[SMC] Exome sequencing and microarray identified a novel large exonic deletion in <em>SYT2</em> gene in an ultra-rare ca

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[SMC] Exome sequencing and microarray identified a novel large exonic deletion in <em>SYT2</em> gene in an ultra-rare ca

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J Genet. 2023;102:7.

ABSTRACT

Congenital myasthenic syndromes (CMSs) are a diverse group of diseases that have an underlying defect in transmission of signals from nerve cells to muscles that lead to muscular weakness. A 13-year-old male child born of consanguineous parents with profound motor developmental delay and normal cognition was referred to us. The younger male sibling aged 9 months was similarly affected. Electromyography (EMG) and nerve conduction studies revealed CMS. Clinical exome sequencing revealed a novel large deletion including the exons 2 to 9 of SYT2 gene which confirmed the diagnosis of presynaptic CMS type 7 in the siblings. The deletion was confirmed on a chromosomal exon microarray. The parents were confirmed carriers of the same mutation and were normal on clinical and EMG studies. This is the second case of CMS type 7 described with a large deletion of SYT2 gene, a first case with SYT2 gene mutation from India and overall 10th recessive case in the world.

PMID:36722210


Source: https://pubmed.ncbi.nlm.nih.gov/3672221 ... t6+86293ac
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