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of or resembling an endogen
derived or originating internally (同)endogenic
any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/01/22 18:29:07」(JST)

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Dendrogram of various classes of endogenous retroviruses

Endogenous retroviruses (ERVs) are endogenous viral elements in the genome that closely resemble and can be derived from retroviruses. They are abundant in the genomes of jawed vertebrates and they occupy as much as 4.9% of the human genome.^[1] ERVs are a subclass of a type of gene called a transposon which is able to be packaged and moved within the genome to serve a vital role in gene expression and regulation.^[2]^[3] Researchers suggest that retroviruses have evolved from a type of transposable gene called a retrotransposon which includes ERVs; these genes can mutate and instead of moving to another location in the genome they can become exogenous/pathogenic. This means that all ERVs may not have originated as an insertion by a retrovirus but rather some may have been the source of origin for the genetic information in the retroviruses they resemble.^[4]

Formation

The replication cycle of a retrovirus entails the insertion ("integration") of a DNA copy of the viral genome into the nuclear genome of the host cell. Most retroviruses infect somatic cells, but occasional infection of germline cells (cells that produce eggs and sperm) can also occur. Rarely, retroviral integration may occur in a germline cell that goes on to develop into a viable organism. This organism will carry the inserted retroviral genome as an integral part of its own genome - an "endogenous" retrovirus (ERV) that may be inherited by its offspring as a novel allele. Many ERVs have persisted in the genome of their hosts for millions of years. However, most of these have acquired inactivating mutations during host DNA replication and are no longer capable of producing virus. ERVs can also be partially excised from the genome by a process known as recombinational deletion, in which recombination between the identical sequences that flank newly integrated retroviruses results in deletion of the internal, protein-coding regions of the viral genome.

Role in genome evolution

Endogenous retroviruses can play an active role in shaping genomes. Most studies in this area have focused on the genomes of humans and higher primates, but other vertebrates, such as mice and sheep, have also been studied in depth.^[5]^[6]^[7]^[8] The long terminal repeat (LTR) sequences that flank ERV genomes frequently act as alternate promoters and enhancers, often contributing to the transcriptome by producing tissue-specific variants. In addition, the retroviral proteins themselves have been co-opted to serve novel host functions, particularly in reproduction and development. Recombination between homologous retroviral sequences has also contributed to gene shuffling and the generation of genetic variation. Furthermore, in the instance of potentially antagonistic effects of retroviral sequences, repressor genes have co-evolved to combat them.

Solo LTRs and LTRs associated with complete retroviral sequences have been shown to act as transcriptional elements on host genes. Their range of action is mainly by insertion into the 5’ UTRs of protein coding genes; however, they have been known to act upon genes up to 70–100 kb away.^[5]^[9]^[10]^[11] The majority of these elements are inserted in the sense direction to their corresponding genes, but there has been evidence of LTRs acting in the antisense direction and as a bidirectional promoter for neighboring genes.^[12]^[13] In a few cases, the LTR functions as the major promoter for the gene. For example, in humans AMY1C has a complete ERV sequence in its promoter region; the associated LTR confers salivary specific expression of the digestive enzyme amylase.^[14] Also, the primary promoter for bile acid-CoA:amino acid N-acyltransferase (BAAT), which codes for an enzyme that is integral in bile metabolism, is of LTR origin.^[10]^[15]

Interestingly, the insertion of a solo ERV-9 LTR may have produced a functional open reading frame (ORF), causing the rebirth of the human immunity related GTPase gene (IRGM).^[16] ERV insertions have also been shown to generate alternative splice sites either by direct integration into the gene, as with the human leptin hormone receptor, or driven by the expression of an upstream LTR, as with the phospholipase A-2 like protein.^[17]

However, in the majority of cases, the LTR functions as one of many alternate promoters, often conferring tissue-specific expression related to reproduction and development. In fact, 64% of known LTR-promoted transcription variants are expressed in reproductive tissues.^[18] For example, the gene CYP19 codes for aromatase P450, an important enzyme for estrogen synthesis, that is normally expressed in the brain and reproductive organs of most mammals.^[10] However, in primates, an LTR-promoted transcriptional variant confers expression to the placenta and is responsible for controlling estrogen levels during pregnancy.^[10] Furthermore, the neuronal apoptosis inhibitory protein (NAIP), normally widespread, has an LTR of the HERV-P family acting as a promoter that confers expression to the testis and prostate.^[19] Other proteins, such as nitric acid synthase 3 (NOS3), interleukin-2 receptor B (IL2RB), and another mediator of estrogen synthesis, HSD17B1, are also alternatively regulated by LTRs that confer placental expression, but their specific functions are not yet known.^[15]^[20] The high degree of reproductive expression is thought to be an aftereffect of the method by which they were endogenized; however, this also may be due to a lack of DNA methylation in germ-line tissues.^[15]

The most well-characterized instance of placental protein expression comes not from an alternatively promoted host gene, but from a complete co-option of a retroviral protein. It is well documented that retroviral fusogenic env proteins, which play a role in the entry of the virion into the host cell, have had an important impact on the development of mammalian placenta. In humans, and other mammals, intact env proteins called syncytins are responsible for the formation and function of syncytiotrophoblasts.^[7] These multi-nucleated cells are mainly responsible for maintaining nutrient exchange and protecting the developing fetus from the mother's immune system.^[7] It has been suggested that the selection and fixation of these proteins for this function have played a critical role in the evolution of viviparity.^[21]

In addition, the insertion of ERVs, and their respective LTRs, has the potential to induce chromosomal rearrangement due to recombination between viral sequences at inter-chromosomal loci. These rearrangements have been shown to induce gene duplications and deletions that largely contribute to genome plasticity and dramatically change the dynamic of gene function.^[22] Furthermore, retroelements in general are largely prevalent in rapidly evolving, mammal-specific gene families whose function is largely related to the response to stress and external stimuli.^[10] In particular, both human class I and class II MHC genes have a high density of HERV elements as compared to other multi-locus-gene families.^[17] It has been shown that HERVs have contributed to the formation of extensively duplicated duplicon blocks that make up the HLA class 1 family of genes.^[23] More specifically, HERVs primarily occupy regions within and between the break points between these blocks, suggesting that considerable duplication and deletions events, typically associated with unequal crossover, facilitated their formation.^[24] The generation of these blocks, inherited as immunohaplotypes, act as a protective polymorphism against a wide range of antigens that may have imbued humans with an advantage over other primates.^[23]

Finally, the insertion of ERVs or ERV elements into genic regions of host DNA, or overexpression of their transcriptional variants, has a much higher potential to produce deleterious effects than positive ones. Their appearance into the genome has created a host-parasite co-evolutionary dynamic that proliferated the duplication and expansion of repressor genes. The most clear-cut example of this involves the rapid duplication and proliferation of tandem zinc-finger genes in mammal genomes. Zinc-finger genes, particularly those that include a KRAB domain, exist in high copy number in vertebrate genomes, and their range of functions are limited to transcriptional roles.^[25] However, it has been shown that in mammals, the diversification of these genes was due to multiple duplication and fixation events in response to new retroviral sequences or their endogenous copies to repress their transcription.^[11]

Role in disease

The majority of ERVs that occur in vertebrate genomes are ancient, inactivated by mutation, and have reached genetic fixation in their host species. For these reasons, they are extremely unlikely to have negative effects on their hosts except under unusual circumstances. Nevertheless, it is clear from studies in birds and non-human mammal species including mice, cats and koalas, that younger (i.e., more recently integrated) ERVs can be associated with disease. This has led researchers to propose a role for ERVs in several forms of human cancer and autoimmune disease, although conclusive evidence is lacking.^[26]^[27]^[28]

In humans, ERVs have been proposed to be involved in multiple sclerosis (MS). A specific association between MS and the ERVWE1, or "syncytin", gene, which is derived from an ERV insertion, has been reported, along with the presence of an "MS-associated retrovirus" (MSRV), in patients with the disease.^[29]^[30] Human ERVs (HERVs) have also been implicated in ALS.^[31]

In 2004 it was reported that antibodies to HERVs were found in greater frequency in the sera of people with schizophrenia. Additionally, the cerebrospinal fluid of people with recent onset schizophrenia contained levels of a retroviral marker, reverse transcriptase, four times higher than control subjects.^[32] Researchers continue to look at a possible link between HERVs and schizophrenia, with the additional possibility of a triggering infection inducing schizophrenia.^[33]

Human endogenous retroviruses

Human endogenous retrovirus (HERV) proviruses comprise a significant part of the human genome, with approximately 98,000 ERV elements and fragments making up nearly 8%.^[34] According to a study published in 2005, no HERVs capable of replication had been identified; all appeared to be defective, containing major deletions or nonsense mutations. This is because most HERVs are merely traces of original viruses, having first integrated millions of years ago. However, one family of viruses has been active since the divergence of humans and chimpanzees. This family, termed HERV-K (HML2), makes up less than 1% of HERV elements but is one of the most studied. There are indications it has even been active in the past few hundred thousand years, e.g., some human individuals carry more copies of HML2 than others.^[35] Traditionally, age estimates of HERVs are performed by comparing the 5' and 3' LTR of a HERV; however, this method is only relevant for full-length HERVs. A recent method, called cross-sectional dating,^[36] uses variations within a single LTR to estimate the ages of HERV insertions. This method is more precise in estimating HERV ages and can be used for any HERV insertions. Cross-sectional dating has been used to suggest that two members of HERV-K(HML2), HERV-K106 and HERV-K116, were active in the last 800,000 years and that HERV-K106 may have infected modern humans 150,000 years ago.^[37] However, the absence of known infectious members of the HERV-K(HML2) family, and the lack of elements with a full coding potential within the published human genome sequence, suggests to some that the family is less likely to be active at present. In 2006 and 2007, researchers working independently in France and the USA recreated functional versions of HERV-K(HML2).^[38]^[39]

Immunological studies have shown some evidence for T cell immune responses against HERVs in HIV-infected individuals.^[40] The hypothesis that HIV induces HERV expression in HIV-infected cells led to the proposal that a vaccine targeting HERV antigens could specifically eliminate HIV-infected cells. The potential advantage of this novel approach is that, by using HERV antigens as surrogate markers of HIV-infected cells, it could circumvent the difficulty inherent in directly targeting notoriously diverse and fast-mutating HIV antigens.

There are a few classes of human endogenous retroviruses that still have intact open reading frames. For example, the expression of HERV-K, a biologically active family of HERV, produces proteins found in placenta. Furthermore, the expression of the envelope genes of HERV-W (ERVW-1)and HERV-FRD (ERVFRD-1) produces syncytins which are important for the generation of the syncytiotrophoblast cell layer during placentogenesis by inducing cell-cell fusion.^[41] The HUGO Gene Nomenclature Committee (HGNC) approves gene symbols for transcribed human ERVs.^[42]

References

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External links

Endogenous Retroviruses at the US National Library of Medicine Medical Subject Headings (MeSH)
HERVd - human endogenous retrovirus database
Retrosearch

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★リンクテーブル★

リンク元	「HERV」「内在性レトロウイルス」
拡張検索	「human endogenous retrovirus」「porcine endogenous retrovirus」
関連記事	「endogenous」「retrovirus」