HCM Ragdoll - Feline Hypertrophic Cardiomyopathy
What is HCM Ragdoll – Feline Hypertrophic Cardiomyopathy?
On the left a healthy heart, on the right a heart with HCM (thicker walls)
The symptoms of HCM are shortness of breath on exertion, increased heart rate, cardiac arrhythmia, heart murmur or breathing problem.
Clinical diagnosis is possible through echocardiography, electrocardiography and radiography. On the other hand, these examinations do not make it possible to diagnose a cat which does not have the symptoms of HCM but which will develop it during its life (cat reaches heterozygote or reaches homozygote).
The limits of these observations also lie in the difficulty of interpretation of the images and the lack of cooperation of echocardiographed cats.
Realization nke mkpụrụ ndụ ihe nketa ule
DNA tests for the detection of the genetic HCM can be performed at any age. Like all genetic tests, these tests are very reliable.
The test is performed from a Buccal swab, quick and easy to perform.Here is the list of the different types of samples that are accepted for this test :
- Buccal swab
- Blood in EDTA tube
- Blood na akọrọ tube
Screening and interpretation of results
In Ragdoll a different mutation of the MYBPC3 gene has been identified. This substitution of C to T is responsible for the formation of tryptophan instead of arginine at position 820 (R820W).
This mutation causes a change in the secondary structure of the protein. The Ragdoll-specific test aims to detect this mutation by sequencing
This mutation is hereditary according to a dominant autosomal mode with complete penetrance. This means that this mutation is transmitted to the offspring (hereditary), that it is localized on the non-sexual chromosomes (autosomal), that a single copy of the defective gene causes HCM (dominant) and that the presence of the mutation necessarily leads to HCM (complete penetrance).
A result achieved heterozygous or reached homozygous means that the cat carries the genetic mutation of HCM. This cat will necessarily develop the HCM during his life.
HCM therefore presents a major risk:
- When it comes to a cat for the company, it is important to test the kitten to see if it will develop by the HCM later.
- When the cat is intended for reproduction, it is essential to perform this test to be sure that the latter will not transmit the HCM to their offspring.
The test does not determine the severity and age at which the cat began to have HCM.
Dị ụdị maka ule: HCM Ragdoll – Feline Hypertrophic Cardiomyopathy
Ndị na-esonụ ụdị a ghọtara:
Understanding pụta nke ule: HCM Ragdoll – Feline Hypertrophic Cardiomyopathy
Gene mutation: MYBPC c.2460C>T
si n'aka ruo n'aka: autosomal dominant (ozi ọzọ)
Penetrance: complete (ozi ọzọ)
|Test N'ihi||HCM Ragdoll – Feline Hypertrophic Cardiomyopathy ọnọdụ (MYBPC c.2460C>T)||Health ọnọdụ|
|N/N||No copy of the HCM mutation||Animal nkịtị (ikpochapụ)|
|HCM/N||1 copy of the HCM mutation||Animal bụ, ga-ma ọ bụ nwere ike na-emetụta|
|HCM/HCM||2 copies of the HCM mutation||Animal bụ, ga-ma ọ bụ nwere ike na-emetụta|
Cross table nke ule: HCM Ragdoll – Feline Hypertrophic Cardiomyopathy
|nne N/N||nne HCM/N||nne HCM/HCM|
|Nna N/N||100% N/N||50% N/N|
|Nna HCM/N||50% N/N|
|Nna HCM/HCM||100% HCM/N||50% HCM/N|
Certificate atụ maka ule: HCM Ragdoll – Feline Hypertrophic Cardiomyopathy
Pịa na atụ akwụkwọ n'okpuru imeghe ya.
K.M. Meurs, et al.: A cardiac myosin binding protein C mutation in the Maine coon cat with familial hypertrophic cardiomyopathy, Hum. Mol. Genet. 14 (2005) 3587-3593.
K. M. Meurs, et al.: A substitution in the myosin binding protein C gene in ragdoll hypertrophic cardiomyopathy, Genomics 90 (2007) 261-264
Longeri M, Ferrari P, Knafelz P, Mezzelani A, Marabotti A, Milanesi L, Pertica G, Polli M, Brambilla PG, Kittleson M, Lyons LA, Porciello F.: Myosin-binding protein C DNA variants in domestic cats (A31P, A74T, R820W) and their association with hypertrophic cardiomyopathy. J Vet Intern Med. 2013 Mar-Apr;27(2):275-85.