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Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Methods+Mol+Biol 2012 ; 941 (ä): 181-93 Nephropedia Template TP
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End-Labeling Oligonucleotides with Chemical Tags After Synthesis #MMPMID23065562
Zearfoss NR; Ryder SP
Methods Mol Biol 2012[]; 941 (ä): 181-93 PMID23065562show ga
Many experimental strategies for determining nucleic acid function require labeling the nucleic acid with radioisotopes or a chemical tag. Labels enable nucleic acid detection, yield information about its state, and can serve as a handle by which the nucleic acid and associated factors can be purified from a mixture. Radioactive phosphate is commonly added to the 5? or 3? end of an oligonucleotide post-synthesis using enzyme-catalyzed reactions. In contrast, chemical tags are usually added during synthesis or using reactive groups that are incorporated during synthesis. Here, we present protocols for post-synthetic conjugation of chemical tags to unmodified RNA or DNA oligonucleotides. The approach can be used to attach fluorescent dyes and biotin groups to oligonucleotides, and to immobilize oligonucleotides to a solid support. Oligonucleotides tagged with fluorescent dyes are readily detected in both gel- and plate reader-based assays, while biotin or resin conjugated oligonucleotides are useful tools for affinity purification. Fluorescent end-labeling provides several advantages over radioactive labeling, reducing radioactivity-associated hazards and yielding a labeled molecule that does not decay, while providing the sensitivity required for many procedures.