Genomic characterization of the first class I Newcastle disease virus isolated from the mainland of China.
The complete genomic sequence of Newcastle disease virus (NDV) strain NDV08-004, isolated from domestic ducks in China, was determined in this study. The genome is 15198 nucleotides (nt) in length, follows the "rule of six" and contains a 55-nt leader sequence at the 3' end and a 114-nt trailer sequence at the 5' end. Compared with the full genome sequences of Class II NDV strains, the NDV08-004 isolate has a 12-nt insertion (TGGGAGACGGGG) in the phosphoprotein gene between nucleotides 2381 and 2382 of the genome (numbered according to the genomic sequence of the La Sota strain, which consists of 15186 nt). Strain NDV08-004 has the motif (112)E-Q-Q-E-R-L(117) at the cleavage site of the fusion protein, which is typical of lentogenic NDV strains, and this is in agreement with the results of pathogenic tests based on the mean death time (MDT) and the intracerebral pathogenicity index (ICPI). Phylogenetic analysis based on the full genome revealed that all the NDV strains studied could be divided into two distinct clades, namely class I and class II, and the NDV08-004 isolate characterized in this study was grouped in class I. Further phylogenetic analysis based on a 374-bp fragment of the F gene in class I strains of NDV demonstrated that NDV08-004 belongs to genotype 3, and should be therefore similar to strains obtained from live bird markets in Hong Kong in recent years.
Liu
Hualei
H
National Reference Laboratory for Newcastle Disease, China Animal Health and Epidemiology Center, Qingdao 266032, China.
Chen
Fei
F
Zhao
Yunling
Y
Zheng
Dongxia
D
Li
Jinming
J
Xu
Tiangang
T
Qi
Lin
L
Wang
Zhiliang
Z
D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D000818:Animals; D002681:China; D016000:Cluster Analysis; D004372:Ducks; D016679:Genome, Viral; D008969:Molecular Sequence Data; D009521:Newcastle Disease / Q000821:virology*; D009522:Newcastle disease virus / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification* / Q000472:pathogenicity; D010802:Phylogeny; D011201:Poultry Diseases / Q000821:virology*; D012367:RNA, Viral / Q000235:genetics; D017422:Sequence Analysis, DNA; D014774:Virulence
D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D012367:RNA, Viral