Pathogenicity and complete genome sequence analysis of the mud crab dicistrovirus-1.
A virus with a particle diameter of approximately 30 nm and no envelope was purified from diseased mud crab, Scylla paramamosain and it was demonstrated to be pathogenic to mud crab. The complete nucleotide sequence analysis indicated that its genome was a single molecule of linear positive-sense ssRNA with a length of 10,415 nucleotides, excluding the 3'poly (A) tail. It consisted of two open reading frames (ORF) separated by an intergenic region (IGR) and flanked by a 5'untranslated region (5'-UTR) and a 3'untranslated region (3'-UTR). The 5'-ORF encode five putative non-structural proteins, including BIR (Baculovirus Inhibitor of Apoptosis Protein Repeat), helicase, VPg (the genome-linked viral protein), 3C-like protease and RdRP (RNA-dependent RNA polymerase), while the 3'-ORF encode the structural protein precursors. This genome organization was consistent with the typical organization of dicistrovirus and the virus was designated as mud crab dicistrovirus-1 (MCDV-1). The results of the phylogenetic analysis of the putative structural protein precursor suggest that MCDV-1 has a closer genetic relationship with Taura syndrome virus (TSV) than do other dicistroviruses and that MCDV-1 is a new member of the family Dicistroviridae and assigned into the genus Aparavirus.
MOE Key Laboratory of Aquatic Product Safety/State Key Lab for Biocontrol, School of Life Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, PR China.
Zhi-Xun
ZX
Guo
Jian-Guo
JG
He
Hai-Dong
HD
Xu
Shao-Ping
SP
Weng
D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003386:Brachyura / Q000821:virology*; D036022:Capsid Proteins / Q000235:genetics; D056629:Dicistroviridae / Q000145:classification / Q000235:genetics* / Q000472:pathogenicity / Q000648:ultrastructure; D023061:Gene Order; D016679:Genome, Viral; D008969:Molecular Sequence Data; D010802:Phylogeny; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017361:Viral Nonstructural Proteins / Q000737:chemistry / Q000235:genetics; D014771:Virion / Q000302:isolation & purification / Q000648:ultrastructure
D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D036022:Capsid Proteins; D017361:Viral Nonstructural Proteins