First case of Roma ethnic origin with Andermann syndrome: A novel frameshift mutation in exon 20 of SLC12A6 gene.
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.
['Pacheva|Iliyana|I|0000-0003-0461-9065', 'Todorov|Tihomir|T|', 'Halil|Zeyra|Z|', 'Yordanova|Ralitsa|R|', 'Todorova|Albena|A|', 'Geneva|Ina|I|', 'Galabova|Fani|F|', 'Ivanov|Ivan|I|']
D061085:Agenesis of Corpus Callosum D000483:Alleles D004576:Electromyography D005006:Ethnicity D005091:Exons D005500:Follow-Up Studies D016368:Frameshift Mutation D056726:Genetic Association Studies D020022:Genetic Predisposition to Disease D005838:Genotype D006801:Humans D007223:Infant D008279:Magnetic Resonance Imaging D008297:Male D009431:Neural Conduction D010523:Peripheral Nervous System Diseases D010641:Phenotype D011792:Quebec D027981:Symporters
Andermann syndrome SLC12A6 gene agenesis of corpus callosum Roma population hereditary neuropathy