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Pathway Description
Hypophosphatasia
Homo sapiens
Disease Pathway
Created: 2013-08-29
Last Updated: 2022-11-03
Infantile hypophosphatasia, also called I-HPP, is a severe, rare and fatal metabolic bone disease and an inborn error of metabolism. I-HPP is caused by a defective alkaline phosphatase, tissue-nonspecific isozyme, which catalyzes the conversion of pyridoxal 5'-phosphate into pyridoxal and conversion of pyridoxamine 5'-phosphate to pyridoxamine. Both products are important for later metabolism. Early symptoms of the disorder include poor feeding, irritability, hypotonia (state of low muscle tone), failure to thrive and seizures.. Treatment with enzyme replacement therapy using bone-targeting recombinant alkaline phosphatase is very effective. It is a very rare genetic disease happened in infant, with 90 cases have been reported to date.
References
Hypophosphatasia References
[Metagen: HYPOPHOSPHATASIA](http://metagene.de/program/d.prg?id_d=440)
[OMIM: 241500](http://omim.org/entry/241500})
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Pubmed: 3128473
Mornet E, Nunes ME: Hypophosphatasia
Pubmed: 20301329
Vitamin B6 Metabolism References
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Greenberg CR, Taylor CL, Haworth JC, Seargeant LE, Philipps S, Triggs-Raine B, Chodirker BN: A homoallelic Gly317-->Asp mutation in ALPL causes the perinatal (lethal) form of hypophosphatasia in Canadian mennonites. Genomics. 1993 Jul;17(1):215-7. doi: 10.1006/geno.1993.1305.
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Pubmed: 3532105
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Pubmed: 3165380
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Pubmed: 14702039
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Pubmed: 16625196
Neumeier M, Weigert J, Schaffler A, Weiss TS, Schmidl C, Buttner R, Bollheimer C, Aslanidis C, Scholmerich J, Buechler C: Aldehyde oxidase 1 is highly abundant in hepatic steatosis and is downregulated by adiponectin and fenofibric acid in hepatocytes in vitro. Biochem Biophys Res Commun. 2006 Nov 24;350(3):731-5. doi: 10.1016/j.bbrc.2006.09.101. Epub 2006 Sep 27.
Pubmed: 17022944
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Pubmed: 8248161
Hanna MC, Turner AJ, Kirkness EF: Human pyridoxal kinase. cDNA cloning, expression, and modulation by ligands of the benzodiazepine receptor. J Biol Chem. 1997 Apr 18;272(16):10756-60. doi: 10.1074/jbc.272.16.10756.
Pubmed: 9099727
Fang X, Zhou ZM, Lu L, Yin LL, Li JM, Zhen Y, Wang H, Sha JH: Expression of a novel pyridoxal kinase mRNA splice variant, PKH-T, in human testis. Asian J Androl. 2004 Jun;6(2):83-91.
Pubmed: 15154080
Hattori M, Fujiyama A, Taylor TD, Watanabe H, Yada T, Park HS, Toyoda A, Ishii K, Totoki Y, Choi DK, Groner Y, Soeda E, Ohki M, Takagi T, Sakaki Y, Taudien S, Blechschmidt K, Polley A, Menzel U, Delabar J, Kumpf K, Lehmann R, Patterson D, Reichwald K, Rump A, Schillhabel M, Schudy A, Zimmermann W, Rosenthal A, Kudoh J, Schibuya K, Kawasaki K, Asakawa S, Shintani A, Sasaki T, Nagamine K, Mitsuyama S, Antonarakis SE, Minoshima S, Shimizu N, Nordsiek G, Hornischer K, Brant P, Scharfe M, Schon O, Desario A, Reichelt J, Kauer G, Blocker H, Ramser J, Beck A, Klages S, Hennig S, Riesselmann L, Dagand E, Haaf T, Wehrmeyer S, Borzym K, Gardiner K, Nizetic D, Francis F, Lehrach H, Reinhardt R, Yaspo ML: The DNA sequence of human chromosome 21. Nature. 2000 May 18;405(6784):311-9. doi: 10.1038/35012518.
Pubmed: 10830953
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