WO2017120309A1 - Amplification comparative de locus pour déterminer un nombre de copies - Google Patents

Amplification comparative de locus pour déterminer un nombre de copies Download PDF

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Publication number
WO2017120309A1
WO2017120309A1 PCT/US2017/012298 US2017012298W WO2017120309A1 WO 2017120309 A1 WO2017120309 A1 WO 2017120309A1 US 2017012298 W US2017012298 W US 2017012298W WO 2017120309 A1 WO2017120309 A1 WO 2017120309A1
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Prior art keywords
oligonucleotide primer
fluorescent
nucleotide sequence
labeled
chromosome
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PCT/US2017/012298
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English (en)
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Robert N. VAUGHN
David M. Stelly
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The Texas A&M University System
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Publication of WO2017120309A1 publication Critical patent/WO2017120309A1/fr

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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
    • C12Q1/6844—Nucleic acid amplification reactions
    • C12Q1/6858—Allele-specific amplification

Definitions

  • the present invention relates generally to methods for determining the copy number of a nucleotide sequence of interest in a biological sample, more specifically to rapid and inexpensive methods for determining copy number or copy number variation of a nucleotide sequence of interest, for example a chromosome or gene, in a biological sample.
  • the present invention provides a method for determining copy number of a nucleotide sequence of interest in a nucleic acid sample, comprising the steps of: (a) amplifying the nucleotide sequence of interest or a portion thereof in the nucleic acid sample using a first oligonucleotide primer comprising a 3' region that preferentially or specifically binds to said nucleotide sequence of interest or portion thereof and a 5' region that comprises a nucleotide sequence corresponding to a first fluorescent-labeled oligonucleotide primer and a second oligonucleotide primer, and amplifying a control nucleotide sequence comprising a known copy number in the nucleic acid sample using a third oligonucleotide primer comprising a 3' region that preferentially or specifically binds to the control nucleotide sequence and a 5' region that comprises a nucleotide sequence corresponding to a second fluorescent-labeled oli
  • the nucleotide sequence of interest comprises genomic DNA, such as a portion of a chromosome, a gene or a regulatory element.
  • the nucleic acid sample is from a plant, such as a cotton, sorghum, maize, tomato, rice, barley or wheat plant, or a mammal, for example a livestock animal such as a cow, pig, sheep, chicken, goat, horse, turkey, duck, or goose, a companion animal, such as a dog, cat, rabbit, guinea pig or hamster, or a human.
  • first fluorescent-labeled oligonucleotide primer and the second fluorescent-labeled oligonucleotide primer are labeled with two different fluorochromes or fluorescent dyes. Fluorochromes or fluorescent dyes for use in particular embodiments of the present invention are set forth in detail below.
  • first quenching oligonucleotide primer and the second quenching oligonucleotide primer is labeled with the same or different labels for quenching the fluorescence of the first fluorescent-labeled oligonucleotide primer and the second fluorescent-labeled oligonucleotide primer.
  • Labels for quenching the fluorescence of the fluorochromes or fluorescent dyes used for the first fluorescent-labeled oligonucleotide primer and the second fluorescent-labeled oligonucleotide primer for use in exemplary embodiments of the present invention are set forth in detail below.
  • the method further comprises the use of a passive fluorescent marker as a fluorescence standard.
  • the present invention provides a method of determining copy number of a nucleotide sequence of interest in a first nucleic acid sample, comprising the steps of: (a) amplifying the nucleotide sequence of interest or a portion thereof in the first nucleic acid sample using a first oligonucleotide primer comprising a 3' region that specifically binds to said nucleotide sequence of interest or portion thereof and a 5' region that comprises a nucleotide sequence corresponding to a first fluorescent-labeled oligonucleotide primer and a second oligonucleotide primer, and amplifying a control nucleotide sequence comprising a known copy number in the first nucleic acid sample using a third oligonucleotide primer comprising a 3' region that specifically binds to the control nucleotide sequence and a 5' region that comprises a nucleotide sequence corresponding to a second fluorescent-labeled oligonucleo
  • FIG. 1 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome- 10 sequence, based on normalization of the chromosome- 10 sequence to a chromosome- 16 sequence in Gossypium hirsutum L.
  • FIG. 2 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome- 10 sequence, based on normalization of the chromosome- 10 sequence to a chromosome-20 sequence in Gossypium hirsutum L.
  • CLA comparative locus amplification
  • FIG. 3 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome- 11 sequence, based on normalization of the chromosome- 11 sequence to a chromosome-20 sequence in Gossypium hirsutum L.
  • CLA comparative locus amplification
  • FIG. 4 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome-20 sequence, based on normalization of the chromosome-20 sequence to a chromosome- 10 sequence in Gossypium hirsutum L.
  • CLA comparative locus amplification
  • FIG. 5 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome-20 sequence, based on normalization of the chromosome-20 sequence to a chromosome- 11 sequence in Gossypium hirsutum L.
  • CLA comparative locus amplification
  • FIG. 6 Shows the results of comparative locus amplification (CLA) for a "gBlock” dilution series for a chromosome- 11 sequence from Gossypium hirsutum L, using UBCl as the reference sequence.
  • FIG. 7 Shows the results of comparative locus amplification (CLA) analysis on euploid
  • TM1 genetic/cytogenetic standard and chromosome-11 monosomic aneuploids (“Hl l") to determine where they fell relative to the synthetic "gBlock” dilutions.
  • FIG. 8 - Shows the results of a dilution series of comparative locus amplification (CLA) assays to test the sensitivity of FAM/HEX signal ratios to starting concentration of sample template DNA.
  • CLA comparative locus amplification
  • FIG. 9 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome 3 sequence, using UBCl as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 10 Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome 7 sequence, using UBCl as the reference sequence.
  • FIG. 11 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome- 10 sequence, using UBCl as the reference sequence.
  • FIG. 12 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome- 11 sequence, using UBCl as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 13 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome- 16 sequence, using SAD1 as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 14 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome-21 sequence, using UBCl as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 15 - Shows the results of comparative locus amplification (CLA) to determine the copy number of a chromosome-25 sequence, using UBCl as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 16 - Shows the results of comparative locus amplification (CLA) for a transgene insert in a first transformed line, using UBCl as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 17 - Shows the results of comparative locus amplification (CLA) for a transgene insert in a second transformed line, using UBCl as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 18 - Shows the results of comparative locus amplification (CLA) for a transgene insert in a first transformed line, using UBCl as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 19 - Shows the results of comparative locus amplification (CLA) for a transgene insert in a second transformed line, using UBCl as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 20 - Shows the results of comparative locus amplification (CLA) for a Gossypium insert in a first transformed line, using UBCl as the reference sequence.
  • CLA comparative locus amplification
  • FIG. 21 - Shows the results of comparative locus amplification (CLA) for a Gossypium insert in the Coker 312 parent line, using UBCl as the reference sequence.
  • the present invention provides methods for determining the relative copy number, or copy number variation (CNV), in a biological sample using comparative locus amplification (CLA).
  • Comparative Locus Amplification presents alternative means of detecting or determining copy number variation (CNV).
  • the CLA methods provided herein fill certain niches better that all existing methods of CNV analysis.
  • the present invention uses a fluorochrome -based reporting system, such as fluorescence resonance energy transfer (FRET), to quantitate the relative amounts of two non-allelic target nucleotide sequences, and thus can be used to determine copy number, as well as copy number differences and CNV of nucleotide sequences in a biological sample.
  • FRET fluorescence resonance energy transfer
  • the methods utilize locus -specific and sequence-distinct primer pairs tagged with generic oligonucleotides that upon polymerase chain reaction (PCR) amplification lead to the release from quenching of two (or more) diagnostic fluorochromes and leads to fluorescence at two wavelengths that are largely locus -specific.
  • PCR polymerase chain reaction
  • the relative amplitudes of the two fluorescent markers will vary according to the relative copy number of the "target” and "control” (reference) nucleotide sequences.
  • the target nucleotide sequence is present in a higher or lower copy number than the control nucleotide sequence, making it a convenient and cost-effective method for rapid and accurate determination of the copy number or copy number variation of a nucleotide sequence in a biological sample. Additionally, the methods described herein require no special or advanced expertise or equipment, in contrast to certain currently available methods.
  • CNVs are heritable differences that can be associated with genetic, genomic and phenotypic variation (such as flowering time, plant height and resistance to various biotic/abiotic stresses in plants), and thus are important in many areas of biology, for example to plant and animal breeders, as well as in medical diagnostics and treatment. Rapid and accurate determination of the copy number of a nucleotide or nucleic acid sequence in organisms, tissues or cells can be problematic. This is especially true in polyploid plants due to increased copy number of identical or similar DNA sequences.
  • the presently disclosed CLA techniques facilitate germplasm characterization, genome characterization and germplasm manipulation, e.g. , germplasm surveys for CNV, genome sequence assembly and identification of various types of aneuploids.
  • the CLA system allows for CNV analysis for breeders of a variety of commercially significant crops and animals to select the parents for breeding in a targeted method that is rapid and relatively inexpensive.
  • the presently described CLA system can be used to screen for CNV (for example, aneuploidy, segmental duplications and deletions), e.g. , in relationship to specific diseases or cancers.
  • CNV for example, aneuploidy, segmental duplications and deletions
  • Being PCR-based it can be applied to minute samples and is amenable to portable delivery.
  • CLA has a large number of context- specific applications, such as facilitating the selection of variants during breeding of commercially significant crops or animals, thus facilitating the development of new commercial lines with valuable traits. Additionally CLA can be used to discover or identify novel genetic variants and to introduce them into elite breeding germplasm, e.g. , for agriculturally important traits. CLA allows for the development of new lines in a way that otherwise would be very expensive and/or difficult. CLA allows breeders to screen a large number of progeny (e.g. , seeds) for a particular CNV of interest and select out only those carrying the CNV of interest, reducing the costs and generation time for advancing various traits related to these CNVs.
  • progeny e.g. , seeds
  • a biological sample may also include clinical samples such as blood and blood parts including, but not limited to, serum, plasma, platelets, or red blood cells; sputum, mucosa, tissue, cultured cells, including primary cultures, explants, and transformed cells; and biological fluids.
  • a biological sample may also include sections of tissues such as biopsy and autopsy samples, and frozen sections taken for histologic purposes.
  • a biological sample may be obtained from a eukaryotic organism, for example a plant, including cotton, sorghum, maize, tomato and wheat, or a mammal, including humans, cows, pigs, chickens, turkeys, ducks, geese, dogs, goats, and the like.
  • Any tissue appropriate for use in accordance with the invention may be used, for instance, plant leaves, seeds, roots or stems, or animal skin, brain, spinal cord, adrenals, pectoral muscle, lung, heart, liver, crop, duodenum, small intestine, large intestine, kidney, spleen, pancreas, adrenal gland, bone marrow, lumbosacral spinal cord, or blood.
  • Nucleic acids such as DNA or RNA
  • Nucleic acids for use in the described methods may be isolated using any method available as would be known by one of skill in the art.
  • a commercially available kit such as the NucleoSpin® Plant II kit (MACHERY- NAGEL) or the PrepMan® Ultra Sample Preparation Reagent (Applied Biosystems, Life Technologies) may be used to isolate DNA from a biological sample.
  • the isolated DNA can be assessed for quality and quantity using any of the numerous methods known to those of skill in the art.
  • the absorbance of the DNA sample at 230 nm, 260 nm and 280 nm can be obtained using a DS-11 photo spectrometer (DeNovix®, Inc.), and determining the ratio of the absorbance at 260 nm to the absorbance at 280 nm, and the ratio of the absorbance at 260 nm to the absorbance at 230 nm (DNA samples having ratios of approximately 1.8 and 2.0, respectively, can be used in certain embodiments of the present invention).
  • PCR and RT-PCR may be used to amplify nucleic acid sequences directly from genomic material, such as genomic DNA, mRNA, cDNA, or from genomic libraries, or cDNA libraries.
  • genomic material such as genomic DNA, mRNA, cDNA, or from genomic libraries, or cDNA libraries.
  • primers may be designed using any suitable method. It is not intended that the invention be limited to any particular primer or primer pair.
  • the fluorescent-labeled primers incorporate two different fluorescent labels or markers, while in other embodiments a passive fluorescent dye or fluorochrome is used.
  • Suitable fluorescent labels, markers, dyes or fluorochromes for use in certain embodiments of the present invention include, but are not limited to, FAMTM, 5-FAM, 6-FAMTM, TETTM, JOETM, VIC®, HEXTM, NEDTM, PET®, ROXTM, TAMRATM, TETTM, Texas Red®, CAL Fluor® Gold 540, CAL Fluor® Orange 560, CAL Fluor® Red 590, CAL Fluor® Red 610, CAL Fluor® Red 635, Cy® (cyanine) 3, Cy® 3.5, Cy® 5, Cy® 5.5, Cy® 7, Cy® 7.5, Quasar® 570, Quasar® 670, Quasar® 705, Oyster®-500, Oyster®-550 P, Oyster®-550 D, Oyster®-556, Oyster
  • the quenching oligonucleotide primers incorporate a quencher label for the fluorescent labels or markers.
  • Suitable quencher labels for use in certain embodiments of the present invention include, but are not limited to, Deep Dark Quencher I (DDQI), Deep Dark Quencher II (DDQII), dabcyl, EclipseTM, Iowa Black® FQ, Iowa Black® RQ, Black Hole Quencher-0 (BHQ-0), Black Hole Quencher- 1 (BHQ-1), Black Hole Quencher-2 (BHQ-2), Black Hole Quencher-3 (BHQ-3), Black Hole Quencher- 10 (BHQ-10), QSY®-7 or QSY®-21.
  • primers of the invention be limited to generating an amplicon of any particular size.
  • the primers used to amplify a region of a chromosome, a chromosome fragment, gene or sequence described herein are not limited to amplifying the entire region of a relevant locus.
  • a primer can generate an amplicon of any suitable length that is longer or shorter than those disclosed herein.
  • amplification of a target sequence may produce an amplicon at least 20 nucleotides in length, or alternatively, at least 50 nucleotides in length, or alternatively, at least 100 nucleotides in length, or alternatively, at least 200 nucleotides in length.
  • Target sequences in addition to those recited herein may also find use with the present invention.
  • Primers for use in the present invention may be any length sufficient to hybridize to and enable amplification of a nucleic acid as described herein, including at least or about 10 nucleotides, 11 nucleotides, 12 nucleotides, 13 nucleotides, 14 nucleotides, 15 nucleotides, 16 nucleotides, 17 nucleotides, 18 nucleotides, 19 nucleotides, 20 nucleotides, 21 nucleotides, 22 nucleotides, 23 nucleotides, 24 nucleotides, 25 nucleotides, 26 nucleotides, 27 nucleotides, 28 nucleotides, 29 nucleotides, 30 nucleotides, 35 nucleotides, 40 nucleotides, 45 nucleotides, or 50 nucleotides; or from about 12 to about 50 nucleotides in length, 15 to 30 nucleotides in length, 15 to 25 nucleotides in length, or 20
  • a PCR assay may include a number of reagents and components, including a master mix comprising certain primers that are labeled with a fluorescent nucleic acid dye or quencher, as detailed herein.
  • an exemplary PCR master mix may contain template nucleic acid material, such as DNA, PCR primers, salts such as MgCl 2 , a polymerase enzyme, such as Taq polymerase, deoxyribonucleotides, and one or more buffer.
  • template nucleic acid material such as DNA
  • PCR primers such as DNA
  • salts such as MgCl 2
  • a polymerase enzyme such as Taq polymerase, deoxyribonucleotides
  • a master mix such as KASPTM Master Mix (LCG Ltd.), which contains the high resolution melting (HRM) dye, SYTO ® 9 may be used.
  • HRM high resolution melting
  • SYTO ® 9 may be used.
  • PCR may be performed in any reaction volume, such as 10 ⁇ ⁇ , 20 ⁇ ⁇ , 30 ⁇ ⁇ , 50 ⁇ ⁇ , 100 ⁇ ⁇ , or the like. Reactions may be performed singly, in duplicate, or in triplicate. PCR thermal cycling conditions are well known in the art and vary based on a number of factors.
  • an exemplary amplification protocol may include, for example, an initial denaturation at 94°C for 15 minutes; 10 cycles of 94°C for 20 seconds, 55-61°C for 60 seconds (-0.6°C per cycle); and 18 cycles +2 until the optimum is reached at 94°C for 20 seconds, 55°C for 60 seconds.
  • Any thermal cycling program may be designed as appropriate for use with the particular primers for detection of particular nucleic acid species as would be understood by one of skill in the art.
  • Test samples or assays as described herein may be compared to a control or reference sample, such as a copy number control, in order to accurately determine the copy number of the test sample.
  • a reaction control may be used to avoid false negative results and thereby increase the reliability of an assay.
  • reaction control provides assurance that a negative result for a target is truly a negative result rather than due to a problem or break-down in the reaction. Because the signal for the reaction control should always be generated, even when the target signal is not generated (i.e., the target DNA is not present in the sample), this would indicate that a negative target signal is indeed a negative result.
  • a reaction control may be useful in diagnostic assays because certain biological samples may harbor inhibitory components that may interfere with PCR amplification, leading to false negative results.
  • control reactions without any DNA can be utilized to rule out false positive results that could result from contamination of one or more of the reaction components, and/or interactions of reaction components, e.g. , primer sets.
  • complementary nucleic acids refers to two nucleic acid molecules that are capable of specifically hybridizing to one another, wherein the two molecules are capable of forming an anti-parallel, double-stranded nucleic acid structure.
  • a nucleic acid molecule is said to be the complement of another nucleic acid molecule if they exhibit complete complementarity.
  • Two molecules are said to be “minimally complementary” if they can hybridize to one another with sufficient stability to permit them to remain annealed to one another under at least conventional "low- stringency” conditions.
  • the molecules are said to be complementary if they can hybridize to one another with sufficient stability to permit them to remain annealed to one another under conventional "high-stringency" conditions.
  • Conventional stringency conditions are known in the art.
  • nucleic acid molecule or a fragment of the nucleic acid molecule need only be sufficiently complementary in sequence to be able to form a stable double-stranded structure under the particular solvent and salt concentrations employed.
  • a nucleotide sequence when observed in the 5' to 3' direction is said to be a "complement" of, or complementary to, a second nucleotide sequence observed in the 3' to 5' direction if the first nucleotide sequence exhibits complete complementarity with the second or reference sequence.
  • nucleic acid sequence molecules are said to exhibit "complete complementarity" when every nucleotide of one of the sequences read 5' to 3' is complementary to every nucleotide of the other sequence when read 3' to 5' .
  • a nucleotide sequence that is complementary to a reference nucleotide sequence will exhibit a sequence identical to the reverse complement sequence of the reference nucleotide sequence.
  • kits comprising one or more such reagents or components for use in a variety of diagnostic assays, including for example, nucleic acid assays, e.g. , PCR or RT-PCR assays.
  • diagnostic assays including for example, nucleic acid assays, e.g. , PCR or RT-PCR assays.
  • kits may preferably include at least a first and second primer pair as described herein, and means for detecting amplification of a target and control sequence.
  • such a kit may contain multiple primer pairs as described herein for the purpose of detection of multiple target sequences.
  • Primer pairs may be provided in lyophilized, dessicated, or dried form, or may be provided in an aqueous solution or other liquid media appropriate for use in accordance with the invention.
  • Kits may also include additional reagents, e.g. , PCR components, such as salts including
  • nucleic acid refers to a single or double- stranded polymer of deoxyribonucleotide bases or ribonucleotide bases read from the 5' to the 3' end, which may include genomic DNA, target sequences, primer sequences, or the like.
  • a “nucleic acid” may refer to any DNA or nucleic acid to be used in an assay as described herein, which may be isolated or extracted from a biological sample.
  • nucleotide sequence or “nucleic acid sequence” refers to both the sense and antisense strands of a nucleic acid as either individual single strands or in the duplex.
  • nucleic acid segment “nucleotide sequence segment,” or more generally, “segment,” will be understood by those in the art as a functional term that includes genomic sequences, target sequences, operon sequences, and smaller engineered nucleotide sequences that express or may be adapted to express, proteins, polypeptides or peptides.
  • the nomenclature used herein is that required by Title 37 of the United States Code of Federal Regulations ⁇ 1.822 and set forth in the tables in WIPO Standard ST.25 (1998), Appendix 2, Tables 1 and 3.
  • the term "gene” refers to components that comprise bacterial DNA or RNA, cDNA, artificial bacterial DNA polynucleotide, or other DNA that encodes a bacterial peptide, bacterial polypeptide, bacterial protein, or bacterial RNA transcript molecule, introns and/or exons where appropriate, and the genetic elements that may flank the coding sequence that are involved in the regulation of expression, such as, promoter regions, 5' leader regions, 3' untranslated region that may exist as native genes or transgenes in a bacterial genome.
  • the gene or a fragment thereof can be subjected to polynucleotide sequencing methods that determines the order of the nucleotides that comprise the gene.
  • Polynucleotides as described herein may be complementary to all or a portion of a bacterial gene sequence, including a promoter, coding sequence, 5' untranslated region, and 3' untranslated region. Nucleotides may be referred to by their commonly accepted single-letter codes.
  • the euploid TM-1 served as a reference genotype, and was compared to H10, which is monosomic for chromosome- 10 (only one copy of that chromosome, but two copies of all other chromosomes, including chromosome- 16).
  • the relative dosage of the genomic sequence amplified by PCR was gauged by using FAM and HEX fluorescence that correlates to the relative amounts of PCR-based amplification from a primer set that amplifies a chromosome- 10 genomic sequence, versus a primer set that amplifies a chromosome-16 genomic sequence.
  • TM-1 and H10 do NOT differ in dosage for the targeted reference chromosome-16 genomic sequence, they do differ two-fold for the targeted chromosome- 10 genomic sequence.
  • the relative copy number of a chromosome-10 locus in the H10 monosomic stock of Gossypium hirsutum L. was compared to the relative copy number of chromosome-10 in the TM1 control (two copies of chromosome-10 and two copies of chromosome-16 per cell).
  • Chromosome-16 was used as a reference point for both sets of samples, and the ratio of FAM/HEX fluorescence signals from PCR amplification of the chromosome-10 and -16 loci was used to evaluate the H10 and TM-1 genotypes.
  • Reactions were set up with DNA extracted from leaf tissue from the H10 or TM-1 plants using the NucleoSpin® Plant II Kit (MACHERY-NAGEL GmbH & Co. KG); at least two blanks were used as non-template controls.
  • the reactions contained KASP Master Mix (LGC, Limited), which contains the FAMTM-specific cassette (complex of 5' FAMTM-labeled oligonucleotide (SEQ ID NO: l) and 3' Quencher labeled oligonucleotide (SEQ ID NO:2)), HEXTM-specific cassette (complex of 5' HEXTM-labeled oligonucleotide (SEQ ID NO:3) and 3' Quencher labeled oligonucleotide (SEQ ID NO:4)), Taq polymerase, buffer, and passive reference dye ROXTM, 60 ng of DNA from either H10 (two different samples, Al l and A12) or TM1, 0.224 ⁇ each of primer pair 2A11
  • the reaction was heated to 94°C for 15 minutes, then run for 10 cycles of 94°C for 20 seconds and 65°C for 60 seconds (dropping 0.6°C per cycle), and then run for 26, 28 or 30 cycles (see Table 1) of 94°C for 20 seconds and 57°C for 60 seconds. Fluorescence of the sample was then determined using a PHERAstar plate reader (scanner) (BMG Labtech; Ortenburg, Germany). Results are summarized in Table 1 and shown in Figure 1.
  • X/N is the luminance ratio of FAMTM/ROXTM
  • Y/N is the luminance ratio of HEXTM/ROXTM
  • X/Y is the ratio [(X/N)/(median of X/N values)] / [(Y/N)/(median of Y/N values)]
  • Difference From Baseline is X/Y - [0.9 x minimum (X/Y) value for respective set samples (column)]
  • Ratio to TMl is [Difference from Baseline for SAMPLE] / [Mean Difference from Baseline for TM-1].
  • the euploid TM-1 served as a reference genotype, and was compared to H10, which is monosomic for chromosome- 10 (only one copy of that chromosome, but two copies of all other chromosomes, including chromosome-20).
  • the relative dosage of the genomic sequence amplified by PCR was gauged by using FAM and HEX fluorescence that correlates to the relative amounts of PCR-based amplification from a primer set that amplifies a chromosome- 10 genomic sequence, versus a primer set that amplifies a chromosome-20 genomic sequence.
  • TM-1 and H10 do NOT differ in dosage for the targeted reference chromosome-20 genomic sequence, they do differ two-fold for the targeted chromosome- 10 genomic sequence.
  • Gossypium hirsutum L. (one copy of chromosome-10 and two copies of chromosome-20 per cell), was compared to the relative copy number of chromosome-10 in the TM1 control (two copies of chromosome-10 and two copies of chromosome-20 per cell).
  • Chromosome-20 was used as a reference point for both sets of samples, and the ratio of FAM/HEX fluorescence signals from PCR amplification of the chromosome-10 and -20 loci was used to evaluate the H10 and TM-1 genotypes.
  • Reactions were set up with DNA extracted from leaf tissue from the H10 or TM-1 plants using the NucleoSpin® Plant II Kit (MACHERY-NAGEL GmbH & Co. KG); at least two blanks were used as non-template controls.
  • the reactions contained lx KASP Master Mix (LGC, Limited), which contains the FAMTM-specific cassette (complex of 5' FAM-labeled oligonucleotide (SEQ ID NO: l) and 3' Quencher labeled oligonucleotide (SEQ ID NO:2)), HEXTM-specific cassette (complex of 5' HEX-labeled oligonucleotide (SEQ ID NO:3) and 3' Quencher labeled oligonucleotide (SEQ ID NO:4)), Taq polymerase, buffer, and passive reference dye ROXTM, 60 ng of DNA from either H10 (two different samples, Al l and A12) or TM1, 0.224 ⁇ each of primer pair 2E
  • the reaction was heated to 94°C for 15 minutes, then run for 10 cycles of 94°C for 20 seconds and 65°C for 60 seconds (dropping 0.6°C per cycle), and then run for 28 or 30 cycles (see Table 2) of 94°C for 20 seconds and 57°C for 60 seconds. Fluorescence of the sample was then determined using a PHERAstar plate reader (scanner) (BMG Labtech; Ortenburg, Germany). Results are summarized in Table 2 and shown in Figure 2.
  • X/N is the luminance ratio of FAMTM/ROXTM
  • Y/N is the luminance ratio of HEXTM/ROXTM
  • X/Y is the ratio [(X/N)/(median of X/N values)] / [(Y/N)/(median of Y/N values)]
  • Difference From Baseline is X/Y - [0.9 x minimum (X/Y) value for respective set samples (column)]
  • Ratio to TMl is [Difference from Baseline for SAMPLE] / [Mean Difference from Baseline for TM-1].
  • the euploid TM-1 served as a reference genotype, and was compared to Hl l, which is monosomic for chromosome- 11 (only one copy of that chromosome, but two copies of all other chromosomes, including chromosome-20).
  • the relative dosage of the genomic sequence amplified by PCR was gauged by using FAM and HEX fluorescence that correlates to the relative amounts of PCR-based amplification from a primer set that amplifies a chromosome- 11 genomic sequence, versus a primer set that amplifies a chromosome-20 genomic sequence.
  • TM-1 and Hl l do NOT differ in dosage for the targeted reference chromosome-20 genomic sequence, they do differ two-fold for the targeted chromosome- 11 genomic sequence.
  • the relative copy number of a chromosome-11 locus in the Hl l monosomic stock of Gossypium hirsutum L. was compared to the relative copy number of chromosome-11 in the TMl control (two copies of chromosome-11 and two copies of chromosome-20 per cell).
  • Chromosome-20 was used as a reference point for both sets of samples, and the ratio of FAM/HEX fluorescence signals from PCR amplification of the chromosome- 11 and -20 loci was used to evaluate the Hl l and TM-1 genotypes.
  • Reactions were set up with DNA extracted from leaf tissue from the Hl l or TM-1 plants using the NucleoSpin® Plant II Kit (MACHERY-NAGEL GmbH & Co. KG); at least two blanks were used as non-template controls.
  • the reaction was heated to 94°C for 15 minutes, then run for 10 cycles of 94°C for 20 seconds and 65°C for 60 seconds (dropping 0.6°C per cycle), and then run for 28 or 30 cycles (see Table 3) of 94°C for 20 seconds and 57°C for 60 seconds. Fluorescence of the sample was then determined using a PHERAstar plate reader (scanner) (BMG Labtech; Ortenburg, Germany). Results are summarized in Table 3 and shown in Figure 3.
  • X/N is the luminance ratio of FAMTM/ROXTM
  • Y/N is the luminance ratio of HEXTM/ROXTM
  • X/Y is the ratio [(X/N)/(median of X/N values)] / [(Y/N)/(median of Y/N values)]
  • Difference From Baseline is X/Y - [0.9 x minimum (X/Y) value for respective set samples (column)]
  • Ratio to TM1 is [Difference from Baseline for SAMPLE] / [Mean Difference from Baseline for TM-1].
  • the euploid TM-1 served as a reference genotype, and was compared to H20, which is monosomic for chromosome-20 (only one copy of that chromosome, but two copies of all other chromosomes, including chromosome-10).
  • the relative dosage of the genomic sequence amplified by PCR was gauged by using FAM and HEX fluorescence that correlates to the relative amounts of PCR-based amplification from a primer set that amplifies a chromosome-20 genomic sequence, versus a primer set that amplifies a chromosome-10 genomic sequence.
  • TM-1 and H20 do NOT differ in dosage for the targeted reference chromosome-10 genomic sequence, they do differ two-fold for the targeted chromosome-20 genomic sequence.
  • the relative copy number of a chromosome-20 locus in the H20 monosomic stock of Gossypium hirsutum L. was compared to the relative copy number of chromosome-20 in the TM1 control (two copies of chromosome-20 and two copies of chromosome-10 per cell).
  • Chromosome-10 was used as a reference point for both sets of samples, and the ratio of FAM/HEX fluorescence signals from PCR amplification of the chromosome-20 and -10 loci was used to evaluate the H20 and TM-1 genotypes.
  • Reactions were set up with DNA extracted from leaf tissue from the H20 or TM-1 plants using the NucleoSpin® Plant II Kit (MACHERY-NAGEL GmbH & Co. KG); at least two blanks were used as non-template controls.
  • the reactions contained lx KASP Master Mix (LGC, Limited), which contains the FAMTM-specific cassette (complex of 5' FAMTM-labeled oligonucleotide (SEQ ID NO: l) and 3' Quencher labeled oligonucleotide (SEQ ID NO:2)), HEXTM-specific cassette (complex of 5' HEXTM-labeled oligonucleotide (SEQ ID NO:3) and 3' Quencher labeled oligonucleotide (SEQ ID NO:4)), Taq polymerase, buffer, and passive reference dye ROXTM, 60 ng of DNA from either H20 (four different samples, 1408012.05, 1408012.06, 1408012.07, and 1408012.
  • the reaction was heated to 94°C for 15 minutes, then run for 10 cycles of 94°C for 20 seconds and 65°C for 60 seconds (dropping 0.6°C per cycle), and then run for 26 or 30 cycles (see Table 4) of 94°C for 20 seconds and 57°C for 60 seconds. Fluorescence of the sample was then determined using a PHERAstar plate reader (scanner) (BMG Labtech; Ortenburg, Germany). Results are summarized in Table 4 and shown in Figure 4.
  • X/N is the luminance ratio of FAMTM/ROXTM
  • Y/N is the luminance ratio of HEXTM/ROXTM
  • X/Y is the ratio [(X/N)/(median of X/N values)] / [(Y/N)/(median of Y/N values)]
  • Difference From Baseline is X/Y - [0.9 x minimum (X/Y) value for respective set samples (column)]
  • Ratio to TMl is [Difference from Baseline for SAMPLE] / [Mean Difference from Baseline for TM-1].
  • the euploid TM-1 served as a reference genotype, and was compared to H20, which is monosomic for chromosome-20 (only one copy of that chromosome, but two copies of all other chromosomes, including chromosome-11).
  • the relative dosage of the genomic sequence amplified by PCR was gauged by using FAM and HEX fluorescence that correlates to the relative amounts of PCR-based amplification from a primer set that amplifies a chromosome-20 genomic sequence, versus a primer set that amplifies a chromosome-11 genomic sequence.
  • TM-1 and H20 do NOT differ in dosage for the targeted reference chromosome-11 genomic sequence, they do differ two-fold for the targeted chromosome-20 genomic sequence.
  • the relative copy number of a chromosome-20 locus in the H20 monosomic stock of Gossypium hirsutum L. was compared to the relative copy number of chromosome-20 in the TM1 control (two copies of chromosome-20 and two copies of chromosome-11 per cell).
  • Chromosome-11 was used as a reference point for both sets of samples, and the ratio of FAM/HEX fluorescence signals from PCR amplification of the chromosome-20 and -11 loci was used to evaluate the H20 and TM-1 genotypes.
  • Reactions were set up with DNA extracted from leaf tissue from the H20 or TM-1 plants using the NucleoSpin® Plant II Kit (MACHERY-NAGEL GmbH & Co. KG); at least two blanks were used as non-template controls.
  • the reactions contained lx KASP Master Mix (LGC, Limited), which contains the F AMTM- specific cassette (complex of 5' FAMTM-labeled oligonucleotide (SEQ ID NO: l) and 3' Quencher labeled oligonucleotide (SEQ ID NO:2)), HEXTM-specific cassette (complex of 5' HEXTM-labeled oligonucleotide (SEQ ID NO:3) and 3' Quencher labeled oligonucleotide (SEQ ID NO:4)), Taq polymerase, buffer, and passive reference dye ROXTM, 60 ng of DNA from either H20 (four different samples, 1408012.05, 1408012.06, 1408012.07, and 1408012.
  • the reaction was heated to 94°C for 15 minutes, then run for 10 cycles of 94°C for 20 seconds and 65°C for 60 seconds (dropping 0.6°C per cycle), and then run for 26 or 28 cycles (see Table 5) of 94°C for 20 seconds and 57 °C for 60 seconds. Fluorescence of the sample was then determined using a PHERAstar plate reader (scanner) (BMG Labtech; Ortenburg, Germany). Results are summarized in Table 5 and shown in Figure 5.
  • X/N is the luminance ratio of FAMTM/ROXTM
  • Y/N is the luminance ratio of HEXTM/ROXTM
  • X/Y is the ratio [(X/N)/(median of X/N values)] / [(Y/N)/(median of Y/N values)]
  • Difference From Baseline is X/Y - [0.9 x minimum (X/Y) value for respective set samples (column)]
  • Ratio to TMl is [Difference from Baseline for SAMPLE] / [Mean Difference from Baseline for TM- 1] .
  • Ubiquitin-conjugating enzyme (UBC1) is present in a single-copy per haploid cotton ⁇ Gossypium hirsutum L.) genome, making it a suitable standardized reference (Yi, et ah, Analytical Biochem. 375: 150-152, 2008).
  • SAD1 gene can be used as reference in cotton (Yang, et al., Plant Cell Rep. 24:237-245, 2005).
  • a pair of DNA primers (forward and reverse) were designed for targeted PCR-based amplification of a small genomic DNA sequence that is contained within or equates to the borders of a known, putative or possible copy number variant.
  • a DNA sequence "Tag” was added corresponding to the FAM/X fluorochrome labeled DNA sequence in the KASP master-mix (KASP MM), such that PCR-based amplification of sample DNA using the "tagged" primer(s) leads to incorporation of the tagged sequence into the PCR product (amplicon) and de-quenching of the FAM fluorochrome, resulting in FAM fluorescence.
  • the primers were designed for sequences within UBC1, and tested them to identify combination(s) of forward and reverse primers that consistently yielded good amplification of the target sequence and no self-amplification. These were labeled with a sequence corresponding to the HEX/Y fluorochrome in the master-mix.
  • FAM and HEX are to be used to detect amplification of the Target (FAM signal) versus Reference (HEX signal); these roles can be easily reversed by swapping the use of their respective DNA sequence "Tags" in the locus -specific primers (Target and Reference). While the commercial availability of KASP MM facilitates implementation of these assays, successful implementation of these methods of CNV detection is not relegated to the specific tag DNA sequences or tag fluorochromes available in commercially vended KASP MM.
  • the CLA implementation can utilize fluorochrome- specific tagging of the forward and/or reverse allele- specific primers.
  • the CLA assay e.g. , for detection of relatively large CN differences or presence or copy number of transgene sequences, is more flexible than the KASP assay commonly applied to SNP detection.
  • Fluorescence data is measured at each cycle for each well. Optimal cycling conditions are determined experimentally as these vary with different primer sets, sample quality, minor variations in starting material, etc. Typically, data collection begins at 24 cycles and ends at 40 cycles. This consists of three measurements: FAM or X (485 nm) corresponding to target primer amplification; HEX or Y (535 nm) corresponding to reference primer amplification; and ROX or N (575 nm) a passive reference dye for normalizing expression between wells. The normalized value for X and Y is that value divided by the fluorescence for ROX (X/N and Y/N).
  • a threshold value is set in relation to a no template control (NTC), a reaction mixture in which ddH 2 0 has been added to the reaction components in place of a DNA template. Any expression at or below the NTC indicates amplification has not yet occurred at a measurable level, and such a signal is considered mere noise.
  • NTC no template control
  • the threshold is set to be 1.1-1.4 times the NTC value for each dye, a value that is experimentally determined. Useful data can be obtained from samples during cycles where the level of expression is consistently above the NTC and steadily increases (amplifies) from one cycle to another.
  • results of a dilution series test for using one target primer set is shown in FIG. 6.
  • the normalization protocol ⁇ i.e., thresholds and baseline) was established to optimize the fit between the experimentally observed and expected (line).
  • the corresponding euploid TMl genetic/cyto genetic standard and chromosome-11 monosomic aneuploids (“Hl l") were analyzed to determine where they fell relative to the synthetic gBlock dilutions; for example, the signal ratio from Hl l versus TMl plants for unique sequences in chromosome-11 would be expected to be similar to that of "gBlock" ratio 1:2).
  • the results are shown in FIG. 7.
  • the bottom line indicates the median value for the 1:2 "gBlock” dilution.
  • the Hl l samples represent three chromosome-11 monosomic aneuploids ("Hl l") assayed. They all fall closer to the 1:2 "gBlock” dilution than to either the 1:4 or 3:4. So this indicates a successful assay for this target.
  • TMl was also assessed and aligned with the 1: 1 control "gBlock" as expected.
  • sample template DNA biological gDNA
  • concentration of a sample of the DNA was adjusted to 20 ng/ ⁇ , based on DeNovix® DS-11 fluorometric analysis, and that 20 ng/ ⁇ sample was then diluted and quantified to create a range of concentrations (10, 5 and 2.5 ng/ ⁇ ). The results are shown in FIG. 8.
  • the results of various tests against known aneuploids are provided (FIG. 9 to FIG. 15).
  • the Y-axis is normalized relative fluorescence. It is normalized based on the threshold value described above. It is then set relative to the control (TMl) such that the median value for the TMl fluorescence will always be 1.0. All individuals were assessed in triplicate using as many individuals as were available for that particular aneuploid family.
  • the horizontal bottom line corresponds to the median value of the aneuploids assessed; the horizontal top line corresponds to the median for TMl (1.0).
  • the universal reference used was UBC1, except for FIG. 13, which used SAD1 as the universal reference.
  • Target primers correspond to a sequenced region of the chromosome listed in the title.
  • the x-axis are sample names: "H#" indicates the aneuploid line with # indicating the monoploid chromosome.
  • the TMl standard is always given last, on the far right as “TMl,” a euploid standard of cotton (Gossypium hirsutum L.).
  • TMl a euploid standard of cotton
  • Some assay exhibit greater variability than others, but this could be due to human error. However, all assays presented were able to discern the CN variant (aneuploid) from the standard (two-tail t-test unequal variance: p ⁇ 0.01).
  • One application of the presently described CLA analysis is to screen transgenic or gene- edited (e.g., with single-base changes) germplasm for CN of the alien insert. While it is easy to test for the presence/absence of transgenic material using conventional PCR, it is much more difficult to discern individuals with a single copy of the transgenic sequence from those with multiple copies or fragments. It is relatively expensive to use commercially vended test strips, and these may not be applicable to newly created transgenes or gene-edited products. DNA was acquired from two transformed lines; one contains a single copy of the transgene, the other contains a single complete copy plus an additional fragment. For a control, these were analyzed relative to the G. hirsutum line (Coker 312) from which they were derived. FIG.
  • FIG. 16 and FIG. 17 show the results of a control when the alien insert is present in the same copy number for both transformed lines
  • FIG. 18 and FIG. 19 show the results of a control for the alien insert with copy number differences between the transformed lines due to the presence of an insert fragment
  • FIG. 20 and FIG. 21 show the results of the Gossypium insert with a copy number difference between transformed lines and the Coker control.
  • compositions and/or methods disclosed and claimed herein can be made and executed without undue experimentation in light of the present disclosure. While the compositions and methods of this invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations may be applied to the compositions and/or methods and in the steps or in the sequence of steps of the method described herein without departing from the concept, spirit and scope of the invention. More specifically, it will be apparent that certain agents that are both chemically and physiologically related may be substituted for the agents described herein while the same or similar results would be achieved. All such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and concept of the invention as defined by the appended claims.

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Abstract

L'invention concerne un procédé rapide, précis, sensible et économique permettant de déterminer le nombre relatif de copies d'une séquence nucléotidique dans un échantillon biologique. Le procédé implique l'analyse quantitative d'un marqueur fluorescent dans un échantillon d'essai, et d'un marqueur fluorescent différent dans un échantillon témoin (de référence). La comparaison de la quantité de fluorescence entre les deux échantillons fournit le nombre relatif de copies de la séquence nucléotidique dans l'échantillon d'essai, et peut par conséquent être utilisée pour déterminer la variation du nombre de copies.
PCT/US2017/012298 2016-01-05 2017-01-05 Amplification comparative de locus pour déterminer un nombre de copies WO2017120309A1 (fr)

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CN110373477A (zh) * 2019-07-23 2019-10-25 华中农业大学 克隆自cnv片段的与猪耳形性状相关的分子标记
CN110964839A (zh) * 2020-01-03 2020-04-07 西北农林科技大学 一种serpina3-1基因cnv标记辅助检测黄牛生长性状的方法及其应用
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CN108866210B (zh) * 2018-08-31 2021-03-16 华中农业大学 与20日龄仔猪红细胞数目相关的分子标记及其应用
CN108950021A (zh) * 2018-08-31 2018-12-07 华中农业大学 猪9号染色体基因间区单核苷酸多态作为猪红细胞数目性状的分子标记
CN108998543A (zh) * 2018-08-31 2018-12-14 华中农业大学 一种与猪红细胞数目性状相关的snp分子标记
CN108998543B (zh) * 2018-08-31 2021-03-16 华中农业大学 一种与猪红细胞数目性状相关的snp分子标记
CN108866211A (zh) * 2018-08-31 2018-11-23 华中农业大学 一种影响猪红细胞数目的snp分子标记
CN108866210A (zh) * 2018-08-31 2018-11-23 华中农业大学 与20日龄仔猪红细胞数目相关的分子标记及其应用
CN108866211B (zh) * 2018-08-31 2021-02-02 华中农业大学 一种影响猪红细胞数目的snp分子标记
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CN110964838B (zh) * 2020-01-03 2022-07-22 西北农林科技大学 一种快速检测绵羊lrrfip1基因cnv标记的方法及其应用
CN115927669A (zh) * 2022-12-19 2023-04-07 中国农业科学院兰州畜牧与兽药研究所 一种与高山美利奴羊羊毛性状相关的cnv标记的方法及应用
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