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Congenital myasthenic syndrome due to novel CHAT mutations in an ethnic kadazandusun family
- Source :
- Muscle & Nerve. 53:822-826
- Publication Year :
- 2016
- Publisher :
- Wiley, 2016.
-
Abstract
- Introduction Choline acetyltransferase (CHAT) gene mutations cause a rare presynaptic congenital myasthenic syndrome due to impaired acetylcholine resynthesis. Methods We report 2 Kadazandusun brothers with novel heterozygous CHAT mutations. Results The siblings were from a family of 7 children of nonconsanguineous parents, 3 who died from apneic crises. Both presented in infancy with ptosis and exertional limb weakness, but only 1 apnea episode was reported in the older sibling. The elder brother had a positive edrophonium test, and both were negative for acetylcholine receptor antibodies but improved with pyridostigmine treatment. A subsequent repetitive nerve stimulation test showed marked decremental response in the abductor digiti minimi only after prolonged ulnar nerve stimulation. Two novel CHAT gene mutations, p.Val306Leu and p.Ser704del were detected; the parents carried 1 mutation each. Conclusions Differences in survival demonstrate phenotypic variability within the same family and a relatively good long-term outcome of the surviving siblings.
- Subjects :
- 0301 basic medicine
medicine.medical_specialty
Pediatrics
Physiology
Edrophonium
Gene mutation
03 medical and health sciences
Cellular and Molecular Neuroscience
0302 clinical medicine
Ptosis
Physiology (medical)
Internal medicine
medicine
Repetitive nerve stimulation
Ulnar nerve
business.industry
Congenital myasthenic syndrome
medicine.disease
Choline acetyltransferase
body regions
030104 developmental biology
Endocrinology
Pyridostigmine
Neurology (clinical)
medicine.symptom
business
030217 neurology & neurosurgery
medicine.drug
Subjects
Details
- ISSN :
- 0148639X
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Muscle & Nerve
- Accession number :
- edsair.doi...........eb8ec21f6d2a0f7b6beb12f954796f14