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    ABSTRACT: Congenital sucrase-isomaltase deficiency is a rare hereditary cause of chronic diarrhea in children. People with this condition lack the intestinal brush-border enzyme required for digestion of di- and oligosaccharides, including sucrose and isomaltose, leading to malabsorption. Although the condition is known to be highly prevalent (about 5%-10%) in several Inuit populations, the genetic basis for this has not been described. We sought to identify a common mutation for congenital sucrase-isomaltase deficiency in the Inuit population. We sequenced the sucrase-isomaltase gene, SI, in a single Inuit proband with congenital sucrase-isomaltase deficiency who had severe fermentative diarrhea and failure to thrive. We then genotyped a further 128 anonymized Inuit controls from a variety of locales in the Canadian Arctic to assess for a possible founder effect. In the proband, we identified a novel, homozygous frameshift mutation, c.273_274delAG (p.Gly92Leufs*8), predicted to result in complete absence of a functional protein product. This change was very common among the Inuit controls, with an observed allele frequency of 17.2% (95% confidence interval [CI] 12.6%-21.8%). The predicted Hardy-Weinberg prevalence of congenital sucrase-isomaltase deficiency in Inuit people, based on this single founder allele, is 3.0% (95% CI 1.4%-4.5%), which is comparable with previous estimates. We found a common mutation, SI c.273_274delAG, to be responsible for the high prevalence of congenital sucrase-isomaltase deficiency among Inuit people. Targeted mutation testing for this allele should afford a simple and minimally invasive means of diagnosing this condition in Inuit patients with chronic diarrhea. © Canadian Medical Association.
    Canadian Medical Association Journal 12/2014; 187(2). DOI:10.1503/cmaj.140657
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    ABSTRACT: A number of small studies have suggested a relationship between vitamin D status and severe acute lower respiratory tract infection (ALRI), including RSV-bronchiolitis. The objective of this study was to evaluate the relationship between vitamin D receptor (VDR) polymorphism and severe RSV-bronchiolitis through a systemic literature review and meta-analysis. A comprehensive electronic literature search was conducted to identify all studies published before January 2013. Two reviewers independently screened all abstracts, followed by the full text of potential articles to evaluate eligibility. Study methodological quality was evaluated using the Newcastle Ottawa scale and individual component analysis. Meta-analysis evaluated associations at the allele and genotype levels. Of 803 studies identified from our literature search, three met eligibility criteria. Two VDR polymorphisms were included in more than one study: TaqI (rs731236) and FokI (rs2228570). All three reported a positive relationship between the FokI minor allele and disease with random effects meta-analyses demonstrating a statistically significant relationship (OR 1.52, CI: 1.12, 2.05). Genotype analysis was highly suggestive of a dominant or incomplete dominance model with combined odds ratios for fF (OR 1.73, CI: 0.92-3.36) and ff (OR 2.24, CI: 0.98-5.14) compared to the FF genotype. No association between TaqI and severe RSV-bronchiolitis was evident at the allele or genotype level. Available literature supports an association between the FokI polymorphism and severe RSV disease. Determination of VDR receptor polymorphism status could help predict high-risk infants who might benefit from preventive measures. Pediatr Pulmonol. © 2013 Wiley Periodicals, Inc.
    Pediatric Pulmonology 08/2014; 49(8). DOI:10.1002/ppul.22877
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    ABSTRACT: Children must often be transported to dedicated pediatric centers to receive specialized medical and surgical care, which places them at risk for significant deterioration and life-threatening events. Studies designed to identify and mitigate these events have been limited by variability in the selection and definition of significant events. The objective of this study was to identify and evaluate indicators that represent significant events during the transport of pediatric patients and are relevant to future research initiatives in transport medicine.
    Pediatric Critical Care Medicine 06/2014; 15(7). DOI:10.1097/PCC.0000000000000171


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