Childhood Hypophosphatasia Due to a de Novo Missense Mutation in the Tissue-Nonspecific Alkaline Phosphatase Gene

Hypophosphatasia is an inherited disorder due to mutations in the bone alkaline phosphatase (ALPL) gene. We report here a patient with childhood hypophosphatasia diagnosed at 1.4 yr because of pectus excavatum, large anterior fontanel, rachitic skeletal changes, and low serum alkaline phosphatase. S...

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Veröffentlicht in:The journal of clinical endocrinology and metabolism 2005-04, Vol.90 (4), p.2436-2439
Hauptverfasser: Taillandier, A., Sallinen, S.-L., Brun-Heath, I., De Mazancourt, P., Serre, J.-L., Mornet, E.
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container_issue 4
container_start_page 2436
container_title The journal of clinical endocrinology and metabolism
container_volume 90
creator Taillandier, A.
Sallinen, S.-L.
Brun-Heath, I.
De Mazancourt, P.
Serre, J.-L.
Mornet, E.
description Hypophosphatasia is an inherited disorder due to mutations in the bone alkaline phosphatase (ALPL) gene. We report here a patient with childhood hypophosphatasia diagnosed at 1.4 yr because of pectus excavatum, large anterior fontanel, rachitic skeletal changes, and low serum alkaline phosphatase. Sequencing of the ALPL gene produced evidence of two distinct missense mutations, E174K (c.571G>A), of maternal origin, and a de novo mutation, M45I (c.186G>C). The study of various microsatellite polymorphisms ruled out false paternity and therefore confirmed that M45I occurred de novo in the paternal germline or in the early development of the patient. Site-directed mutagenesis showed that M45I results in the absence of in vitro alkaline phosphatase activity, suggesting that the mutation is a severe allele. In conclusion, childhood hypophosphatasia in this patient is the result of compound heterozygosity for the moderate mutation E174K and a novel severe de novo mutation M45I.
doi_str_mv 10.1210/jc.2004-1456
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source MEDLINE; Oxford University Press Journals All Titles (1996-Current); EZB-FREE-00999 freely available EZB journals
subjects Adolescent
Alkaline Phosphatase - genetics
Biological and medical sciences
Endocrinopathies
Fundamental and applied biological sciences. Psychology
Humans
Hypophosphatasia - genetics
Male
Medical sciences
Mutation, Missense
Vertebrates: endocrinology
title Childhood Hypophosphatasia Due to a de Novo Missense Mutation in the Tissue-Nonspecific Alkaline Phosphatase Gene
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