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The same genetic defect causes Pompe disease in both humans and dogs
Date:2/15/2013

Pompe disease, a severe glycogen storage disease appearing in Lapphunds is caused by a genetic defect in acid α-glucosidase gene. The same genetic mutation also causes the equivalent disease in humans. Based on this finding, canine Pompe disease can now be diagnosed with a genetic test.

This research was completed at the Canine Genetics Research Group lead by professor Hannes Lohi in the University of Helsinki and Folkhlsan Research Center in Finland and will be published in PLOS ONE on February 14, 2013.

Human Pompe disease is caused by complete or partial deficiency of the acidic α-glucosidase enzyme. In humans, over 300 mutations have been discovered in the gene encoding this enzyme. Pompe disease is recessively inherited, therefore requiring the inheritance of the defected gene from both father and mother. Typically, human patients have two different mutations; one is inherited from father and the other from mother. If both mutations cause severe defect to the enzyme, the enzymatic activity is completely lost. This leads to infantile onset Pompe disease.

The average onset of the infantile disease is before two months of age and the affected children often die before the age of one year. Typical symptoms are floppy appearance, difficulties in sucking and swallowing, an enlarged heart which may lead to heart failure, difficulties in breathing, and respiratory infections. There is no cure for the disease, but enzyme replacement therapy relieves the symptoms and prolongs the patient's lifespan.

Canine Pompe disease is known to occur in Swedish Lapphunds and in this study it was revealed also from Finnish Lapphunds. Both the affected puppies and infantile onset patients lack functional acid α-glucosidase enzyme. Normally this enzyme breaks down the stored glycogen into glucose inside the lysosomes. When the α-glucosidase enzyme is not working properly, glycogen accumulates inside the cells of
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Contact: Hannes Lohi
hannes.lohi@helsinki.fi
358-919-125-085
University of Helsinki
Source:Eurekalert  

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