Abstract:
The present invention relates to the field of PCR amplification and labeling, and genetic analysis. The present invention allows amplification and labeling of DNA fragments simultaneously in one amplification reaction and based on the use of at least a pair of primers including a tail at the 5'-end, and a pair of primers comprising the total or partial sequence of one tail, and wherein at least one of the second pair of primers is labeled. The procedure is developed in a single PCR reaction. The invention is also related to kits for nucleic acid amplification, labeling and detection, and to the use of said kits in applications such as genetic diagnosis.
Abstract:
Provided herein are methods and compositions for reducing probe count variability of a biological sample. After obtaining a biological sample, such as a saliva sample, the sample is pretreated with a lysis buffer that includes a detergent to form an extraction solution. Nucleic acids are isolated from the extraction solution and fragmented into polynucleotide fragments, which are then mixed with homologous capture probes, which, for example, are bound to a flow cell of a direct targeted sequencing system. The capture probes bind to targeted sequences of the polynucleotide fragments, thereby capturing the targeted polynucleotide fragments. Based on binding of polynucleotides fragments to the homologous capture probes, a probe count is determined for the homologous probes. By mixing the lysis buffer with the biological sample to form the extraction solution, variability of the determined probe count is substantially reduced.
Abstract:
Disclosed here is a method for detecting genome rearrangement in a biological sample, comprising: obtaining a contact matrix plotted from proximity ligation sequencing data of at least one chromosome; identifying an abnormal contact pattern in the contact matrix compared to the contact matrix of a reference genome; comparing the abnormal contact pattern in the contact matrix to one or more known patterns associated with genomic rearrangement to identify a type of genomic rearrangement causing the abnormal contact pattern. Also disclosed is a method for detecting genome rearrangement in a biological sample, comprising: selecting linked chromosomal fragments from proximity ligation sequencing data of at least one chromosome, identifying an abnormal covalent bonding pattern of the linked chromosomal fragments compared to a reference genome; and comparing the abnormal covalent bonding pattern to one or more known patterns associated with genomic rearrangement to identify genomic rearrangement causing the abnormal covalent bonding pattern.
Abstract:
The invention relates to methods for labelling individual nucleic acid molecules present in a sample, comprising contacting the nucleic acid molecules with an adaptor or mixture of adaptors, wherein the adaptor or adaptors comprise one or more universal nucleotide bases and a ligation moiety at their 3' end, and ligating an adaptor to the nucleic acid of interest, wherein the adaptor is ligated to the nucleic acid molecules at the 3' end of the adaptor. A random tag is then generated in situ by conducting an extension reaction over the ligated adaptor. Methods of the invention may be used to detect genetic alterations or variants in any nucleic acid with high specificity and high sensitivity, including mutations in nucleic acids such as ctDNA, cfDNA, and in viral, microbiome and plant nucleic acids. Methods of the invention may also be used in detection and correction of errors introduced into nucleic acids during processing.
Abstract:
The invention relates to methods of utilizing epigenetic information to separate one type of DNA from a mixture of multiple DNAs. The applications of the methods of the invention include, for example, the detection of chromosomal abnormality (e.g., aneuploidy, cancer cells), identification of genome abnormality, direct detection of DNA with abnormal copy number and development of indicators for the above-mentioned detection and identification.
Abstract:
La présente invention porte sur un procédé de détermination de la présence et quantification d'au moins un micro-organisme dans un échantillon biologique humain comprenant des acides nucléiques totaux, comportant les étapes suivantes : - extraction des acides nucléiques totaux dudit échantillon biologique - séquençage haut débit desdits acides nucléiques totaux - traitement informatique des données de séquençage - le filtrage des séquences non humaines par alignement de séquences avec les séquences du génome de référence d'au moins un micro-organisme d'au moins un échantillon de référence - le calcul de la profondeur de séquençage du génome de référence d'au moins un micro-organisme - la détermination d'un indicateur de la quantification d'au moins un micro¬ organisme fonction de ladite profondeur de séquençage du génome de référence. La présente invention porte également sur un équipement et des kits pour la mise en œuvre dudit procédé, pour le diagnostic prénatal ou de cancers.
Abstract:
Methods for labeling and imaging the accessible genome using a transposase are disclosed. In some embodiments, a bifunctional transposase complex or transposome is used to insert adaptors comprising chemical tags selectively at accessible sites in the genome where active regulatory DNA is located. Various chemical tags can be used for labeling DNA at insertion sites, including, for example, fluorescent dyes for fluorescence imaging, metal particles for electron microscopy or magnetic manipulation of DNA, isotopic labels, or biotin or other ligands, haptens, substrates, or inhibitors that are recognized by streptavidin, antibodies, enzymes, or receptors. Labeling DNA in this manner can be used to provide spatial information regarding the positioning of regulatory DNA in the genome and makes possible the imaging and sorting of cells based on the status of their regulatory DNA.
Abstract:
The technology provided herein relates to novel methods for screening/detecting of plants, in particular by a multiplex PCR-based combined with a next-generation sequencing approach to analyze a plurality of characteristics (e.g. target sequences) of an individual plant in parallel.
Abstract:
In certain aspects, provided herein are compositions and methods related to the use of unique molecular identifiers (UMIs) to improve the error-correction capability of third generation sequencing and similar approaches that involve high precision reading of long segments of single DNA molecules.
Abstract:
Disclosed are methods for parallel single-step DNA purification starting with multiple crude biological samples for subsequent parallel PCR amplification of target DNA that attaches a unique DNA sequence tag (barcode) allowing all parallel processed samples to be combined into a single high-throughput sequencing run. The methods disclosed herein can be used to prepare and sequence dozens or hundreds of targeted samples as part of a rapid, highly parallel process, after which individual sample sequencing results are separated using the sample-specific tags (barcodes) to obtain results for each sample.