摘要:
Aspects of the present invention relate to compositions and methods for providing DNA fragments from an archived sample (e.g., paraffin-embedded and/or fixed-tissue biopsies, etc). Particular aspects provide methods whereby high yields of DNA are isolated as well as a substantial portion of the DNA consists of long DNA fragments, and where the isolated genomic DNA is free of associated or cross-linked contaminants like proteins, peptides, amino acids or RNA. The methods are facile, cost-effective, an are characterized by high reproducibility and reliability. Particular aspects provide methods for providing DNA fragments derived from an archived sample, wherein the yield of DNA before, for example, an amplification step is at least 20%, and amplicons up to a length of about 1,000 base pairs are amplifiable.
摘要:
Aspects of the present invention relate to compositions and methods for providing DNA fragments from an archived sample (e.g., paraffin-embedded and/or fixed-tissue biopsies, etc). Particular aspects provide methods whereby high yields of DNA are isolated as well as a substantial portion of the DNA consists of long DNA fragments, and where the isolated genomic DNA is free of associated or cross-linked contaminants like proteins, peptides, amino acids or RNA. The methods are facile, cost-effective, and are characterized by high reproducibility and reliability. Particular aspects provide methods for providing DNA fragments derived from an archived sample, wherein the yield of DNA before, for example, an amplification step is at least 20%, and amplicons up to a length of about 1,000 base pairs are amplifiable.
摘要:
Aspects of the present invention relate to compositions and methods for providing DNA fragments from a remote sample. In particular aspects a remote sample comprising DNA is provided, DNA is isolated from the remote sample, and the isolated DNA is treated in a way which allows differentiation of methylated and unmethylated cytosine. Additional, particular embodiments provide compositions and methods for methylation analysis of DNA derived from a remote sample. Other aspects provide for compositions and methods of whole genome amplification of bisulfite treated DNA.
摘要:
Aspects of the present invention relate to compositions and methods for providing DNA fragments from a remote sample. In particular aspects a remote sample comprising DNA is provided, DNA is isolated from the remote sample, and the isolated DNA is treated in a way which allows differentiation of methylated and unmethylated cytosine. Additional, particular embodiments provide compositions and methods for methylation analysis of DNA derived from a remote sample. Other aspects provide for compositions and methods of whole genome amplification of bisulfite treated DNA. Other aspects provide methods for determining the presence or absence of methylation of at least one cytosine, or a series of cytosines in cis, in human DNA of a blood sample, a plasma sample, a serum sample or a urine sample from a human individual.
摘要:
The invention relates to a method for quantitatively determining the methylation rate of a nucleic acid through sequencing. According to the invention, the method comprises at least the following steps: a) treating the nucleic acid with a chemical reagent or an enzyme containing solution, whereby the base pairing behavior of methylated cytosine bases and/or unmethylated cytosine bases of the nucleic acid are altered such that methylated cytosine bases become distinguishable from unmethylated cytosine bases, and b) introducing into the nucleic acid at least one base for generating a sequencing signal to be used as a reference signal for normalization, and c) sequencing the nucleic acid, whereby a signal from each cytosine base of the nucleic acid, or a signal from each guanine base of the nucleic acid and a reference signal from the at least on introduced base is obtained, and d) normalizing the signal obtained from each cytosine base of the nucleic acid, or the signal obtained from each guanine base of the nucleic acid to the reference signal from the at least one introduced base.
摘要:
A method for the analysis of cytosine methylations in DNA is described. Here, the DNA to be investigated is first chemically or enzymatically converted. Then a promoter is introduced into the DNA. After this, the DNA is converted to RNA. The methylation pattern of the DNA can be concluded in different ways by means of an analysis of the RNA. The RNA is preferably fragmented chemically or enzymatically prior to the analysis, whereby the fragmenting results depend on the methylation pattern of the DNA. The method according to the invention is particularly suitable for the diagnosis and prognosis of cancer disorders and other diseases associated with a modification of the methylation pattern.
摘要:
A method for sensitive and specific detection of cytosine methylation is described wherein the DNA to be analyzed is subjected to initial enrichment. More specifically, said enrichment can be effected in a methylation-specific, sequence-specific or origin-specific fashion. Thereafter, the enriched DNA is converted in a methylation-specific fashion. The converted DNA can be analyzed using various methods, particularly real-time PCR methods.
摘要:
The present invention describes a method for the detection of nucleic acid sequences, which is characterized in that the following steps are conducted: a) at least one nucleic acid is bound to a solid phase; b) probe molecules are hybridized to the nucleic acids in a sequence-specific manner, whereby the probe molecules are provided with a cleavable bond and a mass label, which is specific for the probe molecule; c) removal of the unhybridized probe molecules; d) contacting of the hybridized probe molecules with a matrix, which cleaves said cleavable bonds and at the same time serves as the matrix in a MALDI mass spectrometer; e) detection of the mass label at those positions where the nucleic acid was bound.
摘要:
Aspects of the invention provide methods, nucleic acids and kits for detecting, or for detecting and distinguishing between or among liver cell proliferative disorders or for detecting, or for detecting and distinguishing between or among colorectal cell proliferative disorders. Particular aspects disclose and provide genomic sequences the methylation patterns of which have substantial utility for the improved detection of and differentiation between said class of disorders, thereby enabling the improved diagnosis and treatment of patients.
摘要:
From an real valued OFDM signal (S0(t)) is a baseband signal (SB(t)) derived and converted into a complex single sideband modulation signal (n(t)). This is modulated onto an optical carrier (fOC) to generate a SSB transmission signal (SOT) having a small bandwidth an carrying the information in the envelope or in the power of the envelope. According to the modulation direct detection is possible. Only a small bandwidth is necessary for the transmission.