The hemagglutinin-neuraminidase (HN) of Newcastle disease virus (NDV) is a multifunctional protein that has receptor recognition, neuraminidase, and fusion promotion activities. Sequence analysis revealed that the HN gene of many extremely low virulence NDV strains encodes a larger open-reading frame (616 amino acids, aa) with additional 45 aa at its C-terminus when compared with that (571 aa) of virulent NDV strains. Therefore, it has been suspected that the 45 aa extension at the C-terminus of the HN may affect the NDV virulence. In this study, we generated an NDV mesogenic strain Anhinga-based recombinant virus with an HN C-terminal extension of 45 aa (rAnh-HN-ex virus) using reverse genetics technology. The biological characterization of the recombinant virus showed that the rAnh-HN-ex virus had similar growth ability to its parental virus rAnh-wt both in embryonating chicken eggs and DF-1 cells. However, the pathogenicity of this recombinant virus in embryonating chicken eggs and day-old chickens decreased, as evidenced by a longer mean death time and lower intracerebral pathogenicity index when compared with the parental virus. This is consistent with our previous finding that the recombinant LaSota virus with a 45-aa extension at its HN C-terminal was attenuated in chickens and embryonating eggs. These results suggest that the HN protein C-terminal extension may contribute to the reduced virulence in some low virulence NDV strains.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s11262-013-0973-4 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The oncolytic effect of Newcastle disease virus attenuated AMHA1 strain against digestive system tumors.
Vet World
November 2024
Department of Experimental Therapy, Iraqi Center for Cancer and Medical Genetics Research, Mustansiriyah University, Al-Qadisiyah, Baghdad 1001, Iraq.
Background And Aim: Malignant diseases are among the most common and deadly illnesses that are often spread due to lifestyle choices. These diseases are caused by unchecked cell growth, which can be curable if detected early. Cancer treatment is dependent on various internal and external factors.
View Article and Find Full Text PDFA novel approach for efficient co-expression of two foreign genes based on the reverse genetic system of Newcastle disease virus.
Front Microbiol
December 2024
Department of Epidemiology, School of Public Health, Harbin Medical University, Harbin, China.
Article Synopsis
- Newcastle disease virus (NDV) serves as a valuable model for studying viral mechanisms and is being utilized as a vector for vaccine development and cancer therapy.
- A reverse genetic system was created for the NDV Mukteswar strain, allowing for the insertion of the enhanced green fluorescent protein (EGFP) gene between the P and M genes to form a stable transcription unit that expresses exogenous genes over multiple generations.
- Through this system, a recombinant virus that co-expresses EGFP and cherry fluorescent protein (CFP) was developed, demonstrating efficient simultaneous expression of both proteins, though with slight differences in expression levels, and similar growth rates with mild virulence attenuation compared to the original strains.
Clinical and molecular identification of Newcastle disease virus in naturally infected chicks in Thi-Qar province of Iraq.
Open Vet J
November 2024
Department of Physiology, College of Veterinary Medicine and Surgery, Shatrah University, Shatrah, Thi-Qar, Iraq.
Background: In poultry, despite intense vaccination programs for prevention of Newcastle disease (ND), the ND infection still affects, causing high mortality in most vaccinated flocks.
Aim: This study aimed to determine whether the genetic material of the ND virus has changed and has become incompatible with the vaccines used in Iraq.
Methods: Real-time PCR was used to analyze genetic variation in the fusion (F) and haemaggluatination neuraminidase (HN) genes, as well as mRNA expression changes in inflammatory biomarkers, including C-reactive protein (CRP), interleukin 6, interleukin-1 beta (IL-6, IL-1β), and gamma interferon (IFN-γ).
Newcastle Disease Vaccination Program in Broilers Using an Apathogenic Heat-Resistant Vaccine.
Arch Razi Inst
June 2024
Department of Clinical Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.
Newcastle disease (ND) is among the most common and deadliest poultry diseases worldwide. Thermostable Newcastle disease virus (NDV) vaccines have been widely used to protect village chickens against ND due to their decreased dependence on cold chains for transport and storage. The NDV4 Heat-Resistant (NDV4HR) vaccine is an apathogenic, heat-resistant, live vaccine that can induce immunity in chickens.
View Article and Find Full Text PDFThe Role of Dual Mutations G347E and E349D of the Pigeon Paramyxovirus Type 1 Hemagglutinin-Neuraminidase Protein In Vitro and In Vivo.
Vet Sci
November 2024
Animal Infectious Disease Laboratory, College of Veterinary Medicine, Yangzhou University, Yangzhou 225012, China.
Pigeon Newcastle disease (ND) is the most common viral infectious disease in the pigeon industry, caused by pigeon paramyxovirus type 1 (PPMV-1), a variant of chicken-origin Newcastle disease virus (NDV). Previous studies have identified significant amino acid differences between PPMV-1 and chicken-origin NDV at positions 347 and 349 in the hemagglutinin-neuraminidase (HN) protein, with PPMV-1 predominantly exhibiting glycine (G) at position 347 and glutamic acid (E) at position 349, while most chicken-origin NDVs show E at position 347 and aspartic acid (D) at position 349. However, the impact of these amino acid substitutions remains unclear.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!