Assay systems for genetic analysis
First Claim
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1. A method for detecting a fetal copy number variation in a maternal plasma or serum sample comprising fetal and maternal cell-free DNA, the method comprising:
- (a) obtaining the maternal plasma or serum sample comprising fetal and maternal cell-free DNA;
(b) hybridizing (i) a first set of at least 24 and less than 2000 pairs of fixed sequence oligonucleotides with (ii) the fetal and maternal cell-free DNA in the maternal plasma or serum sample, wherein the percent fetal DNA is less than 25% of the sample, wherein the oligonucleotides of each pair are complementary to regions flanking a non-polymorphic locus within a first chromosome or a portion of the first chromosome, and wherein the melting temperatures (Tms) of first fixed sequence oligonucleotides of each of the pairs of the first set vary in a range of two degrees centigrade;
(c) hybridizing (i) a second set of at least 24 and less than 2000 pairs of fixed sequence oligonucleotides with (ii) the fetal and maternal cell-free DNA in the maternal plasma or serum sample, wherein the percent fetal DNA is less than 25% of the sample, wherein the oligonucleotides of each pair are complementary to regions flanking a non-polymorphic locus within a second chromosome or a portion of the second chromosome and wherein the Tms of first fixed sequence oligonucleotides of each of the pairs of the second set vary in a range of two degrees centigrade;
(d) extending the regions between the hybridized oligonucleotides of the first and second sets of fixed sequence oligonucleotide pairs with a polymerase and dNTPs to create hybridized adjacent extended oligonucleotides spanning the non-polymorphic loci in the first and second nucleic acid regions of interest;
(e) ligating the hybridized adjacent extended oligonucleotides to produce ligation products;
(f) amplifying the ligation products to produce amplification products, wherein an average number of amplification products per locus is greater than 100;
(g) detecting the amplification products at least an average of 100 times to count the relative frequency of each non-polymorphic locus within the first and second nucleic acid regions of interest; and
(h) detecting a fetal copy number variation of the first nucleic acid region of interest in the maternal serum or plasma sample relative to the second nucleic acid region of interest.
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Abstract
The present invention provides assays systems and methods for detection of chromosomal abnormalities and status of single loci associated with monogenic or polygenic traits in a sample containing nucleic acids from a maternal and a fetal source.
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Citations
24 Claims
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1. A method for detecting a fetal copy number variation in a maternal plasma or serum sample comprising fetal and maternal cell-free DNA, the method comprising:
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(a) obtaining the maternal plasma or serum sample comprising fetal and maternal cell-free DNA; (b) hybridizing (i) a first set of at least 24 and less than 2000 pairs of fixed sequence oligonucleotides with (ii) the fetal and maternal cell-free DNA in the maternal plasma or serum sample, wherein the percent fetal DNA is less than 25% of the sample, wherein the oligonucleotides of each pair are complementary to regions flanking a non-polymorphic locus within a first chromosome or a portion of the first chromosome, and wherein the melting temperatures (Tms) of first fixed sequence oligonucleotides of each of the pairs of the first set vary in a range of two degrees centigrade; (c) hybridizing (i) a second set of at least 24 and less than 2000 pairs of fixed sequence oligonucleotides with (ii) the fetal and maternal cell-free DNA in the maternal plasma or serum sample, wherein the percent fetal DNA is less than 25% of the sample, wherein the oligonucleotides of each pair are complementary to regions flanking a non-polymorphic locus within a second chromosome or a portion of the second chromosome and wherein the Tms of first fixed sequence oligonucleotides of each of the pairs of the second set vary in a range of two degrees centigrade; (d) extending the regions between the hybridized oligonucleotides of the first and second sets of fixed sequence oligonucleotide pairs with a polymerase and dNTPs to create hybridized adjacent extended oligonucleotides spanning the non-polymorphic loci in the first and second nucleic acid regions of interest; (e) ligating the hybridized adjacent extended oligonucleotides to produce ligation products; (f) amplifying the ligation products to produce amplification products, wherein an average number of amplification products per locus is greater than 100; (g) detecting the amplification products at least an average of 100 times to count the relative frequency of each non-polymorphic locus within the first and second nucleic acid regions of interest; and (h) detecting a fetal copy number variation of the first nucleic acid region of interest in the maternal serum or plasma sample relative to the second nucleic acid region of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for detecting a fetal chromosomal aneuploidy of a first chromosome in a maternal plasma or serum sample comprising fetal and maternal cell-free DNA, the method comprising:
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(a) obtaining the maternal plasma or serum sample comprising fetal and maternal cell-free DNA; (b) hybridizing (i) a first set of at least 24 and less than 2000 pairs of fixed sequence oligonucleotides with (ii) the fetal and maternal cell-free DNA in the maternal plasma or serum sample, wherein the percent fetal DNA is less than 25% of the sample, wherein the oligonucleotides of each pair are complementary to regions flanking a non-polymorphic locus within a first chromosome or a portion of the first chromosome, and wherein the melting temperatures (Tms) of first fixed sequence oligonucleotides of each of the pairs of the first set vary in a range of two degrees centigrade; (c) hybridizing (i) a second set of at least 24 and less than 2000 pairs of fixed sequence oligonucleotides with (ii) the fetal and maternal cell-free DNA in the maternal plasma or serum sample, wherein the percent fetal DNA is less than 25% of the sample, wherein the oligonucleotides of each pair are complementary to regions flanking a non-polymorphic locus within a second chromosome or a portion of the second chromosome and wherein the Tms of first fixed sequence oligonucleotides of each of the pairs of the second set vary in a range of two degrees centigrade; (d) extending the regions between the hybridized oligonucleotides of the first and second sets of fixed sequence oligonucleotide pairs with a polymerase and dNTPs to create hybridized adjacent extended oligonucleotides spanning the non-polymorphic loci in the first and second chromosomes of interest; (e) ligating the hybridized adjacent extended oligonucleotides to produce ligation products; (f) amplifying the ligation products to produce amplification products, wherein an average number of amplification products per locus is greater than 100; (g) detecting the amplification products at least an average of 100 times to count the relative frequency of each non-polymorphic locus within the first and second chromosomes of interest; and (h) detecting a fetal chromosomal aneuploidy of the first chromosome in the maternal serum or plasma sample if the relative frequencies of the first and second chromosome of interest vary statistically. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for detecting a fetal chromosomal aneuploidy of a first chromosome in a maternal plasma or serum sample comprising fetal and maternal cell-free DNA, the method comprising:
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(a) obtaining the maternal plasma or serum sample comprising fetal and maternal cell-free DNA; (b) hybridizing (i) a first set of at least 24 and less than 2000 pairs of fixed sequence oligonucleotides with (ii) the fetal and maternal cell-free DNA in the maternal plasma or serum sample, wherein the percent fetal DNA is less than 25% of the sample, wherein the oligonucleotides of each pair are complementary to regions flanking a non-polymorphic locus within a first chromosome or a portion of the first chromosome, wherein the melting temperatures (Tms) of first fixed sequence oligonucleotides of each of the pairs of the first set vary in a range of two degrees centigrade, and wherein at least one of the fixed sequence oligonucleotides in each pair of the first set of fixed sequence oligonucleotides comprises a locus index; (c) hybridizing (i) a second set of at least 24 and less than 2000 pairs of fixed sequence oligonucleotides with (ii) the fetal and maternal cell-free DNA in the maternal plasma or serum sample, wherein the percent fetal DNA is less than 25% of the sample, wherein the oligonucleotides of each pair are complementary to regions flanking a non-polymorphic locus within a second chromosome or a portion of the second chromosome, wherein the Tms of first fixed sequence oligonucleotides of each of the pairs of the second set vary in a range of two degrees centigrade, and wherein at least one of the fixed sequence oligonucleotides in each pair of the second set of fixed sequence oligonucleotides comprises a locus index; (d) extending the regions between the hybridized oligonucleotides of the first and second sets of fixed sequence oligonucleotide pairs with a polymerase and dNTPs to create hybridized adjacent extended oligonucleotides spanning the non-polymorphic loci in the first and second chromosomes of interest; (e) ligating the hybridized adjacent extended oligonucleotides to produce ligation products; (f) amplifying the ligation products to produce amplification products, wherein an average number of amplification products per locus is greater than 100; (g) detecting the amplification products at least an average of 100 times to count the relative frequency of each non-polymorphic locus within the first and second chromosomes of interest; and (h) detecting a fetal chromosomal aneuploidy of the first chromosome in the maternal serum or plasma sample if the relative frequencies of the first and second chromosome of interest vary statistically. - View Dependent Claims (23, 24)
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Specification