Caliciviridae

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Caliciviridae
Calicivirus.jpg
Virus classification Red Pencil Icon.png
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Pisuviricota
Class: Pisoniviricetes
Order: Picornavirales
Family:Caliciviridae
Genera

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The Caliciviridae are a family of "small round structured" viruses, members of Class IV of the Baltimore scheme. Caliciviridae bear resemblance to enlarged picornavirus and was formerly a separate genus within the picornaviridae. [1] They are positive-sense, single-stranded RNA which is not segmented. [2] Thirteen species are placed in this family, divided among eleven genera. [3] Diseases associated with this family include feline calicivirus (respiratory disease), rabbit hemorrhagic disease virus (often fatal hepatitis), and Norwalk group of viruses (gastroenteritis). [3] [4] Caliciviruses naturally infect vertebrates, and have been found in a number of organisms such as humans, cattle, pigs, cats, chickens, reptiles, dolphins and amphibians. The caliciviruses have a simple construction and are not enveloped. The capsid appears hexagonal/spherical and has icosahedral symmetry (T=1 [5] or T=3 [6] [4] ) with a diameter of 35–39 nm. [7]

Contents

Caliciviruses are not very well studied because until recently, they could not be grown in culture, and they have a very narrow host range and no suitable animal model. However, the recent application of modern genomic technologies has led to an increased understanding of the virus family. [7] A recent isolate from rhesus monkeys—Tulane virus—can be grown in culture, and this system promises to increase understanding of these viruses. [8]

Etymology

Calici- comes from the Latin word Calyx and the Greek word kalyx. The words mean a cup or chalice, a Calix. This comes from the strains having visible cup-shaped depressions.

Taxonomy

Phylogenetic tree of the family Caliciviridae and Poliovirus Fmicb-10-01280-g001.jpg
Phylogenetic tree of the family Caliciviridae and Poliovirus

The following genera are recognized: [9]

A number of other caliciviruses remain unclassified, including the chicken calicivirus.

Virology

Calicivirus genome comparison Fmicb-10-01280-g002.jpg
Calicivirus genome comparison

All viruses in this family possess a nonsegmented, polyadenylated, positive-sense, single-strand RNA genome around 7.5–8.5 kilobases in length, enclosed in an icosahedral capsid of 27–40 nanometers in diameter.[ citation needed ]

Life cycle

Viral replication is cytoplasmic. Entry into the host cell is achieved by attachment to host receptors, which mediate endocytosis. Replication follows the positive-stranded RNA virus replication model. Positive-stranded RNA virus transcription is the method of transcription. Translation takes place by leaky scanning, and RNA termination-reinitiation. Vertebrates serve as the natural host. Transmission routes are fecal-oral. [4]

Human disease

Calicivirus infections commonly cause moderate to severe gastroenteritis, which is the inflammation of the stomach and intestines (e.g. the Norwalk virus). Symptoms can include vomiting and diarrhea. These symptoms emerge after an incubation time of 2 days and the symptoms only generally last for 3 days. Most calicivirus infections do not require medical intervention, but those who are immunocompromised may need to be hospitalized due to serious fluid loss.[ citation needed ]

History

Establishing the viral etiology took many decades due to the difficulty of growing the virus in cell culture. In the 1940s and 1950s in the United States and Japan, caliciviridae could not be grown in culture, but as an experiment bacterial free filtrate of diarrhea was given to volunteers to check if viruses were present in volunteers' stool. [10] These experiments demonstrated that nonbacterial, filterable agents had the capability of causing enteric disease in humans. [10] In 1968, an outbreak at a Norwalk elementary school (e.g. Norwalk virus) in Ohio led to stool samples again being given to volunteers and serially passaged to other people. Finally, in 1972, Kapikian and his colleagues isolated the Norwalk virus from volunteers using immune electron microscopy, a process that involves looking directly at antibody-antigen complexes. [10] The classification of this one Norwalk virus strain served as the prototype for other species and small round structured viruses later known as Norovirus. [10]

Animal viruses

Feline calicivirus (FCV)—a member of the Vesivirus—represents an important pathogen of cats.[ citation needed ]

Sapovirus , Norovirus , and Vesivirus have been detected in pigs, making this animal species of particular interest in the study of calicivirus pathogenesis and host range.[ citation needed ]

The first mouse norovirus, murine norovirus 1 (MNV-1), was discovered in 2003. Since then, numerous murine norovirus strains have been identified and they were assigned a new genogroup in the genus Norovirus.[ citation needed ]

Rabbit hemorrhagic disease virus is a pathogen of rabbits that causes major problems throughout the world where rabbits are reared for food and clothing, make a significant contribution to ecosystem ecology, and where they support valued wildlife as a food source. [7]

Uses

Australia and New Zealand, in an effort to control their rabbit populations, have intentionally spread rabbit calicivirus.

Related Research Articles

<span class="mw-page-title-main">Norovirus</span> Type of viruses that cause gastroenteritis

Norovirus, sometimes referred to as the winter vomiting disease, is the most common cause of gastroenteritis. Infection is characterized by non-bloody diarrhea, vomiting, and stomach pain. Fever or headaches may also occur. Symptoms usually develop 12 to 48 hours after being exposed, and recovery typically occurs within one to three days. Complications are uncommon, but may include dehydration, especially in the young, the old, and those with other health problems.

<span class="mw-page-title-main">Picornavirus</span> Family of viruses

Picornaviruses are a group of related nonenveloped RNA viruses which infect vertebrates including fish, mammals, and birds. They are viruses that represent a large family of small, positive-sense, single-stranded RNA viruses with a 30 nm icosahedral capsid. The viruses in this family can cause a range of diseases including the common cold, poliomyelitis, meningitis, hepatitis, and paralysis.

<i>Barnaviridae</i> Family of viruses

Barnaviridae is a family of non-enveloped, positive-strand RNA viruses. Cultivated mushrooms serve as natural hosts. The family has one genus, Barnavirus, which contains one species: Mushroom bacilliform virus. Diseases associated with this family includes La France disease.

<i>Nodaviridae</i> Family of viruses

Nodaviridae is a family of nonenveloped positive-strand RNA viruses. Vertebrates and invertebrates serve as natural hosts. Diseases associated with this family include: viral encephalopathy and retinopathy in fish. There are nine species in the family, assigned to two genera.

<i>Cardiovirus</i> Genus of viruses

Cardiovirus are a group of viruses within order Picornavirales, family Picornaviridae. Vertebrates serve as natural hosts for these viruses.

<span class="mw-page-title-main">Astrovirus</span> Family of viruses

Astroviruses are a type of virus that was first discovered in 1975 using electron microscopes following an outbreak of diarrhea in humans. In addition to humans, astroviruses have now been isolated from numerous mammalian animal species and from avian species such as ducks, chickens, and turkey poults. Astroviruses are 28–35 nm diameter, icosahedral viruses that have a characteristic five- or six-pointed star-like surface structure when viewed by electron microscopy. Along with the Picornaviridae and the Caliciviridae, the Astroviridae comprise a third family of nonenveloped viruses whose genome is composed of plus-sense, single-stranded RNA. Astrovirus has a non-segmented, single stranded, positive sense RNA genome within a non-enveloped icosahedral capsid. Human astroviruses have been shown in numerous studies to be an important cause of gastroenteritis in young children worldwide. In animals, Astroviruses also cause infection of the gastrointestinal tract but may also result in encephalitis, hepatitis (avian) and nephritis (avian).

<i>Feline calicivirus</i> Species of virus

Feline calicivirus (FCV) is a virus of the family Caliciviridae that causes disease in cats. It is one of the two important viral causes of respiratory infection in cats, the other being Felid alphaherpesvirus 1. FCV can be isolated from about 50% of cats with upper respiratory infections. Cheetahs are the other species of the family Felidae known to become infected naturally.

<span class="mw-page-title-main">Sapovirus</span> Genus of viruses

Sapovirus is a genetically diverse genus of single-stranded positive-sense RNA, non-enveloped viruses within the family Caliciviridae. Together with norovirus, sapoviruses are the most common cause of acute gastroenteritis in humans and animals. It is a monotypic taxon containing only one species, the Sapporo virus.

<span class="mw-page-title-main">Rabbit hemorrhagic disease</span> Disease that affects wild and domestic rabbits

Rabbit hemorrhagic disease (RHD), also known as viral hemorrhagic disease (VHD), is a highly infectious and lethal form of viral hepatitis that affects European rabbits. Some viral strains also affect hares and cottontail rabbits. Mortality rates generally range from 70 to 100 percent. The disease is caused by strains of rabbit hemorrhagic disease virus (RHDV), a lagovirus in the family Caliciviridae.

<i>Cowpea chlorotic mottle virus</i> Species of virus

Cowpea chlorotic mottle virus, known by the abbreviation CCMV, is a virus that specifically infects the cowpea plant, or black-eyed pea. The leaves of infected plants develop yellow spots, hence the name "chlorotic". Similar to its "brother" virus, Cowpea mosaic virus (CPMV), CCMV is produced in high yield in plants. In the natural host, viral particles can be produced at 1–2 mg per gram of infected leaf tissue. Belonging to the bromovirus genus, cowpea chlorotic mottle virus (CCMV) is a small spherical plant virus. Other members of this genus include the brome mosaic virus (BMV) and the broad bean mottle virus (BBMV).

<span class="mw-page-title-main">Double-stranded RNA viruses</span> Type of virus according to Baltimore classification

Double-stranded RNA viruses are a polyphyletic group of viruses that have double-stranded genomes made of ribonucleic acid. The double-stranded genome is used as a template by the viral RNA-dependent RNA polymerase (RdRp) to transcribe a positive-strand RNA functioning as messenger RNA (mRNA) for the host cell's ribosomes, which translate it into viral proteins. The positive-strand RNA can also be replicated by the RdRp to create a new double-stranded viral genome.

<span class="mw-page-title-main">Viral disease</span> Human, animal or plant disease resulting from a viral infection

A viral disease occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells.

<i>Picobirnavirus</i> Genus of viruses

Picobirnavirus is a genus of double-stranded RNA viruses. It is the only genus in the family Picobirnaviridae. Although amniotes, especially mammals, were thought to serve as hosts, it has been recently suggested that these viruses might infect bacteria and possibly some other invertebrates. There are three species in this genus. Associated symptoms include gastroenteritis in animals and humans, though the disease association is unclear.

<span class="mw-page-title-main">Iflaviridae</span> Family of viruses

Iflaviridae is a family of positive sense RNA viruses insect-infecting viruses. Some of the insects commonly infected by iflaviruses include aphids, leafhoppers, flies, bees, ants, silkworms and wasps. The name "Ifla" is derived from the name "Infectious flacherie virus", a member species. There is one genus (Iflavirus) and 16 species in this family.

<i>Picornavirales</i> Order of viruses

Picornavirales is an order of viruses with vertebrate, invertebrate, protist and plant hosts. The name has a dual etymology. First, picorna- is an acronym for poliovirus, insensitivity to ether, coxsackievirus, orphan virus, rhinovirus, and ribonucleic acid. Secondly, pico-, meaning extremely small, combines with RNA to describe these very small RNA viruses. The order comprises viruses that historically are referred to as picorna-like viruses.

Vesivirus is a genus of viruses, in the family Caliciviridae. Swine, sea mammals, and felines serve as natural hosts. There are two species in this genus. Diseases associated with this genus include: respiratory disease, Feline calicivirus (FCV); conjunctivitis, and respiratory disease.

<i>Lagovirus</i> Genus of viruses

Lagovirus is a genus of viruses, in the family Caliciviridae. Lagomorphs serve as natural hosts. There are two species in this genus. Diseases associated with this genus include: necrotizing hepatitis leading to fatal hemorrhages.

Nebovirus is a genus of viruses, in the family Caliciviridae. Bovine serve as natural hosts. There is only one species in this genus: Newbury 1 virus. Diseases associated with this genus include: Gastroenteritis.

Salivirus is a genus of viruses in the order Picornavirales, in the family Picornaviridae. Human and chimpanzee serve as natural hosts. There is only one species in this genus: Salivirus A. Diseases associated with this genus include: probably gastroenteritis.

Mammalian orthoreovirus (MRV) is a double-stranded RNA virus. It is a part of the family Reoviridae, as well as the subfamily Spinareovirinae. As seen in the name, the Mammalian Ortheoreovirus infects numerous mammalian species and vertebrates which serve as natural hosts. Some diseases that occur as a result of this virus or are associated with this virus include mild upper respiratory illness, and gastrointestinal illness. Examples of these are: upper respiratory tract syndromes, gastroenteritis, biliary atresia, obstructive hydrocephalus, jaundice, alopecia, conjunctivitis, and ‘oily hair’ associated with steatorrhea.

References

  1. ↑ "Caliciviridae - Caliciviridae - Positive-sense RNA Viruses - ICTV". talk.ictvonline.org. Retrieved 12 March 2021.
  2. ↑ Vinjé, J; Estes, MK; Esteves, P; Green, KY; Katayama, K; Knowles, NJ; L'Homme, Y; Martella, V; Vennema, H; White, PA; ICTV Report Consortium (November 2019). "ICTV Virus Taxonomy Profile: Caliciviridae". The Journal of General Virology. 100 (11): 1469–1470. doi: 10.1099/jgv.0.001332 . PMC   7011698 . PMID   31573467.
  3. 1 2 "ICTV Report Caliciviridae".
  4. 1 2 3 "Viral Zone". ExPASy. Retrieved 15 June 2015.
  5. ↑ T=1
  6. ↑ T=3
  7. 1 2 3 Hansman, GS, ed. (2010). Caliciviruses: Molecular and Cellular Virology. Caister Academic Press. ISBN   978-1-904455-63-9.
  8. ↑ Yu G, Zhang D, Guo F, Tan M, Jiang X, Jiang W (2013). "Cryo-EM structure of a novel calicivirus, Tulane Virus". PLoS One 8(3):e59817. doi : 10.1371/journal.pone.0059817
  9. ↑ "Virus Taxonomy: 2019 Release". talk.ictvonline.org. International Committee on Taxonomy of Viruses. Retrieved 30 April 2020.
  10. 1 2 3 4 Themes, U. F. O. (11 August 2016). "Caliciviridae: The Noroviruses". Basicmedical Key. Retrieved 12 March 2021.
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