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Pathway Description
Non-Ketotic Hyperglycinemia
Homo sapiens
Disease Pathway
Created: 2013-08-19
Last Updated: 2022-10-24
Non Ketotic Hyperglycinemeia (Glycine encephalopathy; Glycine cleavage system deficiency; NKH) is caused by mutations in several genes in the mitochondrial glycine cleavage system. These include the genes encoding P protein (GLDC), T protein (GCST), and, in one case, the H protein (GCSH). Most patients with GCE (Glycine Encephalopathy, or NKH) have a defect in the GLDC gene.The enzyme system for cleavage of glycine (glycine cleavage system), which is confined to the mitochondria, is composed of 4 protein components: P protein (a pyridoxal phosphate-dependent glycine decarboxylase), H protein (a lipoic acid-containing protein), T protein (a tetrahydrofolate-requiring enzyme), and L protein (a lipoamide dehydrogenase). NKH is characterized by accumulation of glycine in plasma, spinal fluid and urine. Symptoms include seizures, respiratory distress, mental retardation, chorea, visual impairment and hydrocephalus.
References
Non-Ketotic Hyperglycinemia References
[Uniprot: P48728](http://www.uniprot.org/uniprot/P48728)
[OMIM: Entry 605899](http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=605899)
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Pubmed: 6683804
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Pubmed: 6336599
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Pubmed: 1943691
Glycine and Serine Metabolism References
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Pubmed: 3418353
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Pubmed: 10591208
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Pubmed: 10767172
Binzak BA, Wevers RA, Moolenaar SH, Lee YM, Hwu WL, Poggi-Bach J, Engelke UF, Hoard HM, Vockley JG, Vockley J: Cloning of dimethylglycine dehydrogenase and a new human inborn error of metabolism, dimethylglycine dehydrogenase deficiency. Am J Hum Genet. 2001 Apr;68(4):839-47. doi: 10.1086/319520. Epub 2001 Feb 28.
Pubmed: 11231903
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Kure S, Narisawa K, Tada K: Structural and expression analyses of normal and mutant mRNA encoding glycine decarboxylase: three-base deletion in mRNA causes nonketotic hyperglycinemia. Biochem Biophys Res Commun. 1991 Feb 14;174(3):1176-82. doi: 10.1016/0006-291x(91)91545-n.
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Kume A, Koyata H, Sakakibara T, Ishiguro Y, Kure S, Hiraga K: The glycine cleavage system. Molecular cloning of the chicken and human glycine decarboxylase cDNAs and some characteristics involved in the deduced protein structures. J Biol Chem. 1991 Feb 15;266(5):3323-9.
Pubmed: 1993704
Hayasaka K, Nanao K, Takada G, Okamura-Ikeda K, Motokawa Y: Isolation and sequence determination of cDNA encoding human T-protein of the glycine cleavage system. Biochem Biophys Res Commun. 1993 Apr 30;192(2):766-71. doi: 10.1006/bbrc.1993.1480.
Pubmed: 7916605
Nanao K, Takada G, Takahashi E, Seki N, Komatsu Y, Okamura-Ikeda K, Motokawa Y, Hayasaka K: Structure and chromosomal localization of the aminomethyltransferase gene (AMT) Genomics. 1994 Jan 1;19(1):27-30.
Pubmed: 8188235
Yang X, Wang Z, Li X, Liu B, Liu M, Liu L, Chen S, Ren M, Wang Y, Yu M, Wang B, Zou J, Zhu WG, Yin Y, Gu W, Luo J: SHMT2 Desuccinylation by SIRT5 Drives Cancer Cell Proliferation. Cancer Res. 2018 Jan 15;78(2):372-386. doi: 10.1158/0008-5472.CAN-17-1912. Epub 2017 Nov 27.
Pubmed: 29180469
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Pubmed: 29452640
Feigenbaum AS, Robinson BH: The structure of the human dihydrolipoamide dehydrogenase gene (DLD) and its upstream elements. Genomics. 1993 Aug;17(2):376-81. doi: 10.1006/geno.1993.1335.
Pubmed: 8406489
Otulakowski G, Robinson BH: Isolation and sequence determination of cDNA clones for porcine and human lipoamide dehydrogenase. Homology to other disulfide oxidoreductases. J Biol Chem. 1987 Dec 25;262(36):17313-8.
Pubmed: 3693355
Pons G, Raefsky-Estrin C, Carothers DJ, Pepin RA, Javed AA, Jesse BW, Ganapathi MK, Samols D, Patel MS: Cloning and cDNA sequence of the dihydrolipoamide dehydrogenase component human alpha-ketoacid dehydrogenase complexes. Proc Natl Acad Sci U S A. 1988 Mar;85(5):1422-6. doi: 10.1073/pnas.85.5.1422.
Pubmed: 3278312
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