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Research

Congenital sucrase–isomaltase deficiency: identification of a common Inuit founder mutation

Julien L. Marcadier, Margaret Boland, C. Ronald Scott, Kheirie Issa, Zaining Wu, Adam D. McIntyre, Robert A. Hegele, Michael T. Geraghty and Matthew A. Lines
CMAJ February 03, 2015 187 (2) 102-107; DOI: https://doi.org/10.1503/cmaj.140657
Julien L. Marcadier
Department of Genetics (Marcadier), Children’s Hospital of Eastern Ontario; Division of Gastroenterology, Hepatology and Nutrition (Boland), Children’s Hospital of Eastern Ontario; Department of Pediatrics (Boland, Issa, Geraghty, Lines), University of Ottawa and Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ont.; Department of Pediatrics (Scott, Wu), University of Washington, Seattle, Wash.; Robarts Research Institute (McIntyre, Hegele), Schulich School of Medicine and Dentistry, Western University, London, Ont.; Metabolics (Geraghty, Lines), Children’s Hospital of Eastern Ontario, Ottawa, Ont.
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Margaret Boland
Department of Genetics (Marcadier), Children’s Hospital of Eastern Ontario; Division of Gastroenterology, Hepatology and Nutrition (Boland), Children’s Hospital of Eastern Ontario; Department of Pediatrics (Boland, Issa, Geraghty, Lines), University of Ottawa and Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ont.; Department of Pediatrics (Scott, Wu), University of Washington, Seattle, Wash.; Robarts Research Institute (McIntyre, Hegele), Schulich School of Medicine and Dentistry, Western University, London, Ont.; Metabolics (Geraghty, Lines), Children’s Hospital of Eastern Ontario, Ottawa, Ont.
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C. Ronald Scott
Department of Genetics (Marcadier), Children’s Hospital of Eastern Ontario; Division of Gastroenterology, Hepatology and Nutrition (Boland), Children’s Hospital of Eastern Ontario; Department of Pediatrics (Boland, Issa, Geraghty, Lines), University of Ottawa and Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ont.; Department of Pediatrics (Scott, Wu), University of Washington, Seattle, Wash.; Robarts Research Institute (McIntyre, Hegele), Schulich School of Medicine and Dentistry, Western University, London, Ont.; Metabolics (Geraghty, Lines), Children’s Hospital of Eastern Ontario, Ottawa, Ont.
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Kheirie Issa
Department of Genetics (Marcadier), Children’s Hospital of Eastern Ontario; Division of Gastroenterology, Hepatology and Nutrition (Boland), Children’s Hospital of Eastern Ontario; Department of Pediatrics (Boland, Issa, Geraghty, Lines), University of Ottawa and Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ont.; Department of Pediatrics (Scott, Wu), University of Washington, Seattle, Wash.; Robarts Research Institute (McIntyre, Hegele), Schulich School of Medicine and Dentistry, Western University, London, Ont.; Metabolics (Geraghty, Lines), Children’s Hospital of Eastern Ontario, Ottawa, Ont.
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Zaining Wu
Department of Genetics (Marcadier), Children’s Hospital of Eastern Ontario; Division of Gastroenterology, Hepatology and Nutrition (Boland), Children’s Hospital of Eastern Ontario; Department of Pediatrics (Boland, Issa, Geraghty, Lines), University of Ottawa and Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ont.; Department of Pediatrics (Scott, Wu), University of Washington, Seattle, Wash.; Robarts Research Institute (McIntyre, Hegele), Schulich School of Medicine and Dentistry, Western University, London, Ont.; Metabolics (Geraghty, Lines), Children’s Hospital of Eastern Ontario, Ottawa, Ont.
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Adam D. McIntyre
Department of Genetics (Marcadier), Children’s Hospital of Eastern Ontario; Division of Gastroenterology, Hepatology and Nutrition (Boland), Children’s Hospital of Eastern Ontario; Department of Pediatrics (Boland, Issa, Geraghty, Lines), University of Ottawa and Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ont.; Department of Pediatrics (Scott, Wu), University of Washington, Seattle, Wash.; Robarts Research Institute (McIntyre, Hegele), Schulich School of Medicine and Dentistry, Western University, London, Ont.; Metabolics (Geraghty, Lines), Children’s Hospital of Eastern Ontario, Ottawa, Ont.
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Robert A. Hegele
Department of Genetics (Marcadier), Children’s Hospital of Eastern Ontario; Division of Gastroenterology, Hepatology and Nutrition (Boland), Children’s Hospital of Eastern Ontario; Department of Pediatrics (Boland, Issa, Geraghty, Lines), University of Ottawa and Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ont.; Department of Pediatrics (Scott, Wu), University of Washington, Seattle, Wash.; Robarts Research Institute (McIntyre, Hegele), Schulich School of Medicine and Dentistry, Western University, London, Ont.; Metabolics (Geraghty, Lines), Children’s Hospital of Eastern Ontario, Ottawa, Ont.
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Michael T. Geraghty
Department of Genetics (Marcadier), Children’s Hospital of Eastern Ontario; Division of Gastroenterology, Hepatology and Nutrition (Boland), Children’s Hospital of Eastern Ontario; Department of Pediatrics (Boland, Issa, Geraghty, Lines), University of Ottawa and Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ont.; Department of Pediatrics (Scott, Wu), University of Washington, Seattle, Wash.; Robarts Research Institute (McIntyre, Hegele), Schulich School of Medicine and Dentistry, Western University, London, Ont.; Metabolics (Geraghty, Lines), Children’s Hospital of Eastern Ontario, Ottawa, Ont.
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Matthew A. Lines
Department of Genetics (Marcadier), Children’s Hospital of Eastern Ontario; Division of Gastroenterology, Hepatology and Nutrition (Boland), Children’s Hospital of Eastern Ontario; Department of Pediatrics (Boland, Issa, Geraghty, Lines), University of Ottawa and Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ont.; Department of Pediatrics (Scott, Wu), University of Washington, Seattle, Wash.; Robarts Research Institute (McIntyre, Hegele), Schulich School of Medicine and Dentistry, Western University, London, Ont.; Metabolics (Geraghty, Lines), Children’s Hospital of Eastern Ontario, Ottawa, Ont.
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  • For correspondence: mlines@cheo.on.ca
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    Figure 1:

    Sucrase–isomaltase catalyzes the hydrolysis of the α-1,2 glycosidic bond in sucrose (A), α-1,4 glycosidic bond in maltose (B) and α-1,6 glycosidic bond in isomaltose (C), as well as α-1,4 and α-1,6 limit dextrins generated from dietary starch by α-amylase (not depicted). Blue circles depict sites of hydrolysis.

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    Figure 2:

    Abdominal radiographs taken at 3 months of age showing severe bowel distension with multiple air-fluid levels in the small bowel. Severity of symptoms was such that the patient received a rectal biopsy for suspected Hirschsprung disease.

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    Figure 3:

    Sucrase–isomaltase is located at the brush-border membrane of the small intestine. Enzymatic domains are in the gut lumen, connected to the cellular membrane by a short linker sequence. The c.273_274delAG mutation (red circle) results in disruption of the usual reading frame (p.Gly92Leufs*8), completely abolishing both enzymatic activities (depicted in grey). Owing to nonsense-mediated decay, there is a high likelihood that the resulting messenger RNA product is targeted for degradation (i.e., is not translated and is functionally null).

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Canadian Medical Association Journal: 187 (2)
CMAJ
Vol. 187, Issue 2
3 Feb 2015
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Congenital sucrase–isomaltase deficiency: identification of a common Inuit founder mutation
Julien L. Marcadier, Margaret Boland, C. Ronald Scott, Kheirie Issa, Zaining Wu, Adam D. McIntyre, Robert A. Hegele, Michael T. Geraghty, Matthew A. Lines
CMAJ Feb 2015, 187 (2) 102-107; DOI: 10.1503/cmaj.140657

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Congenital sucrase–isomaltase deficiency: identification of a common Inuit founder mutation
Julien L. Marcadier, Margaret Boland, C. Ronald Scott, Kheirie Issa, Zaining Wu, Adam D. McIntyre, Robert A. Hegele, Michael T. Geraghty, Matthew A. Lines
CMAJ Feb 2015, 187 (2) 102-107; DOI: 10.1503/cmaj.140657
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