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Molecular Diagnosis of Rare Autosomal Recessive Escobar Syndrome in a Consanguineous Pakistani Family.

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BACKGROUND Escobar syndrome, a nonlethal variant of multiple pterygium syndromes (MPS), is a rare autosomal recessive disorder characterized by pterygia and multiple joint contractures along with other anomalies. Variants in… Click to show full abstract

BACKGROUND Escobar syndrome, a nonlethal variant of multiple pterygium syndromes (MPS), is a rare autosomal recessive disorder characterized by pterygia and multiple joint contractures along with other anomalies. Variants in cholinergic receptor nicotinic gamma subunit (CHRNG) have been previously reported in patients with Escobar syndrome. OBJECTIVE We studied a consanguineous Pakistani family affected with Escobar syndrome to identify the underlying genetic defect through short tandem repeat (STR) genotyping and direct DNA sequencing. RESULTS Genotyping with microsatellite markers (D2S427, D2S2344, and D2S206) revealed linkage of the disease phenotype in the family to the CHRNG locus. Using Sanger sequencing, we identified a homozygous nonsense CHRNG variant c.136C>T (p.R46*), predicted to produce a truncated protein that leads to acetylcholine receptor deficiency, causing MPS. The unaffected parents and siblings in the family were heterozygous carriers of this disease-causing variant. CONCLUSION We report the identification of a nonsense CHRNG variant in a consanguineous Pakistani family affected with Escobar syndrome.

Keywords: rare autosomal; pakistani family; family; autosomal recessive; escobar syndrome; consanguineous pakistani

Journal Title: Genetic testing and molecular biomarkers
Year Published: 2018

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