Abstract：
BACKGROUND AND AIMS:Hypophosphatasia is a genetic disorder characterized by defective bone and tooth mineralization and a deficiency of serum and bone alkaline phosphatase activity. To date, few studies have identified gene mutations in Chinese patients with hypophosphatasia. We sought to characterize the clinical manifestations and identify the mutations associated with the disease in Chinese hypophosphatasia patients. METHODS:All 12 exons and the exon-intron boundaries of the ALPL gene were amplified and directly sequenced in two probands from unrelated Chinese families. The mutation sites were identified in other unaffected members of these two families and 100 healthy controls. RESULTS:In family 1, the proband displayed one novel splice site mutation, c.298-1G>A, which consisted of a homozygous G>A transition at nucleotide 298-1 in intron 4. The proband's mother displayed the heterozygous G/A ALPL gene mutation, but her father was identified as G/G homozygous. A paternity test ruled out false paternity and therefore confirmed that this splicing mutation occurred de novo either in the paternal germline or in the early development of the patient. In family 2, the proband revealed a novel missense mutation (c.1271T>C) in exon 11, which resulted in p.Val424Ala in the mature ALPL polypeptide. Furthermore, c.298-1G>A and c.1271T>C mutations were not found in unaffected family members of these two Chinese families and 100 unrelated controls. CONCLUSIONS:Our study shows that the novel de novo splicing mutation c.298-1G>A in intron 4 and the missense mutation c.1271T>C in exon 11 of the ALPL gene are responsible for hypophosphatasia in some Chinese patients.
journal_name
Arch Med Resjournal_title
Archives of medical researchauthors
Zhang H,Ke YH,Wang C,Yue H,Hu WW,Gu JM,Zhang ZLdoi
10.1016/j.arcmed.2012.01.004subject
Has Abstractpub_date
2012-01-01 00:00:00pages
21-30issue
1eissn
0188-4409issn
1873-5487pii
S0188-4409(12)00005-7journal_volume
43pub_type
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