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SMA (Spinal Muscular Atrophy )

Test number: 8118CGD

SMA

Breed
Maine Coon .
The Disease
SMA is a disorder caused by death of spinal cord neurons that activate skeletal muscles of the trunk and limbs. Loss of neurons in the first few months of life leads to muscle weakness and atrophy that first becomes apparent at 3-4 months of age.

Affected kittens develop an odd gait with a sway of the hindquarters and stand with the hocks nearly touching. They may also stand with toes out in the front.

By 5-6 months of age they are too weak in the hindquarters to readily jump up on furniture and often have a clumsy landing when jumping down. The long hair Maine Coon cats may hide it, but careful feeling of the limbs will reveal reduced muscle mass.

Trait of Inheritance
SMA is inherited as an autosomal recessive trait. So there are three conditions a cat can be: it can be clear or homozygous normal (genotype N/N) meaning that it does not carry the mutation and will not develop SMA. Since it also cannot pass the mutation onto its offspring, it can be mated to any other cat. A cat which has one copy of the gene with the mutation and one copy without the mutation is called a carrier or heterozygous (genotype N/SMA); while it will not be affected by SMA, it can pass the mutation onto its offspring and should therefore only be mated to clear cats.

Affected kitten have two gene copies with the mutation (genotype SMA/SMA or homozygous affected); they will always pass the mutated gene onto their offspring.


Inheritance : AUTOSOMAL RECESSIVE trait


 

Sire

 

Dam

 

Offspring

         
clear
clear
100% clear
         
clear
carrier
50%  clear + 50% carriers
         
clear
affected
100% carriers
         
carrier
clear
50%  clear + 50% carriers
         
carrier
carrier
25% clear + 25% affected + 50% carriers
         
carrier
affected
50% carriers + 50% affected
         
affected
clear
100%  carriers
         
affected
carrier
50% carriers + 50% affected
         
affected
affected
100% affected

 


Clear

Genotype: N / N [ Homozygous normal ]

The cat is noncarrier of the mutant gene.

It is very unlikely that the cat will develop SMA (Spinal Muscular Atrophy ). The cat will never pass the mutation to its offspring, and therefore it can be bred to any other cat.

 

Carrier

Genotype: N / SMA [ Heterozygous ]

The cat carries one copy of the mutant gene and one copy of the normal gene.

It is very unlikely that the cat will develop SMA (Spinal Muscular Atrophy ) but since it carries the mutant gene, it can pass it on to its offspring with the probability of 50%.

Carriers should only be bred to clear cats.

Avoid breeding carrier to carrier because 25% of their offspring is expected to be affected (see table above)

 

Affected

Genotype: SMA / SMA [ Homozygous mutant ]

 

The cat carries two copies of the mutant gene and therefore it will pass the mutant gene to its entire offspring.

The cat is likely to develop SMA (Spinal Muscular Atrophy ) and will pass the mutant gene to its entire offspring
Description

By DNA testing, the responsible mutation can be shown directly. This method provides a test with a very high accuracy and can be done at any age. It offers the possibility to distinguish not only between affected and clear cats, but also to identify clinically healthy carriers. This is an essential information for controlling the disease in the breed, as carriers are able to spread the disease in the population, but can not be identified by means of common laboratory diagnostic. To ensure maximum test reliability, the test is always performed in two independent test runs per sample.

Sample Requirements
Whole blood in EDTA tube (0.5 - 1 ml) or Buccal Swabs. Whole blood in EDTA tube (0.5 - 1 ml) or Buccal swabs. .
Turnaround
1 - 2 weeks
Price
£ 48.00 (including VAT)

To order:

  • Download Order Form from this link pdf

  • Complete the order form and send it together with your samples to the following address:

    Laboklin (UK),   125 Northenden Road, Manchester, M33 3HF

See Also:
HCM 1 (Hypertrophic cardiomyopathy ) Mutation Meurs (G-- > C) A31P  
Autoimmune Lymphoproliferative Syndrome (ALPS)  
HCM (Hypertrophic Cardiomyopathy)  
PKD (Feline Polycystic Kidney Disease)  
PK Deficiency (Pyruvate Kinase Deficiency)  
rdAc-PRA (Progressive Retinal Atrophy )  
Genetic Blood groups in cats  
Serological Evaluation of blood Groups  
Hypokalemia / Familial Episodic Hypokalaemic Polymyopathy (BHK)  
Head Defect (BHD) *  
Alpha-Mannosidosis (AMD)  
Congenital Myasthenic Syndrome (CMS)  
Gangliosidosis GM1  
Gangliosidosis GM2  
Gangliosidosis GM2  
Mucopolysaccharidosis Type VI (MPS VI)  
Mucopolysaccharidosis type VII (MPS VII)  
Myotonia Congenita (Fainting Goat)  
pd - Progressive Retinal Atrophy (pd-PRA)  
Progressive Retinal Atrophy (rdy-PRA)  
HCM1 + PK Deficiency + SMA  
Hypotrichosis and Short Life Expectancy  
Bengal Progressive Retinal Atrophy (PRA-b) *  
Special Offer: HCM, HCR, GSD4, PKD, PRA, PK-Def., SMA, Blood Groups  
Osteochondrodysplasia (Scottish Fold Osteodystrophy)  
Primary Congenital Glaucoma (PCG)  
Cystinuria (Feline Cystinuria) (CY)  
Glycogen Storage Disease ( GSD ) Type IV  

 
 
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