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First case of Roma ethnic origin with Andermann syndrome: A novel frameshift mutation in exon 20 of SLC12A6 gene
Author(s) -
Pacheva Iliyana,
Todorov Tihomir,
Halil Zeyra,
Yordanova Ralitsa,
Todorova Albena,
Geneva Ina,
Galabova Fani,
Ivanov Ivan
Publication year - 2019
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.61110
Subject(s) - frameshift mutation , founder effect , mutation , genetics , agenesis of the corpus callosum , muscle contracture , population , exon , corpus callosum , hereditary motor and sensory neuropathy , medicine , allele , pathology , biology , haplotype , anatomy , gene , environmental health
Andermann syndrome (AS) is caused by mutation of SLC12A6 gene. It comprises severe progressive sensory and motor neuropathy with early onset, varying degree of agenesis of corpus callosum (ACC) and mental retardation. AS occurs occasionally among population outside the northeastern Quebec—Saguenay‐Lac‐ St‐Jean and Charlevoix regions, inhabited by French Canadians. None of the described patients were of Roma ethnic origin. We present an 8‐month‐old infant of Roma ethnic origin with AS, caused by a novel frame shift mutation c.2604delT,p.(Asp868GlufsTer11) in exon 20 of SLC12A6 gene. Our case presented with several atypical findings: clinical presentation resembling “spinal muscular atrophy plus” syndrome; tongue fasciculations, which are not reported in the literature; early contractures of the wrists; normal motor action potentials and preserved sensory action potentials. Our patient is the first of Roma origin from nonconsanguineous parents, which suggests that this mutation might be widespread in the Roma population, although screening for this mutation in 140 alleles from Roma individuals originating from the same geographic region did not reveal further carriers, implying the mutation is rare. We recommend that Roma patients presenting with the clinical phenotype of AS should be tested for this mutation primarily.