Processes and compositions for methylation-based acid enrichment of fetal nucleic acid from a maternal sample useful for non-invasive prenatal diagnoses
First Claim
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1. A method for determining the presence or absence of a fetal aneuploidy comprising:
- a) digesting nucleic acid from a pregnant female, which nucleic acid comprises fetal nucleic acid and maternal nucleic acid, with a methylation sensitive restriction enzyme that specifically digests non-methylated maternal nucleic acid at a plurality of loci, wherein the plurality of loci comprises the locus of SEQ ID NO;
38, thereby enriching the fetal nucleic acid;
b) determining the amount of fetal nucleic acid from a target chromosome;
c) determining the amount of fetal nucleic acid from a reference chromosome and;
d) comparing the amount of fetal nucleic acid determined in step (b) to the amount of fetal nucleic acid determined in step (c), whereby a statistically significant difference between the amount of fetal nucleic acid determined in step (b) and the amount of fetal nucleic acid determined in step (c) determines the presence of a fetal aneuploidy.
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Abstract
Provided are compositions and processes that utilize genomic regions differentially methylated between a mother and her fetus to separate, isolate or enrich fetal nucleic acid from a maternal sample. The compositions and processes described herein are useful for non-invasive prenatal diagnostics, including the detection of chromosomal aneuplodies.
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20 Claims
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1. A method for determining the presence or absence of a fetal aneuploidy comprising:
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a) digesting nucleic acid from a pregnant female, which nucleic acid comprises fetal nucleic acid and maternal nucleic acid, with a methylation sensitive restriction enzyme that specifically digests non-methylated maternal nucleic acid at a plurality of loci, wherein the plurality of loci comprises the locus of SEQ ID NO;
38, thereby enriching the fetal nucleic acid;b) determining the amount of fetal nucleic acid from a target chromosome; c) determining the amount of fetal nucleic acid from a reference chromosome and; d) comparing the amount of fetal nucleic acid determined in step (b) to the amount of fetal nucleic acid determined in step (c), whereby a statistically significant difference between the amount of fetal nucleic acid determined in step (b) and the amount of fetal nucleic acid determined in step (c) determines the presence of a fetal aneuploidy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification