Clinical and EEG phenotypes of epilepsy in the baboon (Papio hamadryas spp.)

C. Ákos Szabó, M. Michelle Leland, Koyle Knape, James J. Elliott, Vicky Haines, Jeff T. Williams

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Spontaneous seizures have been reported in several baboon subspecies housed at the Southwest Foundation for Biomedical Research (SFBR), including Papio hamadryas anubis as well as cynocephalus/anubis and other hybrids. This study classified clinical and electroencephalographic (EEG) phenotypes in these subspecies based upon interictal and ictal findings, as well as photosensitivity, by scalp EEG. One hundred baboons underwent 1-h EEG studies with photic stimulation (PS), 49 with previously witnessed seizures and 51 without. The animals were classified according to these electroclinical phenotypes: presence or absence of interictal epileptic discharges (IEDs), seizures and photoparoxysmal or photoconvulsive responses. Effects of age, gender, and species on EEG phenotypes were also examined. Six discrete electroclinical phenotypes were identified. Generalized IEDs of 2-3, 4-6, and/or 6-7 Hz were identified in 67 baboons. Epileptic seizures were recorded in 40 animals, including myoclonic and generalized tonic-clonic seizures. Thirty-three animals were photosensitive. Although the prevalence of IEDs and seizures were similar in seizure and asymptomatic animals, photosensitivity was more prevalent in the seizure animals (p = 0.001). P.h. anubis/cynocephalus hybrids were more likely to be photosensitive than P.h. anubis (p = 0.004). The reliable characterization of distinct epileptic phenotypes in this pedigreed colony is critical to the success of future genetic analyses to identify genetic factors underlying their epilepsy.

Original languageEnglish (US)
Pages (from-to)71-80
Number of pages10
JournalEpilepsy Research
Volume65
Issue number1-2
DOIs
StatePublished - Jun 1 2005

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Keywords

  • Electroencephalography
  • Epilepsy
  • Papio
  • Phenotypes
  • Photosensitivity

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

Cite this

Szabó, C. Á., Leland, M. M., Knape, K., Elliott, J. J., Haines, V., & Williams, J. T. (2005). Clinical and EEG phenotypes of epilepsy in the baboon (Papio hamadryas spp.). Epilepsy Research, 65(1-2), 71-80. https://doi.org/10.1016/j.eplepsyres.2005.05.003