مریم ریوندی - Master student of Genetic, Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
بهاره نوروزی - Assistant Prof., Department of Biotechnology, Science and Research Branch, Islamic Azad University, Tehran, Iran
حسین فهمیی - Assistant Prof., Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran

Lavasan Lake situated in the north-east of Tehran (Iran) is a complex ecosystem of cyanobacterial strains with an ability to produce a wide range of toxic natural compounds that may lead to many problems or even death of humans and animals. Based on the report of toxic cyanobacterial strains present in the Lavasan Lake, the morphological and phylogenetic study of the toxic strain purified from Lavasan Lake water, was performed using ۱۶S rRNA and ITS gene markers. According to the results, the phylogenetic tree was drawn based on ۱۶S rRNA gene, non-toxic strains with the toxic strain Anabaena sp. strain B۳ (CCC B۳) were not clustered within a cloud. In addition, the ability to produce toxins appears to be lost over time. The results of ITS gene analysis using Mfold showed that, the most important difference between the toxic strain Anabaena sp. B۳ with other non-toxic strains of Anabaena sp. has the number of nucleotides at terminal bilateral bulge and the number of loops at bilateral bulge in the D۱-D۱ helix. However, Box B helix structure was not different in any of the strains. This is the first report of molecular phylogeny of a toxin-producing cyanobacterium isolated from the Lavasan Lake.  

Cluster, Ecosystem, Internal transcribed spacer (ITS), Structural genes, ۱۶S rRNA