First Two Case Reports of Becker's Type Myotonia Congenita in Colombia: Clinical and Genetic Features.
Becker type myotonia congenita
Colombia
muscular diseases
myotonia congenita
siblings case reports
Journal
The application of clinical genetics
ISSN: 1178-704X
Titre abrégé: Appl Clin Genet
Pays: New Zealand
ID NLM: 101579789
Informations de publication
Date de publication:
2021
2021
Historique:
received:
06
06
2021
accepted:
26
10
2021
entrez:
23
12
2021
pubmed:
24
12
2021
medline:
24
12
2021
Statut:
epublish
Résumé
Becker's type myotonia congenita is an autosomal recessive nondystrophic skeletal muscle disorder characterized by muscle stiffness and the inability of muscle relaxation after voluntary contraction. It is caused by mutations in the We present two male siblings from Colombia with Latino ancestry, without parental consanguinity, with myotonia during voluntary movements, muscle hypertrophy of lower extremities, transient weakness, and severe muscle fatigue after exercise from three years of age. A genetic panel for dystrophic muscle disorders and a muscle biopsy were both negative. Genetic testing was performed in their second decade of life. Both patients' exomic sequencing test reported the mutation c.1129C >T (p.Arg377*) affecting exon 10 of the To our knowledge, these are the first cases of Becker's type myotonia congenita reported in Colombia. Increasing awareness of healthcare providers for this type of disease in the region could lead to the identification of undiagnosed patients. Limited availability of medical geneticists as well as genetic testing may be the cause of the lack of previous description of cases, in addition to the delay in the diagnosis of the patients. Further epidemiological studies can reveal underdiagnosed myotonias in the country and in the Latin-American region.
Sections du résumé
BACKGROUND
BACKGROUND
Becker's type myotonia congenita is an autosomal recessive nondystrophic skeletal muscle disorder characterized by muscle stiffness and the inability of muscle relaxation after voluntary contraction. It is caused by mutations in the
CASE PRESENTATION
METHODS
We present two male siblings from Colombia with Latino ancestry, without parental consanguinity, with myotonia during voluntary movements, muscle hypertrophy of lower extremities, transient weakness, and severe muscle fatigue after exercise from three years of age. A genetic panel for dystrophic muscle disorders and a muscle biopsy were both negative. Genetic testing was performed in their second decade of life. Both patients' exomic sequencing test reported the mutation c.1129C >T (p.Arg377*) affecting exon 10 of the
CONCLUSION
CONCLUSIONS
To our knowledge, these are the first cases of Becker's type myotonia congenita reported in Colombia. Increasing awareness of healthcare providers for this type of disease in the region could lead to the identification of undiagnosed patients. Limited availability of medical geneticists as well as genetic testing may be the cause of the lack of previous description of cases, in addition to the delay in the diagnosis of the patients. Further epidemiological studies can reveal underdiagnosed myotonias in the country and in the Latin-American region.
Identifiants
pubmed: 34938096
doi: 10.2147/TACG.S323559
pii: 323559
pmc: PMC8687676
doi:
Types de publication
Case Reports
Langues
eng
Pagination
473-479Informations de copyright
© 2021 Olave-Rodriguez et al.
Déclaration de conflit d'intérêts
The authors declare that they have no competing interests.
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