TY - JOUR
T1 - Characterization of a Taura syndrome virus isolate originating from the 2004 Texas epizootic in cultured shrimp
AU - Dhar, Arun K.
AU - Lakshman, Dilip K.
AU - Amundsen, Keenan
AU - Robles-Sikisaka, Refugio
AU - Kaizer, Krista N.
AU - Roy, Sribash
AU - Hasson, Kenneth W.
AU - Allnutt, F. C.Thomas
N1 - Funding Information:
This project received support from the Defense Advanced Research Projects Agency (DARPA) and from the Defense Threat Reduction Agency (DTRA) Chemical and Biological Technologies Directorate Transformational Medical Technologies Initiative under DTRA contract HDTRA1-07-C-0078. The authors would like to thank Dr. Narayan Khan, Medicore Inc., Rockville, MD for purifying the virus.
PY - 2010/3
Y1 - 2010/3
N2 - A comprehensive investigation of the Taura syndrome virus (TSV) isolate that caused epizootics in shrimp farms in Texas in 2004 (Texas isolate) revealed that this virus was more virulent in laboratory bioassays than the TSV reference isolate, Hawaii 1994, causing severe symptom development and rapid mortality. Histopathology of moribund animals demonstrated epithelial necrosis within the stomach, appendages, general body cuticle and gills, and the surviving animals demonstrated moderate to numerous lymphoid organ spheroids. Purified virions showed icosahedral morphology, with a diameter of 31 nm. Comparative genome analysis showed that the Texas isolate is more closely related to TSV isolates from Thailand and China than to the Hawaii isolate. The predicted tertiary structures of the inhibition of apoptosis protein (IAP) and protease domains of the Texas isolate are very similar to those of the Hawaii isolate. However, the RNA-dependent RNA polymerase (RdRp) of the Texas isolate has significant structural differences from the Hawaii isolate due to point mutation(s) in the RdRp gene. Changes in the RdRp tertiary structure might contribute to the replication fidelity, virulence and ecological adaptability of the Texas isolate.
AB - A comprehensive investigation of the Taura syndrome virus (TSV) isolate that caused epizootics in shrimp farms in Texas in 2004 (Texas isolate) revealed that this virus was more virulent in laboratory bioassays than the TSV reference isolate, Hawaii 1994, causing severe symptom development and rapid mortality. Histopathology of moribund animals demonstrated epithelial necrosis within the stomach, appendages, general body cuticle and gills, and the surviving animals demonstrated moderate to numerous lymphoid organ spheroids. Purified virions showed icosahedral morphology, with a diameter of 31 nm. Comparative genome analysis showed that the Texas isolate is more closely related to TSV isolates from Thailand and China than to the Hawaii isolate. The predicted tertiary structures of the inhibition of apoptosis protein (IAP) and protease domains of the Texas isolate are very similar to those of the Hawaii isolate. However, the RNA-dependent RNA polymerase (RdRp) of the Texas isolate has significant structural differences from the Hawaii isolate due to point mutation(s) in the RdRp gene. Changes in the RdRp tertiary structure might contribute to the replication fidelity, virulence and ecological adaptability of the Texas isolate.
UR - https://www.scopus.com/pages/publications/77949897117
UR - https://www.scopus.com/pages/publications/77949897117#tab=citedBy
U2 - 10.1007/s00705-009-0584-5
DO - 10.1007/s00705-009-0584-5
M3 - Article
C2 - 20049618
AN - SCOPUS:77949897117
SN - 0304-8608
VL - 155
SP - 315
EP - 327
JO - Archives of virology
JF - Archives of virology
IS - 3
ER -