Novel nonsense mutation in UNC80 in a Turkish patient further validates the sociable skill and severe gastrointestinal problems as part of disease spectrum

NALCN channelosome complex contributes to maintaining resting membrane potential. The complex has four domains including two intracellular domains (UNC79 and UNC80), one transmembrane domain (NALCN) and one extracellular domain (FAM155A). Mutations in UNC80 were previously linked to infantile hypotonia with psychomotor retardation and characteristics facies 2. A 6-year-old male with neurodevelopmental disorder was referred for clinical exome sequencing. Sanger sequencing was conducted for variant confirmation and segregation analysis. The index had severe to profound neurodevelopmental delay, progressive failure to thrive, severe constipation and reflux, and sociable skills. Trio exome sequencing identified a homozygous c.6495G > A change causing p.Trp2165Ter in UNC80 in the proband. The variant was novel and predicted to be deleterious. We reported a novel nonsense mutation in UNC80. Our case also established the association between, and sociable skills and severe gastrointestinal problems

DETECTION AND SPREAD OF OXA-48-PRODUCING KLEBSIELLA OXYTOCA ISOLATES IN ISTANBUL, TURKEY

Five OXA-48 producing Klebsiella oxytoca strains isolated in April-July 2010 were analyzed. Antibiotic susceptibility tests were performed using disc diffusion method and VITEK 2 system. Carbapenemase activity was investigated using the Modified Hodge test. Beta-lactamase genes were detected by PCR and bla(OXA-48) was sequenced. Genetic relatedness between K. oxytoca isolates was investigated by pulse-field gel electrophoresis (PFGE). Carbapenemase activity was detected in 5 isolates by Modified Hodge test. Although all strains were resistant to ertapenem and imipenem, only one strain was also resistant to meropenem. Bla(OXA-48) in 4 isolates harbored 2 or 3 other ESBL types, namely, bla(TEM), bla(SHV), bla(CTX-M) or bla(VEB). PFGE revealed 3 different pulso-types among the K. oxytoca isolates. The presence of OXA-48 carbapenemase in other species of clinical isolates should also be considered