EP1108065A1 - Methode zur bestimmung der fähigkeit eines patienten ein bestimmtes medikament zu metabolisieren - Google Patents

Methode zur bestimmung der fähigkeit eines patienten ein bestimmtes medikament zu metabolisieren

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Publication number
EP1108065A1
EP1108065A1 EP99946509A EP99946509A EP1108065A1 EP 1108065 A1 EP1108065 A1 EP 1108065A1 EP 99946509 A EP99946509 A EP 99946509A EP 99946509 A EP99946509 A EP 99946509A EP 1108065 A1 EP1108065 A1 EP 1108065A1
Authority
EP
European Patent Office
Prior art keywords
sequence
point mutation
detection primer
subsequence
primer
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP99946509A
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English (en)
French (fr)
Inventor
Dan Hauzenberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cepheid AB
Original Assignee
Sangtec Molecular Diagnostics AB
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Filing date
Publication date
Application filed by Sangtec Molecular Diagnostics AB filed Critical Sangtec Molecular Diagnostics AB
Publication of EP1108065A1 publication Critical patent/EP1108065A1/de
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/0004—Oxidoreductases (1.)
    • C12N9/0071—Oxidoreductases (1.) acting on paired donors with incorporation of molecular oxygen (1.14)
    • C12N9/0077—Oxidoreductases (1.) acting on paired donors with incorporation of molecular oxygen (1.14) with a reduced iron-sulfur protein as one donor (1.14.15)
    • 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
    • C12Q1/6844—Nucleic acid amplification reactions
    • C12Q1/6858—Allele-specific amplification
    • 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
    • C12Q2531/00—Reactions of nucleic acids characterised by
    • C12Q2531/10—Reactions of nucleic acids characterised by the purpose being amplify/increase the copy number of target nucleic acid
    • C12Q2531/113—PCR
    • 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
    • C12Q2563/00—Nucleic acid detection characterized by the use of physical, structural and functional properties
    • C12Q2563/131—Nucleic acid detection characterized by the use of physical, structural and functional properties the label being a member of a cognate binding pair, i.e. extends to antibodies, haptens, avidin

Definitions

  • the present application relates to an assay method for monitoring metabolism of certain drugs in an individual. More particularly, the invention relates to a method for determining the presence of point mutations in isoforms of cytochrome P450, which point mutations are known to affect the isoforms' abilities to metabolise said drugs. The invention also relates to primers and diagnostic kits that are suitable for carrying out the invention.
  • Single nucleotide variations have been estimated to occur in a frequency of approximately one out of thousand nucleotides in the human genome (Cooper et al., J. Hum. Genet. (1985) 69:201). Many of these mutations may not give rise to a phenotype but a great number of the genetic diseases known to date are caused by single nucleotide polymorphisms. As a consequence, detection of single nucleotide mutations in specific genes will become of increasing interest in order to understand the ethiology of many genetic diseases.
  • Phase I Drug metabolism involves enzymes that either oxidise (phase I) or conjugate (phase II) xenobiotics.
  • phase II conjugate
  • cytochrome P450 which are located in the endoplasmatic reticulum primarily in the liver (Under et al., Clinical Chemistry (1997) 43:254).
  • Cytochromes P450 are comprised by a super gene family of mixed function oxidases that metabolises a large number of xenobiotics including drugs. Thirty or more of these enzymes have been characterised in the human so far, each with distinct catalytic specificity and unique regulation.
  • the most important isoforms involved in drug metabolism are CYP2D6, CYP2C9, CYP2C19 and CYP3A4.
  • CYP isoforms are known to be polymorphic which results in differential capacities in metabolising drugs such as omeprazole (proton pump inhibitors), phenytoin (anti-convulsant), verapamil (calcium-antagonists), propanolol (beta-blockers) and many others.
  • the C YP2C9 isoform is involved in hydroxylation of tolbutamide, phenytoin and S-warfarin among others.
  • CYP2C9 converts S-warfarin into the inactive phenolic metabolite S-7-hyckoxywarfarin and thereby controls the pharmacological activity of this drug.
  • polymorphisms among these enzymes exist resulting in differential capacities to metabolise drugs.
  • the genetic basis of this polymorphism is single nucleotide mutations resulting in the expression of two allelic variants, CYP2C9*2 and CYP2C9*3.
  • the CYP2C9*2 allele has cysteine substituted for arginine at amino acid 144 in the protein and CYP2C9*3 has leucine substituted for isoleucine at position 359.
  • CYP2C9*3 possesses only 5% of the catalytic capacity for S-warfarin as compared to the CYP2C9 wild type enzyme.
  • Warfarin is a widely used anticoagulant of coumarin type which acts by blocking synthesis of the vitamin K-dependant coagulation factors II, VII, IX and X in the liver.
  • the indications for taking S-warfarin are all diseases where prevention of extensive blood clotting is a crucial factor in the efficient treatment of patients. Examples of such *-»
  • diseases are acute embolic diseases of heart, lung or brain. In these cases the treatment is often combined with heparine. More specific indications are diseases where a lifelong treatment with anti-coagulants is required. Such diseases include recurrent venous thrombosis, pulmonary embolism and chronic atrial fibrillations.
  • diseases include recurrent venous thrombosis, pulmonary embolism and chronic atrial fibrillations.
  • the major difficulties with the use of this drug are a broad range of interactions with other drugs as well as nutritional factors. The complicated treatment of patients with this drug carries the risk of serious hemorrhage in as much as 9 % per patient year (Fihn et al, Ann. Intern. Med. (1996) 124:970; Steward et al., Pharmacogenetics (1997) 7:361).
  • C YP2C9 metabolises the transformation of the anti-convulsant Valproic acid ( VD A) into the unsaturated metabolite 4-ENE-VPA.
  • VD A anti-convulsant Valproic acid
  • 4_ENE-NPA acts hepatotoxic and causes several deaths yearly in the US (Sadeque et al., J. Pharmacol. Exp. Ther. (1997) 283:698).
  • the CYP2C19 isoform is involved in 4-hydroxylation (or 5-hydroxylation) of tricyclic antidepressants such as irnipramin, anti-malarial prodrags as for instance proguanil and proton pump inhibitors such as omeprazole or pentaprazole (Linder et al., Clinical Chemistry (1997) 43:254).
  • This subfamily is polymorphogenic due to single nucleotide mutations (S ⁇ P) of the wild type allele.
  • the Ml allele contains a G 68 6-A 686 substitution which creates a novel aberrantly spliced CYP2C19 mR ⁇ A. This results in the production of an inactivated truncated protein.
  • the M2 allele contains a G 64 ⁇ -A 64I substitution resulting in a premature stop codon. Therefore, these two alleles represent poor metabolise phenotypes.
  • S ⁇ P single-point mutations
  • Detection of single-point mutations can be performed using different techniques.
  • such assays can be subdivided into techniques where detection of S ⁇ P:s involves electrophoretic separation of DNA sequences and techniques using solid supports.
  • Techniques using solid supports have several advantages as compared to electrophoretic separation techniques. Firstly, the solid-phase assays involve relatively few and simple manipulations that are amenable to full automation. Secondly, non-radioactive methods can conveniently be used in the solid phase assays and thirdly, these assays give numerical results allowing e.g. statistical treatment.
  • a method comprising the steps of a) isolating and/or providing detectable amounts of single-stranded DNA from said sample by using known methods; b) hybridising the single-stranded DNA obtained in step a) with a detection primer comprising a plurality of nucleotide residues, said primer being complementary to a target nucleotide sequence immediately adjacent and 5' in relation to a defined point mutation of a single-stranded DNA encoding a cytochrome P450 isoform, where said point mutation is known to affect said isoform' s ability to metabolise said drug, such that there are no nucleotide residues between the defined point mutation and the 3 ' end of the detection primer that are identical to the first or second nucleotide residues of the point mutation to be detected, when the detection primer is hybridised to the target nucleic acid; c) extending the
  • the solid phase mini-sequencing technique disclosed in WO91/13075 provides a cheap and robust assay which can be performed by any laboratory equipped with a thermal cycler. Moreover, this technique does not require any specially trained personnel. Furthermore, the solid phase mini-sequencing technique does not require radioactively labeled nucleotides. Therefor it exhibits higher safety standards than such techniques.
  • this technique provides an excellent possibility of detecting either homozygote or heterozygote alleles within a defined sample.
  • the present invention relates to a method for determining the ability of cells in a sample to metabolise a certain drug comprising detecting a defined point mutation of a single-stranded DNA encoding a cytochrome P450 isoform, where said point mutation is known to affect said isoform' s ability to metabolise said drug.
  • the present invention relates to detection primers useful in the above mentioned method, which primers hybridise to target nucleotide sequences immediately adjacent and 5' in relation to a point mutation of a DNA, said DNA encoding an isoform of cytochrome P450.
  • the present invention relates to a diagnostic kit for carrying out said method, said kit comprising at least one detection primer as defined above, at least two amplification primers derived from a sequence encoding a cytochrome P450 isoform , said amplification primers being chosen in such a way that a subsequence of said cytochrome P450-encoding sequence to which said detection primer hybridises is amplified, and a DNA-polymerising agent.
  • drug relates to drugs that are metabolised by cytochrome P450 isoforms.
  • examples of such drugs are omeprazole , pentaprazole, phenytoin, verapamil, propanolol, tolbutamide, S-warfarin, tricyclic antidepressants such as imipramin and anti-malarial prodrags such as proguanil.
  • detection primer relates to an oligonucleotide which hybridises to a site immediately adjacent 5' in relation to a defined point mutation.
  • amplification primer relates to one of two primers forming a primer pair that is used according to well-known amplification procedures such as PCR. Both detection primers and amplification primers according to the invention comprises 8 - 70 nucleotides, preferably 10-30 nucleotides, and most preferably 15 - 25 nucleotides.
  • affinity pair relates to a pair of chemical, preferably biochemical, compounds that binds specifically and strongly to each other.
  • examples of such pairs include, but are not limited to antibody-antigen, biotin-avidin/streptavidin, enzyme-substrate, a pair of complementary oligonucleotides, protein A-IgG, etc.
  • the term "polymerising agent” relates to a DNA polymerising agent.
  • An example of such an gent is the Klenow fragment of Escherichia coli DNA polymerase I, but any DNA polymerase can be used in the method of this invention.
  • the presence of point mutations can be detected by adding labelled nucleotides to the detection primer.
  • Any kind of detectable labels such as one member of an affinity pair, radioactive nuclides, fluorescent compounds, enzymes inducing light emissions or colour changes etc. can be bound to an ordinary nuclotide in order to obtain a labelled nucleotide.
  • it is possible to use modified nucleotides such as chain-terminating dideoxynucleotides.
  • the skilled person is well aware of how to choose suitable labelled nucleotides as well as how to choose suitable detection procedures when carrying out the method according to the present invention.
  • fig. 1 discloses a photo of an electrophoresis gel where lanes A-E represent the following PCR products: A: CYP2C9*2 (simplex PCR), B: CYP2C9*3 (simplex PCR), C: CYP2C9*2*3 (20 ⁇ l*3, multiplex PCR), D: CYP2C9*2*3 (15 ⁇ l * 3, multiplex PCR), E: CYP2C9*2*3 (10 ⁇ * 3, multiplex PCR).
  • A-E represent the following PCR products: A: CYP2C9*2 (simplex PCR), B: CYP2C9*3 (simplex PCR), C: CYP2C9*2*3 (20 ⁇ l*3, multiplex PCR), D: CYP2C9*2*3 (15 ⁇ l * 3, multiplex PCR), E: CYP2C9*2*3 (10 ⁇ * 3, multiplex PCR).
  • A-E represent the following
  • table 1 discloses results obtained when the PCR products shown in fig. 1 have been subjected to minisequencing reactions. Both specific and non-specific sequence primers as well as complimentary or non-complimentary nucleotides have been used.
  • the figures shown in table 1 represent optical density (OD) values from an ELISA determined at 405 nm.
  • the table shows which PCR products were coated onto the streptavidin-coated ELISA plate (columns), which sequence primers were used (rows) and which nucleotides were used in the sequencing reaction (columns);
  • table 2 shows the calculated ratio of the OD at 405 nm from nucleotides incorporated by the mini-sequencing reaction.
  • the ratio values presented in this table have been calculated from the OD values in table 1.
  • the ratio was calculated as follows: complementary nucleotide (OD at 405 nm/ complementary nucleotide + non- complementary nucleotide (OD at 405 nm).
  • a ratio of > 0.85 is significant for an incorporation of complementary nucleotides when using homozygous alleles.
  • the mini-sequencing technique is based on amplification of defined genes with PCR (Polymerase Chain Reaction) using biotinylated or otherwise conjugated oligonucleotides (primers). In general, where possible a multiplex amplification procedure is utilised.
  • the biotinylated PCR products are immobilised on streptavidin- coated microwell plates and the PCR products are sequenced using an allele-specific oligonucleotide.
  • Possible mutations within the immobilised PCR product representing a defined allele are detected by incorporation of a mutation-specific labelled nucleotide.
  • Incorporatio of a complementary nucleotide can be detected either directly or indirectly utilising various established detection methods. Using this technique, it is possible to detect homozygote or heterozygote alleles based on single nucleotide mutations within an individual.
  • Genomic DNA can be prepared using any established method described in the literature (PCR Protocols, Innis MA et al., Academic Press 1990; PCR, a practical approach, McPherson, MJ et al., Oxford University Press, 1991) or using any DNA purification kit present.
  • the DNA prepared in these experiments has been prepared using the QIAamp Blood Kit (Qiagen Inc, USA) according to the description provided by the manufacturer.
  • Genomic DNA can be prepared using any sample-containing nucleated cells.
  • the typical yield using the above mentioned DNA purification kit is 10 ng/ ⁇ l. 250 ng of purified genomic DNA was used as a template in the subsequent PCR.
  • the primers used for the PCR reactions are described in the sequence listing as SEQ.ID.Nos 4, 5, 7, 8, 10, 11, 13 and 14.
  • a 2x mastemix for the multiplex PCR of CYP2C9 alleles was prepared as follows: • Tris-HCl (100 mM, pH8.8)
  • PCR reaction 50 ⁇ l of the above described 2x mastermix was subject to a PCR tube (thin wall PCR tubes, Perkin-Ehner Inc. USA). 24,5 ⁇ l of ddH20, 0,5 ⁇ l Taq- polymerase (2,5 Units, Perkin-Elmer, Inc, USA) and 25 ⁇ l geonomic DNA (250 ng) was added to the tube and the reaction mix was overlaid with 50 ⁇ l mineral oil.
  • the thermal conditions for amplification of the CYP2C9 alleles were as follows: An initial denaturation step at 96°C for 2 minutes thereafter 96°C (30 sec), 60°C (30 sec) (58°C for the CYP2C19 alleles) and 72°C (30 sec), 35 cycles. Following the PCR amplification, 100 ⁇ l of the amplified sample was mixed with 400 ⁇ l of Binding buffer (buffer 1) containing 20 mM sodium phosphate, pH 7.5, 100 mM NaCl and 0.1 % (v/v) Tween-20.
  • Buffer 1 Binding buffer
  • MWP microwell plates
  • the MWP were then incubated at 22°C for 15 minutes.
  • the immobilized PCR samples were denatured using a denaturing solution containing NaOH (50 mM) for 1 minute at 22°C.
  • the MWP were washed using a buffer (buffer 2) containing Tris-HCl (40 mM, pH 8.8), EDTA (lmM), NaCl (50 mM) and Tween-20 (0.1%).
  • minisequencing reaction every well of the MWP was incubated with an appropriate minisequencing primer (final concentration 0.1 ⁇ M) diluted in 5 ⁇ l of 10 x DNA polymerase buffer (buffer 3) containing Tris-HCl (500 mM, pH 8.8), (NH 4 ) 2 S0 4 (150 mM), MgCl 2 (15mM), Triton X-100 (1% V/V), Gelatin (0.1%W/V), DNA polymerase (0.1 units), flourescein-12-dNTP complementary to the nucleotide to be detected (final concentration of 0.1 ⁇ M) and ddH 2 0 to a final volume of 50 ⁇ l.
  • buffer 3 DNA polymerase buffer
  • Tris-HCl 500 mM, pH 8.8
  • NH 4 ) 2 S0 4 150 mM
  • MgCl 2 15mM
  • Triton X-100 1% V/V
  • Gelatin 0.1%W/V
  • DNA polymerase
  • the MWP were incubated at 55° C for 30 minutes. Following the minisequencing reaction the MWP were washed using buffer 2. Incorporated nucleotides were detected using alkaline phosphatase (AP) conjugated anti-FITC monoclonal antibodies (0.75 U/ml) diluted in a buffer (buffer 4) containing : Hepes (25 mM), NaCl (125 mM), MgCl 2 (2 mM), BSA (1%) and Tween-20 (0.3 % N/V). Incubation was done at 22° C for 15 minutes and the plates were subsequently washed using buffer 2.
  • AP alkaline phosphatase
  • Buffer 4 buffer containing : Hepes (25 mM), NaCl (125 mM), MgCl 2 (2 mM), BSA (1%) and Tween-20 (0.3 % N/V). Incubation was done at 22° C for 15 minutes and the plates were subsequently washed using buffer 2.
  • Detection of bound monoclonal antibodies was performed by incubation the MWP using a detection buffer (buffer 5) containing diethanolamine (10.6 % W/V), MgCl 2 (0.05 % W/V) and para- nitro-phenyl phosphate (4 mg/ml) for 20 minutes at 22° C. Detection of incorporated d ⁇ TP's was done at 405 nm using a commercially available spectrophotometer.
  • PCR amplification and minisequencing has been performed using CYP2C9 and CYP2C19 specific primers. The results shown below demonstiate amplification and minisequencing of the CYP2C9 alleles.
  • Human genomic D ⁇ A was purified as described in the method section. 250 ng of genomic D ⁇ A was subjected to PCR as described above. The results of a representative experiment are demonstrated in figure 1. Next a minsequencing reaction of the amplified DNA was done as decribed above. By using alleles specific sequencing primers incorporated dNTP's could be detected in subsequent detection steps as described above. These results are shown in table 1.

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EP99946509A 1998-08-28 1999-08-25 Methode zur bestimmung der fähigkeit eines patienten ein bestimmtes medikament zu metabolisieren Ceased EP1108065A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9802897 1998-08-28
SE9802897 1998-08-28
PCT/SE1999/001449 WO2000012757A1 (en) 1998-08-28 1999-08-25 A method for measuring a patient's ability to metabolise certain drugs

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EP1108065A1 true EP1108065A1 (de) 2001-06-20

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EP (1) EP1108065A1 (de)
JP (1) JP2002523111A (de)
AU (1) AU5890899A (de)
WO (1) WO2000012757A1 (de)

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
GB0021286D0 (en) * 2000-08-30 2000-10-18 Gemini Genomics Ab Identification of drug metabolic capacity
DE10237691B4 (de) * 2002-08-15 2010-01-28 Biotez Berlin-Buch Gmbh Biochemisch-Technologisches Zentrum Verfahren zum Nachweis von Einzelnukleotid-Polymorphismen (SNP) in Genen des Arzneimittelmetabolismus und Testkit zur Durchführung des Verfahrens
EP1561823A1 (de) * 2004-02-04 2005-08-10 Biotez Berlin-Buch GmbH Verfahren zum Nachweis von Einzelnukleotid-polymorphismen (SNP) in Genen des Arzneimittelmetabolismus und Testkit zur Durchführung des Verfahrens
CA2571817A1 (en) * 2004-06-30 2006-01-12 Tm Bioscience Pgx, Inc. Method of detecting mutations in the gene encoding cytochrome p450-2c9
US20080248466A1 (en) * 2004-07-30 2008-10-09 Tm Bioscience Pgx Inc. Method Of Detecting Mutations In The Gene Encoding Cytochrome P450-2C19
GR1005451B (el) * 2005-09-20 2007-02-21 Medicon Hellas A.E. Μεθοδος εντοπισμου διαφορων ενος νουκλεοτιδιου σεμια αλληλουχια νουκλεοτιδιων με τη χρηση ξηρων/λυοφιλοποιημενων αντιδραστηριων
CN102277424A (zh) * 2006-11-30 2011-12-14 爱科来株式会社 Cyp2c19基因扩增用引物对、含有其的cyp2c19基因扩增用试剂及其用途
US20100047800A1 (en) * 2007-01-22 2010-02-25 Siemens Healthcare Diagnostics Inc. Reagents and Methods for Detecting CYP2C9 Polymorphisms

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WO1995034679A2 (en) * 1994-06-16 1995-12-21 The Government Of The United States Of America, Represented By The Secretary, Department Of Health And Human Services Defects in drug metabolism
JPH1014585A (ja) * 1996-07-05 1998-01-20 S R L:Kk 新規オリゴヌクレオチドプライマー及びそれを用いたヒトチトクロームｐ４５０ ２ｃ１９ 遺伝子のエクソン４中の点突然変異の検査方法

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DE MORAIS ET AL, MOLECULAR PHARMACOLOGY, vol. 46, no. 4, 1994, pages 594 - 598 *
DE MORAIS ET AL, THE JOURNAL OF BIOLOGICAL CHEMISTRY, vol. 269, no. 22, 1994, pages 15419 - 15422 *
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AU5890899A (en) 2000-03-21
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