A common CHRNE mutation in Brazilian patients with congenital myasthenic syndrome View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-01-30

AUTHORS

Eduardo de Paula Estephan, Cláudia Ferreira da Rosa Sobreira, André Clériston José dos Santos, Pedro José Tomaselli, Wilson Marques, Roberta Paiva Magalhães Ortega, Marcela Câmara Machado Costa, André Macedo Serafim da Silva, Rodrigo Holanda Mendonça, Vitor Marques Caldas, Antonio Alberto Zambon, Osório Abath Neto, Paulo Eurípedes Marchiori, Carlos Otto Heise, Umbertina Conti Reed, Yoshiteru Azuma, Ana Töpf, Hanns Lochmüller, Edmar Zanoteli

ABSTRACT

The most common causes of congenital myasthenic syndromes (CMS) are CHRNE mutations, and some pathogenic allelic variants in this gene are especially frequent in certain ethnic groups. In the southern region of Brazil, a study found the c.130dupG CHRNE mutation in up to 33% of families with CMS. Here, we aimed to verify the frequency of this mutation among individuals with CMS in a larger cohort of CMS patients from different areas of Brazil and to characterize clinical features of these patients. Eighty-four patients with CMS, from 72 families, were clinically evaluated and submitted to direct sequencing of the exon 2 of CHRNE. The c.130dupG mutation was found in 32 patients (23 families), with 26 patients (19 families, 26.3%) in homozygosis, confirming its high prevalence in different regions of Brazil. Among the homozygous patients, the following characteristics were frequent: onset of symptoms before 2 years of age (92.3%), little functional restriction (92.3%), fluctuating symptoms (100%), ocular muscle impairment (96.1%), ptosis (100%), limb weakness (88.4%), response to pyridostigmine (100%), facial involvement (77%), and bulbar symptoms (70.8%). The pretest probability of finding at least one allele harbouring the c.130dupG mutation was 38.1%. Selecting only patients with impaired eye movement together with limb weakness and improvement with pyridostigmine, the probability increases to 72.2%. This clinical pre-selection of patients is likely a useful tool for regions where CHRNE mutations have a founder effect. In conclusion, the CHRNE mutation c.130dupG leads to fairly benign natural course of the disease with relative homogeneity. More... »

PAGES

708-713

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00415-018-8736-8

DOI

http://dx.doi.org/10.1007/s00415-018-8736-8

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1100719847

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/29383513


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