Skip to main content
Cloning and Sequencing of the iss Gene from a Virulent Avian Escherichia coli
Avian Diseases (2000)
  • Shelley M. Horne, North Dakota State University
  • Samantha J. Pfaff-McDonough, North Dakota State University
  • Catherine W. Giddings, North Dakota State University
  • Lisa K. Nolan, North Dakota State University
Control of colibacillosis is important to the poultry industry. We have found that the presence of a gene for increased serum survival, iss, is strongly correlated with Escherichia coli isolated from birds with colibacillosis. Therefore, the iss gene and its protein product, Iss, are potential targets for detection and control of avian colibacillosis. The iss gene was amplified from a virulent avian E. coli isolate and sequenced. The sequences of the gene and the predicted protein product were compared with those of iss from a human E. coli isolate and lambda bor. The iss gene from the avian E. coli isolate has 96.8% identity with the iss gene from the human E. coli isolate and 89.4% identity with lambda bor. The Iss protein from the avian isolate has 87% identity with Iss from the human isolate and 90% identity with Bor. The low identity between the two Iss proteins is because of a frame- shift in their respective coding sequences. In sum, iss from this avian E. coli isolate is very similar to iss from a human E. coli isolate, but because of a frameshift mutation in the coding sequence of iss from the human E. coli isolate, Iss proteins from avian and human E. coli isolates have only 87% identity. The strong association of iss with E. coli isolated from birds with colibacillosis, suggests that this sequence be studied for its value as a marker or target to be used in colibacillosis control.
Publication Date
March, 2000
Publisher Statement
Copyright 2000 American Association of Avian Pathologists. Posted with permission.
Citation Information
Shelley M. Horne, Samantha J. Pfaff-McDonough, Catherine W. Giddings and Lisa K. Nolan. "Cloning and Sequencing of the iss Gene from a Virulent Avian Escherichia coli" Avian Diseases Vol. 44 Iss. 1 (2000)
Available at: