Simple method for cDNA amplification starting from small amount of total RNA.

We describe a novel simple PCR-based technique for construction of cDNA libraries starting from the small samples of cells or tissues. This technique is based on the insertion of inverted terminal repeats (ITR) into amplified cDNA which causes a part of molecules to generate "pan"-type structures at each cycle of PCR amplification. This allows to avoid generation of the primer dimmer and makes possible the regulation of an average length of amplified sequences varying in concentration of primers.