Molecular differentiation between aflatoxinogenic and non-aflatoxinogenic strains of Aspergillus flavus and Aspergillus parasiticus.

Three types of media and a multiplex PCR procedure with a set of four primers were used to differentiate between aflatoxinogenic and non-aflatoxinogenic strains of Aspergillus flavus and Aspergillus parasiticus. Four sets of primers were the aflR, nor-1, ver-1, and omt-A genes of the aflatoxin biosynthetic pathway. Multiplex PCR showed that the four aflatoxinogenic strains gave a quadruplet pattern, indicating the presence of all the genes involved in the aflatoxin biosynthetic pathway which encode for the products. Non-aflatoxinogenic strains gave varying results with two, three, or four banding patterns. A banding pattern in seven non-aflatoxinogenic strains resulted in non-differentiation between these and aflatoxinogenic strains. [ABSTRACT FROM AUTHOR]