Phylogeny and recombination history of gallid herpesvirus 2 (Marek’s disease virus) genomes. – Abstract

Numerous genes and genomic regions have been utilized in the development of DNA-based diagnostic assays to differentiate outbreak-related isolates from vaccine strains in countries where ILT outbreaks have occurred. The primer sets amplified DNA from all but one sample. L. This translation tool is powered by Google. The name comes from the severe inflammation of the larynx and trachea. The name comes from the severe inflammation of the larynx and trachea. Thirty of the 46 microsatellite markers had microsatellite alterations.

Vet Pathol. The name comes from the severe inflammation of the larynx and trachea. However, ILTV possesses a typical alphaherpesvirus type D genome, consisting of long (UL) and short (US) unique regions, the latter flanked by inverted repeat sequences (IR and TR) and present in two isomeric orientations (17, 27, 39). The generation of replication-competent infectious clones of SB-1, together with those of CVI988 and herpesvirus of turkey strains described previously, completes the portfolio of generating infectious BAC clones of the MD vaccine strains belonging to all the three serotypes, paving the way for the application of reverse genetics for functional analysis of immunogenic determinants of these vaccines as well as for developing novel recombinant vectors. Recommended Action: Should you have a problem with sick poultry, it is important to test and treat any conditions. Infected birds can be the long-term silent carrier of the latent virus, where the virus will be re-excreted at a later time without symptoms. On electronmicroscopic examination of uranyl acetate and lead citrate-stained sections of affected tracheal mucosa, numerous large (250 x 254 nm) brick-shaped to biconcave intracytoplasmic virus particles with dense cores as well as smaller (80-100 nm in diameter) intranuclear virus particles with dense cores and a vague icosahedral symmetry, could be observed (Figures 1 and 2 – see arrows).


Only four ORFs, ORF C, U(L)37, ICP4 and U(S)2 differed in amino acid (aa) lengths among the newly sequenced genomes. Generally, alphaherpesvirus mutants that lack these glycoproteins are replication competent in cell culture but show a reduced capacity for cell-to-cell spread and hence smaller plaque sizes. See our Privacy Policy and User Agreement for details. taxid:10392 Gallid herpesvirus 2 strain H2 (no rank), Gallid herpesvirus 2 (strain H2) (synonym), Turkey herpesvirus (STRAIN H2) (synonym). The miRNA of oncogenic GaHV-2 strains of differing virulence has highly conserved sequences, and the Meq-clustered miRNAs are more highly expressed in lymphomas induced by a very virulent plus (vv+) GaHV-2 strain than those produced by a very virulent (vv) GaHV-2 strain, whereas the LAT-clustered miRNAs have equal expression [17] suggesting that the Meq-clustered miRNAs may have a more significant role in GaHV-2 oncogenesis. Based on the internal repeat long region, the new isolates were closely related to very virulent or very virulent plus strains. This gI/E-ve ILTV was readily propagated in cell culture in the presence of wildtype ILTV (wt ILTV).

Genus: Mardivirus Species: Gallid herpesvirus 2 (GaHV-2). 13th edition. Mardivirus, which contains Marek’s disease viruses types 1 and 2 of chickens and turkey herpesvirus; and Iltovirus, which contains gallid herpesvirus 1. Each viral transcript usually encodes a single protein and has a promoter/regulatory sequence, a TATA box, a transcription initiation site, a 5’ leader sequence of 30-300 bp (not translated), a 3’ nontranslated sequence of 10-30 bp, and a poly A signal. This suggests that the selected primers would be useful for the majority of the isolates encountered in outbreaks of ILTV. (1996). Only one copy of this repeat was found in the corresponding homologue of the wild type strain SA-0.

In the present study, we describe the expression profiles of all of the 26 GaHV-2 miRNAs during each stage in the cycle of MD pathogenesis, providing more information to help in unraveling their biological functions. Most of the ORFs had high sequence identity with homologous ORFs of reference strains. Different human herpesviruses vary in their numbers of human homologs, indicating distinct rates of gene acquisition in different lineages. In the case of chickens infected with an attenuated MDV1, the JM strain, the L-meq gene was detected at 2 to 7 weeks pi., and the meq gene was also detected at 2 to 6 weeks pi. Mechanisms implicated in the regulation of viral and cellular genes during GaHV-2 infection operate at transcriptional, post-transcriptional and post-translational levels, with involvement of viral and cellular transcription factors, along with epigenetic modifications, alternative splicing, microRNAs and post-translational modifications of viral proteins. Elsevier/Academic Press, London, pp. To construct a plasmid for establishing the standard curve of real-time PCR and checking the sensitivities of both assays, the LT BLEN GaHV-1 partial infected cell protein 4 (ICP4) gene was amplified by PCR using the following primers: ICP4-F (5’-CGCAGAGGACCAGCAAAGACCG-3’) and ICP4-R (5’-GAAGCAGACGCCGCCGTAGGAT-3’).

The generation of UL50-negative ILTV mutants was facilitated by recombination plasmids encoding green fluorescent protein (GFP), and expression constructs of predicted transactivator proteins of ILTV (alphaTIF, ICP4) were successfully used to increase the infectivity of viral genomic DNA.