Voici un article très intéressant concernant le mode de transmission du CECS, il a été défini que la transmission était de type autosomal récessif.
désolé c'est en anglais, et je nai pas eu le temps de le traduire (source borderterrier.de)
Clinical and genetic research into cramping episodes in Border Terriers
Dr. Juliane von Kurnatowski
Source: Der Terrier, July 2007
Within the framework of her dissertation Juliane von Kurnatowski of the Clinic for small companion animals of the Stiftung Tierärztliche Hochschule Hannover investigated the clinical and genetic aspects of cramping episodes in Border Terriers.
Because of the frequent occurrence of cramping episodes in certain subpopulations of this dog breed and the repeated occurrence of them in some families, a genetic background was assumed. By means of a questionnaire distributed among Border Terrier owners 267 forms with information on 365 dogs could be analysed. In the first place the prevalence (=the number of cases in the population at a given moment in time) of cramping episodes in Border Terriers in Germany was estimated and at the same time an evaluation of the nature of the cramping episodes was carried out.
Through pedigree examination and segregation analysis (= assessment through statistic calculations of the most likely mode of inheritance in the families used in the project) the mode of inheritance could in the end be determined. In 70% of the affected Border Terriers (47 in all) cramping episodes occurred which affected the whole body, 45% of which became suddenly rigid in a characteristic way.
Just like BorderTerriers Dachshunds, Poodles and other terrier breeds may suffer from episodes which cause the whole body to become rigid. On the other hand cramping episodes occur in dog breeds like Golden and Labrador Retrievers, Bernese and Irish Wolfdogs that also affect the whole body, but during which the dogs often lose consciousness. Stages of stiffening alternate with paddling movements.
The Border Terriers participating in this research were on average 3,73 years old and had their first cramping episode at an average of 3,13 years.
Very extensive diagnostics yielded no deviations from the norm. Through supplementary laboratory research (metabolic screening = determining the levels of amino acids, organic acids, purins, pyrimidins in urine and blood serum) the existence of a congenital metabolic defect could be ruled out. It is assumed that in this breed we are dealing with an idiopathic (=without identifiable cause) form of epilepsy.
The average Inbreeding Coefficient (COI) of the Border Terriers was 3,85%, with the affected litters showing a not-significant higher COI than the non-affected litters.
Because of the very high prevalence of 13,1% and a high heritability of 0,51 the presence of a genetic effect should be considered very likely.
Furthermore it was proven that gender (males) and age (young dogs) have a significant influence on the occurrence of the condition. 10 linked pedigrees of at least 5 generations which produced 31 of the 47 affected Border Terriers were drawn up. From the pedigree analysis it became clear that the majority of the affected dogs were produced by healthy parents. The combinations of either two healthy parents or a healthy and an affected parent produced litters consisting of healthy and affected progeny. The repeated occurrence of affected dogs in different litters from the combination of the same sire but with different dams or the combination of the same dams with different sires strengthens the suspicion that we are dealing with a genetic component.
In view of the suspicion of a genetic component segregation analysis was executed to establish the mode of inheritance. This resulted in the belief that the mode of inheritance in the case of the cramping episodes in the Border Terrier is autosomal-recessive.
In view of the established genetic background and the autosomal-recessive mode of inheritance affected aniumals and their first grade relatives (full siblings, parents) should not be used for breeding.
Furthermore a combination which has produced affected progeny should not be repeated.
The identification of the genes responsible for the cramping episodes would be of great help to prevent more effectively the occurrence of the disease and to identify carriers of the condition in time.
DR. Juliane von Kurnatowski
Tierarztpraxis und Klink für Kleintiere
Dr. Henning Kloene
Hinterm Junkernhof 8
D-31848 Bad Münder, OT Eimbeckhausen
The complete dissertation can be downloaded from this URL:
http://elib.tiho-hannover.de/dissertations/kurnatowskij_ss07.html