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Veterinary ophthalmology2022; 26(2); 86-100; doi: 10.1111/vop.13002

A review of investigated risk factors for developing equine recurrent uveitis.

Abstract: Equine recurrent uveitis (ERU) is an ocular inflammatory disease that can be difficult to manage clinically. As such, it is the leading cause of bilateral blindness for horses. ERU is suspected to have a complex autoimmune etiology with both environmental and genetic risk factors contributing to onset and disease progression in some or all cases. Work in recent years has aimed at unraveling the primary triggers, such as infectious agents and inherited breed-specific risk factors, for disease onset, persistence, and progression. This review has aimed at encompassing those factors that have been associated, implicated, or substantiated as contributors to ERU, as well as identifying areas for which additional knowledge is needed to better understand risk for disease onset and progression. A greater understanding of the risk factors for ERU will enable earlier detection and better prognosis through prevention and new therapeutics.
Publication Date: 2022-06-12 PubMed ID: 35691017DOI: 10.1111/vop.13002Google Scholar: Lookup
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  • Journal Article
  • Review

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research paper provides a comprehensive review of the risk factors associated with equine recurrent uveitis (ERU), a leading cause of blindness in horses, and identifies areas where more knowledge is needed for better prognosis through prevention and treatment.

About Equine Recurrent Uveitis

  • Equine recurrent uveitis (ERU) is an inflammatory disease of the eye, which is difficult to manage clinically due to its repetitive nature.
  • It is the primary cause of bilateral blindness in horses, meaning it affects both eyes, leading to complete loss of vision.
  • The disease is thought to have a complex autoimmune etiology – the onset and progression of the disease is influenced by a combination of genetic and environmental risk factors.

Understanding the Risk Factors

  • The article reviews the various factors that have been associated with ERU. This includes primary triggers such as infectious agents and inherited breed-specific risk factors.
  • Understanding these risk factors can help in early detection of the disease and also in designing prevention strategies and therapeutics.
  • The study also points out that the understanding of these risk factors is not complete and further research is necessary.

Significance of the Study

  • This review of risk factors is crucial because it compiles and analyses existing data on ERU. This can serve as a useful resource for future research in this field.
  • The study identifies gaps in our understanding of ERU, suggesting areas that need further investigation. This could potentially lead to breakthroughs in prevention and treatment methods.
  • A better understanding of the risk factors associated with ERU can help develop better strategies for early diagnosis, treatment, and management of the disease, thus improving the overall prognosis for affected horses.

Cite This Article

APA
Kingsley NB, Sandmeyer L, Bellone RR. (2022). A review of investigated risk factors for developing equine recurrent uveitis. Vet Ophthalmol, 26(2), 86-100. https://doi.org/10.1111/vop.13002

Publication

ISSN: 1463-5224
NlmUniqueID: 100887377
Country: England
Language: English
Volume: 26
Issue: 2
Pages: 86-100

Researcher Affiliations

Kingsley, Nicole B
  • Veterinary Genetics Laboratory, School of Veterinary Medicine, University of California - Davis, Davis, California, USA.
  • Department of Population Health and Reproduction, School of Veterinary Medicine, University of California - Davis, Davis, California, USA.
Sandmeyer, Lynne
  • Department of Small Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
Bellone, Rebecca R
  • Veterinary Genetics Laboratory, School of Veterinary Medicine, University of California - Davis, Davis, California, USA.
  • Department of Population Health and Reproduction, School of Veterinary Medicine, University of California - Davis, Davis, California, USA.

MeSH Terms

  • Horses
  • Animals
  • Horse Diseases / etiology
  • Uveitis / veterinary
  • Eye
  • Prognosis
  • Risk Factors

Grant Funding

  • D16EQ-028 / Morris Animal Foundation
  • Townsend Equine Health Research Fund
  • 18-17 / University of California Davis, Center for Equine Health

References

This article includes 152 references
  1. Gilger BC, Hollingsworth SR. Diseases of the uvea, uveitis, and recurrent uveitis. In: Gilger BC, ed. Equine Ophthalmology. 3rd ed. John Wiley & Sons, Ltd; 2017:376-422.
  2. Baumgart A, Gerhards H. Besonderheiten der Tigerschecken-Uveitis und möglicher cyclosporin A-Einsatz in deren Therapie in Deutschland. Pferdeheilkunde 2014;30(6):626-632.
  3. Wollanke B, Gerhards H, Ackermann K. Infectious uveitis in horses and new insights in its leptospiral. Microorganisms 2022;10(2):387.
  4. Malalana F. What's new in equine recurrent uveitis?. In Pract 2020;42(6):348-354.
    doi: 10.1136/inp.m2464google scholar: lookup
  5. Gerding JC, Gilger BC. Prognosis and impact of equine recurrent uveitis. Equine Vet J 2016;48(3):290-298.
    doi: 10.1111/evj.12451google scholar: lookup
  6. Pinto NI, Mcmullen RJ, Linder KE, Cullen JM, Gilger BC. Clinical, histopathological and immunohistochemical characterization of a novel equine ocular disorder: Heterochromic iridocyclitis with secondary keratitis in adult horses. Vet Ophthalmol 2015;18(6):443-456.
    doi: 10.1111/vop.12234google scholar: lookup
  7. Sandmeyer LS, Bauer BS, Feng CX, Grahn BH. Equine recurrent uveitis in western Canadian prairie provinces: a retrospective study (2002-2015). Can Vet J 2017;58:717-722.
  8. Schwink KL. Equine uveitis. Vet Clin North Am Equine Pract 1992;8(3):557-574.
  9. McMullen RJ, Fischer BM. Medical and surgical management of equine recurrent uveitis. Vet Clin North Am Equine Pract 2017;33(3):465-481.
  10. Zaidi AA, Ying GS, Daniel E. Systemic immunosuppressive therapy for eye diseases cohort study. Hypopyon in Patients with Uveitis. Ophthalmology 2010;117(2):366-372.
  11. Gilger BC, Michau TM. Equine recurrent uveitis: new methods of management. Vet Clin North Am Equine Pract 2004;20(2):417-427.
  12. Fritz KL, Kaese HJ, Valberg SJ. Genetic risk factors for insidious equine recurrent uveitis in Appaloosa horses. Anim Genet 2014;45(3):392-399.
    doi: 10.1111/age.12129google scholar: lookup
  13. Gilger BC, Deeg CA. Equine recurrent uveitis. In: Gilger BC, ed. Equine Ophthalmology. 2nd ed. Elsevier Saunders; 2011:317-349.
  14. Gilger BC, Malok E, Cutter KV, Stewart T, Horohov DW, Allen JB. Characterization of T-lymphocytes in the anterior uvea of eyes with chronic equine recurrent uveitis. Vet Immunol Immunopathol 1999;71(1):17-28.
  15. Romeike A, Brugmann M, Drommer W. Immunohistochemical studies in equine recurrent uveitis (ERU). Vet Pathol 1998;35:515-526.
  16. Malalana F, Stylianides A, McGowan C. Equine recurrent uveitis: human and equine perspectives. Vet J 2015;206(1):22-29.
  17. Saldinger LK, Nelson SG, Bellone RR. Horses with equine recurrent uveitis have an activated CD4+ T-cell phenotype that can be modulated by mesenchymal stem cells in vitro. Vet Ophthalmol 2020;23(1):160-170.
    doi: 10.1111/vop.12704google scholar: lookup
  18. Caspi RR. A look at autoimmunity and inflammation in the eye. J Clin Invest 2010;120(9):3073-3083.
    doi: 10.1172/jci42440google scholar: lookup
  19. Guedes MCE, Borrego LM, Proença RD. Roles of interleukin-17 in uveitis. Indian J Ophthalmol 2016;64(9):628-634.
    doi: 10.4103/0301-4738.194339google scholar: lookup
  20. Deeg CA, Hauck SM, Amann B. Equine recurrent uveitis - a spontaneous horse model of uveitis. Ophthalmic Res 2008;40(3-4):151-153.
    doi: 10.1159/000119867google scholar: lookup
  21. Witkowski L, Cywinska A, Paschalis-Trela K, Crisman M, Kita J. Multiple etiologies of equine recurrent uveitis - a natural model for human autoimmune uveitis: a brief review. Comp Immunol Microbiol Infect Dis 2016;44:14-20.
  22. Wildner G, Thurau SR. Cross-reactivity between an HLA-B27-derived peptide and a retinal autoantigen peptide: a clue to major histocompatibility complex association with autoimmune disease. Eur J Immunol 1994;24(11):2579-2585.
    doi: 10.1002/eji.1830241103google scholar: lookup
  23. Deeg CA, Thurau SR, Gerhards H, Ehrenhofer M, Wildner G, Kaspers B. Uveitis in horses induced by interphotoreceptor retinoid-binding protein is similar to the spontaneous disease. Eur J Immunol 2002;32(9):2598-2606.
  24. Deeg CA, Amann B, Raith AJ, Kaspers B. Inter- and intramolecular epitope spreading in equine recurrent uveitis. Investig Ophthalmol Vis Sci 2006;47(2):652-656.
    doi: 10.1167/iovs.05-0789google scholar: lookup
  25. Deeg CA, Reese S, Gerhards H, Wildner G, Kaspers B. The uveitogenic potential of retinal S-antigen in horses. Investig Ophthalmol Vis Sci 2004;45(7):2286-2292.
    doi: 10.1167/iovs.03-1226google scholar: lookup
  26. Deeg CA, Hauck SM, Amann B, Kremmer E, Stangassinger M, Ueffing M. Major retinal autoantigens remain stably expressed during all stages of spontaneous uveitis. Mol Immunol 2007;44(13):3291-3296.
  27. Deeg CA. A proteomic approach for studying the pathogenesis of spontaneous equine recurrent uveitis (ERU). Vet Immunol Immunopathol 2009;128(1-3):132-136.
  28. Deeg CA, Ehrenhofer M, Thurau SR, Reese S, Wildner G, Kaspers B. Immunopathology of recurrent uveitis in spontaneously diseased horses. Exp Eye Res 2002;75(2):127-133.
    doi: 10.1006/exer.2002.2011google scholar: lookup
  29. Dwyer AE, Crockett RS, Kalsow CM. Association of leptospiral seroreactivity and breed with uveitis and blindness in horses: 372 cases (1986-1993). J Am Vet Med Assoc 1995;207(10):1327-1331.
  30. Pearce JW, Galle LE, Kleiboeker SB. Detection of Leptospira interrogans DNA and antigen in fixed equine eyes affected with end-stage equine recurrent uveitis. J Vet Diagn Invest 2007;19(6):686-690.
  31. Matthews AG, Palmer MF. Serological study of leptospiral infections and endogenous uveitis among horses and ponies in the United Kingdom. Equine Vet J 1987;19(2):125-128.
  32. Hanno HA, Cleveland AF. Leptospiral uveitis. Am J Ophthalmol 1949;32(11):1564-1566.
  33. Davidson MG, Nasiss MP, Roberts SM. Immunodiagnosis of leptospiral uveitis in two horses. Equine Vet J 1987;19(2):155-157.
  34. Rathinam SR, Rathnam S, Selvaraj S, Dean D, Nozik RA, Namperumalsamy P. Uveitis associated with an epidemic outbreak of Leptospirosis. Am J Ophthalmol 1997;124(1):71-79.
  35. Straub MH, Church M, Glueckert E, Foley JE. Raccoons (Procyon lotor) and striped skunks (Mephitis mephitis) as potential reservoirs of leptospira spp in California. Vector-Borne Zoonotic Dis 2020;20(6):418-426.
    doi: 10.1089/vbz.2019.2528google scholar: lookup
  36. Gallagher A. Leptospirosis in a dog with uveitis and presumed cholecystitis. J Am Anim Hosp Assoc 2011;47(6):162-167.
    doi: 10.5326/jaaha-ms-5590google scholar: lookup
  37. Chu KM, Rathinam R, Namperumalsamy P, Dean D. Identification of Leptospira species in the pathogenesis of uveitis and determination of clinical ocular characteristics in South India. J Infect Dis 1998;177(5):1314-1321.
    doi: 10.1086/515273google scholar: lookup
  38. Townsend WM. Canine and feline uveitis. Vet Clin North Am Small Anim Pract 2008;38(2):323-346.
  39. Townsend WM, Stiles J, Krohne SG. Leptospirosis and panuveitis in a dog. Vet Ophthalmol 2006;9(3):169-173.
  40. Wotman KL, Johnson AL. Ocular manifestations of systemic disease in the horse. Vet Clin North Am Equine Pract 2017;33(3):563-582.
  41. Reuss SM, Chaffin MK, Cohen ND. Extrapulmonary disorders associated with Rhodococcus equi infection in foals: 150 cases (1987-2007). J Am Vet Med Assoc 2009;235(7):855-863.
  42. Huber L, Giguère S, Berghaus LJ, Hanafi A, Vitosh-Sillman S, Czerwinski SL. Development of septic polysynovitis and uveitis in foals experimentally infected with Rhodococcus equi. PLoS One 2018;13(2):1-11.
  43. Priest HL, Irby NL, Schlafer DH. Diagnosis of Borrelia-associated uveitis in two hors. Vet Ophthalmol 2012;15:398-405.
  44. Divers TJ, Gardner RB, Madigan JE. Borrelia burgdorferi infection and lyme disease in North American horses: a consensus statement. J Vet Intern Med 2018;32(2):617-632.
    doi: 10.1111/jvim.15042google scholar: lookup
  45. Burgess E, Gillette D, Pickett J. Arthritis and panuveitis as manifestations of Borrelia burgdorferi infection in a Wisconsin pony. J Am Vet Med Assoc 1986;189:1340-1342.
  46. Kinde H, Mathews M, Ash L, St LJ. Halicephalobus gingivalis (H. deletrix) infection in two horses in southern California. J Vet Diagn Invest 2000;12(2):162-165.
  47. Divers TJ, Chang Y-F, Irby NL, Smith JL, Carter CN. Leptospirosis: an important infectious disease in North American horses. Equine Vet J 2019;51(3):287-292.
    doi: 10.1111/evj.13069google scholar: lookup
  48. Marquez A, Djelouadji Z, Lattard V, Kodjo A. Overview of laboratory methods to diagnose leptospirosis and to identify and to type leptospires. Int Microbiol 2017;20(4):184-193.
    doi: 10.2436/20.1501.01.302google scholar: lookup
  49. Geiger T, Gerhards H, Wollanke B. Detection of anti-lipl32 antibodies in serum samples from horses with chronic intraocular infection with leptospira spp. Pathogens 2021;10(10):1325.
    doi: 10.3390/pathogens10101325google scholar: lookup
  50. Ye C, Yan W, McDonough PL. Serodiagnosis of equine leptospirosis by enzyme-linked immunosorbent assay using four recombinant protein markers. Clin Vaccine Immunol 2014;21(4):478-483.
    doi: 10.1128/cvi.00649-13google scholar: lookup
  51. Miller MD, Annis KM, Lappin MR, Lunn KF. Variability in results of the microscopic agglutination test in dogs with clinical leptospirosis and dogs vaccinated against Leptospirosis. J Vet Intern Med 2011;25(3):426-432.
  52. Halliwell RE, Brim TA, Mines MT, Wolf D, White FH. Studies on equine recurrent uveitis. II: the role of infection with leptospira interrogans serovar Pomona. Curr Eye Res 1985;4(10):1033-1040.
    doi: 10.3109/02713688509003348google scholar: lookup
  53. Wollanke B, Gerhards H, Brem S, Meyer P, Kopp H. Ätiologie der equinen rezidivierenden uveitis (ERU): autoimmunkrankheit oder intraokulare leptospireninfektion?. Pferdeheilkunde 2004;20(4):327-340.
    doi: 10.21836/pem20040403google scholar: lookup
  54. Gilger BC. Association of acute leptospirosis with systemic disease and uveitis in horses. Equine Vet Educ 2018;30(3):137-138.
    doi: 10.1111/eve.12693google scholar: lookup
  55. De Groot-Mijnes JDF, Rothova A, Van Loon AM. Polymerase chain reaction and goldmann-witmer coefficient analysis are complimentary for the diagnosis of infectious uveitis. Am J Ophthalmol 2006;141(2):313-318.
    doi: 10.1016/j.ajo.2005.09.017google scholar: lookup
  56. Sauvage AC, Monclin SJ, Elansary M, Hansen P, Grauwels MF. Detection of intraocular Leptospira spp. by real-time polymerase chain reaction in horses with recurrent uveitis in Belgium. Equine Vet J 2019;51(3):299-303.
    doi: 10.1111/evj.13012google scholar: lookup
  57. Williams RD, Morter RL, Freeman MJ, Lavignette AM. Experimental chronic uveitis. Ophthalmic signs following equine leptospirosis. Invest Ophthalmol 1971;10(12):948-954.
  58. Verma A, Stevenson B. Leptospiral uveitis - There is more to it than meets the eye!. Zoonoses Public Health 2012;59((Suppl.2):132-141.
  59. Rathinam SR. Ocular manifestations of leptospirosis. J Postgrad Med 2005;51(3):189-194.
  60. Verma A, Stevenson B, Adler B. Leptospirosis in horses. Vet Microbiol 2013;167(1-2):61-66.
  61. Voelter K, Vial Z, Pot SA, Spiess BM. Leptospiral antibody prevalence and surgical treatment outcome in horses with Equine Recurrent Uveitis (ERU) in Switzerland. Vet Ophthalmol 2020;23(4):648-658.
    doi: 10.1111/vop.12767google scholar: lookup
  62. Verma A, Kumar P, Babb K, Timoney JF, Stevenson B. Cross-reactivity of antibodies against leptospiral recurrent uveitis-associated proteins A and B (LruA and LruB) with eye proteins. PLoS Negl Trop Dis 2010;4(8):1-9.
  63. Deeg CA, Pompetzki D, Raith AJ. Identification and functional validation of novel autoantigens in equine uveitis. Mol Cell Proteomics 2006;5(8):1462-1470.
  64. Deeg CA, Kaspers B, Gerhards H, Thurau SR, Wollanke B, Wildner G. Immune responses to retinal autoantigens and peptides in equine recurrent uveitis. Invest Ophthalmol Vis Sci 2001;42(2):393-398.
  65. Ristow P, Bourhy P, Kerneis S. Biofilm formation by saprophytic and pathogenic leptospires. Microbiology 2008;154(5):1309-1317.
  66. Ackermann K, Kenngott R, Settles M, Gerhards H, Maierl J, Wollanke B. In vivo biofilm formation of pathogenic leptospira spp. In the vitreous humor of horses with recurrent uveitis. Microorganisms 2021;9(9):1-14.
  67. Malalana F, Blundell RJ, Pinchbeck GL, Mcgowan CM. The role of Leptospira spp. in horses affected with recurrent uveitis in the UK. Equine Vet J 2017;49(6):706-709.
    doi: 10.1111/evj.12683google scholar: lookup
  68. Gilger BC, Salmon JH, Yi NY. Role of bacteria in the pathogenesis of recurrent uveitis in horses from the southeastern United States. Am J Vet Res 2008;69(10):1329-1335.
    doi: 10.2460/ajvr.69.10.1329google scholar: lookup
  69. Sandmeyer LS, Kingsley NB, Walder C. Risk factors for equine recurrent uveitis in a population of Appaloosa horses in western Canada. Vet Ophthalmol 2020;23(3):515-525.
    doi: 10.1111/vop.12749google scholar: lookup
  70. Frellstedt L. Equine recurrent uveitis: a clinical manifestation of leptospirosis. Equine Vet Educ 2009;21(10):546-552.
    doi: 10.2746/095777309x467853google scholar: lookup
  71. Tarancón I, Leiva M, Jose-Cunilleras E, Ríos J, Peña T. Ophthalmologic findings associated with Rhodococcus equi bronchopneumonia in foals. Vet Ophthalmol 2019;22(5):660-665.
    doi: 10.1111/vop.12637google scholar: lookup
  72. Sommerauer S, Blohm KO, Spergser J, Buchner HHF. Arthritis, panuveitis and hyperaesthesia associated with Borrelia afzelii infection in a warmblood gelding. Vet Rec Case Rep 2019;7:e000911.
  73. Gerhards H, Wollanke B. Antibody titers against Borrelia in horses in serum and in eyes and occurrence of equine recurrent uveitis. Berl Munch Tierarztl Wochenschr 1996;109(8):273-278.
  74. Breeveld J, Kuiper H, Spanjaard L, Luyendijk L, Rothova A. Uveitis and Lyme borreliosis. Br J Ophthalmol 1993;77(8):480-481.
    doi: 10.1136/bjo.77.8.480google scholar: lookup
  75. Mikkilä H, Seppälä I, Leirisalo-Repo M, Immonen I, Karma A. The etiology of uveitis: the role of infections with special reference to Lyme borreliosis. Acta Ophthalmol Scand 1997;75(6):716-719.
  76. Neely M, Arroyo LG, Jardine C. Seroprevalence and evaluation of risk factors associated with seropositivity for Borrelia burgdorferi in Ontario horses. Equine Vet J 2020;53:331-338.
  77. Chang YF, Novosol V, Mcdonough SP. Experimental infection of ponies with Borrelia burgdorferi by exposure to ixodid ticks. Vet Pathol 2000;37(1):68-76.
    doi: 10.1354/vp.37-1-68google scholar: lookup
  78. Cambra-Pellejà M, Gandasegui J, Balaña-Fouce R, Muñoz J, Martínez-Valladares M. Zoonotic implications of onchocerca species on human health. Pathogens 2020;9(9):1-17.
    doi: 10.3390/pathogens9090761google scholar: lookup
  79. Attenburrow DP, Donnelly JJ, Soulsby EJL. Periodic ophthalmia (recurrent uveitis) of horses: an evaluation of the aetiological role of microfilariae of Onchocerca cervicalis and the clinical management of the condition. Equine Vet J 2010;15(S2):48-56.
  80. Boswinkel M, Neyens IJS, van Oldruitenborgh-Oosterbaan MM. Halicephalobus gingivalis infection in a 5-year-old Tinker gelding. Tijdschr Diergeneeskd 2006;131(3):74-80.
  81. Yu F, Liu B, Chen S. First molecular confirmation of equine ocular setaria digitata in China. Vet Sci 2021;8(4):4-9.
    doi: 10.3390/vetsci8040055google scholar: lookup
  82. Shin J, Ahn KS, Suh GH. First blindness cases of horses infected with Setaria Digitata (Nematoda: Filarioidea) in the republic of Korea. Korean J Parasitol 2017;55(6):667-671.
    doi: 10.3347/kjp.2017.55.6.667google scholar: lookup
  83. Rafee MA, Amarpal A. Equine ocular setariasis and its management. J Exp Biol Agric Sci 2016;4(Spl-4-EHIDZ):S139-S143.
  84. Aroch I, Ofri R, Sutton GA. Ocular manifestations of systemic diseases. Slatter's Fundamentals of Veterinary Ophthalmology Elsevier, Inc.; 2008:374-418.
  85. Davis JL. Ocular Manifestations of Systemic Disease. 2nd ed. Elsevier Inc.; 2016.
  86. Muhammad G, Saqib M. Successful treatment of ocular equine microfilariasis (Setaria species) with ivermectin. Vet Rec 2007;160(1):25-26.
    doi: 10.1136/vr.160.1.25google scholar: lookup
  87. Gilger BC. Recurrent uveitis. In: Felippe M, ed. Equine Clinical Immunology. John Wiley & Sons, Ltd; 2016:121-126.
  88. Sandmeyer LS, Bowen G, Grahn BH. Diagnostic ophthalmology. Can Vet J 2007;48(9):975-976.
  89. Glaser AL, de Vries AAF, Rottier PJM, Horzinek MC, Colenbrander B. Equine arteritis virus: a review of clinical features and management aspects. Vet Q 1996;18(3):95-99.
  90. Balasuriya UBR, Go YY, MacLachlan NJ. Equine arteritis virus. Vet Microbiol 2013;167(1-2):93-122.
  91. Timoney PJ. Equine influenza. Comp Immunol Microbiol Infect Dis 1996;19(3):205-211.
  92. van Maanen C, Cullinane A. Equine influenza virus infections: an update. Vet Q 2002;24(2):79-94.
  93. Landolt GA. Equine influenza virus. Vet Clin North Am Equine Pract 2014;30(3):507-522.
  94. Wilson WD. Equine herpesvirus 1 myeloencephalopathy. Vet Clin North Am Equine Pract 1997;13(1):53-72.
  95. Whitwell KE, Bluden AS. Pathological findings in horses dying during an outbreak of the paralytic form of Equid herpesvirus type 1 (EHV-1) infection. Equine Vet J 1992;24:13-19.
  96. McCartan C, Russell M, Wood J, Mumford J. Clinical, serological and virological characteristics of an outbreak of paresis and neonatal foal disease due to equine herpesvirus-1 on a stud farm. Vet Rec 1995;136(1):7-12.
    doi: 10.1136/vr.136.1.7google scholar: lookup
  97. Hussey GS, Goehring LS, Lunn DP. Experimental infection with equine herpesvirus type 1 (EHV-1) induces chorioretinal lesions. Vet Res 2013;44(1):1-15.
    doi: 10.1186/1297-9716-44-118google scholar: lookup
  98. Holz CL, Sledge DG, Kiupel M, Nelli RK, Goehring LS, Hussey GS. Histopathologic findings following experimental equine herpesvirus 1 infection of horses. Front Vet Sci 2019;6:1-10.
    doi: 10.3389/fvets.2019.00059google scholar: lookup
  99. Szemes P, Gerhards H. Untersuchungen zur Prävalenz der equinen rezidivierenden Uveitis im Großraum Köln-Bonn. Prakt Tierarzt 2000;81:408-420.
  100. Rockwell H, Mack M, Famula T. Genetic investigation of equine recurrent uveitis in Appaloosa horses. Anim Genet 2020;51(1):111-116.
    doi: 10.1111/age.12883google scholar: lookup
  101. Malalana F, Ireland JL, Pinchbeck GL, McGowan CM. Risk factors for a first episode of primary uveitis in the UK and proportion of cases that experience recurrence following this first episode. Equine Vet J 2022;1-6.
    doi: 10.1111/evj.13576google scholar: lookup
  102. Guo X, Chen Z, Xing Y. Immune-mediated uveitis and lifestyle factors: a review. Ophthalmic Res 2021;64(5):687-695.
    doi: 10.1159/000518496google scholar: lookup
  103. Fu X, Chen Y, Chen D. The role of gut microbiome in autoimmune uveitis. Ophthalmic Res 2021;64(2):168-177.
    doi: 10.1159/000510212google scholar: lookup
  104. Muhammad FY, Peters K, Wang D, Lee DJ. Exacerbation of autoimmune uveitis by obesity occurs through the melanocortin 5 receptor. J Leukoc Biol 2019;106(4):879-887.
    doi: 10.1002/jlb.ma0119-030rrgoogle scholar: lookup
  105. de Bustamante MM, Gomez D, Macnicol J, Hamor R, Plummer C. The fecal bacterial microbiota in horses with equine recurrent uveitis. Animals 2021;11(3):1-16.
    doi: 10.3390/ani11030745google scholar: lookup
  106. Rohrbach BW, Ward DA, Hendrix DVH, Cawrse-Foss M, Moyers TD. Effect of vaccination against leptospirosis on the frequency, days to recurrence and progression of disease in horses with equine recurrent uveitis. Vet Ophthalmol 2005;8(3):171-179.
  107. Hack Y, Henriksen ML, Pihl TH, Nielsen RK, Dwyer AE, Bellone RR. A genetic investigation of equine recurrent uveitis in the Icelandic horse breed. Anim Genet 2022;53:1-5.
    doi: 10.1111/age.13200google scholar: lookup
  108. Kulbrock M, Von Borstel M, Rohn K, Distl O, Ohnesorge B. Studie zu Häufigkeit und Schweregrad der Equinen Rezidivierenden Uveitis bei Warmblütern. Pferdeheilkunde 2013;29(1):27-36.
    doi: 10.21836/pem20130105google scholar: lookup
  109. Henriksen ML, Dwyer AE, Kraru Pnielsen R, Bäcklund S, Dahlmann Christensen N, Holbergpihl T. Ocular abnormalities in the Icelandic horse with a focus on equine recurrent uveitis: 112 Icelandic horses living in Denmark and 26 Icelandic horses living in the United States. Vet Ophthalmol 2021;25:194-208.
    doi: 10.1111/vop.12961google scholar: lookup
  110. Deeg CA, Marti E, Gaillard C, Kaspers B. Equine recurrent uveitis is strongly associated with the MHC class I haplotype ELA-A9. Equine Vet J 2004;36(1):73-75.
    doi: 10.2746/0425164044864651google scholar: lookup
  111. Lazary S, Antczak DF, Bailey E. Joint Report of the Fifth International Workshop on Lymphocyte Alloantigens of the Horse, Baton Rouge, Louisiana, 31 October-1 November 1987. Anim Genet 1988;19(4):447-456.
  112. Tseng CT, Miller D, Cassano J, Bailey E, Antczak DF. Identification of equine major histocompatibility complex haplotypes using polymorphic microsatellites. Anim Genet 2010;41(Suppl. 2):150-153.
  113. Tallmadge RL, Campbell JA, Miller DC, Antczak DF. Analysis of MHC class I genes across horse MHC haplotypes. Immunogenetics 2010;62(3):159-172.
    doi: 10.1007/s00251-009-0420-9google scholar: lookup
  114. Tallmadge RL, Lear TL, Antczak DF. Genomic characterization of MHC class I genes of the horse. Immunogenetics 2005;57(10):763-774.
    doi: 10.1007/s00251-005-0034-9google scholar: lookup
  115. Kulbrock M, Lehner S, Metzger J, Ohnesorge B, Distl O. A genome-wide association study identifies risk loci to equine recurrent uveitis in German Warmblood horses. PLoS One 2013;8(8):1-6.
  116. Miller D, Tallmadge RL, Binns M. Polymorphism at expressed DQ and DR loci in five common equine MHC haplotypes. Immunogenetics 2017;69(3):145-156.
    doi: 10.1007/s00251-016-0964-4google scholar: lookup
  117. Wade CM, Giulotto E, Sigurdsson S. Genome sequence, comparative analysis, and population genetics of the domestic horse. Science 2009;326(5954):865-867.
    doi: 10.1126/science.1178158google scholar: lookup
  118. Deeg CA. Ocular immunology in equine recurrent uveitis. Vet Ophthalmol 2008;11(Suppl.1):61-65.
  119. Sponenberg DP, Carr G, Simak E, Schwink K. The inheritance of the leopard complex of spotting patterns in horses. J Hered 1990;81(4):323-331.
  120. Thirstrup JP, Pertoldi C, Loeschcke V. Genetic analysis, breed assignment and conservation priorities of three native Danish horse breeds. Anim Genet 2008;39(5):496-505.
  121. Iannella G, Greco A, Didona D. Vitiligo: pathogenesis, clinical variants and treatment approaches. Autoimmun Rev 2016;15(4):335-343.
  122. Bellone RR, Holl H, Setaluri V. Evidence for a retroviral insertion in TRPM1 as the cause of congenital stationary night blindness and leopard complex spotting in the horse. PLoS One 2013;8(10):1-14.
  123. Bellone RR, Forsyth G, Leeb T. Fine-mapping and mutation analysis of TRPM1: a candidate gene for leopard complex (LP) spotting and congenital stationary night blindness in horses. Brief Funct Genom Proteom 2010;9(3):193-207.
    doi: 10.1093/bfgp/elq002google scholar: lookup
  124. Holl HM, Brooks SA, Archer S. Variant in the RFWD3 gene associated with PATN1, a modifier of leopard complex spotting. Anim Genet 2016;47(1):91-101.
    doi: 10.1111/age.12375google scholar: lookup
  125. Bellone RR, Brooks SA, Sandmeyer L. Differential gene expression of TRPM1, the potential cause of congenital stationary night blindness and coat spotting patterns (LP) in the appaloosa horse (Equus caballus). Genetics 2008;179(4):1861-1870.
  126. Schaefer RJ, Schubert M, Bailey E. Developing a 670k genotyping array to tag ~2M SNPs across 24 horse breeds. BMC Genomics 2017;18(1):1-18.
    doi: 10.1186/s12864-017-3943-8google scholar: lookup
  127. Taylor AW, Ng TF. Negative regulators that mediate ocular immune privilege. J Leukoc Biol 2018;103(6):1179-1187.
    doi: 10.1002/jlb.3mir0817-337rgoogle scholar: lookup
  128. Agarwal RK, Silver PB, Caspi RR. Rodent models of experimental autoimmune uveitis. Methods Mol Biol 2012;900:443-469.
  129. Egwuagu CE, Alhakeem SA, Mbanefo EC. Uveitis: molecular pathogenesis and emerging therapies. Front Immunol 2021;12:1-11.
    doi: 10.3389/fimmu.2021.623725google scholar: lookup
  130. Wu H, Deng Y, Feng Y. Epigenetic regulation in B-cell maturation and its dysregulation in autoimmunity. Cell Mol Immunol 2018;15(7):676-684.
    doi: 10.1038/cmi.2017.133google scholar: lookup
  131. Hou S, Li N, Liao X, Kijlstra A, Yang P. Uveitis genetics. Exp Eye Res 2020;190:107853.
  132. Ortiz-Fernández L, Sawalha AH. Genetics of Behçet's disease: functional genetic analysis and estimating disease heritability. Front Med (Lausanne) 2021;8:625710.
    doi: 10.3389/fmed.2021.625710google scholar: lookup
  133. Hughes T, Ture-Ozdemir F, Alibaz-Oner F, Coit P, Direskeneli H, Sawalha AH. Epigenome-wide scan identifies a treatment-responsive pattern of altered dna methylation among cytoskeletal remodeling genes in monocytes and cd4+ t cells from patients with behçet's disease. Arthritis Rheumatol 2014;66(6):1648-1658.
    doi: 10.1002/art.38409google scholar: lookup
  134. Jin F, Hu H, Xu M. Serum microRNA profiles serve as novel biomarkers for autoimmune diseases. Front Immunol 2018;9:1-9.
    doi: 10.3389/fimmu.2018.02381google scholar: lookup
  135. Wei Y, Li N, Zhao L. MicroRNAs and autoimmune-mediated eye diseases. Front Cell Dev Biol 2020;8:1-11.
    doi: 10.3389/fcell.2020.00818google scholar: lookup
  136. Guo D, Li J, Liu Z, Tang K, Song H, Bi H. Characterization of microRNA expression profiling in peripheral blood lymphocytes in rats with experimental autoimmune uveitis. Inflamm Res 2015;64(9):683-696.
    doi: 10.1007/s00011-015-0848-3google scholar: lookup
  137. Zhou Q, Xiao X, Wang C. Decreased microRNA-155 expression in ocular Behcet's disease but not in Vogt Koyanagi Harada syndrome. Investig Ophthalmol Vis Sci 2012;53(9):5665-5674.
    doi: 10.1167/iovs.12-9832google scholar: lookup
  138. Hou S, Ye Z, Liao D. MiR-23a, miR-146a and miR-301a confer predisposition to Vogt-Koyanagi-Harada syndrome but not to Behcet's disease. Sci Rep 2016;6:2-10.
    doi: 10.1038/srep20057google scholar: lookup
  139. Andersson L, Archibald AL, Bottema CD. Coordinated international action to accelerate genome-to-phenome with FAANG, the Functional Annotation of Animal Genomes project. Genome Biol 2015;16(1):4-9.
    doi: 10.1186/s13059-015-0622-4google scholar: lookup
  140. Tuggle CK, Giuffra E, White SN. GO-FAANG meeting: a gathering on functional annotation of animal genomes. Anim Genet 2016;47(5):528-533.
    doi: 10.1111/age.12466google scholar: lookup
  141. Burns EN, Bordbari MH, Mienaltowski MJ. Generation of an equine biobank to be used for Functional Annotation of Animal Genomes project. Anim Genet 2018;49(6):564-570.
    doi: 10.1111/age.12717google scholar: lookup
  142. Farh KKH, Marson A, Zhu J. Genetic and epigenetic fine mapping of causal autoimmune disease variants. Nature 2015;518(7539):337-343.
    doi: 10.1038/nature13835google scholar: lookup
  143. Moraes F, Góes A. A decade of human genome project conclusion: scientific diffusion about our genome knowledge. Biochem Mol Biol Educ 2016;44(3):215-223.
    doi: 10.1002/bmb.20952google scholar: lookup
  144. Encode Consortium, Carolina N, Hill C. For Junk DNA. Nature 2013;489(7414):57-74.
    doi: 10.1038/nature11247.angoogle scholar: lookup
  145. Dunham I, Kundaje A, Aldred SF. An integrated encyclopedia of DNA elements in the human genome. Nature 2012;489(7414):57-74.
    doi: 10.1038/nature11247google scholar: lookup
  146. Kingsley NB, Kern C, Creppe C. Functionally annotating regulatory elements in the equine genome using histone mark ChIP-Seq. Genes (Basel) 2020;11(1):3.
    doi: 10.3390/genes11010003google scholar: lookup
  147. Peng S, Bellone R, Petersen JL, Kalbfleisch TS, Finno CJ. Successful ATAC-Seq from snap-frozen equine tissues. Front Genet 2021;12:1-10.
    doi: 10.3389/fgene.2021.641788google scholar: lookup
  148. Donnelly CG, Bellone RR, Hales EN. Generation of a Biobank from two adult thoroughbred stallions for the Functional Annotation of Animal Genomes Initiative. Front Genet 2021;12:1-6.
    doi: 10.3389/fgene.2021.650305google scholar: lookup
  149. Dahlgren AR, Scott EY, Mansour T. Comparison of poly-A+ selection and rRNA depletion in detection of lncRNA in two equine tissues using RNA-seq. Non-coding RNA 2020;6(3):32.
    doi: 10.3390/ncrna6030032google scholar: lookup
  150. Finno CJ, Petersen JL, Bellone RR, MacLeod JN. Functional annotation of the equine genome. J Anim Sci Suppl 2016;4(94):51-53.
  151. Horvath S, Haghani A, Peng S. DNA methylation aging and transcriptomic studies in horses. Nat Commun 2022;13(1):1-13.
  152. Kingsley NB, Hamilton NA, Lindgren G. “Adopt-a-Tissue” initiative advances efforts to identify tissue-specific histone marks in the mare. Front Genet 2021;12:1-9.
    doi: 10.3389/fgene.2021.649959google scholar: lookup