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Identification of a novel mutation in the coding region of the grey-lethal geneOSTM1in human malignant infantile osteopetrosis

Identification of a novel mutation in the coding region of the grey-lethal geneOSTM1in human malignant infantile osteopetrosis

Authors :
Uwe Kornak
Udo Bode
Carola Hasan
Christian Kubisch
Alfredo Ramirez
Julia Faupel
Ingrid Goebel
Anne Stiller
Christina Stockle
Susanne Beyer
Source :
Human Mutation. 23:471-476
Publication Year :
2004
Publisher :
Hindawi Limited, 2004.

Abstract

Arnold Munnich Autosomal recessive malignant infantile osteopetrosis (ARO) is characterized by severe osteosclerosis, pathologic fractures, hepatosplenomegaly, and pancytopenia. The pathophysiological basis is inadequate bone resorption due to osteoclast dysfunction. In the majority of cases, mutations in either of two human genes cause this fatal disorder: TCIRG1, encoding a subunit of the osteoclast H + -ATPase, and the voltage-gated chloride channel gene CLCN7. We excluded both genes in a small inbred family with malignant infantile osteopetrosis and undertook linkage analysis of several candidate loci that are involved in murine osteopetrosis. A region spanning more than 20 cM between the markers D6S1717 and D6S1608 on chromosome 6q21 was found to be homozygous in the affected child. This locus is syntenic to the genomic region harboring the gene for the osteopetrotic mutant mouse grey-lethal (gl). Recently, mutations in a novel gene of unknown function were described in the grey-lethal mouse and in one human patient. Mutation screening of the grey-lethal gene (OSTM1), revealed a homozygous 2-bp deletion in exon 2 (c.415_416delAG) in the affected child. No mutations could be found in six independent ARO patients who had tested negative for mutations in TCIRG1 and CLCN7. In summary, we describe the identification of a novel mutation in the coding sequence of the human grey-lethal gene, which is the second OSTM1 mutation found in human ARO, confirming the involvement of this gene in the pathogenesis of this severe bone disease.

Details

ISSN :
10597794
Volume :
23
Database :
OpenAIRE
Journal :
Human Mutation
Accession number :
edsair.doi...........feb061a7fe03653f602ba4d6c36008a6
Full Text :
https://doi.org/10.1002/humu.20028