PRA signifie Atrophie Progressive de la Rétine. Progressive signifie qu’elle se poursuit. C’est un processus qui se dégrade lentement (dégénérescence). PRA est le nom collectif donné à un ensemble de maladies qui sont toutes responsables de la dégénérescence de la rétine. La rétine comporte des cellules sensibles à la lumières (photorécepteurs) : les cellules de type « bâtonnets » (pour les basses lumières) et les cellules de type « cônes » (pour les hautes lumières). Ces cellules assurent la vision. Si ces « bâtonnets » ou ces « cônes » sont endommagés, la vue du chien se détériore. Si toutes ces cellules sont totalement atrophiées, le chien est complétement aveugle.PRA a un mode de transmission héréditaire génétiquement, de façon autosomale récessive. Autosomale signifie que la maladie n’est pas liée au sexe. Récessive signifie que la maladie doit être portée par les deux parents pour causer la maladie dans la descendance. Si un des parents n’a pas le gène mutant, les chiots ne seront pas malades, mais ils peuvent posséder le gène incriminé. Ils sont porteurs sains.
LOPRA signifie apparition tardive de l’atrophie progressive de la rétine. (Seulement pour le setter irlandais rouge) 
Rcd-4 PRA concerne la dégénérescence progressive des cellules cônes de la rétine (les cellules qui répondent à des niveaux de basse lumière).
 
Schéma du mode de transmission des maladies héréditaires dans le mode autosomal récessif :
Libre (exempt) : Ces chiens ont deux copies saines du gène. Ils ne peuvent pas développer le LOPRA par la mutation rec-4. Mais ils pourraient développer une autre forme de la maladie due à d’autres mutations du gène responsable du PRA.
 
Porteur Sain : Ces chiens possèdent une copie du gène mutant et une copie du gène normal. Ils ne peuvent pas développer la forme LOPRA de la maladie due à la mutation rcd-4. Ils transmettent cependant 50% du gène mutant à leur progéniture.
Ils peuvent également développer une autre forme de la maladie due à d’autres mutations du gène responsable du PRA.
 
Atteint : Ces chiens possèdent deux copies du gène mutant rcd-4 de la maladie PRA et peuvent la développer au cours de leur vie.
 

PROGRESSIVE RETINAL ATROPHY IN THE IRISH SETTER

Progressive Retinal Atrophy (PRA) is a well-recognised inherited condition that many breeds of dog are predisposed to.  The condition is characterised by bilateral degeneration of the retina which causes progressive vision loss that culminates in total blindness.  There is no treatment for PRA, of which several genetically distinct forms are recognised, each caused by a different mutation in a specific gene.  The various forms of PRA are typically breed-specific, with clinically affected dogs of the same breed usually sharing an identical mutation.  Clinically affected dogs of different breeds, however, usually have different mutations, although PRA-mutations can be shared by several breeds. 

A mutation for an early-onset form of PRA, known as rcd1, was identified in Irish Setters as long ago as 1993, and is well-documented to affect dogs from a few weeks of age.   More recently dogs have been identified with a seemingly different form of PRA that affects dogs later in their lives and is known to be different from rcd1.  This alternative form became known as “LOPRA” – for Late-Onset PRA.  Unlike rcd1, where all dogs became affected at almost exactly the same age the age of onset of dogs with LOPRA varied, from a few years of age (2-3 yo) up to old age (10-11 yo).  It was unclear whether these dogs all shared the same form of PRA or whether there were genetically distinct forms of PRA segregating in this breed.
Mutation Identified

In 2011 geneticists working in the Kennel Club Genetics Centre at the Animal Health Trust identified a recessive mutation that is associated with the development of LOPRA in the Gordon Setter.  Owners of Gordon Setters with LOPRA report that their affected dogs develop night blindness in the first instance, which is indicative of a rod-cone degeneration, so we have termed this mutation rcd4 (for rod-cone degeneration 4) to distinguish it from other, previously described, forms of rod-cone degeneration.

Following our work with rcd4 in the Gordon Setter we have found some Irish Setters that have been diagnosed with PRA also carry two copies of the rcd4 mutation.  As a result the AHT will make the rcd4 DNA test available to Irish Setters, from August 1st 2011.  The DNA test we are offering examines the DNA from each dog being tested for the presence or absence of this precise mutation and is thus a ‘mutation-based test’ and not a ‘linkage-based test’. 
Other Forms of PRA

The research we have carried out to identify the rcd4 mutation has revealed that there are at least three forms of PRA segregating in the Irish Setter; rcd1, rcd4 and an additional, third form, that has yet to be identified.  We know there is a third form of PRA because of the ten dogs with LOPRA, whose DNA we have been sent to analyse, only 7 have two copies of the rcd4 mutation.  The remaining 3 dogs do not carry either the rcd1 or rcd4 mutations, meaning their PRA must be due to another, as yet unidentified, mutation.  There is some evidence that this third form of PRA has, on average, an earlier age of onset than rcd4, but we need to examine more dogs before we can be confirm this.

The age at which dogs with the rcd4 mutation develop PRA seems to vary and we know about dogs as young as 4yo and as old as 10yo, that have been diagnosed with LOPRA, and that carry two copies of rcd4 mutation.  But it is important to remember that the age at which a dog is diagnosed with PRA can vary according to circumstances, and is not necessarily the same age at which it started to develop PRA.  For example, a dog whose PRA is detected at a routine eye examination will have an earlier age of diagnosis than a dog whose PRA was only detected once it started to lose its sight.  It is also possible that the dogs that have developed PRA very early also carry the mutation for the third, unidentified, form of PRA (as well as rcd4) and it is this ‘mid onset’ mutation that has caused them to develop PRA at a relatively young age.  More research will be required to understand the variability in age of onset more fully.

Our research indicates rcd4 is a common form of PRA among Irish Setters and the development of this test therefore enables breeders to slowly decrease the frequency of an important form of PRA in their lines.  However, because we know that at least one other form of LOPRA exists within the breed, we cannot guarantee that any dog will not develop PRA, even if they are clear of the rcd4 mutation. 
Rcd4 DNA Test

Breeders using the rcd4 DNA test will be sent results identifying their dog as belonging to one of three categories.  In all cases the terms ‘normal’ and ‘mutation’ refer to the position in the DNA where the rcd4 mutation is located; it is not possible to learn anything about any other region of DNA from the rcd4 DNA test.  

CLEAR: these dogs have two normal copies of DNA.  Clear dogs will not develop PRA as a result of the rcd4 mutation, although we cannot exclude the possibility they might develop PRA due to other mutations they might carry that are not detected by this test.

CARRIER: these dogs have one copy of the mutation and one normal copy of DNA. These dogs will not develop PRA themselves as a result of the rcd4 but they will pass the mutation on to approximately 50% of their offspring.We cannot exclude the possibility that carriers might develop PRA due to other mutations they might carry that are not detected by this test.
GENETICALLY AFFECTED: these dogs have two copies of the rcd4 mutation and will almost certainly develop PRA during their lifetime.  The average age of diagnosis for dogs with rcd4 is 10 yo, although there is considerable variation within the breed.
Advice

Our research has demonstrated that the frequency of the rcd4 mutation in Irish Setters is high and approximately 30-40% of dogs might be carriers. The mutation is recessive which means that all dogs can be bred from safely but carriers and genetically affected dogs should only be bred to DNA tested, clear dogs.  About half the puppies from any litter that has a carrier parent will themselves be carriers and any dogs from such litters that will be used for breeding should themselves be DNA tested prior to breeding so appropriate mates can be selected.  All puppies that have a genetically affected parent will be carriers.

It is advisable for all breeding dogs to have their eyes clinically examined by a veterinary ophthalmologist prior to breeding and throughout their lives so that any cases of PRA caused by additional mutations can be detected and that newly emerging conditions can be identified.
Having Your Dog Tested
The Irish Setter PRA rcd4 test will be available from 1st August 2011 and will cost £48 per dog including VAT (£40 for VAT-exempt countries outside the European Union). 

Sampling kits (containing mouth swabs and full instructions) are provided free-of-charge and can be ordered via the AHT webshop www.ahtdnatesting.co.uk from 1 August 2011. Please ensure that you only use swabs provided by the Animal Health Trust specifically for diagnostic testing - we may not be able to process other types of swabs.   

For dogs which have already been tested at the Animal Health Trust for RCD1 or CLAD, we may have archived samples which can be tested for RCD4. Please contact [email protected], giving the name of the dog(s) and the AHT reference number(s), for advice. The cost of testing these samples is £60 (including VAT) per sample.
Tests should be ordered from our online webshop
Enquiries or requests for swab kits should be made to Symone Ingram telephone +44 (0) 1638 555621 or fax +44 (0) 1638 555666 or via e-mail to [email protected].