Path: utzoo!utgpu!watserv1!watmath!uunet!bionet!UNIPAD.UNIPD.IT!BIOLEV From: BIOLEV@UNIPAD.UNIPD.IT (Max) Newsgroups: bionet.molbio.methds-reagnts Subject: Re: ELISA for DNA/RNA? Message-ID: <9102211218.AA25868@genbank.bio.net> Date: 21 Feb 91 11:56:00 GMT Sender: daemon@genbank.bio.net Lines: 28 >Has anybody come up with a way of fixing DNA or RNA to the bottoms of >microtiter plate wells? Say, for example you wanted to fix total RNA >samples from a large number of tissue samples (eg. a timecourse >experiment), and then hybridize with a biotinylated probe. Next add >streptavidin-conjugated alkaline phosphatase, and substrate, and read the >result in your microtiter plate reader. Essentially we're talking about >an ELISA for DNA. >---------| |----------- > | %%%%% | streptavidin-conjugated enzyme > \ ---- / biotinylated antisense RNA probe > \ ^^^^ / unlabeled total RNA (fixed to plate) > ------ >This is such an obvious idea that I would think there must be a kit >somewhere for it, but I don't recall having seen it in the literature. Yes, well I actually am using such a type of assay to detect Benzo(a)pyrene DNA adducts using an ELISA assay with a policlonal antibody raised against the BP-DNA adducts. The DNA samples are fixed to the bottom of the microtiter plate by first heat-denaturing them and then placing the solution in the wells and allowing the wells to dry out overnight at 37 C. The DNA then binds to the wells fairly well (say 100 ng DNA/well). Then incubate the first antibody with the DNA containing wells and after this incubate a second antirabbit-alkaline phosphatase conjugate and then use either a fluorochrome (methylumbelliferyl) or PNPP for visible EIA readers (405 nm). This is just a quick run through the method. If any further details are required......Glad to be of help!!!!! Brought to you by Super Global Mega Corp .com