Investigations will be continued to define the molecular structure of equine herpesvirus (EHV) genomes and to ascertain the relationship between viral gene structure and function. Overall goals concern the elucidation of viral DNA sequences, gene products and alterations in viral gene programming that are involved in mediating oncogenic transformation and persistent infection. Toward these aims, the following studies will be continued: 1) to use restriction enzymes methodologies, electron microscopic techniques and DNA hybridization methods to ascertain the genomic structures of standard EHV-1, EHV-2 (ECMV; cytomegalovirus) and EHV-3 (venereal disease virus) and of EHV-1 defective interfering (DI) particles that establish persistent infections of hamster and mouse cells. 2) to use recombinant DNA technology to generate libraries of EHV DNA fragments for use in experiments such as fine mapping and sequencing defined genomic segments of biological and structural importance, transfection assays to test fragments for transforming potential and capacity to alter viral gene programming, etc., 3) to identify by DNA hybridization methods the DNA sequences shared by these three viruses that differ in biology and to determine whether related DNA sequences are arranged colinearly and whether they mediate similar functions, 4) to examine the regulated programming of EHV gene expression in cytocidal infection and continue to define the properties of alpha, beta and gamma mRNAs and polypeptides, 5) to map polypeptides to specific mRNAs and DNA loci by in vitro translation methods, 6) to elucidate alterations in EHV gene products and/or in gene programming in cells persistently infected with EHV-1 DI particles or ECMV, and in cells harboring defective DNA fragments, 7) to analyze a variety of EHV-1, -2, and -3 transformed and tumor cells in hamster and mouse models for viral DNA sequences so that the nature, arrangement and role (initiation and/or maintenance) of these viral genes in transformation may be elucidated, and 8) to conduct transfection experiments to evaluate whether specific EHV cloned DNA fragments can mediate transformation.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI022001-04
Application #
3132567
Study Section
Experimental Virology Study Section (EVR)
Project Start
1984-07-01
Project End
1991-06-30
Budget Start
1987-07-01
Budget End
1988-06-30
Support Year
4
Fiscal Year
1987
Total Cost
Indirect Cost
Name
Louisiana State University Hsc Shreveport
Department
Type
Schools of Medicine
DUNS #
City
Shreveport
State
LA
Country
United States
Zip Code
71103
Shakya, Akhalesh K; O'Callaghan, Dennis J; Kim, Seong K (2017) Comparative Genomic Sequencing and Pathogenic Properties of Equine Herpesvirus 1 KyA and RacL11. Front Vet Sci 4:211
Charvat, Robert A; Zhang, Yunfei; O'Callaghan, Dennis J (2012) Deletion of the UL4 gene sequence of equine herpesvirus 1 precludes the generation of defective interfering particles. Virus Genes 45:295-303
Dai, Gan; Kim, Seongman; O'Callaghan, Dennis J et al. (2012) Development of a bacterial artificial chromosome (BAC) recombineering procedure using galK-untranslated region (UTR) for the mutation of diploid genes. J Virol Methods 182:18-26
Ahn, ByungChul; Zhang, Yunfei; Osterrieder, Nikolaus et al. (2011) Properties of an equine herpesvirus 1 mutant devoid of the internal inverted repeat sequence of the genomic short region. Virology 410:327-35
Kim, Seong K; Kim, Seongman; Dai, Gan et al. (2011) Identification of functional domains of the IR2 protein of equine herpesvirus 1 required for inhibition of viral gene expression and replication. Virology 417:430-42
Ahn, Byung Chul; Kim, Seongman; Zhang, Yunfei et al. (2011) The early UL3 gene of equine herpesvirus-1 encodes a tegument protein not essential for replication or virulence in the mouse. Virology 420:20-31
Charvat, Robert A; Breitenbach, Jonathan E; Ahn, ByungChul et al. (2011) The UL4 protein of equine herpesvirus 1 is not essential for replication or pathogenesis and inhibits gene expression controlled by viral and heterologous promoters. Virology 412:366-77
Ahn, Byung Chul; Zhang, Yunfei; O'Callaghan, Dennis J (2010) The equine herpesvirus-1 (EHV-1) IR3 transcript downregulates expression of the IE gene and the absence of IR3 gene expression alters EHV-1 biological properties and virulence. Virology 402:327-37
Breitenbach, Jonathan E; Ebner, Paul D; O'Callaghan, Dennis J (2009) The IR4 auxiliary regulatory protein expands the in vitro host range of equine herpesvirus 1 and is essential for pathogenesis in the murine model. Virology 383:188-94
Ebner, Paul D; Kim, Seong K; O'Callaghan, Dennis J (2008) Biological and genotypic properties of defective interfering particles of equine herpesvirus 1 that mediate persistent infection. Virology 381:98-105

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