Severe perinatal hypophosphatasia due to homozygous deletion of T at nucleotide 1559 in the tissue nonspecific alkaline phosphatase gene.
Prenat Diagn
; 23(9): 743-6, 2003 Sep.
Article
em En
| MEDLINE
| ID: mdl-12975786
ABSTRACT
OBJECTIVES:
Hypophosphatasia is an inherited disorder characterized by defective bone mineralization and deficiency of tissue nonspecific alkaline phosphatase (TNSALP) activity. This disorder is caused by various mutations in the TNSALP gene. We report here hypophosphatasia in two siblings, both of them severely affected by the perinatal (lethal) type.METHODS:
We diagnosed the first infant by clinical and radiologic manifestations, and laboratory findings. Laboratory findings were characterized by deficiency of serum alkaline phosphatase. Both parents and the second infant were then analyzed by molecular techniques.RESULTS:
The radiograph of the first infant showed severe hypomineralization of the skeleton. Molecular analysis of the second infant showed that this condition was caused by a homozygous single T nucleotide deletion at cDNA number 1559 (1559delT). Both parents were heterozygous carriers for this mutation, although they were not consanguineous.CONCLUSION:
This mutation has been frequently found in Japanese hypophosphatasia patients, but this is the first observation of a homozygous deletion. This report shows that homozygosity for the 1559delT mutation of the TNSALP gene results in a severe lethal phenotype.
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Base de dados:
MEDLINE
Assunto principal:
Complicações na Gravidez
/
Diagnóstico Pré-Natal
/
Fosfatase Alcalina
/
Aconselhamento Genético
/
Hipofosfatasia
Tipo de estudo:
Diagnostic_studies
Limite:
Adult
/
Female
/
Humans
/
Male
/
Newborn
/
Pregnancy
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article