person, cf. e.g. Sambrook J, Fritsch E F, and Maniatis T (1989) , Molecu ⁇ lar Cloning: A Laboratory Manual, 2nd ed.
  • the introduction of the label in the virus or organism must, however, be performed so as to avoid any substantial interference with the phenotype, i.e. the introduction of the label should not lead to any altering in the expression pattern normally exhibited by the living organism.
  • the labelled living organism may be one indi ⁇ vidual being which is very valuable (a racing animal such as a horse or a breeding animal) .
  • the label should not be introduced into the germ line cells, but rather into a chosen subset of somatic cells which can be tested later on.
  • the label can also be intro ⁇ quizzed in the form of a physiologically acceptable implant (e.g. a PVC implant) .
  • the labelled organism is selected from the group consisting of a prokaryotic organism which can be a bacterium, a blue green algae, or an intracellular parasite such as a mycoplasma; an eukaryotic organism selected from the group consisting of a yeast, a fungus, a protozoa, an algae, and a multicellular plant or animal; and cells/tissues derived from a multicellular plant or animal. Detection of the informational content in labelled objects according to the invention
  • the detection of the second chemical tag should, according to the invention be the first step in the total detection pro- cedure.
  • the means and measures for detection of the second chemical tag (especially its informational content) will of course vary according to the nature of the second chemical tag, but the detection procedures are well-known in the art.
  • the detection system involves binding of the ligand to a specific binding partner (e.g. an antibody reacting with the antigen and vice versa; in such cases the detection system could be any immunological assay such as an RIA [radio immune assay] , an EIA [enzymatic immune assay] such as an ELISA etc) .
  • the detection can involve spectroscopy (e.g. flame spectroscopy) .
  • the detection phase could involve the demonstration of catalyzation of the perti ⁇ nent reaction by the enzyme, etc.
  • the informational content of the first (and optionally of the second) tag is detectable as a result of the molecular amplification or of a combination of the molecular amplification and sequence analysis.
  • This has the advantage that the label can be present in the object in such small concentrations that it will be virtually, if not totally, impossible to detect the presence of the label by any other means than the use of a method involving the mole- cular amplification.
  • the second chemical tag may also share the feature of the first chemical tag that the informational content can be amplified by use of molecular amplification.
  • the second chemical tag should be easy to amplify for the relevant authority, i.e. the primers necessary for a positive demon ⁇ stration of the presence of the informational content of the second tag should be available to the relevant authority, optionally also to the public. This can be accomplished by establishing a set of standards (or even one unique standard) which are nationally or internationally recognized as indica ⁇ tors of the presence of a second chemical tag.
  • a stan- dard could e.g. be a DNA fragment of approximately 100 nucleotide residues which is used for all products labelled according to the invention.
  • nucleic acid fragment acting as the information bearing component in a first or a second chemical tag has been rendered lipophilic (as dis ⁇ cussed above in the section pertaining to formulation of the tags) it will be necessary to transfer the tag to an aqueous environment in order to complete a molecular amplification reaction and a subsequent label determination.
  • Methods for achieving this goal is i . a . discussed in detail in WO 91/17265.
  • the determination of the informational content of the first tag can be accomplished only after the provision of the relevant amplification primers and optionally of relevant sequencing primers.
  • the set of amplification primers relating to the information bearing component of the first chemical tag is constructed in such a way that they together cover the complete sequence of the information bearing compo ⁇ nent (cf. Fig. l).
  • Fig la. is shown the relationship between the four primers PI (20 nucleotides) , P2 (29 nucleo ⁇ tides) , P3 (20 nucleotides) and P4 (30 nucleotides) and a template DNA fragment (forming the information bearing compo ⁇ nent) of 99 nucleotides.
  • the possible PCR reactions involving the use of the four primers will result in four different PCR fragments of 99, 79, 69 and 49 nucleotides, respectively (cf. Fig.
  • first and second chemical tags will be in the form of at least two separate chemical entities (i.e. in the form of at least two different and separate molecules) but in certain embodiments they may be part of the same chemical entity, e.g. of the same molecule.
  • This embodiment of the invention is especially interesting when the second tag is in the form of nucleotide fragments which flank the nucleotide fragment comprised in the first tag, since nucleotide stretches of the second tag may 1) serve as templates for primers in the amplification reaction amplifying the informational content of the first chemical tag and 2) serve as templates for primers in a possible subsequent sequencing reaction.
  • the parts of the template strand which is complementary to the primers could be made of PNA (protein nucleic acids, cf. Nielsen P. E. et al., 1991, Science 254, pp. 1497-1500, which is coupled to either RNA or DNA which makes up the rest of the template strand.
  • PNA protein nucleic acids
  • the label may according to this aspect of the invention contain at least one first tag which is subject to modification and/or loss of at least a part of its informational content as a consequence of its exposure to a physical or chemical condition. It is for example possible to construct labels containing a predetermined concentration of first tags. Samples of such labels are then subjected to well-defined exposures of the relevant physical or chemical condition. From these exposure experiments it is possible to establish a correlation between a) the (relative) amount of remaining first label which can be amplified and b) the exposure of the physical or chemical condition.
  • This "assay" can be enhanced by using more than one first tag, e.g. nucleic acid fragments of different length or structure, whereby it is achieved that more than one correlation is performed.
  • the specific physical conditions may be radiation or high temperature and the chemical condition may be treatment with denaturing agents or enzymes. Therefore, by use of the inven ⁇ tion it will be possible to establish whether e.g. a sterilisation procedure has been effective or whether objects have been subjected to an undesired exposure of e.g. radia ⁇ tion; in both cases the absence or significantly decreased concentration of the label will indicate that the exposure has occurred, and the degree of exposure can also be deter ⁇ mined from the correlation.
  • a chemical tag generally denotes oligonucleotides, preferably DNA-oligonucleotides produced by conventional automated DNA chemosynthesis.
  • the sequence of the chemical tag is defined according to a prede ⁇ fined matrix, cf. the above discussion and tables 1A and IB, allowing a pertinent and user-chosen alpha-numeric message to be introduced.
  • the size of the oligonucleotides can vary substantially, but is normally around 100 nucleotides.
  • chemical tags comprising DNA are exem ⁇ plified, but it will be understood that the invention is in no way confined to this embodiment, cf. the above discussion of the nature of the first and second chemical tag.
  • the method for demonstration of DNA tags in objects is the polymerase chain reaction (PCR) , or any biochemically related enzymatic method for the amplification of nucleo ⁇ tides.
  • PCR polymerase chain reaction
  • Detection and deciphering of the encoded message is carried out via the use of a suitable number of PCR cycles and reagents.
  • the following outline conditions are used: 0.3 ⁇ M of each primer, 1.5 u Taq pol, 1,5 mM MgC12, 0,2 mM dNTP in 0,050 ml reaction volume.
  • PCR Denaturation at about 94°C for 1 min., annealing at the relevant annealing temperature (ranging from 45-70°C, but typically 58°C for l min if nothing else is mentioned) , extension at about 72°C for l min. The result is thereafter visualized by gel electrophoresis, staining of DNA with ethidiumbromide and photography using 301 n UV light.
  • PCR and DNA sequence analysis are carried out to read the alphanumeric information of the tag; the sequence analysis may be performed according to the well-known dideoxy chain termination method of Sanger et al .
  • the method of the invention offers an invisible, nontoxic, safe chemical first tag which may (when labelling germ cells) or may not (when labelling somatic cells) be transmitted to the next generation and which can be displayed as ID alpha- numerical characters by means of a laboratory analysis.
  • the direct display of an owners chosen ID information is of utmost importance as evidence before e.g. a court or a jury.
  • a non-trans- mittable alpha-numeric ID-tag (which do not have any biologi ⁇ cal activity) would make it possible to unambiguously iden ⁇ tify one single individual horse.
  • animals include: Artificially Inseminated bulls (Al bulls) , valuable pet animals (dogs, cats) , experi- mental animal individuals (including transgenic mouse strains) and any other animal it would be of interest to unambiguously identify for fiscal, environmental or other reasons.
  • the DNA tags are introduced into the animal genome by DNA containing functional genes which can, when injected into muscle tissue, be expressed in a transient fashion (only for a limited period of time) . This situation does, as opposed to the general methods of genetic engineering of the animal germ line, not result in a DNA tag which is transmitted to future generations. Only somatic cells are treated, either via injection or with a biolistic approach (gene gun) ; suitable vectors include a viral carrier using CAT plasmids (Gorman C. M. et al . , 1982, Mol. Cell. Biol. 2, 1044, and Edlund T. et al . , 1985, Science 230, 912) or poly(dl-dC) :poly(dl-dC) as used by Singh et al . (Singh H. et al., 1986, Nature 319,
  • somatic cells In order to obtain a stable chemical tag according to the invention, the somatic cells must integrate the DNA tag into their chromosomes.
  • a recently described method for facilitated transport of DNA into the nuclei of the recipient cells Alestr ⁇ m et al. 1995, Transgenic Research, in press) will enhance the efficiency of the method of labelling of somatic cells according to the invention.
  • the detection is performed by use of a 30 cycle PCR as out ⁇ lined above.
  • the DNA tags are introduced into the genome by general methods of genetic engineering (cf. Sambrook J, Fritsch E F, and Maniatis T (1989) , Molecular Cloning: A Laboratory Man ⁇ ual, 2nd ed., Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y.) and will be integrated into the chromosomes of the animal germ line in order to, as a minor addition to the genome (preferably having no biological activity) , be trans- mitted to all future generations.
  • animals include: Al bulls, valuable pet animals (dogs, cats), experimental animal strains (including transgenic mouse strains) and any other animal it would be of interest to unambiguously identify for fiscal, environmental or other reasons.
  • the detection is performed by use of a 30 cycle PCR as out- lined above.
  • Microorganisms in food industries belong to a large group of valuable microbe strains with unique traits being more or less well-defined genetically. Illicit use of such microor- ganisms is at present difficult to control and prevent.
  • lactic acid and propionic acid bacterial strains which provides the Norwegian Jarlsberg cheese with its typical flavour. These bacterial strains are not covered by intellectual property rights and can thus easily be mis- used by third-parties. A genetically transmitted alphanumeric ID-tag (which do not affect or impair with the traits of the bacterium) would make it possible to show whether competitors are using the specific Jarlsberg strains.
  • the DNA tags are introduced into the bacterial genome by means of well-known general methods of genetic engineering (Sambrook J, Fritsch E F, and Maniatis T (1989) , Molecular Cloning: A Laboratory Manual, 2nd ed., Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y.) and will be integrated into the chromosome of the microorganism in order to, as a minor addition to the genome (which do not have any biologi ⁇ cal activity and do not affect or impair the genetic traits of the bacterium), be transmitted to all future generations.
  • the detection is performed by use of a 30 cycle PCR as out ⁇ lined above.
  • the method of the invention offers an invisible, nontoxic, safe chemical label which is displayed as ID alpha-numerical characters by means of a laboratory analysis.
  • ID information will be of greatest importance as proof in for example a court or a jury.
  • the scale of synthesis of suitable DNA labels is at present adapted for analytical purposes, but can easily be scaled up for certain applications.
  • the size of the oligonucleotides are typically around 100 nucleotide residues, but can vary substantially in some cases.
  • the "small" scale (0.2 ⁇ mol) synthesis gives typically approximately 10 17 molecules (or 30,000 pmoles of oligonucleotide) at a commercial prize of approximately 300 USD. With 10 17 molecules, 10 9 - 10 11 m 3 can be labelled with 1-100 labels per ml.
  • the group of potential environmental pollutants include oil, pesticides, waste chemicals, etc., of which all are chemicals transported in large quantities and which on occasion are illegally or accidentally dumped in the natural ecosystems.
  • the DNA tags are added to the liquid to a final concentration of a minimum of one molecule per millilitre (2 x 10 "9 pM or higher) .
  • DNA is not necessarily soluble in all such potential pollutants. This means that the oligonucleotides will make up a dispersion of precipitated DNA rather than DNA in solution, cf. the discussion in the perfume example below. This may, however, be an advantage, since the DNA molecules will be chemically very stable in such a situation. Further, it is not expected that single molecules will sediment over a realistic time-span, but rather stay evenly distributed in the labelled liquid. 33
  • the labelled sample (A) was evaporated in a fume hood.
  • Samples (B) and (C) were extracted with 10 mM Tris buffer pH 8 in the presence of 1 ⁇ g carrier tRNA, followed by ethanol precipitation, centrifugation at 12000 x g for 10 min at +4°C and drying of the pellet.
  • the dried down non-visible DNAs of (A) , (B) and (C) were dissolved in 30 ⁇ l distilled water. Detection and deciphering of the encoded message was carried out via 35 cycles of PCR (0.3 ⁇ M of each primer, 1.5 u Taq pol, 1,5 mM MgC12, 0,2 mM dNTP in 0,050 ml reaction volume.
  • PCR Denaturation at 94°C for 1 min., annealing at 62°C for 1 min, extension at 72°C for 1 min) . The result was visualized by gel electrophoresis, staining of DNA with ethidiumbromide and photography in 301 nm UV light and a red filter.
  • This group of products belongs to a large group of exclusive high cost products which are illegally copied and manufac ⁇ tured as being the original.
  • the DNA tags are added the liquid to a final concentration of a minimum of one molecule per millilitre (2 X 10 "9 pM or higher) .
  • DNA is not soluble when the alcohol content is around 70% or more. This means the oligonucleotides will make up a dispersion of precipitated DNA rather than DNA in so- lution, which is an advantage rather than an disadvantage, since the DNA molecules will be chemically very stable in such a situation. Further, it is not expected that single molecules will sediment over a realistic time-span, but rather stay evenly distributed in the labelled liquid.
  • the method for demonstration of the highly diluted liquid of DNA tags is polymerase chain reaction (PCR) , or any biochemically related enzymatic method.
  • PCR polymerase chain reaction
  • a combination of PCR and DNA sequence analysis is carried out to read the alpha-numeric information of the tag.
  • Detection and deciphering of the encoded message was carried out via a 30 cycles of PCR (0.3 ⁇ M of each primer, 1.5 u Taq pol, 1,5 mM MgC12, 0,2 mM dNTP in 0,050 ml reaction volume.
  • PCR Denaturation at 94°C for 1 min., annealing at 58°C for 1 min, extension at 72°C for 1 min) .
  • the result was visualized by gel electrophoresis, staining of DNA with ethidiumbromide and photography in 301 nm UV light.
  • This section pertains to labelling which can be used by individuals in order to put their personal label on valuable belongings like antiques, jewellery, furniture, cars, bicycles, cameras, computers etc.
  • the DNA tags are added to a final concentration of 1,000 - 1,000,000,000 molecules per microliter (2 x 10 "3 pM 2,000 pM) to the ink liquid used in permanent pens. DNA is not soluble when the alcohol content is around 70% or more, cf. the above comments.
  • Detection and deciphering of the encoded message is carried out via a 30-40 cycles of PCR (0.3 ⁇ M of each primer, 1.5 u Taq pol, 1,5 mM MgC12, 0,2 mM dNTP in 0,050 ml reaction volume.
  • PCR Denaturation at 94°C for 1 min., annealing at annealing temperature for 1 min, extension at 72°C for 1 min) .
  • the result is visualized by gel electrophoresis, stain ⁇ ing of DNA with ethidiumbromide and photography in 301 nm UV light and red filter.
  • the result is detection and characterization of the DNA tag with respect to sequence content and its alphanumeric message with the aid of a PCR reaction.
  • the complete analysis has a duration of approximately 3 hours.
  • Plastic products is a large group of plastic products pro- tected by intellectual property rights.
  • illegal copies represents a huge economical loss for the companies producing the original product.
  • DNA tags also can be added on the package, cover or bar codes etc. of the toys.
  • Sampling from strategies (A) and (B) involves graining a piece of the toy to a fine powder which is dispersed in a 10 mM Tris buffer pH 8 for dissolving some of the DNA tags.
  • Sampling from strategies (C) is in the simplest situation washing the toy with a small volume of 10 mM Tris buffer pH 8 for dissolving some of the DNA tags, or if necessary, to follow a similar procedure as for (A) and (B) .
  • Detection and deciphering of the encoded message is carried out by 35 cycles of PCR (Example: 0.3 ⁇ M of each primer, 1.5 u Taq pol, 1,5 mM MgC12, 0,2 mM dNTP in 0,050 ml reaction volume.
  • the tag may be added to the products either as one single marker for each individual product and/or in the from of a number of patches, each representing a manufacturers general ID with an added number of one or more digits.
  • a serial number that may or may not be identical to the serial number of the pertinent product may be positioned in one or more places on the product. Since the numbers cannot be read by any third-party, they are virtually impossible to forge.
  • DNA tag 20 pmol of DNA tag is added to 1 ml of transparent solvent which is subsequently added to the marking paint or dye.
  • the labelled dye or part is applied to an already painted surface in the order of a serial number.
  • the reading of the label is performed by carefully scratching the labelled area with a suitable tool.
  • the sample is lyophilized in 1.5 ml microfuge tubes and the scraped materia is introduced in 30 ⁇ l of distilled water in order to dis- solve DNA tags. Detection and deciphering of the encoded message is carried out via 30-40 cycles of PCR (0.3 ⁇ M of each primer, 1.5 u Taq pol, 1,5 mM MgC12, 0,2 mM dNTP in 0,050 ml reaction volume.
  • the result is detection and characterization of the DNA tag with respect to sequence content and its alphanumeric message with the aid of a PCR reaction.
  • the duration of the complete analysis should be about 3 hours.
  • Any product which receives an original coating of paint, dye, varnish etc, may be uniquely labelled according to the inven- tion by incorporating a chemical tag in the paint. Because of the trace amounts of the chemical tag it will not have any detectable influence on the colour or lustre of the pain . Further, any trace of the paint will in the future carry the label.
  • Theft of military equipment from military deposits is a quite common problem in i.a. the Scandinavian countries and often the stolen goods appear on the illegal market or in connec ⁇ tion with other criminal activity. In such cases it is often hard, if not impossible, to trace the origin of the equip ⁇ ment, since all visible or readily available markings, serial numbers etc. have been removed or altered in an attempt to provide the equipment with a new or obscure identity.
  • the invisible marking according to the present invention provides an effective and simple alternative to the identification means already existing. Further, the general knowledge that a high-security labelling system of military equipment exists will probably in itself be an effective bar against theft from military storages, as the risk of being caught will increase.
  • the method of the present invention offers the possibility of incorporating a chemical label in the paper or alternatively in the ink. Since it is possible to incorporate more than one high-security tag in e.g. a bank note it will be possible to incorporate different tags, each carrying different informa ⁇ tion (nominal value of the bank note, batch number etc.) .
  • the label according to the present invention may be incorporated in the bar-code printing ink.
  • microprocessors and RAM-circuits in general known as chips
  • the value of such circuitry is by weight higher than that of gold, and the chips reappear in new electronic devices (com ⁇ puters, printers etc.) emerging from a multitude of small illicit manufacturers of electronic equipment. Labelling of chips (e.g. by spraying) according to the invention should enhance the possibilities of a successive outcome of the criminal investigation in such cases.
  • counterfeit parts for aircrafts is a great safety hazard. Since such parts may be prepared from the same materials as the original parts it can be difficult, if not impossible to identify them. For example, insufficiencies of counterfeit parts of metals or alloys are in many cases caused by incorrect heat treatment resulting in inadequate strength and/or resilience.
  • the existence of an invisible label on original parts would increase the awareness of the airlines when they are offered spare parts at a low cost. Further, demonstration of the use of counterfeit parts in an airplane will render possible crippling litigation after an aircraft accident. In other words, the use of an invisible label according to the invention would lead to an increased security in airway travelling and transportation, simply because of the economical implications of neglecting the warranted use of original spare parts.
  • the present invention offers the possibility of specific labelling works of art or other unique objects.
  • the inventive labelling can be used in this connection in a number of different scenarios:
  • Contemporary artists can authenticate their own works of art by applying an invisible label.
  • the label can e.g. be incorporated in paint or in the canvas (if the work of art is a painting) or in any other suitable material forming part of the work of art.
  • the precise nature of the label can be deposited in an institution which can (at any point in future) test whether a given work of art is in fact authentic.
  • a typical technique would be to spray a DNA tag onto a limited (but undisclosed) part of the labelled object. Later sampling would encompass washing the object with a small volume of 10 mM Tris buffer pH 8 in order to dis ⁇ solve a portion of the DNA applied. Detection an de ⁇ ciphering: 35 cycles of PCR (Example: 0.3 ⁇ M of each primer, 1.5 u Taq pol, 1,5 mM MgC12, 0,2 mM dNTP in 0,050 ml reaction volume. Denaturation at 94°C for 1 min., annealing at 62°C for 1 min, extension at 72°C for 1 min) . The result is visualized by gel electrophoresis, staining of DNA with ethidiumbromide and photography in 301 nm UV light and a red filter.

Abstract

L'invention concerne un procédé de marquage d'objets tels que des produits industriels, des ÷uvres d'art, des antiquités, des titres, et des polluants environnementaux ainsi que de matériaux biologiques tels que des organismes vivants et des virus. Le procédé consiste à ajouter au moins deux étiquettes chimiques à l'objet. Les informations intégrées dans la première étiquette ne sont pas divulguées, et présentent un contenu informatif qui peut être amplifié au moyen de l'amplification moléculaire (PCR) et qui donne spécifiquement l'identité et/ou l'origine de l'objet. La seconde étiquette indique la présence de la première étiquette et est facilement détectable. L'invention porte également sur les objets marqués et sur un procédé de détermination de leur identité et/ou de leur origine. Les étiquettes ont, de préférence, un contenu informatif qui se présente sous forme d'un code alphanumérique et sont des fragments d'acide nucléique tels que de l'ADN ou de l'ARN.
PCT/IB1995/001144 1994-12-08 1995-12-08 Marquage chimique d'objets WO1996017954A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU39923/95A AU701932B2 (en) 1994-12-08 1995-12-08 Chemical labelling of objects
NZ296197A NZ296197A (en) 1994-12-08 1995-12-08 Chemical labelling of objects or material; at least two chemical tags added, first not divulged to public, second indicates presence of first
EP95938583A EP0795029A1 (fr) 1994-12-08 1995-12-08 Marcage chimique d'objets
NO972610A NO972610L (no) 1994-12-08 1997-06-06 Kjemisk merking av objekter

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NO944739A NO944739D0 (no) 1994-12-08 1994-12-08 Metode for kjemisk merking og identifisering
NO944740 1994-12-08
NO944739 1994-12-08
NO944740A NO944740D0 (no) 1994-12-08 1994-12-08 Metode for å merke og identifisere organismer og organisk materiale

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WO1996017954A1 true WO1996017954A1 (fr) 1996-06-13

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AU (1) AU701932B2 (fr)
CA (1) CA2206486A1 (fr)
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WO (1) WO1996017954A1 (fr)

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NZ296197A (en) 1999-11-29
AU3992395A (en) 1996-06-26

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