| abstract |
Disclosed are methods and compositions for detection and amplification of nucleic acids, wherein two DNA strands hybridized to an RNA strand are ligated. In one aspect, the disclosed methods include removal of an energy source, such as ATP, upon charging a ligase to form an enzyme-AMP intermediate, and then adding substrate, which results in one complete round of RNA-templated DNA ligation. In another aspect, the ligation reaction is accomplished by use of a mixture of at least two different ligase enzymes. The disclosed methods and compositions for RNA-templated DNA ligation may be particularly useful for detection of RNA sequence variants, for example RNA splice variants, and for quantitative expression analysis. |