摘要:
This disclosure provides, inter alia, a probe system probe system for analyzing a nucleic acid sample. In some embodiments, the probe system may comprise: a set of identifier oligonucleotides of sequence B, a set of splint oligonucleotides of formula X'-A'-B'-Z', wherein sequence A' is complementary to a genomic fragment and sequence B' is complementary to at least one member of the set of identifier oligonucleotides, and one or more probe sequences comprising X and Z. Each splint oligonucleotide is capable of hybridizing to the probe sequences, a member of the set of identifier oligonucleotides and a genomic fragment, thereby producing a ligatable complex of formula X-A-B-Z. The probe system can be used to identify a chromosome aneuploidy in cell free DNA, for example.
摘要:
The present teachings describe a method for determining the presence or absence of a fetal chromosomal aneuploidy in a pregnant female, the method comprising the calculation of a parameter p from sequences obtained from a biological sample from said pregnant female. The present teachings equally provide a method for determining the fetal fraction of said sample.
摘要:
Zum Bestimmen einer relativen Häufigkeit von verschiedenen Genen und/oder Chromosomen eines Genoms, von dem DNS in einer Probe stammt, werden in einem gemeinsamen Verstärkungsschritt mindestens ein spezifischer Abschnitt (13-1 bis 21 -14) der DNS von jedem der verschiedenen Gene und/oder Chromosome verstärkt, wobei die verstärkten spezifischen Abschnitte (13-1 bis 21-4) der DNS jeweils eine feste Länge aufweisen. Der mindestens eine verstärkte spezifische Abschnitt (13-1 bis 21-4) der DNS von jedem der verschiedenen Gene und/oder Chromosome wird mit einem Lumineszenzmarker markiert wird. Die verstärkten spezifischen Abschnitte (18-1 bis 21-4) der DNS von den verschiedenen Genen und/oder Chromosomen werden durch Elektrophorese getrennt. Eine Lichtmenge des Lumineszenzlichts von dem Lumineszenzmarker wird für die DNS von jedem der verschiedenen Gene und/oder Chromosome getrennt gemessen; und die relative Häufigkeit der verschiedenen Gene und/oder Chromosome des Genoms wird aus Verhältnissen der für die DNS von jedem der verschiedenen Gene und/oder Chromosome getrennt gemessenen Lichtmengen bestimmt.
摘要:
Methods and assay processes are described herein for identifying and treating subjects who have or will have dysfunction or rejection of a kidney transplant. The methods and assay procedures are noninvasive.
摘要:
Disclosed are methods for determining copy number variation (CNV) known or suspected to be associated with a variety of medical conditions. In some embodiments, methods are provided for determining copy number variation (CNV) of fetuses using maternal samples comprising maternal and fetal cell free DNA. In some embodiments, methods are provided for determining CNVs known or suspected to be associated with a variety of medical conditions. Some embodiments disclosed herein provide methods to improve the sensitivity and/or specificity of sequence data analysis by deriving a fragment size parameter, such as a size-weighted coverage or a fraction of fragments in a size range. In some embodiments, the fragment size parameter is adjusted to remove within-sample GC-content bias. In some embodiments, removal of within-sample GC-content bias is based on sequence data corrected for systematic variation common across unaffected training samples. Also disclosed are systems and computer program products for evaluation of CNV of sequences of interest.
摘要:
Provided herein are methods for determining ploidy of an embryo. The methods can include the steps of amplifying, using a primer pair that amplifies a plurality of human genomic loci, nucleic acid from a preimplantation embryo to generate a plurality of amplicons, sequencing the amplicons to generate a plurality of sequence reads, matching the sequence reads to the genomic loci and counting a number of matches, and determining chromosome count based on the number of matches. Also provided herein are systems for determining chromosome count comprising a processor coupled to a tangible memory subsystem storing instructions. When executed by the processor, the instructions cause the system to implement the methods provided.
摘要:
Described herein are methods, primers, probes and kits useful in the prenatal detection of undesirable genetic abnormalities in an unborn fetus, such as aneuploidies. The methods render possible the detection of the genetic abnormalities in the unborn fetus without having to sequence fetal DNA but instead by measuring accurately in maternal plasma levels of free fetal DNA corresponding to the genetic abnormality. The measuring comprises amplifying free fetal DNA from two different regions (DNA associated to the abnormality and DNA associated to a reference gene) and, though calculations and statistics, obtaining a relative ratio of abundance for free fetal DNA corresponding to the genetic abnormality. This relative ratio of abundance is indicative of presence or absence of the predefined genetic abnormality to be detected. In one embodiment, the amplifying comprises employing a droplet digital PCR (ddPCR).
摘要:
The present invention pertains to micro RNAs (miR) regulating the expression of blood group antigens such as A, B, Rhesus or Kell. The miRs of the invention were found to directly target glycosyltransferases, enzymes which are responsible for the generation of the glycosylation patterns that are characteristic for a given blood type. The invention provides methods which harness miR expression-constructs for the generation of erythrocytes with a reduced expression of blood group antigens. Further provided are: erythrocytes produced with the methods of the invention, and a blood preparation suitable in transfusion medicine comprising the erythrocytes of the invention. The invention additionally relates to a method for diagnosing blood group antigen suppression in a subject, the method comprising the detection of the copy-number of the miR target sites in the genetic loci encoding glycosyltransferases and other blood group receptors.
摘要:
Technology described herein pertains in part to diagnostic tests that make use of sequence reads generated by a sequencing process. In some embodiments, a component used to generate a chromosome representation can be based on counts of sequence reads not aligned to a reference genome.
摘要:
Single-stranded oligonucleotide probes, systems, kits and methods for chromosome enumeration, gene copy enumeration, or tissue diagnostics. The probes are particularly suited for detecting gene amplification, deletion, or rearrangement in tissue samples in a single, dual, or multiplexed assay. The probes exhibit improved performance compared to industry leading dual-stranded probes; particularly in terms of the rate of hybridization.