Isoenzyme Characterization of the Tick Rhipicephalus Appendiculatus Neumann (Acarina: Ixodidae) in Kenya

  • S. S. Kubasu
  • A. S. Young
  • G. R. Karuhize
Tick Immunology


Five populations of the tick, Rhipicephalus appendicular (collected from Kilifi, South Nyanza, and Uasin Gishu districts, and a Muguga laboratory strain) were subjected to isoenzyme analysis. Isoelectric focusing (IEF) of 11 enzymes on agarose gels was used to determine genetic differences between the tick populations. The isoenzyme profile results of the 11 enzymes investigated indicated that four loci, peptidase 1 (PEP 1:EC, PEP 2:EC, malate dehydrogenase (MDH:EC and glucose phosphate isomerase (GPI:EC showed differences in the populations. The Uasin Gishu population was distinct from all others. Ten out of the eleven enzymes studied were polymorphic in most of the populations while only one (i.e. PEP 7) was monomorphic.

Key Words

Tick populations isoenzymes isoelectric focusing polymorphism zymograms 


Cinq populations de Rhipicephalus appendiculatus provenant de Kilifi, de Kiambu, de South Nyanza, des districts de Uasin Gishu et du laboratoire de Muguga, ont été soumises à des analyses isoenzymatiques. Différentes populations génetiques de tiques ont été observées à partir du point isoelectrique sur gel d’agar agar de onze enzymes. Les profiles isoenzymatiques des onze enzymes ont montré que 4 loci, peptidase 1 (PEP 1: EC, PEP 2: EC, malate dehydrogenase (MDH: EC 1.1.137) et glucose phosphate isomerase (GPI: EC 53.1.9) témoignent de l’existence de populations hétérogènes; la population de Uasin Gishu étant distincte de toutes les autres. Dix des onze enzymes étudiés étaient polymorphiques pour toutes les populations alors que la PEP 7 se trouvait être monomorphique.


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Copyright information

© ICIPE 1992

Authors and Affiliations

  • S. S. Kubasu
    • 1
  • A. S. Young
    • 2
  • G. R. Karuhize
    • 3
  1. 1.Department of Invertebrate Zoology, Entomology SectionNational Museums of KenyaNairobiKenya
  2. 2.Protozoology Division, National Veterinary Research Centre, MugugaKenya Agricultural Research InstituteKikuyuKenya
  3. 3.Department of ZoologyUniversity of NairobiNairobiKenya

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