OMIA:001757-9796 : Epilepsy, juvenile idiopathic in Equus caballus (horse)

Categories: Nervous system phene , Behaviour / neurological phene

Links to possible relevant human trait(s) and/or gene(s) in OMIM: 121200 (trait) , 121201 (trait)

Mendelian trait/disorder: unknown

Considered a defect: yes

Species-specific symbol: JIE

Mapping: Ciosek et al. (2023) "conducted a GWAS in 60 cases of JIE and 120 genetically matched controls, identifying loci suggesting JIE is not caused by a single locus."

Markers: Polani et al. (2022, initially reported as 2018): "Initial whole genome comparisons between a small cohort of nine diagnosed foals (cases [diagnosed primarily on clinical grounds]) and 27 controls from other horse breeds identified variants uniquely shared amongst the case cohort. Further validation via targeted resequencing of these variants, that pertain to non-intergenic regions, on additional eleven case individuals revealed a single 19bp deletion coupled with a triple-C insertion (Δ19InsCCC) within the TRIM39-RPP21 gene readthrough that was uniquely shared across all case individuals, and absent from three additional Arabian controls." Given the limitations of these data, Polani et al. (2022) concluded that "Further evaluation of the sensitivity and specificity of the Δ19InsCCC allele within additional cohorts of the Arabian horse is warranted in order to validate its credibility as a marker for JIE". Rivas et al. (2019) provided further evaluation by genotyping (via sequencing) the Δ19InsCCC variant in "nine EEG-phenotyped affected and nine unaffected Egyptian Arabian horses". The results showed that "There was no significant genotypic (P = 1.00) or allelic (P = 0.31) association with the ∆19InsCCC variant and JIE status [as definitively determined by EEG]." Rivas et al. (2019) concluded that "The previously reported markers in TRIM39-RPPB1 are therefore not associated with JIE in well-phenotyped samples."

Breed: Arab (Horse) (VBO_0000905).
Breeds in which the phene has been documented. (If a likely causal variant has been documented for the phene, see the variant table breeds in which the variant has been reported).

Cite this entry

Nicholas, F. W., Tammen, I., & Sydney Informatics Hub. (2024). OMIA:001757-9796: Online Mendelian Inheritance in Animals (OMIA) [dataset].


Note: the references are listed in reverse chronological order (from the most recent year to the earliest year), and alphabetically by first author within a year.

2024 Aleman, M., Benini, R., Elestwani, S., Vinardell, T. :
Juvenile idiopathic epilepsy in Egyptian Arabian foals, a potential animal model of self-limited epilepsy in children. J Vet Intern Med 38:449-459, 2024. Pubmed reference: 38041837. DOI: 10.1111/jvim.16965.
Durward-Akhurst, S.A., Marlowe, J.L., Schaefer, R.J., Springer, K., Grantham, B., Carey, W.K., Bellone, R.R., Mickelson, J.R., McCue, M.E. :
Predicted genetic burden and frequency of phenotype-associated variants in the horse. Sci Rep 14:8396, 2024. Pubmed reference: 38600096. DOI: 10.1038/s41598-024-57872-8.
2023 Ciosek, J., Kimes, A., Vinardell, T., Miller, D.C., Antczak, D.F., Brooks, S. :
Juvenile idiopathic epilepsy in Arabian horses is not a single-gene disorder. J Hered 114:488-491, 2023. Pubmed reference: 37145017. DOI: 10.1093/jhered/esad029.
2022 Polani, S., Dean, M., Lichter-Peled, A., Hendrickson, S., Tsang, S., Fang, X., Feng, Y., Qiao, W., Avni, G., Kahila Bar-Gal, G. :
Sequence variant in the TRIM39-RPP21 gene readthrough is shared across a cohort of Arabian foals diagnosed with juvenile idiopathic epilepsy. J Genet Mutat Disord 1:103, 2022. Pubmed reference: 35465405.
2019 Rivas, V.N., Aleman, M., Peterson, J.A., Dahlgren, A.R., Hales, E.N., Finno, C.J. :
TRIM39-RPP21 variants (∆19InsCCC) are not associated with juvenile idiopathic epilepsy in Egyptian Arabian horses. Genes (Basel) 10:816, 2019. Pubmed reference: 31623255. DOI: 10.3390/genes10100816.
2015 Lacombe, V.A. :
Seizures in horses: diagnosis and classification. Vet Med (Auckl) 6:301-308, 2015. Pubmed reference: 30101115. DOI: 10.2147/VMRR.S62078.
2012 Lacombe, V.A., Mayes, M., Mosseri, S., Reed, S.M., Fenner, W.R., Ou, H.T. :
Epilepsy in horses: aetiological classification and predictive factors. Equine Vet J 44:646-51, 2012. Pubmed reference: 22168451. DOI: 10.1111/j.2042-3306.2011.00527.x.
Lichter-Peled, A., Polani, S., Stanyon, R., Rocchi, M., Kahila Bar-Gal, G. :
Role of KCNQ2 and KCNQ3 genes in juvenile idiopathic epilepsy in Arabian foals. Vet J , 2012. Pubmed reference: 23182620. DOI: 10.1016/j.tvjl.2012.08.024.
van der Ree, M., Wijnberg, I. :
A review on epilepsy in the horse and the potential of Ambulatory EEG as a diagnostic tool. Vet Q , 2012. Pubmed reference: 23163553. DOI: 10.1080/01652176.2012.744496.
2006 Aleman, M., Gray, L.C., Williams, D.C., Holliday, T.A., Madigan, J.E., LeCouteur, R.A., Magdesian, K.G. :
Juvenile idiopathic epilepsy in Egyptian Arabian foals: 22 cases (1985-2005). J Vet Intern Med 20:1443-9, 2006. Pubmed reference: 17186863.

Edit History

  • Created by Frank Nicholas on 30 Nov 2012
  • Changed by Frank Nicholas on 22 Oct 2019
  • Changed by Imke Tammen2 on 15 Nov 2022
  • Changed by Imke Tammen2 on 07 May 2023
  • Changed by Imke Tammen2 on 16 Jun 2024