Figure 3

Schematic figure presenting the principle of the microarray technique. (1.) A linear ssDNA probe containing target recognition sequences at 5’ and 3’ termini is hybridised to environmental gDNA. The probe is ligated into a circular molecule if a complementary target sequence is present. (2.) Circular probe is PCR amplified with 5’ phosphorylated forward and 5’ Cy3 labeled reverse primer and (3.) thereafter the phosphorylated strand is degraded. (4.) The Cy3-labeled products are hybridised on a microarray harbouring complementary ZipCode sequences and a common control probe sequence. Control probe carries a 6-Fam label.