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A Possible Heterodimeric Prophage-Like Element in the Genome of the Insect Endosymbiont Sodalis glossinidius

Department of Molecular and Cellular Biology, University of Arizona, Tucson, Arizona,¹ Department of Biology, University of Utah, Salt Lake City, Utah²

Received 23 June 2006/ Accepted 25 December 2006

Extrachromosomal element pSOG3 (52,162 nucleotides) in the genome of Sodalis glossinidius contains redundant phage-related gene pairs, indicating that it may have been formed by the fusion of two ancestral phage genomes followed by gene degradation. We suggest that pSOG3 is a prophage that has undergone genome degeneration accompanying host adaptation to symbiosis.

Published ahead of print on 5 January 2007.