Recombinant DNA probes for Mycoplasma synoviae

A genomic library was prepared from Mycoplasma synoviae (MS) strain WVU 1853 cloned in plasmid vector pUC8 and transformed in Escherichia coli host JM83. In dot blot assays, four transformed E. coli clones hybridized with 32P-labeled chromosomal DNA of MS but not with 32P-labeled chromosomal DNA of M. gallisepticum (MG) strain S6. In Southern hybridization, each of the CsCl-purified recombinant plasmid clones was shown to contain two MS DNA fragments between 1.0 to 2.3 kbp in length. 32P-Labeled probes prepared from each of the four recombinant plasmids hybridized in dot blot assays with MS strain WVU 1853 and nine MS field isolates but not with MG strains S6, K810, F2F10, four MG field isolates, and 15 other species of avian mycoplasmas.