Abstract
A macrorestriction map of the genome of Mycoplasma hyopneumoniae strain J, the type strain of the causative agent of enzootic pneumonia in pigs, was constructed using pulsed-field gel electrophoresis (PFGE) and DNA hybridization. The size of the genome as determined by PFGE was approximately 1070 kb. Assembly of the M. hyopneumoniae genomic map was facilitated and complimented by the simultaneous construction of an ordered cosmid library. Five contigs of overlapping cosmids were assembled, which together represent coverage of approximately 728 kb. Forty-two genetic markers (including three types of repeated elements) were placed on the M. hyopneumoniae map. Closer examination of an ApaI restriction fragment contained entirely within a single cosmid insert suggests that the genome size may be overestimated by PFGE.
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