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Congenital Hypomyelinating Polyneuropathy (HPN) is an inherited neurological disorder that primarily affects the peripheral nervous system.
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Especificaciones
| Breeds | |
|---|---|
| Gene | |
| Organ | |
| specimen | Hisopo, sangre EDTA, sangre Heparina, Semen, Tejido |
| Mode of Inheritance | |
| Chromosome | |
| Also known as | |
| Year Published |
Información específica de la prueba
Congenital Hypomyelinating Polyneuropathy (HPN) is an inherited neurological disorder that primarily affects the peripheral nervous system. It is the canine variant of Charcot-Marie-Tooth Syndrome occurring in humans. It is characterized by abnormal development or insufficient formation of myelin sheet, which is a protective covering around nerve fibers. Myelin is essential for the proper transmission of nerve signals, and without it, nerve function is impaired.
In Golden Retrievers there are currently three mutations found in different genes that cause HPN. These are probably inherited in an autosomal recessive way. The mutation tested for here is found in the myotubulin-related protein 2 (MTMR2) gene located within the splice site at the end of exon 12. It is related to the human Charcot-Marie-Tooth disease type 4B1.
The other variants involve mutations in the myelin protein zero (MPZ) gene and the SH3 domain and tetratricopeptide repeats 2 (SH3TC2) gene. These variants are analysed in different tests.
Características clínicas
All three mutations (MTMR2, MPZ, SH3TC2) lead to similar symptoms: muscle weakness, ataxia, tremors, hypotonia (low muscle tone), and delayed motor development. The severity and progression of these symptoms can vary. For example, MPZ mutations may lead to more severe muscle wasting or atrophy over time, while SH3TC2 and MTMR2 mutations tend to primarily cause weakness and coordination problems without significant muscle wasting.
Dogs with MTMR2 mutation typically show clinical signs early in life, often between 2 to 6 months of age. However, signs can sometimes be detected in puppies as early as a few weeks old.
Información adicional
Referencias
Pubmed ID: 37400349
Omia ID: 2727