Mumps virus

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Mumps orthorubulavirus
Mumps virus.jpg
TEM micrograph of a mumps virus particle
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(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Negarnaviricota
Class: Monjiviricetes
Order: Mononegavirales
Family: Paramyxoviridae
Genus: Orthorubulavirus
Species:
Mumps orthorubulavirus
Synonyms [1]
  • Mumps rubulavirus
  • Mumps virus

The mumps virus (MuV) is the virus that causes mumps. MuV contains a single-stranded, negative-sense genome made of ribonucleic acid (RNA). Its genome is about 15,000 nucleotides in length and contains seven genes that encode nine proteins. The genome is encased by a capsid that is in turn surrounded by a viral envelope. MuV particles, called virions, are pleomorphic in shape and vary in size from 100 to 600 nanometers in diameter. One serotype and twelve genotypes that vary in their geographic distribution are recognized. Humans are the only natural host of the mumps virus.

Contents

MuV replicates first by binding to the surface of cells, whereby its envelope merges with the host cell membrane to release the capsid inside of the cell. Once inside, the viral RNA-dependent RNA polymerase transcribes messenger RNA (mRNA) from the genome and later replicates the genome. After translation of viral proteins, virions are formed adjacent to the cell membrane, where they then leave the cell by budding from its surface, using the cell membrane as the envelope.

The mumps virus was first identified as the cause of mumps in 1934 and was first isolated in 1945. Within a few years after isolation, vaccines protecting against MuV infection had been developed. MuV was first recognized as a species in 1971, and it has been given the scientific name Mumps orthorubulavirus. It is assigned to the genus Orthorubulavirus in the subfamily Rubulavirinae , family Paramyxoviridae .

Characteristics

Genome

The mumps virus contains a nonsegmented, single-stranded, linear genome that is 15,384 nucleotides in length and made of ribonucleic acid (RNA). The genome has negative sense, so mRNA can be transcribed directly from the genome. Mumps virus encodes seven genes in the following order: [2] [3] [4]

The SH protein is thought to be involved in blocking NF(α)-mediated apoptosis of the host cell, which is done as an antiviral response to suppress the spread of viruses, though SH is not necessary for replication since MuVs engineered without SH are still able to replicate. The V protein is also involved in evading host antiviral responses by means of inhibiting production and signalling of interferons. Unlike the other proteins, the I protein's function is unknown. [2]

Structure

The genome of the mumps virus is encased by N proteins to form a flexible, loosely coiled helical ribonucleoprotein (RNP) complex consisting of the genome surrounded by a nucleocapsid that RdRp is bound to. RNPs are surrounded by an envelope, a lipid membrane, which contains two types of spikes on its surface that correspond to the HN and F glycoproteins. M proteins are found on the inner side of the envelope, connecting the envelope to the RNP. Virions vary in size from 100 to 600 nanometers (nm) in diameter and are pleomorphic in shape. [2] [5] [6]

Life cycle

MuV first interacts with a host cell by binding to its surface via the HN protein's receptor, sialic acid, which binds to sialic acid receptors on the surface of host cells. Following attachment, the F protein is triggered and begins fusing the viral envelope with the host cell's membrane. The F protein does so by changing from a metastable state to refolding to a more stable hairpin structure, which allows the contents of the virion, including the RNP, to be released into the host cell's cytoplasm. [2] [5] [6]

Upon entering the host cell, the RdRp begins transcribing mRNA from the genome inside the RNP. Transcription starts at or near the 3'-end (usually pronounced "three prime end") at a promoter region and moves sequentially toward the 5'-end. One mRNA strand is transcribed for each gene, and it is necessary for all genes sequentially before a gene to be transcribed for that gene to be transcribed. Genes closer to the 3'-end are transcribed at the highest frequency, decreasing in frequency as RdRp approaches the 5'-end. RdRp synthesizes a cap on the 5'-end of the mRNA and a polyadenylated tail on the 3'-end consisting of hundreds of consecutive adenines. Once a gene has been transcribed, RdRp releases it into the cytoplasm for subsequent translation of viral proteins by host ribosomes. [2] [6] [7] [8] The V and P proteins are encoded by the same gene, so while transcribing mRNA, RdRp edits the mRNA by inserting two non-templated guanines into the mRNA to transcribes mRNA for the P protein. [9]

Later in the replication cycle, once a sufficient number of nucleoproteins are present after translation, RdRp switches functions to replicate the genome. This occurs in a two-step process: first, a positive-sense antigenome is synthesized by RdRp from the negative-sense genome, and second, negative-sense genomic RNA strands are in turn synthesized by RdRp from the antigenome. During this process, the antigenome and newly replicated genomes are encapsidated by the nucleoprotein at the same time as replication. [2] [6] [8] Progeny genomes can be used for additional transcription or replication or may simply be packaged into progeny virions. [5]

HN and F proteins are synthesized in the endoplasmic reticulum and travel through the Golgi complex to the cell membrane, whether they bind to the cell membrane and protrude from the surface of the cell. M proteins bind to the sites of the cell membrane where HN and F proteins are, doing so at the positions where their "tails" protrude into the inside of the cell membrane in the cytoplasm. M proteins then act as a signals to newly synthesized RNPs as to where virions are to be formed. The interaction of RNP and M proteins is then thought to trigger budding from the host cell. [2] [5] [6] [10]

Budding from the host cell begins once M proteins recruit host class E proteins that form endosomal sorting complex required for transport (ESCRT) structures at the site of budding. There, ESCRT proteins form into concentric spirals and push the contents of the virion outward from the cell in the form of a vesicle that protrudes from the cell. The ESCRT proteins then constrict the opening of the vesicle and terminate budding by cutting off the vesicle from the rest of the membrane, forming a complete virion that is released from the host cell. [5] [10] [11] During this process, the neuraminidase of HN proteins aids in separation from the host membrane and prevents virion aggregation. [6]

Diversity

The mumps virus has one serotype and twelve genotypes. The genotypes can be distinguished based on the F, SH, are HN genes. The SH gene has a degree of variation between genotypes ranging from 5% to 21%, the highest among MuV's genes. The genotypes are named genotypes A to N, excluding E and M, i.e. genotypes A, B, C, D, F, G, H, I, J, K, L, and N. Genotypes E and M were previously recognized but were abolished due to phylogenetic analysis that MuVs assigned to them instead belonged genotypes C and K, respectively. [12] [13]

The different genotypes vary in frequency from region to region. For example, genotypes C, D, H, and J are more common in the western hemisphere, whereas genotypes F, G, and I are more common in Asia, although genotype G is considered to be a global genotype. Genotypes A and B have not been observed in the wild since the 1990s. This diversity of MuV is not reflected in the antibody response since because there is only one serotype, antibodies to one genotype are also functional against all others. [12] [14]

Evolution

The F, SH, HN genes, used to distinguish genotypes, are estimated to experience genetic mutations at a rate of 0.25 · 10−3 substitutions per site per year, which is considered to be a very low mutation rate for an RNA virus. [13] [15] [16] Phylogenetic analysis of the entire SH gene indicates that genotypes A and J are related in one branch and split apart from the other genotypes. In that second branch, genotype I is a sister clade of the other genotypes, which cluster into five sequential sister clades: G and H; D and K; C; L; and B, F, and N. [12]

Disease

Humans are the only natural host of the mumps virus, which causes mumps. The disease is transmitted via contact with respiratory secretions such as aerosolized droplets and saliva. Infection leads to fever, muscle pain, and painful swelling of the parotid glands, two salivary glands situated on the sides of the mouth in front of the ears. Infection may also involve many other tissues and organs, resulting in a variety of inflammatory reactions such as encephalitis, aseptic [17] meningitis, orchitis, myocarditis, pancreatitis, nephritis, oophoritis, and mastitis. Mumps is usually not life-threatening and typically resolves within a few weeks after the onset of symptoms, but long-term complications such as paralysis, seizures, hydrocephalus, and deafness can occur. Treatment is supportive in nature, and infection is preventable via vaccination. [2] [18] [19]

Classification

Mumps virus, scientific name Mumps orthorubulavirus, is assigned to the genus Orthorubulavirus , in the subfamily Rubulavirinae , family Paramyxoviridae . [1] Strains of MuV are named and classified using the following system: [12]

This system is used in sequential order. For example, MuVs/NewYork.USA/17.11[B] (VAC) is a vaccine-associated genotype B MuV derived from clinical material in New York City, and MuVi/London.GBR/3.12/2[G] is a genotype G MuV derived from cell culture in London. [12]

History

In 1934, mumps was identified as a viral disease by Claude D. Johnson and Ernest William Goodpasture. They found that rhesus macaques exposed to saliva taken from humans in the early stages of the disease developed mumps. Furthermore, they showed that mumps could be transferred to children via filtered and sterilized, bacteria-less preparations of macerated monkey parotid tissue, showing that it was a viral disease. [2] [20] The mumps virus was isolated for the first time in 1945 and by 1948 the first mumps vaccine had been developed. [20]

Initial vaccines contained inactivated virus particles and provided short-term protection against mumps. In the 1960s, Maurice Hilleman developed a more effective mumps vaccine using live virus particles that were taken from his then five-year-old infected daughter, Jeryl Lynn. This vaccine was approved for use in 1967 and recommended in 1977, replacing prior vaccines that were less effective. Hilleman would also work to develop the MMR vaccine in 1971, effective against measles, mumps, and rubella. The "Jeryl Lynn" strain of the mumps virus, which belongs to genotype A, [14] continues to be used in vaccines against mumps. [20]

Mumps virus was recognized as a species in 1971 by the International Committee on Taxonomy of Viruses (ICTV), which oversees virus taxonomy, when it was assigned to the genus Paramyxovirus. Since then, it has undergone numerous taxonomic changes and changes to its scientific name: [1] [21]

Etymology

The word "mumps" is first attested circa 1600 and is the plural form of "mump", meaning "grimace", originally a verb meaning "to whine or mutter like a beggar". The disease was likely called mumps in reference to the swelling caused by mumps parotitis, reflecting its impact on facial expressions as well as its causing of painful, difficult swallowing. "Mumps" was also used starting from the 17th century to mean "a fit of melancholy, sullenness, silent displeasure". [17] [22]

Related Research Articles

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

A retrovirus is a type of virus that inserts a DNA copy of its RNA genome into the DNA of a host cell that it invades, thus changing the genome of that cell. Once inside the host cell's cytoplasm, the virus uses its own reverse transcriptase enzyme to produce DNA from its RNA genome, the reverse of the usual pattern, thus retro (backwards). The new DNA is then incorporated into the host cell genome by an integrase enzyme, at which point the retroviral DNA is referred to as a provirus. The host cell then treats the viral DNA as part of its own genome, transcribing and translating the viral genes along with the cell's own genes, producing the proteins required to assemble new copies of the virus. Many retroviruses cause serious diseases in humans, other mammals, and birds.

<span class="mw-page-title-main">RNA virus</span> Subclass of viruses

An RNA virus is a virus—other than a retrovirus—that has ribonucleic acid (RNA) as its genetic material. The nucleic acid is usually single-stranded RNA (ssRNA) but it may be double-stranded (dsRNA). Notable human diseases caused by RNA viruses include the common cold, influenza, SARS, MERS, Covid-19, Dengue Virus, hepatitis C, hepatitis E, West Nile fever, Ebola virus disease, rabies, polio, mumps, and measles.

<span class="mw-page-title-main">Mumps</span> Human disease caused by paramyxovirus

Mumps is a viral disease caused by the mumps virus. Initial symptoms are non-specific and include fever, headache, malaise, muscle pain, and loss of appetite. These symptoms are usually followed by painful swelling of the parotid glands, called parotitis, which is the most common symptom of infection. Symptoms typically occur 16 to 18 days after exposure to the virus and resolve within two weeks. About one third of infections are asymptomatic.

<i>Paramyxoviridae</i> Family of viruses

Paramyxoviridae is a family of negative-strand RNA viruses in the order Mononegavirales. Vertebrates serve as natural hosts. Diseases associated with this family include measles, mumps, and respiratory tract infections. The family has four subfamilies, 17 genera, and 78 species, three genera of which are unassigned to a subfamily.

<i>Henipavirus</i> Genus of RNA viruses

Henipavirus is a genus of negative-strand RNA viruses in the family Paramyxoviridae, order Mononegavirales containing six established species, and numerous others still under study. Henipaviruses are naturally harboured by several species of small mammals, notably pteropid fruit bats, microbats of several species, and shrews. Henipaviruses are characterised by long genomes and a wide host range. Their recent emergence as zoonotic pathogens capable of causing illness and death in domestic animals and humans is a cause of concern.

<i>Mononegavirales</i> Order of viruses

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<i>Measles morbillivirus</i> Species of virus

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<span class="mw-page-title-main">Rabies virus</span> Species of virus

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<span class="mw-page-title-main">Viral replication</span> Formation of biological viruses during the infection process

Viral replication is the formation of biological viruses during the infection process in the target host cells. Viruses must first get into the cell before viral replication can occur. Through the generation of abundant copies of its genome and packaging these copies, the virus continues infecting new hosts. Replication between viruses is greatly varied and depends on the type of genes involved in them. Most DNA viruses assemble in the nucleus while most RNA viruses develop solely in cytoplasm.

<i>Gammaretrovirus</i> Genus of viruses

Gammaretrovirus is a genus in the Retroviridae family. Example species are the murine leukemia virus and the feline leukemia virus. They cause various sarcomas, leukemias and immune deficiencies in mammals, reptiles and birds.

Rous sarcoma virus (RSV) is a retrovirus and is the first oncovirus to have been described. It causes sarcoma in chickens.

The murine leukemia viruses are retroviruses named for their ability to cause cancer in murine (mouse) hosts. Some MLVs may infect other vertebrates. MLVs include both exogenous and endogenous viruses. Replicating MLVs have a positive sense, single-stranded RNA (ssRNA) genome that replicates through a DNA intermediate via the process of reverse transcription.

Turkeypox virus is a virus of the family Poxviridae and the genus Avipoxvirus that causes turkeypox. It is one of the most common diseases in the wild turkey population. Turkeypox, like all avipoxviruses, is transmitted either through skin contact or by arthropods acting as mechanical vectors.

Mason-Pfizer monkey virus (M-PMV), formerly Simian retrovirus (SRV), is a species of retroviruses that usually infect and cause a fatal immune deficiency in Asian macaques. The ssRNA virus appears sporadically in mammary carcinoma of captive macaques at breeding facilities which expected as the natural host, but the prevalence of this virus in feral macaques remains unknown. M-PMV was transmitted naturally by virus-containing body fluids, via biting, scratching, grooming, and fighting. Cross contaminated instruments or equipment (fomite) can also spread this virus among animals.

<i>Pneumoviridae</i> Family of viruses

Pneumoviridae is a family of negative-strand RNA viruses in the order Mononegavirales. Humans, cattle, and rodents serve as natural hosts. Respiratory tract infections are associated with member viruses such as human respiratory syncytial virus. There are five species in the family which are divided between the genera Metapneumovirus and Orthopneumovirus. The family used to be considered as a sub-family of Paramyxoviridae, but has been reclassified as of 2016.

<i>Avian metaavulavirus 2</i> Species of virus

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<span class="mw-page-title-main">Negative-strand RNA virus</span> Phylum of viruses

Negative-strand RNA viruses are a group of related viruses that have negative-sense, single-stranded genomes made of ribonucleic acid. They have genomes that act as complementary strands from which messenger RNA (mRNA) is synthesized by the viral enzyme RNA-dependent RNA polymerase (RdRp). During replication of the viral genome, RdRp synthesizes a positive-sense antigenome that it uses as a template to create genomic negative-sense RNA. Negative-strand RNA viruses also share a number of other characteristics: most contain a viral envelope that surrounds the capsid, which encases the viral genome, −ssRNA virus genomes are usually linear, and it is common for their genome to be segmented.

Bat mumps orthorubulavirus, formerly Bat mumps rubulavirus (BMV), is a member of genus Orthorubulavirus, family Paramyxoviridae, and order Mononegavirales. Paramyxoviridae viruses were first isolated from bats using heminested PCR with degenerate primers. This process was then followed by Sanger sequencing. A specific location of this virus is not known because it was isolated from bats worldwide. Although multiple paramyxoviridae viruses have been isolated worldwide, BMV specifically has not been isolated thus far. However, BMV was detected in African fruit bats, but no infectious form has been isolated to date. It is known that BMV is transmitted through saliva in the respiratory system of bats. While the virus was considered its own species for a few years, phylogenetic analysis has since shown that it is a member of Mumps orthorubulavirus.

<i>Orthornavirae</i> Kingdom of viruses

Orthornavirae is a kingdom of viruses that have genomes made of ribonucleic acid (RNA), those genomes encoding an RNA-dependent RNA polymerase (RdRp). The RdRp is used to transcribe the viral RNA genome into messenger RNA (mRNA) and to replicate the genome. Viruses in this kingdom also share a number of characteristics involving evolution, including high rates of genetic mutations, recombinations, and reassortments.

References

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