Source:http://linkedlifedata.com/resource/pubmed/id/12412800
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
11
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pubmed:dateCreated |
2002-11-4
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pubmed:abstractText |
Hypophosphatasia (HOPS) is a clinically heterogeneous heritable disorder characterized by defective skeletal mineralization, deficiency of tissue-nonspecific alkaline phosphatase (TNSALP) activity, and premature loss of deciduous teeth. The gene for TNSALP is located on chromosome 1p34-36.1 and consists of 12 exons and 11 introns. In our previous study, we found the novel point mutations (G1144A and T979C) from the genomic TNSALP gene of a patient with childhood HOPS. In this study, we have characterized the protein translated from the mutant G1144A gene. Wild-type and G1144A mutant-type TNSALP cDNA expression vector pcDNA3 have been constructed and transfected to COS-1 cells by lipofectin technique. After 48-h or 72-h transfection, cells were collected and homogenized using polytron homogenizer. After centrifugation at 10,000 g for 10 minutes, the supernatant was assayed. ALP activity was determined with 10 mM of p-nitrophenylphosphate as a substrate in 100 mM of 2-amino-2-methyl-1,3-propanediol-HCl buffer containing 5 mM of MgCl2. ALP activity of cells transfected with the mutant cDNA (G1144A) plasmid after 48-h or 72-h transfection exhibited 0.063 +/- 0.012 U/mg and 0.054 +/- 0.012 U/mg, respectively. As the enzymatic activity of the wild type was taken as 100%, the value of the mutant was estimated as 2.7% and 1.7%, respectively. These values were not significantly different from those found with mock-transfected cells, that is, 2.5% and 1.5%, respectively. This study indicated that the mutation (G1144A) produced the inactive ALP enzyme and would be a disease-causing mutation of the childhood-type HOPS.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Alkaline Phosphatase,
http://linkedlifedata.com/resource/pubmed/chemical/Buffers,
http://linkedlifedata.com/resource/pubmed/chemical/DNA, Complementary,
http://linkedlifedata.com/resource/pubmed/chemical/Magnesium Chloride,
http://linkedlifedata.com/resource/pubmed/chemical/Nitrophenols,
http://linkedlifedata.com/resource/pubmed/chemical/Organophosphorus Compounds,
http://linkedlifedata.com/resource/pubmed/chemical/nitrophenylphosphate
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pubmed:status |
MEDLINE
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pubmed:month |
Nov
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pubmed:issn |
0884-0431
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
17
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
1945-8
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:12412800-Adult,
pubmed-meshheading:12412800-Alkaline Phosphatase,
pubmed-meshheading:12412800-Animals,
pubmed-meshheading:12412800-Buffers,
pubmed-meshheading:12412800-COS Cells,
pubmed-meshheading:12412800-DNA, Complementary,
pubmed-meshheading:12412800-Enzyme Activation,
pubmed-meshheading:12412800-Genetic Vectors,
pubmed-meshheading:12412800-Humans,
pubmed-meshheading:12412800-Hypophosphatasia,
pubmed-meshheading:12412800-Magnesium Chloride,
pubmed-meshheading:12412800-Male,
pubmed-meshheading:12412800-Nitrophenols,
pubmed-meshheading:12412800-Organ Specificity,
pubmed-meshheading:12412800-Organophosphorus Compounds,
pubmed-meshheading:12412800-Point Mutation,
pubmed-meshheading:12412800-Transfection
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pubmed:year |
2002
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pubmed:articleTitle |
Function of mutant (G1144A) tissue-nonspecific ALP gene from hypophosphatasia.
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pubmed:affiliation |
Department of Hard Tissue Engineering, Graduate School, Tokyo Medical and Dental University, Japan.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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