Medical condition
| Jokela type spinal muscular atrophy | |
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| Other names | Late-onset spinal motor neuronopathy, LOSMoN; Spinal muscular atrophy, Jokela type (SMAJ) |
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| The disease is common in North Karelia | |
Jokela type spinal muscular atrophy (SMAJ), also known as late-onset spinal motor neuronopathy (LOSMoN), is an ultra-rare neuromuscular disorder characterized by muscle twitches and cramps. The symptoms appear in adulthood and gradually progress. The disease is caused by a mutation in the CHCHD10 gene and is inherited in an autosomal dominant pattern. It was first described by the Finnish neurologist Manu Jokela in 2011.
Symptoms and signs
The first symptoms include muscle cramps and muscle twitches affecting the upper and lower limbs. They appear usually after age of 40. The disease is slowly progressive with adult onset and results in weakness and mild muscle atrophy. The disease does not affect life expectancy. However, it is difficult to differentiate the disease from a more fatal amyotrophic lateral sclerosis in diagnosis.
Ultimately, SMAJ can lead to reduced ability in motor function for skills such as walking. SMAJ may also reduce one's nerve function and ability to sense vibrations.
Cause
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Epidemiology
As of 2016 it has been found only in a handful of families living in the Karelia region of Finland.
History
The disease was first described by the Finnish neurologist Manu Jokela in 2011 who has also identified the gene responsible for the disease.
See also
References
- ^ "Uusi hitaasti etenevä motoneuronitauti löydetty Suomesta (Väitös: LL Manu Jokela, 11.12.2015, neurologia)" (in Finnish). Archived from the original on 4 November 2016. Retrieved 3 November 2016.
- Penttilä, Sini; Jokela, Manu; Bouquin, Heidi; Saukkonen, Anna Maija; Toivanen, Jari; Udd, Bjarne (1 January 2015). "Late onset spinal motor neuronopathy is caused by mutation in CHCHD10". Ann. Neurol. 77 (1): 163–172. doi:10.1002/ana.24319. PMID 25428574. S2CID 34294906.
- ^ Viljakainen, Veera. "Perinnöllistä Late-Onset Spinal Motor Neuronopathy –motoneuronitautia aiheuttavan CHCHD10-geenin sekvensointi". www.theseus.fi (in Finnish). Retrieved 3 November 2016.
- "Spinal muscular atrophy, jokela type (Concept Id: C3554398) - MedGen - NCBI". www.ncbi.nlm.nih.gov. Retrieved 5 May 2021.
- ^ "Neurologi kuvasi uuden taudin - erityisen yleinen Pohjois-Karjalassa" (in Finnish). Archived from the original on 4 November 2016. Retrieved 3 November 2016.
Further reading
- Late-onset spinal motor neuronopathy- a new neuromuscular disease at www.doria.fi
- Penttilä, Sini; Jokela, Manu; Huovinen, Sanna; Saukkonen, Anna Maija; Toivanen, Jari; Lindberg, Christopher; Baumann, Peter; Udd, Bjarne (March 2014). "Late-onset spinal motor neuronopathy – A common form of dominant SMA". Neuromuscular Disorders. 24 (3): 259–268. doi:10.1016/j.nmd.2013.11.010. PMID 24360573. S2CID 100532.
External links
| Classification | D |
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