A novel missense mutation in a neonate with nonketotic hyperglycinemia

Nonketotic hyperglycinemia (OMIM #605899), also known as glycine encephalopathy, is an autosomal recessive disorder of glycine metabolism caused by a defect in the glycine cleavage system. A term neonate developed progressive lethargy, muscular hypotonia, and respiratory insufficiency on day 2 after...

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Main Authors: Meyer, Sascha (Author) , Acquaviva, Cécile (Author) , Shamdeen, Mohammed Ghiath (Author) , Haas, Dorothea (Author) , Vianey-Saban, Christine (Author)
Format: Article (Journal)
Language:English
Published: 6 October 2010
In: Pediatric neurology
Year: 2010, Volume: 43, Issue: 5, Pages: 363-367
ISSN:1873-5150
DOI:10.1016/j.pediatrneurol.2010.05.025
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.pediatrneurol.2010.05.025
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0887899410002742
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Author Notes:Sascha Meyer, MD, Cécile Acquaviva, PharmD, Mohammed Ghiath Shamdeen, MD, Dorothea Haas, MD, and Christine Vianey-Saban, PharmD, PhD

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520 |a Nonketotic hyperglycinemia (OMIM #605899), also known as glycine encephalopathy, is an autosomal recessive disorder of glycine metabolism caused by a defect in the glycine cleavage system. A term neonate developed progressive lethargy, muscular hypotonia, and respiratory insufficiency on day 2 after birth, but no overt clinical seizures. Amplitude-integrated electroencephalography indicated a continuous burst-suppression pattern. The diagnosis of nonketotic hyperglycinemia was made biochemically and was confirmed by genetic studies, which revealed two missense mutations (one not previously described) within the glycine decarboxylase gene, GLDC. Nonketotic hyperglycinemia should be incorporated into the differential diagnosis of neonatal hypotonia, to avoid an erroneous diagnosis of sepsis or hypoxic ischemic injury. Amplitude-integrated electroencephalography may be helpful in the initial assessment of severely sick and hypotonic neonates without overt clinical seizures, and may direct further diagnostic evaluation. 
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