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|Transmission electron micrograph of two adenovirus particles|
Adenoviruses (members of the family Adenoviridae) are medium-sized (90–100 nm), nonenveloped (without an outer lipid bilayer) viruses with an icosahedral nucleocapsid containing a double stranded DNA genome. Their name derives from their initial isolation from human adenoids in 1953.
They have a broad range of vertebrate hosts; in humans, more than 50 distinct adenoviral serotypes have been found to cause a wide range of illnesses, from mild respiratory infections in young children (known as the common cold) to life-threatening multi-organ disease in people with a weakened immune system.
- Genus Atadenovirus; type species: Ovine atadenovirus D
- Genus Aviadenovirus; type species: Fowl aviadenovirus A
- Genus Ichtadenovirus; type species: Sturgeon ichtadenovirus A
- Genus Mastadenovirus (including all human adenoviruses); type species: Human mastadenovirus C
- Genus Siadenovirus; type species: Frog siadenovirus A
Classification of Adenoviridae can be complex.
In humans, currently there are 88 human adenoviruses (HAdVs) in seven species (Human adenovirus A to G):
- A: 12, 18, 31
- B: 3, 7, 11, 14, 16, 21, 34, 35, 50, 55
- C: 1, 2, 5, 6, 57
- D: 8, 9, 10, 13, 15, 17, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 33, 36, 37, 38, 39, 42, 43, 44, 45, 46, 47, 48, 49, 51, 53, 54, 56, 58, 59, 60, 62, 63, 64, 65, 67, 69, 70, 71, 72, 73, 74, 75
- E: 4
- F: 40, 41
- G: 52
Different types/serotypes are associated with different conditions:
- respiratory disease (mainly species HAdV-B and C)
- conjunctivitis (HAdV-B and D)
- gastroenteritis (HAdV-F types 40, 41, HAdV-G type 52)
- obesity or adipogenesis (HAdV-A type 31, HAdV-C type 5, HAdV-D types 9, 36, 37) 
Adenoviruses represent the largest known non-enveloped viruses. They are able to be transported through the endosome (i.e., envelope fusion is not necessary). The virion also has a unique "spike" or fiber associated with each penton base of the capsid (see picture below) that aids in attachment to the host cell via the receptor on the surface of the host cell. (See Replication Section below for discussion of diverse receptors.)
In 2010, scientists announced that they had solved the structure of the human adenovirus at the atomic level, making the largest high-resolution model ever. The virus is composed of around 1 million amino acid residues and weighs around 150 MDa.
The adenovirus genome is linear, non-segmented double-stranded (ds) DNA that is between 26 and 48 Kbp. This allows the virus to theoretically carry 22 to 40 genes. Although this is significantly larger than other viruses in its Baltimore group, it is still a very simple virus and is heavily reliant on the host cell for survival and replication. An interesting feature of this viral genome is that it has a terminal 55 kDa protein associated with each of the 5' ends of the linear dsDNA. These are used as primers in viral replication and ensure that the ends of the virus' linear genome are adequately replicated.
Entry of adenoviruses into the host cell involves two sets of interactions between the virus and the host cell. Most of the action occurs at the vertices. Entry into the host cell is initiated by the knob domain of the fiber protein binding to the cell receptor. The two currently established receptors are: CD46 for the group B human adenovirus serotypes and the coxsackievirus adenovirus receptor (CAR) for all other serotypes. There are some reports suggesting MHC molecules and sialic acid residues functioning in this capacity as well. This is followed by a secondary interaction, where a motif in the penton base protein (see capsomere) interacts with an integrin molecule. It is the co-receptor interaction that stimulates entry of the adenovirus. This co-receptor molecule is αv integrin. Binding to αv integrin results in endocytosis of the virus particle via clathrin-coated pits. Attachment to αv integrin stimulates cell signaling and thus induces actin polymerization resulting in entry of the virion into the host cell within an endosome.
Once the virus has successfully gained entry into the host cell, the endosome acidifies, which alters virus topology by causing capsid components to disband. The capsid is destabilized and non sequitur] is released from the capsid. These changes, as well as the toxic nature of the pentons, destroy the endosome, resulting in the movement of the virion into the cytoplasm. With the help of cellular microtubules, the virus is transported to the nuclear pore complex, whereby the adenovirus particle disassembles. Viral DNA is subsequently released, which can enter the nucleus via the nuclear pore. After this the DNA associates with histone molecules. Thus, viral gene expression can occur and new virus particles can be generated.[
The adenovirus life cycle is separated by the DNA replication process into two phases: an early and a late phase. In both phases, a primary transcript that is alternatively spliced to generate monocistronic mRNAs compatible with the host's ribosome is generated, allowing for the products to be translated.
The early genes are responsible for expressing mainly non-structural, regulatory proteins. The goal of these proteins is threefold: to alter the expression of host proteins that are necessary for DNA synthesis; to activate other virus genes (such as the virus-encoded DNA polymerase); and to avoid premature death of the infected cell by the host-immune defenses (blockage of apoptosis, blockage of interferon activity, and blockage of MHC class I translocation and expression).
Some adenoviruses under specialized conditions can transform cells using their early gene products. E1A (binds Retinoblastoma tumor suppressor protein) has been found to immortalize primary cells in vitro allowing E1B (binds p53 tumor suppressor) to assist and stably transform the cells. Nevertheless, they are reliant upon each other to successfully transform the host cell and form tumors.
DNA replication separates the early and late phases. Once the early genes have liberated adequate virus proteins, replication machinery, and replication substrates, replication of the adenovirus genome can occur. A terminal protein that is covalently bound to the 5’ end of the adenovirus genome acts as a primer for replication. The viral DNA polymerase then uses a strand displacement mechanism, as opposed to the conventional Okazaki fragments used in mammalian DNA replication, to replicate the genome.
The late phase of the adenovirus lifecycle is focused on producing sufficient quantities of structural protein to pack all the genetic material produced by DNA replication. Once the viral components have successfully been replicated, the virus is assembled into its protein shells and released from the cell as a result of virally induced cell lysis.
Adenovirus is capable of multiplicity reactivation (MR) (Yamamoto and Shimojo, 1971). MR is the process by which two, or more, virus genomes containing lethal damage interact within the infected cell to form a viable virus genome. Such MR was demonstrated for adenovirus 12 after virions were irradiated with UV light and allowed to undergo multiple infection of host cells. In a review, numerous examples of MR in different viruses were described, and it was suggested that MR is a common form of sexual interaction that provides the survival advantage of recombinational repair of genome damages.
Adenoviruses are unusually stable to chemical or physical agents and adverse pH conditions, allowing for prolonged survival outside of the body and water. Adenoviruses are spread primarily via respiratory droplets, however they can also be spread by fecal routes. Research into the molecular mechanisms underlying adenoviral transmission provide empirical evidence in support of the hypothesis that cellular receptors for adenovirus and coxsackievirus (CARs) are needed to transport adenoviruses into certain naive/progenitor cell types.
Humans infected with adenoviruses display a wide range of responses, from no symptoms at all to the severe infections typical of Adenovirus serotype 14.
Bat adenovirus TJM (Bt-AdV-TJM) is a novel species of the Mastadenovirus genus isolated from Myotis and Scotophilus kuhlii in China. It is most closely related to the tree shrew and canine AdVs.
Two types of canine adenoviruses are well known, type 1 and 2. Type 1 (CAdV-1) causes infectious canine hepatitis, a potentially fatal disease involving vasculitis and hepatitis. Type 1 infection can also cause respiratory and eye infections. CAdV-1 also affects foxes (Vulpes vulpes and Vulpes lagopus) and may cause hepatitis and encephalitis. Canine adenovirus 2 (CAdV-2) is one of the potential causes of kennel cough. Core vaccines for dogs include attenuated live CAdV-2, which produces immunity to CAdV-1 and CAdV-2. CAdV-1 was initially used in a vaccine for dogs, but corneal edema was a common complication.
Squirrel adenovirus (SqAdV) is reported to cause enteritis in red squirrels in Europe, while gray squirrels seem to be resistant. SqAdV is most closely related to the adenovirus of guinea pigs (GpAdV).
Adenovirus in reptiles is poorly understood, but research is currently in progress.
Adenoviruses are also known to cause respiratory infections in horses, cattle, pigs, sheep, and goats. Equine adenovirus 1 can also cause fatal disease in immunocompromised Arabian foals, involving pneumonia and destruction of pancreatic and salivary gland tissue. Tupaia adenovirus (TAV) (tree shrew adenovirus 1) has been isolated from tree shrews.
The fowl adenoviruses are associated with many disease conditions in domestic fowl like inclusion body hepatitis, hydropericardium syndrome, Egg drop syndrome, Quail bronchitis, Gizzard erosions and many respiratory conditions. They have also been isolated from wild black kites (Milvus migrans).
Currently, there is a vaccine for adenovirus type 4 and 7 for military personnel only. Military personnel are the recipients of this vaccine because they may be at a higher risk of infection. The vaccine contains a live virus, which may be shed in stool and lead to transmission. There is currently no adenovirus vaccine for the general public. The vaccine is not approved for use outside of the military, as it has not been tested in studied in the general population or on people with weakened immune systems.
In the past, US military recruits were vaccinated against two serotypes of adenovirus, with a corresponding decrease in illnesses caused by those serotypes. That vaccine is no longer manufactured. The U.S. Army Medical Research and Materiel Command announced on 31 October 2011 that a new adenovirus vaccine, which replaces the older version that has been out of production for over a decade, was shipped to basic training sites Oct. 18, 2011. More information is available here.
Prevention of adenovirus, as well as other respiratory illnesses, involves frequent hand washing for more than 20 seconds, avoiding touching the eyes, face, and nose with unwashed hands, and avoiding close contact with people with symptomatic adenovirus infection. Those with symptomatic adenovirus infection are additionally advised to cough or sneeze into the arm or elbow instead of the hand, to avoid sharing cups and eating utensils, and to refrain from kissing others. Chlorination of swimming pools can prevent outbreaks of conjunctivitis caused by adenovirus.
Diagnosis is from symptoms and history. Tests are only necessary in very serious cases. Tests include blood tests, eyes, nose or throat swabs, stool sample tests, and chest x-rays. In the laboratory, adenovirus can be identified with antigen detection, polymerase chain reaction (PCR), virus isolation and serology. Even if adenovirus is found to be present, it may not be the cause of any symptoms. Some immunocompromised individuals can shed the virus for weeks and show no symptoms.
Most infections with adenovirus result in infections of the upper respiratory tract. Adenovirus infections often present as conjunctivitis, tonsillitis (which may look exactly like strep throat and cannot be distinguished from strep except by throat culture), an ear infection, or croup. Adenoviruses types 40 and 41 can also cause gastroenteritis. A combination of conjunctivitis and tonsillitis is particularly common with adenovirus infections.
Some children (especially the youngest) can develop adenovirus bronchiolitis or pneumonia, both of which can be severe. In babies, adenoviruses can also cause coughing fits that look almost exactly like whooping cough. Adenoviruses can also cause viral meningitis or encephalitis. Rarely, adenovirus can cause hemorrhagic cystitis (inflammation of the urinary bladder—a form of urinary tract infection—with blood in the urine).
Most people recover from adenovirus infections by themselves, but people with immunodeficiency sometimes die of adenovirus infections, and—rarely—even previously healthy people can die of these infections. This may be because sometimes adenoviral infection can lead to cardiac disorders. For example, in one study, some cardiac samples of patients with dilated cardiomyopathy were positive for presence of adenovirus type 8.
Adenoviruses are often transmitted by expectorate, but can also be transmitted by contact with an infected person, or by virus particles left on objects such as towels and faucet handles. Some people with adenovirus gastroenteritis may shed the virus in their stools for months after getting over the symptoms. The virus can be passed through water in swimming pools that are not sufficiently chlorinated.
There are no proven antiviral drugs to treat adenoviral infections, so treatment is largely directed at the symptoms (such as acetaminophen for fever). The antiviral drug cidofovir has helped certain of those patients who had severe cases of illness; the number helped and to what degree, and the particular complications or symptoms it helped with, and when and where this happened, were not given in the source. A doctor may give antibiotic eyedrops for conjunctivitis, while awaiting results of bacterial cultures, and to help prevent secondary bacterial infections. Currently, there is no adenovirus vaccine available to the general public, but a vaccine is available for the United States military for Types 4 and 7.
Use in gene therapy and vaccination
Adenoviruses have long been a popular viral vector for gene therapy due to their ability to affect both replicating and non-replicating cells, accommodate large transgenes, and code for proteins without integrating into the host cell genome. More specifically, they are used as a vehicle to administer targeted therapy, in the form of recombinant DNA or protein. This therapy has been found especially useful in treating monogenic disease (e.g. cystic fibrosis, X-linked SCID, alpha1-antitrypsin deficiency) and cancer. In China, oncolytic adenovirus is an approved cancer treatment. Specific modifications on fibre proteins are used to target Adenovirus to certain cell types; a major effort is made to limit hepatotoxicity and prevent multiple organ failure. Adenovirus dodecahedron can qualify as a potent delivery platform for foreign antigens to human myeloid dendritic cells (MDC), and that it is efficiently presented by MDC to M1-specific CD8+ T lymphocytes.
Adenovirus has been used for delivery of CRISPR/Cas9 gene editing systems, but high immune reactivity to viral infection has posed challenges in use for patients. Use of adeno-associated virus (AAV) shows promise in overcoming immunogenicity, though it has a smaller payload capacity.
Modified (recombinant) adenovirus vectors, including replication incompetent types, theoretically can deliver DNA coding for specific antigens, but as of May 2020 the technology had "yet to yield an effective vaccine for humans".
Recombinant adenovirus type-5 (Ad5) (Ad5-nCoV, ImmunityBio, UQ-CSL V451) and adenovirus type-26 (Ad26) (Ad26.COV2.S) are being used in candidate COVID-19 vaccines. The Gam-COVID-Vac (aka Sputnik-5) product is innovative because an Ad26 based vaccine is used on the first day and an Ad5 vaccine is used on day 21. "In four candidate COVID-19 vaccines... Ad5... serves as the 'vector' to [transport] the surface protein gene of SARS-CoV-2". The goal is to genetically express the spike glycoprotein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
A replication-deficient chimpanzee adenovirus vaccine vector (ChAdOx1) is being used in a trial of a COVID-19 vaccine. The vaccine is known as ChAdOx1 nCoV-19 (Jenner Institute) or AZD1222 (AstraZeneca). Another one is ChAd-SARS-CoV-2-S; the vaccine reportedly prevented mice that were genetically modified to have human ACE2 (hACE2) receptors, presumbably receptors that allow virus-entry into the cells, from being infected with SARS-CoV-2.
Possible issues with using Adenovirus as vaccine vectors include: the human body develops immunity to the vector itself, making subsequent booster shots difficult or impossible. In some cases, people have pre-existing immunity to Adenoviruses, making vector delivery ineffective.
The use of Ad5 vaccines for COVID-19 worried researchers who had experience with failed trials of an Ad5 vaccine, due to the increased risk for male patients of contracting HIV-1. In October 2020, they wrote in The Lancet: "On the basis of these findings, we are concerned that use of an Ad5 vector for immunisation against SARS-CoV-2 could similarly increase the risk of HIV-1 acquisition among men who receive the vaccine."
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