摘要:
The invention is related to the detection of a methylated cytosine in a nucleic acid wherein guanidinium hydrogen sulfite is used for the preparation of a solution containing guanidinium ions and sulfite ions and subsequent modification of the nucleic acid. Thereby, a non-methylated cytosine is converted to uracil. The invention further discloses kits for performing the methods of the invention.
摘要:
The present application is directed to a method for performing a bisulfite reaction to determine methylation positions in a nucleic acid, i.e. methylated and non-methylated cytosines. In this method, the nucleic acid is bisulfite treated and is bound to a solid phase when an alkaline solution is added for desulfonation and elution of the nucleic acid from the solid phase. The nucleic acid can be amplified in an additional step. The solid phase is preferably a material comprising glass or silica, more preferably a glass fleece, glass membrane or a magnetic glass particle. Further, several uses of the alkaline solution for bisulfite treatment are disclosed and a kit containing a bisulfite reagent, a solid phase and an alkaline solution.
摘要:
The invention concerns a process for preparing biological samples for the subsequent detection of an analyte. In particular, the invention relates to a process for the isolation of a nucleic acid in a sample using a suspension of magnetic glass particles. In addition, kits and apparatuses containing magnetic glass particles for sample preparation are provided.
摘要:
An immunological method for the determination of triazine and triazine derivatives by a competitive immunoassay in which the sample and labelled atrazine compete for a polyclonal antibody which is bound to a solid phase before, during or after the immunological reaction, the immunological complex binds to the solid phase, the solid phase and unbound labelled atrazine are separated and the label in the solid or liquid phase is determined as a measure of the content of triazine and triazine derivatives, which is characterized in that polyclonal antibodies which were obtained by immunization with a 4-alkylamino-S-triazine are used and a conjugate of a label and 4-amino-S-triazine which is bound to the label via the 6 position is used as the labelled atrazine. Triazine and triazine derivatives can be determined simultaneously using this method.
摘要:
The present application is directed to a method for performing a bisulfite reaction to determine methylation positions in a nucleic acid, i.e. methylated and non-methylated cytosines, whereby the nucleic acid is incubated in a solution comprising the nucleic acid for a time period of 1.5 to 3.5 hours at a temperature between 70 and 90° C., whereby the concentration of bisulfite in the solution is between 3 M and 6.25 M and whereby the pH value of the solution is between 5.0 and 6.0 whereby the nucleic acid, i.e. the cytosine bases in the nucleic acid, are deaminated. Then the solution comprising the deaminated nucleic acid is desulfonated and preferably desalted. The application is further related to a solution comprising bisulfite with a certain pH and uses thereof as well as a kit comprising the solution.
摘要:
The invention concerns a method for determining antigen-specific antibodies of a particular immunoglobulin class in a sample by means of an immunoassay in an array format in which various binding partners Bnx are bound on different discrete areas on a support where Bnx in each case contain the various antigens that are able to specifically bind to the antibodies to be detected, by incubating the support with the sample and a binding partner B2 which carries a label and subsequently detecting the label on the respective discrete areas wherein B2 specifically binds antibodies of a certain immunoglobulin class that have been bound in an antigen-specific manner.
摘要:
A method for detecting sequence specific methylation in a biomolecule, comprising: (a) contacting the biomolecule with an S-adenosyl-L-methionine-dependent methyltransferase in the presence of a detectable cofactor of said methyltransferase; and (b) detecting whether the recognition sequence of said methyltransferase has been modified with the cofactor or a derivative thereof, wherein modification of the recognition sequence of said methyltransferase is indicative of an absence of methylation at said recognition sequence. Also disclosed is a cofactor specific for S-adenosyl-L-methionine-dependent methyltransferases, wherein said cofactor is an N-adenosylaziridine derivative with a reporter group attached to the 6 or 7 position of the adenine ring or attached to the aziridine ring. A complex of the cofactor and a methyltransferase a composition comprising the cofactor or the complex and the use of the cofactor or the complex for detecting sequence-specific methylation in DNA molecules are also disclosed.
摘要:
A method for detecting sequence specific methylation in a biomolecule, comprising: (a) contacting the biomolecule with an S-adenosyl-L-methionine-dependent methyltransferase in the presence of a detectable cofactor of said methyltransferase; and (b) detecting whether the recognition sequence of said methyltransferase has been modified with the cofactor or a derivative thereof, wherein modification of the recognition sequence of said methyltransferase is indicative of an absence of methylation at said recognition sequence. Also disclosed is a cofactor specific for S-adenosyl-L-methionine-dependent methyltransferases, wherein said cofactor is an N-adenosylaziridine derivative with a reporter group attached to the 6 or 7 position of the adenine ring or attached to the aziridine ring. A complex of the cofactor and a methyltransferase a composition comprising the cofactor or the complex and the use of the cofactor or the complex for detecting sequence-specific methylation in DNA molecules are also disclosed.
摘要:
The invention is related to a method for amplifying a methylated target nucleic acid in a sample while avoiding amplification of a non-methylated target nucleic acid by inactivating it. This is accomplished by a restriction enzyme digest after bisulfite treatment of the target nucleic acid. The invention is further related to the use of a restriction enzyme to avoid amplification of a non-methylated target nucleic acid while amplifying a methylated target nucleic acid in a sample and kits for performing the methods according to the invention.
摘要:
The invention is related to the detection of a methylated cytosine in a nucleic acid wherein guanidinium hydrogen sulfite is used for the preparation of a solution containing guanidinium ions and sulfite ions and subsequent modification of the nucleic acid. Thereby, a non-methylated cytosine is converted to uracil. The invention further discloses kits for performing the methods of the invention.