Abstract
Endogenous retroviruses represent about 8% of the human genome and belong to the superfamily of transposable and retrotransposable genetic elements. Altogether, these mobile genetic elements and their numerous inactivated “junk” sequences represent nearly one half of the human DNA. Nonetheless, a significant part of this “non-conventional” genome has retained potential activity. Epigenetic control is notably involved in silencing most of these genetic elements but certain environmental factors such as viruses are known to dysregulate their expression in susceptible cells. More particularly, embryonal cells with limited gene methylation are most susceptible to uncontrolled activation of these mobile genetic elements by, e.g., viral infections. In particular, certain viruses transactivate promoters from endogenous retroviral family type W (HERV-W). HERV-W RNA was first isolated in circulating viral particles (Multiple Sclerosis-associated RetroViral element, MSRV) that have been associated with the evolution and prognosis of multiple sclerosis. HERV-W elements encode a powerful immunopathogenic envelope protein (ENV) that activates a pro-inflammatory and autoimmune cascade through interaction with Toll-like receptor 4 on immune cells. This ENV protein has repeatedly been detected in MS brain lesions and may be involved in other diseases. Epigenetic factors controlling HERV-W ENV protein expression then reveal critical. This review addresses the gene–environment epigenetic interface of such HERV-W elements and its potential involvement in disease.
This is a preview of subscription content, access via your institution.





References
Haahr S, Sommerlund M, Moller-Larsen A, Nielsen R, Hansen HJ (1991) Just another dubious virus in cells from a patient with multiple sclerosis? Lancet 337:863–864
Perron H, Geny C, Laurent A et al (1989) Leptomeningeal cell line from multiple sclerosis with reverse transcriptase activity and viral particles. Res Virol 140:551–561
Perron H, Lalande B, Gratacap B et al (1991) Isolation of retrovirus from patients with multiple sclerosis. Lancet 337:862–863
Koprowski H, DeFreitas EC, Harper ME et al (1985) Multiple sclerosis and human T-cell lymphotropic retroviruses. Nature 318:154–160
Haahr S, Sommerlund M, Christensen T, Jensen AW, Hansen HJ, Moller-Larsen A (1994) A putative new retrovirus associated with multiple sclerosis and the possible involvement of Epstein–Barr virus in this disease. Ann N Y Acad Sci 724:148–156
Perron H, Firouzi R, Tuke P et al (1997) Cell cultures and associated retroviruses in multiple sclerosis. Collaborative Research Group on MS. Acta Neurol Scand Suppl 169:22–31
Perron H, Geny C, Gratacap B et al (1991) Isolations of an unknown retrovirus from CSF, blood and brain from patients with multiple sclerosis. In: Wiethölter H (ed) Current concepts in multiple sclerosis. Elsevier, Amsterdam, pp 111–116
Perron H, Gratacap B, Lalande B et al (1992) In vitro transmission and antigenicity of a retrovirus isolated from a multiple sclerosis patient. Res Virol 143:337–350
Sommerlund M, Pallesen G, Moller-Larsen A, Hansen HJ, Haahr S (1993) Retrovirus-like particles in an Epstein–Barr virus-producing cell line derived from a patient with chronic progressive myelopathy. Acta Neurol Scand 87:71–76
Perron H, Garson JA, Bedin F et al (1997) Molecular identification of a novel retrovirus repeatedly isolated from patients with multiple sclerosis. The Collaborative Research Group on Multiple Sclerosis. Proc Natl Acad Sci USA 94:7583–7588
Tuke PW, Perron H, Bedin F, Beseme F, Garson JA (1997) Development of a pan-retrovirus detection system for multiple sclerosis studies. Acta Neurol Scand Suppl 169:16–21
Komurian-Pradel F, Paranhos-Baccala G, Bedin F et al (1999) Molecular cloning and characterization of MSRV-related sequences associated with retrovirus-like particles. Virology 260:1–9
Blond JL, Beseme F, Duret L et al (1999) Molecular characterization and placental expression of HERV-W, a new human endogenous retrovirus family. J Virol 73:1175–1185
Perron H, Perin JP, Rieger F, Alliel PM (2000) Particle-associated retroviral RNA and tandem RGH/HERV-W copies on human chromosome 7q: possible components of a ‘chain-reaction’ triggered by infectious agents in multiple sclerosis? J Neurovirol 6:S67–S75
Bai J, Zhu RY, Stedman K et al (1996) Unique long terminal repeat U3 sequences distinguish exogenous jaagsiekte sheep retroviruses associated with ovine pulmonary carcinoma from endogenous loci in the sheep genome. J Virol 70:3159–3168
Bartosch B, Stefanidis D, Myers R, Weiss R, Patience C, Takeuchi Y (2004) Evidence and consequence of porcine endogenous retrovirus recombination. J Virol 78:13880–13890
Bramblett D, Liu J, Lozano M et al (1997) Mouse mammary tumor virus: a virus that exploits the immune system. Leukemia 11:183–186
Contag CH, Plagemann PG (1989) Age-dependent poliomyelitis of mice: expression of endogenous retrovirus correlates with cytocidal replication of lactate dehydrogenase-elevating virus in motor neurons. J Virol 63:4362–4369
Xu L, Tay CH, Huber BT, Sarkar NH (2000) Cloning of an infectious milk-borne mouse mammary tumor virus (MMTV) DNA from a mammary tumor that developed in an endogenous MMTV-free wild mouse. Virology 273:325–332
Lower R, Lower J, Kurth R (1996) The viruses in all of us: characteristics and biological significance of human endogenous retrovirus sequences. Proc Natl Acad Sci U S A 93:5177–5184
Patience C, Takeuchi Y, Weiss RA (1997) Infection of human cells by an endogenous retrovirus of pigs. Nat Med 3:282–286
Weiss RA, Griffiths D, Takeuchi Y, Patience C, Venables PJ (1999) Retroviruses: ancient and modern. Arch Virol Suppl 15:171–177
Christensen T, Pedersen L, Sorensen PD, Moller-Larsen A (2002) A transmissible human endogenous retrovirus. AIDS Res Hum Retroviruses 18:861–866
Christensen T, Tonjes RR, Zur Megede J, Boller K, Moller-Larsen A (1999) Reverse transcriptase activity and particle production in B lymphoblastoid cell lines established from lymphocytes of patients with multiple sclerosis. AIDS Res Hum Retroviruses 15:285–291
Dolei A, Perron H (2009) The multiple sclerosis-associated retrovirus and its HERV-W endogenous family: a biological interface between virology, genetics, and immunology in human physiology and disease. J Neurovirol 15(1):4–13
Munch M, Moller-Larsen A, Christensen T, Morling N, Hansen HJ, Haahr S (1995) B-lymphoblastoid cell lines from multiple sclerosis patients and a healthy control producing a putative new human retrovirus and Epstein–Barr virus. Mult Scler 1:78–81
Garson JA, Tuke PW, Giraud P, Paranhos-Baccala G, Perron H (1998) Detection of virion-associated MSRV-RNA in serum of patients with multiple sclerosis. Lancet 351:33
Dolei A, Serra C, Mameli G et al (2002) Multiple sclerosis-associated retrovirus (MSRV) in Sardinian MS patients. Neurology 58:471–473
Serra C, Sotgiu S, Mameli G, Pugliatti M, Rosati G, Dolei A (2001) Multiple sclerosis and multiple sclerosis-associated retrovirus in Sardinia. Neurol Sci 22:171–173
Sotgiu S, Arru G, Soderstrom M, Mameli G, Serra C, Dolei A (2006) Multiple sclerosis-associated retrovirus and optic neuritis. Mult Scler 12:357–359
Sotgiu S, Serra C, Mameli G et al (2002) Multiple sclerosis-associated retrovirus and MS prognosis: an observational study. Neurology 59:1071–1073
Zawada M, Liwien I, Pernak M et al (2003) MSRV pol sequence copy number as a potential marker of multiple sclerosis. Pol J Pharmacol 55:869–875
Mameli G, Astone V, Arru G et al (2007) Brains and peripheral blood mononuclear cells of multiple sclerosis (MS) patients hyperexpress MS-associated retrovirus/HERV-W endogenous retrovirus, but not Human herpesvirus 6. J Gen Virol 88:264–274
Mameli G, Serra C, Astone V et al (2008) Inhibition of multiple sclerosis-associated retrovirus as biomarker of interferon therapy. J Neurovirol 14:73–77
Arru G, Mameli G, Astone V et al (2007) Multiple sclerosis and HERV-W/MSRV: a multicentric study. Int J Biomed Sci 3:292–297
Rolland A, Jouvin-Marche E, Viret C, Faure M, Perron H, Marche PN (2006) The envelope protein of a human endogenous retrovirus-W family activates innate immunity through CD14/TLR4 and promotes Th1-like responses. J Immunol 176:7636–7644
Perron H, Jouvin-Marche E, Michel M et al (2001) Multiple sclerosis retrovirus particles and recombinant envelope trigger an abnormal immune response in vitro, by inducing polyclonal Vbeta16 T-lymphocyte activation. Virology 287:321–332
Antony JM, van Marle G, Opii W et al (2004) Human endogenous retrovirus glycoprotein-mediated induction of redox reactants causes oligodendrocyte death and demyelination. Nat Neurosci 7:1088–1095
Perron H, Lazarini F, Ruprecht K et al (2005) Human endogenous retrovirus (HERV)-W ENV and GAG proteins: physiological expression in human brain and pathophysiological modulation in multiple sclerosis lesions. J Neurovirol 11:23–33
Jolivet-Reynaud C, Perron H, Ferrante P, Becquart L, Dalbon P, Mandrand B (1999) Specificities of multiple sclerosis cerebrospinal fluid and serum antibodies against mimotopes. Clin Immunol 93:283–293
Sotgiu S, Arru G, Mameli G et al (2006) Multiple sclerosis-associated retrovirus in early multiple sclerosis: a six-year follow-up of a Sardinian cohort. Mult Scler 12:698–703
Deb-Rinker P, Klempan TA, O'Reilly RL, Torrey EF, Singh SM (1999) Molecular characterization of a MSRV-like sequence identified by RDA from monozygotic twin pairs discordant for schizophrenia. Genomics 61:133–144
Huang WJ, Liu ZC, Wei W, Wang GH, Wu JG, Zhu F (2006) Human endogenous retroviral pol RNA and protein detected and identified in the blood of individuals with schizophrenia. Schizophr Res 83:193–199
Karlsson H, Bachmann S, Schroder J, McArthur J, Torrey EF, Yolken RH (2001) Retroviral RNA identified in the cerebrospinal fluids and brains of individuals with schizophrenia. Proc Natl Acad Sci U S A 98:4634–4639
Karlsson H, Schroder J, Bachmann S, Bottmer C, Yolken RH (2004) HERV-W-related RNA detected in plasma from individuals with recent-onset schizophrenia or schizoaffective disorder. Mol Psychiatry 9:12–13
Yao Y, Schroder J, Nellaker C et al (2007) Elevated levels of human endogenous retrovirus-W transcripts in blood cells from patients with first episode schizophrenia. Genes Brain Behav 7:103–112
Yolken RH, Karlsson H, Yee F, Johnston-Wilson NL, Torrey EF (2000) Endogenous retroviruses and schizophrenia. Brain Res Brain Res Rev 31:193–199
Perron H, Mekaoui L, Bernard C, Veas F, Stefas I, Leboyer M (2008) Endogenous retrovirus type W GAG and envelope protein antigenemia in serum of schizophrenic patients. Biol Psychiatry 64:1019–1023
Dickerson F, Stallings C, Origoni A, Boronow J, Yolken R (2007) C-reactive protein is associated with the severity of cognitive impairment but not of psychiatric symptoms in individuals with schizophrenia. Schizophr Res 93:261–265
Fan X, Pristach C, Liu EY, Freudenreich O, Henderson DC, Goff DC (2007) Elevated serum levels of C-reactive protein are associated with more severe psychopathology in a subgroup of patients with schizophrenia. Psychiatry Res 149:267–271
Chao CC, Hu S (1994) Tumor necrosis factor-alpha potentiates glutamate neurotoxicity in human fetal brain cell cultures. Dev Neurosci 16:172–179
Chao CC, Hu S, Ehrlich L, Peterson PK (1995) Interleukin-1 and tumor necrosis factor-alpha synergistically mediate neurotoxicity: involvement of nitric oxide and of N-methyl-D-aspartate receptors. Brain Behav Immun 9:355–365
Lavillette D, Marin M, Ruggieri A, Mallet F, Cosset FL, Kabat D (2002) The envelope glycoprotein of human endogenous retrovirus type W uses a divergent family of amino acid transporters/cell surface receptors. J Virol 76:6442–6452
Weis S, Llenos IC, Dulay JR, Verma N, Sabunciyan S, Yolken RH (2007) Changes in region- and cell type-specific expression patterns of neutral amino acid transporter 1 (ASCT-1) in the anterior cingulate cortex and hippocampus in schizophrenia, bipolar disorder and major depression. J Neural Transm 114:261–271
Costas J (2002) Characterization of the intragenomic spread of the human endogenous retrovirus family HERV-W. Mol Biol Evol 19:526–533
Griffiths DJ (2001) Endogenous retroviruses in the human genome sequence. Genome Biol 2:1017
Weiss RA (2000) Ancient and modern retroviruses. Acta Microbiol Immunol Hung 47:403–410
Weiss RA (2006) The discovery of endogenous retroviruses. Retrovirology 3:67
Sverdlov ED (2000) Retroviruses and primate evolution. Bioessays 22:161–171
Voisset C, Blancher A, Perron H, Mandrand B, Mallet F, Paranhos-Baccala G (1999) Phylogeny of a novel family of human endogenous retrovirus sequences, HERV-W, in humans and other primates. AIDS Res Hum Retroviruses 15:1529–1533
Vogel G (2001) The human genome. Objection #2: why sequence the junk? Science 291:1184
Boller K, Konig H, Sauter M et al (1993) Evidence that HERV-K is the endogenous retrovirus sequence that codes for the human teratocarcinoma-derived retrovirus HTDV. Virology 196:349–353
Garson J, Creange A, Dolei A et al (2005) MSRV, Syncytin and the role of endogenous retroviral proteins in demyelination. Mult Scler 11:249–250
Dolei A, Perron H (2008) The multiple sclerosis-associated retrovirus and its HERV-W endogenous family: a biological interface between virology, genetics, and immunology in human physiology and disease. J Neurovirol 15:4–13
Bonnaud B, Bouton O, Oriol G, Cheynet V, Duret L, Mallet F (2004) Evidence of selection on the domesticated ERVWE1 env retroviral element involved in placentation. Mol Biol Evol 21:1895–1901
Mi S, Lee X, Li X et al (2000) Syncytin is a captive retroviral envelope protein involved in human placental morphogenesis [see comments]. Nature 403:785–789
Prudhomme S, Oriol G, Mallet F (2004) A retroviral promoter and a cellular enhancer define a bipartite element which controls env ERVWE1 placental expression. J Virol 78:12157–12168
Gong R, Peng X, Kang S et al (2005) Structural characterization of the fusion core in syncytin, envelope protein of human endogenous retrovirus family W. Biochem Biophys Res Commun 331:1193–1200
Cheynet V, Ruggieri A, Oriol G et al (2005) Synthesis, assembly, and processing of the Env ERVWE1/syncytin human endogenous retroviral envelope. J Virol 79:5585–5593
Schulz WA, Steinhoff C, Florl AR (2006) Methylation of endogenous human retroelements in health and disease. Curr Top Microbiol Immunol 310:211–250
Groudine M, Eisenman R, Weintraub H (1981) Chromatin structure of endogenous retroviral genes and activation by an inhibitor of DNA methylation. Nature 292:311–317
Hoffmann JW, Steffen D, Gusella J et al (1982) DNA methylation affecting the expression of murine leukemia proviruses. J Virol 44:144–157
Matouskova M, Blazkova J, Pajer P, Pavlicek A, Hejnar J (2006) CpG methylation suppresses transcriptional activity of human syncytin-1 in non-placental tissues. Exp Cell Res 312:1011–1020
Christensen T, Petersen T, Thiel S, Brudek T, Ellermann-Eriksen S, Moller-Larsen A (2007) Gene–environment interactions in multiple sclerosis: innate and adaptive immune responses to human endogenous retrovirus and herpesvirus antigens and the lectin complement activation pathway. J Neuroimmunol 183:175–188
Lafon M, Jouvin-Marche E, Marche PN, Perron H (2002) Human viral superantigens: to be or not to be transactivated? Trends Immunol 23:238–239
Lee WJ, Kwun HJ, Kim HS, Jang KL (2003) Activation of the human endogenous retrovirus W long terminal repeat by herpes simplex virus type 1 immediate early protein 1. Mol Cells 15:75–80
Nellaker C, Yao Y, Jones-Brando L, Mallet F, Yolken RH, Karlsson H (2006) Transactivation of elements in the human endogenous retrovirus W family by viral infection. Retrovirology 3:44
Ruprecht K, Obojes K, Wengel V et al (2006) Regulation of human endogenous retrovirus W protein expression by herpes simplex virus type 1: implications for multiple sclerosis. J Neurovirol 12:65–71
Perron H, Suh M, Lalande B et al (1993) Herpes simplex virus ICP0 and ICP4 immediate early proteins strongly enhance expression of a retrovirus harboured by a leptomeningeal cell line from a patient with multiple sclerosis. J Gen Virol 74:65–72
Badal V, Chuang LS, Tan EH et al (2003) CpG methylation of human papillomavirus type 16 DNA in cervical cancer cell lines and in clinical specimens: genomic hypomethylation correlates with carcinogenic progression. J Virol 77:6227–6234
Bhende PM, Seaman WT, Delecluse HJ, Kenney SC (2004) The EBV lytic switch protein, Z, preferentially binds to and activates the methylated viral genome. Nat Genet 36:1099–1104
Bonilla V, Sobrino F, Lucas M, Pintado E (2003) Epstein–Barr virus transformation of human lymphoblastoid cells from patients with fragile X syndrome induces variable changes on CGG repeats size and promoter methylation. Mol Diagn 7:163–167
Ablashi DV, Lapps W, Kaplan M, Whitman JE, Richert JR, Pearson GR (1998) Human Herpesvirus-6 (HHV-6) infection in multiple sclerosis: a preliminary report. Mult Scler 4:490–496
Ascherio A, Munch M (2000) Epstein–Barr virus and multiple sclerosis. Epidemiology 11:220–224
Challoner PB, Smith KT, Parker JD et al (1995) Plaque-associated expression of human herpesvirus 6 in multiple sclerosis. Proc Natl Acad Sci U S A 92:7440–7444
Haahr S, Sommerlund M, Moller-Larsen A, Mogensen S, Andersen HM (1992) Is multiple sclerosis caused by a dual infection with retrovirus and Epstein–Barr virus? Neuroepidemiology 11:299–303
Munch M, Hvas J, Christensen T, Moller-Larsen A, Haahr S (1997) The implications of Epstein–Barr virus in multiple sclerosis—a review. Acta Neurol Scand Suppl 169:59–64
Yao K, Mandel M, Akyani N et al (2006) Differential HHV-6A gene expression in T cells and primary human astrocytes based on multi-virus array analysis. Glia 53:789–798
Serafini B, Rosicarelli B, Franciotta D et al (2007) Dysregulated Epstein–Barr virus infection in the multiple sclerosis brain. J Exp Med 204:2899–2912
Bergstrom T, Andersen O, Vahlne A (1989) Isolation of herpes simplex virus type 1 during first attack of multiple sclerosis. Ann Neurol 26:283–285
Mancuso R, Delbue S, Borghi E et al (2007) Increased prevalence of varicella zoster virus DNA in cerebrospinal fluid from patients with multiple sclerosis. J Med Virol 79:192–199
Marrie RA, Wolfson C (2001) Multiple sclerosis and varicella zoster virus infection: a review. Epidemiol Infect 127:315–325
Sandri-Goldin RM (1994) Properties of an HSV-1 regulatory protein that appears to impair host cell splicing. Infect Agents Dis 3:59–67
Albrecht P, Torrey EF, Boone E, Hicks JT, Daniel N (1980) Raised cytomegalovirus-antibody level in cerebrospinal fluid of schizophrenic patients. Lancet 2:769–772
Dickerson F, Kirkpatrick B, Boronow J, Stallings C, Origoni A, Yolken R (2006) Deficit schizophrenia: association with serum antibodies to cytomegalovirus. Schizophr Bull 32:396–400
Kim JJ, Shirts BH, Dayal M et al (2007) Are exposure to cytomegalovirus and genetic variation on chromosome 6p joint risk factors for schizophrenia? Ann Med 39:145–153
Moises HW, Ruger R, Reynolds GP, Fleckenstein B (1988) Human cytomegalovirus DNA in the temporal cortex of a schizophrenic patient. Eur Arch Psychiatry Neurol Sci 238:110–113
Novotna M, Hanusova J, Klose J et al (2005) Probable neuroimmunological link between Toxoplasma and cytomegalovirus infections and personality changes in the human host. BMC Infect Dis 5:54
Rimon R, Ahokas A, Palo J (1986) Serum and cerebrospinal fluid antibodies to cytomegalovirus in schizophrenia. Acta Psychiatr Scand 73:642–644
Torrey EF, Leweke MF, Schwarz MJ et al (2006) Cytomegalovirus and schizophrenia. CNS Drugs 20:879–885
Conejero-Goldberg C, Torrey EF, Yolken RH (2003) Herpesviruses and Toxoplasma gondii in orbital frontal cortex of psychiatric patients. Schizophr Res 60:65–69
Danesh J, Wong Y, Ward M, Muir J (1999) Risk factors for coronary heart disease and persistent infection with Chlamydia pneumoniae or cytomegalovirus: a population-based study. J Cardiovasc Risk 6:387–390
Ebert T, Kotler M (2005) Prenatal exposure to influenza and the risk of subsequent development of schizophrenia. Isr Med Assoc J 7:35–38
Shi L, Fatemi SH, Sidwell RW, Patterson PH (2003) Maternal influenza infection causes marked behavioral and pharmacological changes in the offspring. J Neurosci 23:297–302
Limosin F, Rouillon F, Payan C, Cohen JM, Strub N (2003) Prenatal exposure to influenza as a risk factor for adult schizophrenia. Acta Psychiatr Scand 107:331–335
Grech A, Takei N, Murray RM (1997) Maternal exposure to influenza and paranoid schizophrenia. Schizophr Res 26:121–125
Torrey EF, Rawlings RR (1996) Fluctuations in schizophrenic births by year. Br J Psychiatry 169:772–775
Crow TJ (1996) Influenza and schizophrenia. Br J Psychiatry 169:790–792
Yolken RH, Torrey EF (1995) Viruses, schizophrenia, and bipolar disorder. Clin Microbiol Rev 8:131–145
Takei N, Murray RM (1994) Prenatal influenza and schizophrenia. Br J Psychiatry 165:833–834
Mednick SA, Machon RA, Huttunen MO, Bonett D (1988) Adult schizophrenia following prenatal exposure to an influenza epidemic. Arch Gen Psychiatry 45:189–192
Nafee TM, Farrell WE, Carroll WD, Fryer AA, Ismail KM (2008) Epigenetic control of fetal gene expression. BJOG 115:158–168
Lees-Murdock DJ, Walsh CP (2008) DNA methylation reprogramming in the germ line. Epigenetics 3:5–13
Fulka H, St John JC, Fulka J, Hozak P (2008) Chromatin in early mammalian embryos: achieving the pluripotent state. Differentiation 76:3–14
Rutter M, Moffitt TE, Caspi A (2006) Gene–environment interplay and psychopathology: multiple varieties but real effects. J Child Psychol Psychiatry 47:226–261
Stefansson H, Rujescu D, Cichon S et al (2008) Large recurrent microdeletions associated with schizophrenia. Nature 455:232–236
Wagenstaller J, Spranger S, Lorenz-Depiereux B et al (2007) Copy-number variations measured by single-nucleotide-polymorphism oligonucleotide arrays in patients with mental retardation. Am J Hum Genet 81:768–779
Menendez L, Benigno BB, McDonald JF (2004) L1 and HERV-W retrotransposons are hypomethylated in human ovarian carcinomas. Mol Cancer 3:12
Ogasawara H, Okada M, Kaneko H, Hishikawa T, Sekigawa I, Hashimoto H (2003) Possible role of DNA hypomethylation in the induction of SLE: relationship to the transcription of human endogenous retroviruses. Clin Exp Rheumatol 21:733–738
Florl AR, Lower R, Schmitz-Drager BJ, Schulz WA (1999) DNA methylation and expression of LINE-1 and HERV-K provirus sequences in urothelial and renal cell carcinomas. Br J Cancer 80:1312–1321
Abrink M, Larsson E, Hellman L (1998) Demethylation of ERV3, an endogenous retrovirus regulating the Kruppel-related zinc finger gene H-plk, in several human cell lines arrested during early monocyte development. DNA Cell Biol 17:27–37
Schwartz SA (1983) Transcriptional activation of endogenous rat retrovirus with and without hypomethylation of proviral DNA. Biochem Biophys Res Commun 112:571–577
Ma JC, Zhou Q, Zhou YH et al (2009) The size and ratio of homologous sequence to non-homologous sequence in gene disruption cassette influences the gene targeting efficiency in Beauveria bassiana. Appl Microbiol Biotechnol 82:891–898
Bilodeau M, Girard S, Hebert J, Sauvageau G (2007) A retroviral strategy that efficiently creates chromosomal deletions in mammalian cells. Nat Methods 4:263–268
Choi J, Koh E, Matsui F et al (2008) Study of azoospermia factor-a deletion caused by homologous recombination between the human endogenous retroviral elements and population-specific alleles in Japanese infertile males. Fertil Steril 89:1177–1182
Joyner AL, Bernstein A (1983) Retrovirus transduction: generation of infectious retroviruses expressing dominant and selectable genes is associated with in vivo recombination and deletion events. Mol Cell Biol 3:2180–2190
Lazo PA, Tsichlis PN (1988) Recombination between two integrated proviruses, one of which was inserted near c-myc in a retrovirus-induced rat thymoma: implications for tumor progression. J Virol 62:788–794
Otto E, Jones-Trower A, Vanin EF et al (1994) Characterization of a replication-competent retrovirus resulting from recombination of packaging and vector sequences. Hum Gene Ther 5:567–575
Stuhlmann H, Berg P (1992) Homologous recombination of copackaged retrovirus RNAs during reverse transcription. J Virol 66:2378–2388
Zhang J, Temin HM (1994) Retrovirus recombination depends on the length of sequence identity and is not error prone. J Virol 68:2409–2414
Mirsattari SM, Johnston JB, McKenna R et al (2001) Aboriginals with multiple sclerosis: HLA types and predominance of neuromyelitis optica. Neurology 56:317–323
Cook EH Jr, Scherer SW (2008) Copy-number variations associated with neuropsychiatric conditions. Nature 455:919–923
Consortium TIS (2008) Rare chromosomal deletions and duplications increase risk of schizophrenia. Nature 455:237–241
Perron H, Mekaoui L, Bernard C, Veas F, Stefas I, Leboyer M (2008) Endogenous retrovirus type W GAG and envelope protein antigenemia in serum of schizophrenic patients. Biol Psychiatry 64:1019–1023
Contag CH, Chan SP, Wietgrefe SW, Plagemann PG (1986) Correlation between presence of lactate dehydrogenase-elevating virus RNA and antigens in motor neurons and paralysis in infected C58 mice. Virus Res 6:195–209
Contag CH, Harty JT, Plagemann PG (1989) Dual virus etiology of age-dependent poliomyelitis of mice. A potential model for human motor neuron diseases. Microb Pathog 6:391–401
Contag CH, Plagemann PG (1988) Susceptibility of C58 mice to paralytic disease induced by lactate dehydrogenase-elevating virus correlates with increased expression of endogenous retrovirus in motor neurons. Microb Pathog 5:287–296
Rolland A, Jouvin-Marche E, Saresella M et al (2005) Correlation between disease severity and in vitro cytokine production mediated by MSRV (multiple sclerosis associated retroviral element) envelope protein in patients with multiple sclerosis. J Neuroimmunol 160:195–203
Saresella M, Marventano I, Speciale L et al (2005) Programmed cell death of myelin basic protein-specific T lymphocytes is reduced in patients with acute multiple sclerosis. J Neuroimmunol 166:173–179
Arnheim N, Calabrese P (2009) Understanding what determines the frequency and pattern of human germline mutations. Nat Rev Genet 10:478–488
Barros SP, Offenbacher S (2009) Epigenetics: connecting environment and genotype to phenotype and disease. J Dent Res 88:400–408
Figueiredo LM, Cross GA, Janzen CJ (2009) Epigenetic regulation in African trypanosomes: a new kid on the block. Nat Rev Microbiol 7:504–513
Hewagama A, Richardson B (2009) The genetics and epigenetics of autoimmune diseases. J Autoimmun 33:3–11
Invernizzi P (2009) Future directions in genetic for autoimmune diseases. J Autoimmun 33:1–2
Invernizzi P, Pasini S, Selmi C, Gershwin ME, Podda M (2009) Female predominance and X chromosome defects in autoimmune diseases. J Autoimmun 33:12–16
Larizza D, Calcaterra V, Martinetti M (2009) Autoimmune stigmata in Turner syndrome: when lacks an X chromosome. J Autoimmun 33:25–30
Persani L, Rossetti R, Cacciatore C, Bonomi M (2009) Primary ovarian insufficiency: X chromosome defects and autoimmunity. J Autoimmun 33:35–41
Sawalha AH, Harley JB, Scofield RH (2009) Autoimmunity and Klinefelter's syndrome: when men have two X chromosomes. J Autoimmun 33:31–34
Wells AD (2009) New insights into the molecular basis of T cell anergy: anergy factors, avoidance sensors, and epigenetic imprinting. J Immunol 182:7331–7341
Zernicka-Goetz M, Morris SA, Bruce AW (2009) Making a firm decision: multifaceted regulation of cell fate in the early mouse embryo. Nat Rev Genet 10:467–477
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Perron, H., Lang, A. The Human Endogenous Retrovirus Link between Genes and Environment in Multiple Sclerosis and in Multifactorial Diseases Associating Neuroinflammation. Clinic Rev Allerg Immunol 39, 51–61 (2010). https://doi.org/10.1007/s12016-009-8170-x
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12016-009-8170-x
Keywords
- HERV-W
- MSRV
- Retrotransposable elements
- Multiple sclerosis
- Inflammation
- TLR-4
- Chromosome X
- Herpesvirus
- Epstein–Barr virus
- Cytomegalovirus
- Influenza virus
- Gene–environment
- Junk DNA
- Neuroinflammation
- Neurotoxicity
- Demyelination
- Epigenetics
- Methylation
- Transactivation