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Sequence analysis of major structural proteins of newly isolated mouse hepatitis virus
1Division of Experimental Animal Research, National Institute of Infectious Diseases, Tokyo, Japan.
Abstract:
We have isolated the virus from a fecal pellet in the colon of a BALB/c mouse with X-linked immunodeficiency (xid) housed in a room in which there has recently been an epidemic due to mouse hepatitis virus (MHV) and designated it as the MHV-TY strain. Sequence analysis of the MHV-TY strain was performed on major structural, spike (S), membrane (M) and nucleocapsid (N), proteins directly from PCR products. The comparison of nucleotide sequences of MHV-TY with other strains investigated so far revealed that all three structural proteins of the TY strain had some unique amino acid sequences among MHV strains which can be used as markers of this strain.
Insights
Researchers identified a new mouse hepatitis virus (MHV) strain, MHV-TY, from an immunodeficient mouse. Sequence analysis revealed unique markers in its structural proteins, distinguishing it from other MHV strains.
Area of Science:
- Virology
- Immunology
- Genomics
Background:
- Mouse hepatitis virus (MHV) is a significant pathogen in laboratory mice.
- X-linked immunodeficiency (xid) mice are a model for studying immune responses.
- Recent MHV epidemics necessitate the identification and characterization of new strains.
Purpose of the Study:
- To isolate and characterize a novel MHV strain from an immunodeficient mouse.
- To analyze the genetic makeup of the MHV-TY strain, focusing on structural proteins.
- To identify unique genetic markers for the MHV-TY strain.
Main Methods:
- Isolation of the virus from fecal samples of BALB/c xid mice.
- Polymerase Chain Reaction (PCR) amplification of viral structural protein genes (S, M, N).
- Nucleotide sequence analysis and comparison with existing MHV strains.
Main Results:
- Successful isolation of a new MHV strain, designated MHV-TY.
- Sequence analysis of spike (S), membrane (M), and nucleocapsid (N) proteins.
- Identification of unique amino acid sequences in all three structural proteins of MHV-TY.
Conclusions:
- The MHV-TY strain possesses distinct genetic features.
- Unique amino acid sequences in S, M, and N proteins can serve as markers for strain identification.
- This finding aids in the surveillance and control of MHV outbreaks in research settings.