US20030175696A1 - Method for rapid detection and identification of bioagents - Google Patents

Method for rapid detection and identification of bioagents Download PDF

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US20030175696A1
US20030175696A1 US10/319,290 US31929002A US2003175696A1 US 20030175696 A1 US20030175696 A1 US 20030175696A1 US 31929002 A US31929002 A US 31929002A US 2003175696 A1 US2003175696 A1 US 2003175696A1
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nucleic acid
base
bioagent
mass
amplification product
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David Ecker
Richard Griffey
Rangarajan Sampath
Steven Hofstadler
John McNeil
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Ibis Biosciences Inc
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Isis Pharmaceuticals Inc
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    • 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
    • C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
    • C12Q1/6888—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms
    • C12Q1/689—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms for bacteria
    • 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
    • C12Q1/686—Polymerase chain reaction [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
    • C12Q2600/00—Oligonucleotides characterized by their use
    • C12Q2600/156—Polymorphic or mutational markers

Definitions

  • the present invention relates to methods for rapid detection and identification of bioagents from environmental, clinical or other samples.
  • the methods provide for detection and characterization of a unique base composition signature (BCS) from any bioagent, including bacteria and viruses.
  • BCS base composition signature
  • the unique BCS is used to rapidly identify the bioagent.
  • PCR polymerase chain reaction
  • detection and data analysis convert the hybridization event into an analytical result.
  • Mass spectrometry provides detailed information about the molecules being analyzed, including high mass accuracy. It is also a process that can be easily automated.
  • high-resolution MS alone fails to perform against unknown or bioengineered agents, or in environments where there is a high background level of bioagents (“cluttered” background).
  • Low-resolution MS can fail to detect some known agents, if their spectral lines are sufficiently weak or sufficiently close to those from other living organisms in the sample.
  • DNA chips with specific probes can only determine the presence or absence of specifically anticipated organisms. Because there are hundreds of thousands of species of benign bacteria, some very similar in sequence to threat organisms, even arrays with 10,000 probes lack the breadth needed to detect a particular organism.
  • Antibodies face more severe diversity limitations than arrays. If antibodies are designed against highly conserved targets to increase diversity, the false alarm problem will dominate, again because threat organisms are very similar to benign ones. Antibodies are only capable of detecting known agents in relatively uncluttered environments.
  • Electrospray ionization-Fourier transform-ion cyclotron resistance (ESI-FT-ICR) MS may be used to determine the mass of double-stranded, 500 base-pair PCR products via the average molecular mass (Hurst et al., Rapid Commun. Mass Spec . 10:377-382, 1996).
  • MALDI-TOF matrix-assisted laser desorption ionization-time of flight
  • U.S. Pat. No. 5,849,492 describes a method for retrieval of phylogenetically informative DNA sequences which comprise searching for a highly divergent segment, of genomic DNA surrounded by two highly conserved segments, designing the universal primers for PCR amplification of the highly divergent region, amplifying the genomic DNA by PCR technique using universal primers, and then sequencing the gene to determine the identity of the organism.
  • U.S. Pat. No. 5,965,363 discloses methods for screening nucleic acids for polymorphisms by analyzing amplified target nucleic acids using mass spectrometric techniques and to procedures for improving mass resolution and mass accuracy of these methods.
  • WO 99/14375 describes methods, PCR primers and kits for use in analyzing preselected DNA tandem nucleotide repeat alleles by mass spectrometry.
  • WO 98/12355 discloses methods of determining the mass of a target nucleic acid by mass spectrometric analysis, by cleaving the target nucleic acid to reduce its length, making the target single-stranded and using MS to determine the mass of the single-stranded shortened target. Also disclosed are methods of preparing a double-stranded target nucleic acid for MS analysis comprising amplification of the target nucleic acid, binding one of the strands to a solid support, releasing the second strand and then releasing the first strand which is then analyzed by MS. Kits for target nucleic acid preparation are also provided.
  • PCT WO97/33000 discloses methods for detecting mutations in a target nucleic acid by nonrandomly fragmenting the target into a set of single-stranded nonrandom length fragments and determining their masses by MS.
  • U.S. Pat. No. 5,605,798 describes a fast and highly accurate mass spectrometer-based process for detecting the presence of a particular nucleic acid in a biological sample for diagnostic purposes.
  • WO 98/21066 describes processes for determining the sequence of a particular target nucleic acid by mass spectrometry.
  • Processes for detecting a target nucleic acid present in a biological sample by PCR amplification and mass spectrometry detection are disclosed, as are methods for detecting a target nucleic acid in a sample by amplifying the target with primers that contain restriction sites and tags, extending and cleaving the amplified nucleic acid, and detecting the presence of extended product, wherein the presence of a DNA fragment of a mass different from wild-type is indicative of a mutation.
  • Methods of sequencing a nucleic acid via mass spectrometry methods are also described.
  • WO 97/37041, WO 99/31278 and U.S. Pat. No. 5,547,835 describe methods of sequencing nucleic acids using mass spectrometry.
  • U.S. Pat. Nos. 5,622,824, 5,872,003 and 5,691,141 describe methods, systems and kits for exonuclease-mediated mass spectrometric sequencing.
  • One embodiment of the present invention is a method of identifying an unknown bioagent comprising (a) contacting nucleic acid from the bioagent with at least one pair of oligonucleotide primers which hybridize to sequences of the nucleic acid and flank a variable nucleic acid sequence; (b) amplifying the variable nucleic acid sequence to produce an amplification product; (c) determining the molecular mass of the amplification product; and (d) comparing the molecular mass to one or more molecular masses of amplification products obtained by performing steps (a)-(c) on a plurality of known organisms, wherein a match identifies the unknown bioagent.
  • the sequences to which the at least one pair of oligonucleotide primers hybridize are highly conserved.
  • the amplifying step comprises polymerase chain reaction.
  • the amplifying step comprises ligase chain reaction or strand displacement amplification.
  • the bioagent is a bacterium, virus, cell or spore.
  • the nucleic acid is ribosomal RNA.
  • the nucleic acid encodes RNase P or an RNA-dependent RNA polymerase.
  • the amplification product is ionized prior to molecular mass determination.
  • the method may further comprise the step of isolating nucleic acid from the bioagent prior to contacting the nucleic acid with the at least one pair of oligonucleotide primers.
  • the method may further comprise the step of performing steps (a)-(d) using a different oligonucleotide primer pair and comparing the results to one or more molecular mass amplification products obtained by performing steps (a)-(c) on a different plurality of known organisms from those in step (d).
  • the one or more molecular mass is contained in a database of molecular masses.
  • the amplification product is ionized by electrospray ionization, matrix-assisted laser desorption or fast atom bombardment.
  • the molecular mass is determined by mass spectrometry.
  • the mass spectrometry is Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), ion trap, quadrupole, magnetic sector, time of flight (TOF), Q-TOF or triple quadrupole.
  • the method may further comprise performing step (b) in the presence of an analog of adenine, thymidine, guanosine or cytidine having a different molecular weight than adenosine, thymidine, guanosine or cytidine.
  • the oligonucleotide primer comprises a base analog or substitute base at positions 1 and 2 of each triplet within the primer, wherein the base analog or substitute base binds with increased affinity to its complement compared-to the native base.
  • the primer comprises a universal base at position 3 of each triplet within the primer.
  • the base analog or substitute base may be 2,6-diaminopurine, propyne T, propyne G, phenoxazines or G-clamp.
  • the universal base is inosine, guanidine, uridine, 5-nitroindole, 3-nitropyrrole, dP or dK, or 1-(2-deoxy- ⁇ -D-ribofuranosyl)-imidazole-4-carboxamide.
  • Another embodiment of the present invention is a method of identifying an unknown bioagent comprising (a) contacting nucleic acid from the bioagent with at least one pair of oligonucleotide primers which hybridize to sequences of the nucleic acid and flank a variable nucleic acid sequence; (b) amplifying the variable nucleic acid sequence to produce an amplification product; (c) determining the base composition of the amplification product; and (d) comparing the base composition to one or more base compositions of amplification products obtained by performing steps (a)-(c) on a plurality of known organisms, wherein a match identifies the unknown bioagent.
  • the sequences to which the at least one pair of oligonucleotide primers hybridize are highly conserved.
  • the amplifying step comprises polymerase chain reaction.
  • the amplifying step comprises ligase chain reaction or strand displacement amplification.
  • the bioagent is a bacterium, virus, cell or spore.
  • the nucleic acid is ribosomal RNA.
  • the nucleic acid encodes RNase P or an RNA-dependent RNA polymerase.
  • the amplification product is ionized prior to molecular mass determination.
  • the method may further comprise the step of isolating nucleic acid from the bioagent prior to contacting the nucleic acid with the at least one pair of oligonucleotide primers.
  • the method may further comprise the step of performing steps (a)-(d) using a different oligonucleotide primer pair and comparing the results to one or more base composition signatures of amplification products obtained by performing steps (a)-(c) on a different plurality of known organisms from those in step (d).
  • the one or more base compositions is contained in a database of base compositions.
  • the amplification product is ionized by electrospray ionization, matrix-assisted laser desorption or fast atom bombardment.
  • the molecular mass is determined by mass spectrometry.
  • the mass spectrometry is Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), ion trap, quadrupole, magnetic sector, time of flight (TOF), Q-TOF or triple quadrupole.
  • the method may further comprise performing step (b) in the presence of an analog of adenine, thymidine, guanosine or cytidine having a different molecular weight than adenosine, thymidine, guanosine or cytidine.
  • the oligonucleotide primer comprises a base analog or substitute base at positions 1 and 2 of each triplet within the primer, wherein the base analog or substitute base, binds with increased affinity to its complement compared to the native base.
  • the primer comprises a universal base at position 3 of each triplet within the primer.
  • the base analog or substitute base may be 2,6-diaminopurine, propyne T, propyne G, phenoxazines or G-clamp.
  • the universal base is inosine, guanidine, uridine, 5-nitroindole, 3-nitropyrrole, dP or dK, or 1-(2-deoxy- ⁇ -D-ribofuranosyl)-imidazole-4-carboxamide.
  • the present invention also provides a method for detecting a single nucleotide polymorphism in an individual, comprising the steps of (a) isolating nucleic acid from the individual; (b) contacting the nucleic acid with oligonucleotide primers which hybridize to regions of the nucleic acid which flank a region comprising the potential polymorphism; (c) amplifying the region to produce an amplification product; (d) determining the molecular mass of the amplification product; and (e) comparing the molecular mass to the molecular mass of the region in an individual known to have the polymorphism, wherein if the molecular masses are the same then the individual has the polymorphism.
  • the primers hybridize to highly conserved sequences.
  • the polymorphism is associated with a disease.
  • the polymorphism is a blood group antigen.
  • the amplifying step is polymerase chain reaction.
  • the amplification step is ligase chain reaction or strand displacement amplification.
  • the amplification product is ionized prior to mass determination.
  • the amplification product is ionized by electrospray ionization, matrix-assisted laser desorption or fast atom bombardment.
  • the molecular mass is determined by mass spectrometry.
  • the mass spectrometry is Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), ion trap, quadrupole, magnetic sector, time of flight (TOF), Q-TOF or triple quadrupole.
  • FT-ICR-MS Fourier transform ion cyclotron resonance mass spectrometry
  • ion trap ion trap
  • quadrupole quadrupole
  • magnetic sector magnetic sector
  • TOF time of flight
  • Q-TOF Q-TOF or triple quadrupole.
  • FIGS. 1 A- 1 I are consensus diagrams that show examples of conserved regions from 16S rRNA (FIG. 1A- 1 B), 23S rRNA (3′-half, FIG. 1C- 1 D; 5′-half, FIG. 1E-F), 23S rRNA Domain I (FIG. 1G), 23S rRNA Domain IV (FIG. 1H) and 16S rRNA Domain III (FIG. 1I) which are suitable for use in the present invention.
  • Lines with arrows are examples of regions to which intelligent primer pairs for PCR are designed. The label for each primer pair represents the starting and ending base number of the amplified region on the consensus diagram.
  • Bases in capital letters are greater than 95% conserved; bases in lower case letters are 90-95% conserved, filled circles are 80-90% conserved; and open circles are less than 80% conserved.
  • the label for each primer pair represents the starting and ending base number of the amplified region on the consensus diagram.
  • FIG. 2 shows a typical primer amplified region from the 16S rRNA Domain III shown in FIG. 1C.
  • FIG. 3 is a schematic diagram showing conserved regions in RNase P. Bases in capital letters are greater than 90% conserved; bases in lower case letters are 80-90% conserved; filled circles designate bases which are 70-80% conserved; and open circles designate bases that are less than 70% conserved.
  • FIG. 4 is a schematic diagram of base composition signature determination using nucleotide analog “tags” to determine base composition signatures.
  • FIG. 5 shows the deconvoluted mass spectra of a Bacillus anthracis region with and without the mass tag phosphorothioate A (A*).
  • the two spectra differ in that the measured molecular weight of the mass tag-containing sequence is greater than the unmodified sequence.
  • FIG. 6 shows base composition signature (BCS) spectra from PCR products from Staphylococcus aureus ( S. aureus 16S — 1337F) and Bacillus anthracus ( B. anthr . 16S — 1337F), amplified using the same primers.
  • the two strands differ by only two (AT-->CG) substitutions and are clearly distinguished on the basis of their BCS.
  • FIG. 7 shows that a single difference between two sequences (A 14 in B. anthracis vs. A 15 in B. cereus ) can be easily detected using ESI-TOF mass spectrometry.
  • FIG. 8 is an ESI-TOF of Bacillus anthracis spore coat protein sspE 56 mer plus calibrant. The signals unambiguously identify B. anthracis versus other Bacillus species.
  • FIG. 9 is an ESI-TOF of a B. anthracis synthetic 16S — 1228 duplex (reverse and forward strands). The technique easily distinguishes between the forward and reverse strands.
  • FIG. 10 is an ESI-FTICR-MS of a synthetic B. anthracis 16S — 1337 46 base pair duplex.
  • FIG. 11 is an ESI-TOF-MS of a 56 mer oligonucleotide (3 scans) from the B. anthracis saspB gene with an internal mass standard.
  • the internal mass standards are designated by asterisks.
  • FIG. 12 is an ESI-TOF-MS of an internal standard with 5 mM TBA-TFA buffer showing that charge stripping with tributylammonium trifluoroacetate reduces the most abundant charge state from [M ⁇ 8H + ] 8 ⁇ to [M ⁇ 3H + ] 3 ⁇ .
  • the present invention provides a combination of a non-PCR biomass detection mode, preferably high-resolution MS, with PCR-based BCS technology using “intelligent primers” which hybridize to conserved sequence regions of nucleic acids derived from a bioagent and which bracket variable sequence regions that uniquely identify the bioagent.
  • the high-resolution MS technique is used to determine the molecular mass and base composition signature (BCS) of the amplified sequence region.
  • This unique “base composition signature” (BCS) is then input to a maximum-likelihood detection algorithm for matching against a database of base composition signatures in the same amplified region.
  • the present method combines PCR-based amplification technology (which provides specificity) and a molecular mass detection mode (which provides speed and does not require nucleic acid sequencing of the amplified target sequence) for bioagent detection and identification.
  • the present method allows extremely rapid and accurate detection and identification of bioagents compared to existing methods.- Furthermore, this rapid detection and identification is possible even when sample material is impure. Thus, the method is useful in a wide variety of fields, including, but not limited to, environmental testing (e.g., detection and discrimination of pathogenic vs. non-pathogenic bacteria in water or other samples), germ warfare (allowing immediate identification of the bioagent and appropriate treatment), pharmacogenetic analysis and medical diagnosis (including cancer diagnosis based on mutations and polymorphisms; drug resistance and susceptibility testing; screening for and/or diagnosis of genetic diseases and conditions; and diagnosis of infectious diseases and conditions).
  • the method leverages ongoing biomedical research in virulence, pathogenicity, drug resistance and genome sequencing into a method which provides greatly improved sensitivity, specificity and reliability compared to existing methods, with lower rates of false positives.
  • the present method can be used to detect and classify any biological agent, including bacteria, viruses, fungi and toxins.
  • the information obtained is used to determine practical information needed for countermeasures, including toxin genes, pathogenicity islands and antibiotic resistance genes.
  • the methods can be used to identify natural or deliberate engineering events including chromosome fragment swapping, molecular breeding (gene shuffling) and emerging infectious diseases.
  • Bacteria have a common set of absolutely required genes. About 250 genes are present in all bacterial species ( Proc. Natl. Acad. Sci. U.S.A . 93:10268, 1996 ; Science 270:397, 1995), including tiny genomes like Mycoplasma, Ureaplasma and Rickettsia. These genes encode proteins involved in translation, replication, recombination and repair, transcription, nucleotide metabolism, amino acid metabolism, lipid metabolism, energy generation, uptake, secretion and the like.
  • Operons can also be targeted using the present method.
  • One example of an operon is the bfp operon from enteropathogenic E. coli .
  • Multiple core chromosomal genes can be used to classify bacteria at a genus or genus species level to determine if an organism has threat potential. The method can also be used to detect pathogenicity markers (plasmid or chromosomal) and antibiotic resistance genes to confirm the threat potential of an organism and to direct countermeasures.
  • a theoretically ideal bioagent detector would identify, quantify, and report the complete nucleic acid sequence of every bioagent that reached the sensor.
  • the complete sequence of the nucleic acid component of a pathogen would provide all relevant information about the threat, including its identity and the presence of drug-resistance or pathogenicity markers. This ideal has not yet been achieved.
  • the present invention provides a straightforward strategy for obtaining information with the same practical value using base composition signatures (BCS). While the base composition of a gene fragment is not as information-rich as the sequence itself, there is no need to analyze the complete sequence of the gene if the short analyte sequence fragment is properly chosen.
  • BCS base composition signatures
  • a database of reference sequences can be prepared in which each sequence is indexed to a unique base composition signature, so that the presence of the sequence can be inferred with accuracy from the presence of the signature.
  • base composition signatures are that they can be quantitatively measured in a massively parallel fashion using multiplex PCR (PCR in which two or more primer pairs amplify target sequences simultaneously) and mass spectrometry. These multiple primer amplified regions uniquely identify most threat and ubiquitous background bacteria and viruses. In addition, cluster-specific primer pairs distinguish important local clusters (e.g., anthracis group).
  • a “bioagent” is any organism, living or dead, or a nucleic acid derived from such an organism.
  • bioagents include but are not limited to cells (including but not limited to human clinical samples, bacterial cells and other pathogens) viruses, toxin genes and bioregulating compounds). Samples may be alive or dead or in a vegetative state (for example, vegetative bacteria or spores) and may be encapsulated or bioengineered.
  • a base composition signatures is the exact base composition from selected fragments of nucleic acid sequences that uniquely identifies the target gene and source organism. BCS can be thought of as unique indexes of specific genes.
  • intelligent primers are primers which bind to sequence regions which flank an intervening variable region.
  • these sequence regions which flank the variable region are highly conserved among different species of bioagent.
  • the sequence regions may be highly conserved among all Bacillus species.
  • highly conserved it is meant that the sequence regions exhibit between about 80-100%, more preferably between about 90-100% and most preferably between about 95-100% identity.
  • Examples of intelligent primers which amplify regions of the 16S and 23S rRNA are shown in Figures 1 A- 1 I.
  • a typical primer amplified region in 16S rRNA is shown in FIG. 2.
  • the arrows represent primers which bind to highly conserved regions which flank a variable region in 16S rRNA domain III.
  • the amplified region is the stem-loop structure under 1100-1188.
  • One main advantage of the detection methods of the present invention is that the primers need not be specific for a particular bacterial species, or even genus, such as Bacillus or Streptomyces. Instead, the primers recognize highly conserved regions across hundreds of bacterial species including, but not limited to, the species described herein. Thus, the same primer pair can be used to identify any desired bacterium because it will bind to the conserved regions which flank a variable region specific to a single species, or common to several bacterial species, allowing nucleic acid amplification of the intervening sequence and determination of its molecular weight and base composition.
  • primers used in the present method bind to one or more of these regions or portions thereof.
  • the present invention provides a combination of a non-PCR biomass detection mode, preferably high-resolution MS, with nucleic acid amplification-based BCS technology using “intelligent primers” which hybridize to conserved regions and which bracket variable regions that uniquely identify the bioagent(s).
  • a non-PCR biomass detection mode preferably high-resolution MS
  • nucleic acid amplification-based BCS technology using “intelligent primers” which hybridize to conserved regions and which bracket variable regions that uniquely identify the bioagent(s).
  • PCR ligase chain reaction
  • SDA strand displacement amplification
  • the high-resolution MS technique allows separation of bioagent spectral lines from background spectral lines in highly cluttered environments.
  • the resolved spectral lines are then translated to BCS which are input to a maximum-likelihood detection algorithm matched against spectra for one or more known BCS.
  • the bioagent BCS spectrum is matched against one or more databases of BCS from vast numbers of bioagents.
  • base composition signatures are quantitatively measured in a massively parallel fashion using the polymerase chain reaction (PCR), preferably multiplex PCR, and mass spectrometric (MS) methods. Sufficient quantities of nucleic acids must be present for detection of bioagents by MS. A wide variety of techniques for preparing large amounts of purified nucleic acids or fragments thereof are well known to those of skill in the art.
  • PCR requires one or more pairs of oligonucleotide primers which bind to regions which flank the target sequence(s) to be amplified. These primers prime synthesis of a different strand of DNA, with synthesis occurring in the direction of one primer towards the other primer.
  • the primers, DNA to be amplified, a thermostable DNA polymerase (e.g. Taq polymerase), the four deoxynucleotide triphosphates, and a buffer are combined to initiate DNA synthesis.
  • the solution is denatured by heating, then cooled to allow annealing of newly added primer, followed by another round of DNA synthesis. This process is typically repeated for about 30 cycles, resulting in amplification of the target sequence.
  • the “intelligent primers” define the target sequence region to be amplified and analyzed.
  • the target sequence is a ribosomal RNA (rRNA) gene sequence.
  • rRNA ribosomal RNA
  • rRNA genes Like many genes involved in core life functions, rRNA genes contain sequences that are extraordinarily conserved across bacterial domains interspersed with regions of high variability that are more specific to each species. The variable regions can be utilized to build a database of base composition signatures.
  • the strategy involves creating a structure-based alignment of sequences of the small (16S) and the large (23S) subunits of the rRNA genes. For example, there are currently over 13,000, sequences in the ribosomal RNA database that has been created and maintained by Robin Gutell, University of Texas at Austin, and is publicly available on the Institute for Cellular and Molecular Biology web page (http://www.rna.icmb.utexas.edu/). There is also a publicly available rRNA database created and maintained by the University of Antwerp, Belgium at http://www.rrna.uia.ac.be.
  • regions that are useful as base composition signatures have been analyzed to determine regions that are useful as base composition signatures.
  • the characteristics of such regions are: a) between about 80 and 100%, preferably>about 95% identity among species of the particular bioagent of interest, of upstream and downstream nucleotide sequences which serve as sequence amplification primer sites; b) an intervening variable region which exhibits no greater than about 5% identity among species; and c) a separation of between about 30 and 1000 nucleotides, preferably no more than about 50-250 nucleotides, and more preferably no more than about 60-100 nucleotides, between the conserved regions.
  • flanking rRNA primer sequences serve as good “universal” primer binding sites to amplify the region of interest for most, if not all, bacterial species.
  • the intervening region between the sets of primers varies in length and/or composition, and thus provides a unique base composition signature.
  • oligonucleotide primers can be designed such that the nucleotide corresponding to this position is a base which can bind to more than one nucleotide, referred to herein as a “universal base”.
  • inosine (I) binds to U, C or A; guanine (G) binds to U or C, and uridine (U) binds to U or C.
  • Other examples of universal bases include nitroindoles such as 5-nitroindole or 3-nitropyrrole (Loakes et al., Nucleosides and Nucleotides 14:1001-1003, 1995), the degenerate nucleotides dP or dK (Hill et al.), an acyclic nucleoside analog containing 5-nitroindazole (Van Aerschot et al., Nucleosides and Nucleotides 14:1053-1056, 1995) or the purine analog 1-(2-deoxy- ⁇ -D-ribofuranosyl)-imidazole-4-carboxamide (Sala et al., Nucl. Acids Res . 24:3302-3306, 1996).
  • the oligonucleotide primers are designed such that the first and second positions of each triplet are occupied by nucleotide analogs which bind with greater affinity than the unmodified nucleotide.
  • nucleotide analogs which bind with greater affinity than the unmodified nucleotide. Examples of these analogs are 2,6-diaminopurine which binds to thymine, propyne T which binds to adenine and propyne C and phenoxazines, including G-clamp, which binds to G.
  • Propynes are described in U.S. Pat. Nos.
  • Bacterial biological warfare agents capable of being detected by the present methods include Bacillus anthracis (anthrax), Yersinia pestis (pneumonic plague), Franciscella tularensis (tularemia), Brucella suis, Brucella abortus, Brucella melitensis (undulant fever), Burkholderia mallei (glanders), Burkholderia pseudomalleii (melioidosis), Salmonella typhi (typhoid fever), Rickettsia typhii (epidemic typhus), Rickettsia prowasekii (endemic typhus) and Coxiella burnetii (Q fever), Rhodobacter capsulatus, Chlamydia pneumoniae, Escherichia coli, Shigella dysenteriae, Shigella flexneri, Bacillus cereus, Clostridium botulinum, Coxiella burnetti, Pseudomonas
  • target regions suitable for use in the present invention for detection of bacteria include 5S rRNA and RNase P (FIG. 3).
  • Biological warfare fungus biowarfare agents include coccidioides immitis (Coccidioidomycosis).
  • Biological warfare toxin genes capable of being detected by the methods of the present invention include botulism, T-2 mycotoxins, ricin, staph enterotoxin B, shigatoxin, abrin, aflatoxin, Clostridium perfringens epsilon toxin, conotoxins, diacetoxyscirpenol, tetrodotoxin and saxitoxin.
  • RNA viruses positive-strand and negative-strand
  • Every RNA virus is a family of related viruses (quasispecies). These viruses mutate rapidly and the potential for engineered strains (natural or deliberate) is very high.
  • RNA viruses cluster into families that have conserved RNA structural domains on the viral genome (e.g., virion components, accessory proteins) and conserved housekeeping genes that encode core viral proteins including, for single strand positive strand RNA viruses, RNA-dependent RNA polymerase, double stranded RNA helicase, chymotrypsin-like and papain-like proteases and methyltransferases.
  • Examples of ( ⁇ )-strand RNA viruses include arenaviruses (e.g., sabia virus, lassa fever, Machupo, Argentine hemorrhagic fever, flexal virus), bunyaviruses (e.g., hantavirus, nairovirus, phlebovirus, hantaan virus, Congo-crimean hemorrhagic fever, rift valley fever), and mononegavirales (e.g., filovirus, paramyxovirus, ebola virus, Marburg, equine morbillivirus).
  • arenaviruses e.g., sabia virus, lassa fever, Machupo, Argentine hemorrhagic fever, flexal virus
  • bunyaviruses e.g., hantavirus, nairovirus, phlebovirus, hantaan virus, Congo-crimean hemorrhagic fever, rift valley fever
  • (+)-strand RNA viruses include picornaviruses (e.g., coxsackievirus, echovirus, human coxsackievirus A, human echovirus, human enterovirus, human poliovirus, hepatitis A virus, human parechovirus, human rhinovirus), astroviruses (e.g., human astrovirus), calciviruses (e.g., chiba virus, chitta virus, human calcivirus, norwalk virus), nidovirales (e.g., human coronavirus, human torovirus), flaviviruses (e.g., dengue virus 1-4, Japanese encephalitis virus, Kyanasur forest disease virus, Murray Valley encephalitis virus, Rocio virus, St.
  • picornaviruses e.g., coxsackievirus, echovirus, human coxsackievirus A, human echovirus, human enterovirus, human poliovirus, hepatitis A virus, human pare
  • the hepatitis C virus has a 5′-untranslated region of 340 nucleotides, an open reading frame encoding 9 proteins having 3010 amino acids and a 3′-untranslated region of 240 nucleotides.
  • the 5′-UTR and 3′-UTR are 99% conserved in hepatitis C viruses.
  • the target gene is an RNA-dependent RNA polymerase or a helicase encoded by (+)-strand RNA viruses, or RNA polymerase from a ( ⁇ )-strand RNA virus.
  • (+)-strand RNA viruses are double stranded RNA and replicate by RNA-directed RNA synthesis using RNA-dependent RNA polymerase and the positive strand as a template. Helicase unwinds the RNA duplex to allow replication of the single stranded RNA.
  • viruses include viruses from the family picornaviridae (e.g., poliovirus, coxsackievirus, echovirus), togaviridae (e.g., alphavirus, flavivirus, rubivirus), arenaviridae (e.g., lymphocytic choriomeningitis virus, lassa fever virus), cononaviridae (e.g., human respiratory virus) and Hepatitis A virus.
  • picornaviridae e.g., poliovirus, coxsackievirus, echovirus
  • togaviridae e.g., alphavirus, flavivirus, rubivirus
  • arenaviridae e.g., lymphocytic choriomeningitis virus, lassa fever virus
  • cononaviridae e.g., human respiratory virus
  • Hepatitis A virus e.g., human respiratory virus
  • the detection scheme for the PCR products generated from the bioagent(s) incorporates three features. First, the technique simultaneously detects and differentiates multiple (generally about 6-10) PCR products. Second, the technique provides a BCS that uniquely identifies the bioagent from the possible primer sites. Finally, the detection technique is rapid, allowing multiple PCR reactions to be run in parallel.
  • the method can be used to detect the presence of antibiotic resistance and/or toxin genes in a bacterial species.
  • Bacillus anthracis comprising a tetracycline resistance plasmid and plasmids encoding one or both anthracis toxins (px01 and/or px02) can be detected by using antibiotic resistance primer sets and toxin gene primer sets. If the B. anthracis is positive for tetracycline resistance, then a different antibiotic, for example quinalone, is used.
  • Mass spectrometry (MS)-based detection of PCR products provides all of these features with additional advantages.
  • MS is intrinsically a parallel detection scheme without the need for radioactive or fluorescent labels, since every amplification product with a unique base composition is identified by its molecular mass.
  • the current state of the art in mass spectrometry is such that less than femtomole quantities of material can be readily analyzed to afford information about the molecular contents of the sample.
  • An accurate assessment of the molecular mass of the material can be quickly obtained, irrespective of whether the molecular weight of the sample is several hundred, or in excess of one hundred thousand atomic mass units (amu) or Daltons.
  • Intact molecular ions can be generated from amplification products using one of a variety of ionization techniques to convert the sample to gas phase. These ionization methods include, but are not limited to, electrospray ionization (ES), matrix-assisted laser desorption ionization (MALDI) and fast atom bombardment (FAB).
  • ES electrospray ionization
  • MALDI matrix-assisted laser desorption ionization
  • FAB fast atom bombardment
  • MALDI of nucleic acids along with examples of matrices for use in MALDI of nucleic acids, are described in WO 98/54751 (Genetrace, Inc.).
  • Electrospray ionization mass spectrometry is particularly useful for very high molecular weight polymers such as proteins and nucleic acids having molecular weights greater than 10 kDa, since it yields a distribution of multiply-charged molecules of the sample without causing a significant amount of fragmentation.
  • the mass detectors used in the methods of the present invention include, but are not limited to, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), ion trap, quadrupole, magnetic sector, time of flight (TOF), Q-TOF, and triple quadrupole.
  • FT-ICR-MS Fourier transform ion cyclotron resonance mass spectrometry
  • ion trap ion trap
  • quadrupole quadrupole
  • magnetic sector magnetic sector
  • TOF time of flight
  • Q-TOF Q-TOF
  • triple quadrupole triple quadrupole
  • the mass spectrometric techniques which can be used in the present invention include, but are not limited to, tandem mass spectrometry, infrared multiphoton dissociation and pyrolytic gas chromatography mass spectrometry (PGC-MS).
  • the bioagent detection system operates continually in bioagent detection mode using pyrolytic GC-MS without PCR for rapid detection of increases in biomass (for example, increases in fecal contamination of drinking water or of germ warfare agents).
  • a continuous sample stream flows directly into the PGC-MS combustion chamber.
  • a PCR process is automatically initiated.
  • Bioagent presence produces elevated levels of large molecular fragments from 100-7,000 Da which are observed in the PGC-MS spectrum.
  • the observed mass spectrum is compared to a threshold level and when levels of biomass are determined to exceed a predetermined threshold, the bioagent classification process described hereinabove(combining PCR and MS, preferably FT-ICR MS) is initiated.
  • alarms or other processes are also initiated by this detected biomass level.
  • tandem mass spectrometry (MS n ) techniques may provide more definitive information pertaining to molecular identity or sequence.
  • Tandem MS involves the coupled use of two or more stages of mass analysis where both the separation and detection steps are based on mass spectrometry. The first stage is used to select an ion or component of a sample from which further structural information is to be obtained. The selected ion is then fragmented using, e.g., blackbody irradiation, infrared multiphoton dissociation, or collisional activation. For example, ions generated by electrospray ionization (ESI) can be fragmented using IR multiphoton dissociation.
  • ESI electrospray ionization
  • This activation leads to dissociation of glycosidic bonds and the phosphate backbone, producing two series of fragment ions, called the w-series (having an intact 3′ terminus and a 5′ phosphate following internal cleavage) and the a-Base series(having an intact 5′ terminus and a 3′ furan).
  • the second stage of mass analysis is then used to detect and measure the mass of these resulting fragments of product ions.
  • Such ion selection followed by fragmentation routines can be performed multiple times so as to essentially completely dissect the molecular sequence of a sample.
  • a nucleotide analog or “tag” is incorporated during amplification (e.g., a 5-(trifluoromethyl) deoxythymidine triphosphate) which has a different molecular weight than the unmodified base so as to improve distinction of masses.
  • tags are described in, for example, PCT WO97/33000. This further limits the number of possible base compositions consistent with any mass.
  • 5-(trifluoromethyl)deoxythymidine triphosphate can be used in place of dTTP in a separate nucleic acid amplification reaction.
  • Measurement of the mass shift between a conventional amplification product and the tagged product is used to quantitate the number of thymidine nucleotides in each of the single strands. Because the strands are complementary, the number of adenosine nucleotides in each strand is also determined.
  • the number of G and C residues in each strand is determined using, for example, the cytidine analog 5-methylcytosine (5-meC) or propyne C.
  • T* ⁇ T x AT*GCAT*GCA 2A 2T 2C 2G 2G 2C AT*GCAT*GCA 2x 2T 2A
  • C* ⁇ mass TAC*GTAC*GT TAC*GTAC*GT 2x 2C 2G (C* ⁇ C) y ATGC*ATGCA ATGC*ATGC*A 2x 2C 2G
  • the mass tag phosphorothioate A (A*) was used to distinguish a Bacillus anthracis cluster.
  • the B. anthracis (A 14 G 9 C 14 T 9 ) had an average MW of 14072.26, and the B. anthracis (A 1 A* 13 G 9 C 14 T 9 ) had an average molecular weight of 14281.11 and the phosphorothioate A had an average molecular weight of +16.06 as determined by ESI-TOF MS.
  • the deconvoluted spectra are shown in FIG. 5.
  • Signals from the mass spectrometer may be input to a maximum-likelihood detection and classification algorithm such as is widely used in radar signal processing.
  • the detection processing uses matched filtering of BCS observed in mass-basecount space and allows for detection and subtraction of signatures from known, harmless organisms, and for detection of unknown bioagent threats. Comparison of newly observed bioagents to known bioagents is also possible, for estimation of threat level, by comparing their BCS to those of known organisms and to known forms of pathogenicity enhancement, such as insertion of antibiotic resistance genes or toxin genes.
  • Processing may end with a Bayesian classifier using log likelihood ratios developed from the observed signals and average background levels.
  • the program emphasizes performance predictions culminating in probability-of-detection versus probability-of-false-alarm plots for conditions involving complex backgrounds of naturally occurring organisms and environmental contaminants.
  • Matched filters consist of a priori expectations of signal values given the set of primers used for each of the bioagents.
  • a genomic sequence database e.g. GenBank
  • GenBank is used to define the mass basecount matched filters.
  • the database contains known threat agents and benign background organisms. The latter is used to estimate and subtract the signature produced by the background organisms.
  • a maximum likelihood detection of known background organisms is implemented using matched filters and a running-sum estimate of the noise covariance.
  • a strategy to “triangulate” each organism by measuring signals from multiple core genes is used to reduce false negative and false positive signals, and enable reconstruction of the origin or hybrid or otherwise engineered bioagents.
  • alignments are created from nucleic acid sequence databases. The alignments are then analyzed for regions of conservation and variation, and potential primer binding sites flanking variable regions are identified.
  • amplification target regions for signature analysis are selected which distinguishes organisms based on specific genomic differences (i.e., base composition). For example, detection of signatures for the three part toxin genes typical of B. anthracis (Bowen, J. E. and C. P. Quinn, J. Appl. Microbiol . 1999, 87, 270-278) in the absence of the expected signatures from the B. anthracis genome would suggest a genetic engineering event.
  • the present method can also be used to detect single nucleotide polymorphisms (SNPs), or multiple nucleotide polymorphisms, rapidly and accurately.
  • SNP single nucleotide polymorphisms
  • a SNP is defined as a single base pair site in the genome that is different from one individual to another. The difference can be expressed either as a deletion, an insertion or a substitution, and is frequently linked to a disease state. Because they occur every 100-1000 base pairs, SNPs are the most frequently bound type of genetic marker in the human genome.
  • sickle cell anemia results from an A-T transition, which encodes a valine rather than a glutamic acid residue.
  • oligonucleotide primers may be designed such that they bind to sequences which flank a SNP site, followed by nucleotide amplification and mass determination of the amplified product. Because the molecular masses of the resulting product from an individual who does not have sickle cell anemia is different from that of the product from an individual who has the disease, the method can be used to distinguish the two individuals. Thus, the method can be used to detect any known SNP in an individual and thus diagnose or determine increased susceptibility to a disease or condition.
  • blood is drawn from an individual and peripheral blood mononuclear cells (PBMC) are isolated and simultaneously tested, preferably in a high-throughput screening method, for one or more SNPs using appropriate primers based on the known sequences which flank the SNP region.
  • PBMC peripheral blood mononuclear cells
  • the National Center for Biotechnology Information maintains a publicly available database of SNPs (http://www.ncbi.nlm.nih.gov/SNP/).
  • the method of the present invention can also be used for blood typing.
  • the gene encoding A, B or O blood type can differ by four single nucleotide polymorphisms. If the gene contains the sequence CGTGGTGACCCTT, antigen A results. If the gene contains the sequence CGTCGTCACCGCTA antigen B results. If the gene contains the sequence CGTGGT-ACCCCTT, blood group O results (“ ⁇ ” indicates a deletion). These sequences can be distinguished by designing a single primer pair which flanks these regions, followed by amplification and mass determination.
  • nucleic acid is isolated from the organisms and amplified by PCR using standard methods prior to BCS determination by mass spectrometry.
  • Nucleic acid is isolated, for example, by detergent lysis of bacterial cells, centrifugation and ethanol precipitation. Nucleic acid isolation methods are described in, for example, Current Protocols in Molecular Biology (Ausubel et al.) and Molecular Cloning; A Laboratory Manual (Sambrook et al.).
  • the nucleic acid is then amplified using standard methodology, such as PCR, with primers which bind to conserved regions of the nucleic acid which contain an intervening variable sequence as described below.
  • FTICR Instrumentation The FTICR instrument is based on a 7 tesla actively shielded superconducting magnet and modified Bruker Daltonics Apex II 70e ion optics and vacuum chamber. The spectrometer is interfaced to a LEAP PAL autosampler and a custom fluidics control system for high throughput screening applications. Samples are analyzed directly from 96-well or 384-well microtiter plates at a rate of about 1 sample/minute.
  • the Bruker data-acquisition platform is supplemented with a lab-built ancillary NT datastation which controls the autosampler and contains an arbitrary waveform generator capable of generating complex rf-excite waveforms (frequency sweeps, filtered noise, stored waveform inverse Fourier transform (SWIFT), etc.) for sophisticated tandem MS experiments.
  • a lab-built ancillary NT datastation which controls the autosampler and contains an arbitrary waveform generator capable of generating complex rf-excite waveforms (frequency sweeps, filtered noise, stored waveform inverse Fourier transform (SWIFT), etc.) for sophisticated tandem MS experiments.
  • SWIFT stored waveform inverse Fourier transform
  • Modified ESI Source In sample-limited analyses, analyte solutions are delivered at 150 nL/minute to a 30 mm i.d. fused-silica ESI emitter mounted on a 3-D micromanipulator.
  • the ESI ion optics consist of a heated metal capillary, an rf-only hexapole, a skimmer cone, and an auxiliary gate electrode.
  • the 6.2 cm rf-only hexapole is comprised of 1 mm diameter rods and is operated at a voltage of 380 Vpp at a frequency of 5 MHz.
  • a lab-built electromechanical shutter can be employed to prevent the electrospray plume from entering the inlet capillary unless triggered to the “open” position via a TTL pulse from the data station.
  • a stable electrospray plume is maintained between the ESI emitter and the face of the shutter.
  • the back face of the shutter arm contains an elastomeric seal which can be positioned to form a vacuum seal with the inlet capillary. When the seal is removed, a 1 mm gap between the shutter blade and the capillary inlet allows constant pressure in the external ion reservoir regardless of whether the shutter is in the open or closed position.
  • a “time slice” of ions is allowed to enter the inlet capillary and is subsequently accumulated in the external ion reservoir.
  • the rapid response time of the ion shutter ( ⁇ 25 ms) provides reproducible, user defined intervals during which ions can be injected into and accumulated in the external ion reservoir.
  • a 25 watt CW CO 2 laser operating at 10.6 ⁇ m has been interfaced to the spectrometer to enable infrared multiphoton dissociation (IRMPD) for oligonucleotide sequencing and other tandem MS applications.
  • An aluminum optical bench is positioned approximately 1.5 m from the actively shielded superconducting magnet such that the laser beam is aligned with the central axis of the magnet.
  • the unfocused 3 mm laser beam is aligned to traverse directly through the 3.5 mm holes in the trapping electrodes of the FTICR trapped ion cell and longitudinally traverse the hexapole region of the external ion guide finally impinging on the skimmer cone.
  • This scheme allows IRMPD to be conducted in an m/z selective manner in the trapped ion cell (e.g. following a SWIFT isolation of the species of interest), or in a broadband mode in the high pressure region of the external ion reservoir where collisions with neutral molecules stabilize IRMPD-generated metastable fragment ions resulting in increased fragment ion yield and sequence coverage.
  • Table 1 shows a small cross section of a database of calculated molecular masses for over 9 primer sets and approximately 30 organisms.
  • the primer sets were derived from rRNA alignment. Examples of regions from rRNA consensus alignments are shown in FIGS. 1 A- 1 C. Lines with arrows are examples of regions to which intelligent primer pairs for PCR are designed.
  • the primer pairs are >95% conserved in the bacterial sequence database (currently over 10,000 organisms).
  • the intervening regions are variable in length and/or composition, thus providing the base composition “signature” (BCS) for each organism.
  • Primer pairs were chosen so the total length of the amplified region is less than about 80-90 nucleotides.
  • the label for each primer pair represents the starting and ending base number of the amplified region on the consensus diagram.
  • FIG. 6 shows the use of ESI-FT-ICR MS for measurement of exact mass.
  • the spectra from 46 mer PCR products originating at position 1337 of the 16S rRNA from S. aureus (upper) and B. anthracis (lower) are shown. These data are from the region of the spectrum containing signals from the [M ⁇ 0 8H+] 8 ⁇ charge states of the respective 5′-3′ strands.
  • the two strands differ by two (AT ⁇ CG) substitutions, and have measured masses of 14206.396 and 14208.373 ⁇ 0.010 Da, respectively.
  • the possible base compositions derived from the masses of the forward and reverse strands for the B. anthracis products are listed in Table 3. TABLE 3 Possible base composition for B.
  • the pathogen Vibrio cholera can be distinguished from Vibrio parahemolyticus with ⁇ M>600 Da using one of three 16S primer sets shown in Table 2 (16S — 971, 16S — 1228 or 16S — 1294) as shown in Table 4.
  • the two mycoplasma species in the list ( M. genitalium and M. pneumoniae ) can also be distinguished from each other, as can the three mycobacteriae. While the direct mass measurements of amplified products can identify and distinguish a large number of organisms, measurement of the base composition signature provides dramatically enhanced the base composition signature provides dramatically enhanced resolving power for closely related organisms.
  • compositional analysis or fragmentation patterns are used to resolve the differences.
  • the single base difference between the two organisms yields different fragmentation patterns, and despite the presence of the ambiguous/unidentified base N at position 20 in B. anthracis , the two organisms can be identified.
  • Tables 4a-b show examples of primer pairs from Table 1 which distinguish pathogens from background.
  • Table 4 shows the expected molecular weight and base composition of region 16S — 1100-1188 in Mycobacterium avium and Streptomyces sp. TABLE 5 Molecular Base Region Organism name Length weight comp. 16S_1100- Mycobacterium 82 25624.1728 A 16 G 32 C 18 T 16 1188 avium 16S_1100- Streptomyces sp. 96 29904.871 A 17 G 38 C 27 T 14 1188
  • Table 5 shows base composition (single strand) results for 16S — 1100-1188 primer amplification reactions different species of bacteria. Species which are repeated in the table (e.g., Clostridium botulinum ) are different strains which have different base compositions in the 16S — 1100-1188 region.
  • TABLE 6 Base Organism name comp. Mycobacterium avium A 16 G 32 C 18 T 16 Streptomyces sp. A 17 G 38 C 27 T 14 Ureaplasma A 18 G 30 C 17 T 17 urealyticum Streptomyces sp.
  • the same organism having different base compositions are different strains. Groups of organisms which are highlighted or in italics have the same base compositions in the amplified region. Some of these organisms can be distinguished using multiple primers. For example, Bacillus anthracis can be distinguished from Bacillus cereus and Bacillus thuringiensis using the primer 16S — 971-1062 (Table 6). Other primer pairs which produce unique base composition signatures are shown in Table 6 (bold). Clusters containing very similar threat and ubiquitous non-threat organisms (e.g. anthracis cluster) are distinguished at high resolution with focused sets of primer pairs.
  • the known biowarfare agents in Table 6 are Bacillus anthracis, Yersinia pestis, Francisella tularensis and Rickettsia prowazekii .
  • B. anthracis has an ambiguous base at position 20 .
  • the mass measurement accuracy that can be obtained using an internal mass standard in the ESI-MS study of PCR products is shown in FIG.8.
  • the mass standard was a 20-mer phosphorothioate oligonucleotide added to a solution containing a 56-mer PCR product from the B. anthracis spore coat protein sspE.
  • the mass of the expected PCR product distinguishes B. anthracis from other species of Bacillus such as B. thuringiensis and B. cereus.
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