How does the polio virus enter the cell?
How does the polio virus enter the cell?
Viral entry The mechanism by which the virus enters the cell is believed to be receptor-mediated endocytosis, after which the viral RNA is released into the cellular cytoplasm. Polio has a positive sense RNA viral genome. That means it can be directly translated into protein by the host cell.
How does picornavirus enter the cell?
The infectious cycles of picornaviruses are initiated following viral attachment to specific cellular receptors. The RNA genome is then released from the virion capsid and enters the cytoplasm of the infected cell.
How does the polio virus enter and replicate in a person?
In humans, poliovirus is ingested, and replicates in cells of the gastrointestinal tract. Newly synthesized virus particles are released into the intestine and shed in the feces. Transmission of poliovirus to another human occurs through contact with virus-containing feces or contaminated water.
Does picornavirus cause polio?
The viruses in this family can cause a range of diseases including the common cold, poliomyelitis, meningitis, hepatitis, and paralysis. Picornaviruses constitute the family Picornaviridae, order Picornavirales, and realm Riboviria. There are 158 species in this family, assigned to 68 genera.
Is polio lytic or lysogenic?
One such virus, poliovirus (PV), is an extremely lytic RNA virus that requires the expression of CD155, the poliovirus receptor (PVR), for infection.
Is picornavirus just a cold?
Although picornaviruses are among the smallest viruses (pico is Latin for “small”–Click here for more picornavirus Etymologies!), it has among its members, a huge variety of pathogens, able to cause Hepatitis A, the common cold, and polio.
How does the poliovirus capsid contribute to the viruses mode of infection?
Like all viruses, the poliovirus’s genetic material sits inside a protective protein-laden “capsid” shell. In most animal viruses, the capsid receives additional protection from a protein-studded viral envelope that facilitates infection by recognizing and binding to receptors on the cell surface.
Where are poliovirus receptors found?
CD155 is also commonly referred to as the “poliovirus receptor,” or PVR. It is expressed on the surface of intestinal epithelial cells and on M cells of Peyer’s patches, which may facilitate their entry into the Peyer’s patches following infection of the intestinal epithelium.
Does the poliovirus have an envelope?
Poliovirus, the causative agent of paralytic poliomyelitis, is a small non-enveloped virus, with a single strand RNA genome encased in an icosahedral protein capsid.
What portal of entry does poliovirus use?
Poliovirus infects only humans. Poliovirus is spread by the fecal-oral and respiratory routes.