Perinatal hypophosphatasia caused by uniparental isodisomy.

Perinatal hypophosphatasia caused by uniparental isodisomy.
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单亲异构引起的围产期低磷酸酯酶症。

DOI:
10.1016/j.bone.2013.12.009
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发表时间:
2014
期刊:
影响因子:
4.1
通讯作者:
Shimada T.
Shimada T.
中科院分区:
医学2区
文献类型:
--
作者:
Watanabe A;Satoh S;Fujita A;Naing BT;Orimo H;Shimada T.

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低磷酸酶症(HPP)是一种遗传性疾病,其特征是由碱性磷酸酶基因(ALPL)突变引起的骨矿化缺陷。在临床上,这种疾病跨越了疾病严重程度的巨大连续性,根据发病年龄可以区分为六种形式。最严重的是常染色体隐性遗传的围产期形式,在日本是一种主要的产前骨骼发育不良。ALPL突变c.1559delT导致围产期HPP,并经常发生在日本。在日本,大多数围产期HPP患者是纯合子c.1559delT,他们的父母通常是杂合子,没有证据的consanguthinity.In这里,我们确定了一个胎儿与围产期HPP导致一个不寻常的机制,称为父亲单亲isodisomy(UPD)的1号染色体。对该患者ALP基因进行序列分析,发现存在纯合突变c.1559delT。我们怀疑UPD,因为父亲和母亲分别是杂合子和野生型。对1号染色体上的多态性微卫星标记和全基因组芯片的分析显示,该病例为父亲单亲遗传,排除了缺失或新突变,这是第一次描述UPD引起的围产期HPP。该报告还强调了UPD的非孟德尔遗传模式的低复发风险,以及确定患者中具有纯合突变的父母基因型以确认该病症是否由UPD引起的价值,即使突变被检测为热点,如文献中所述。
Hypophosphatasia (HPP) is an inherited disorder characterized by defective bone mineralization caused by mutations in the alkaline phosphatase gene (ALPL). Clinically, the disease spans a great continuum of disease severity and six forms can be distinguished according to the age of onset. The most severe is the autosomal recessive perinatal form, a major prenatal skeletal dysplasia in Japan. TheALPLmutation c.1559delT causes perinatal HPP and occurs frequently in the Japanese. Most patients with perinatal HPP in Japan are homozygous for c.1559delT, and their parents are usually heterozygous with no evidence of consanguinity.Here we identified a fetus with perinatal HPP resulting from an unusual mechanism known as paternal uniparental isodisomy (UPD) of chromosome 1. Sequence analysis ofALPLin the patient revealed the presence of the homozygous mutation c.1559delT. We suspected UPD because the father and mother were heterozygous and wild type, respectively. Analysis of polymorphic microsatellite markers spanning chromosome 1 and whole-genome arrays revealed a uniparental inheritance from the father and excluded deletions orde novomutations.This is the first description of perinatal HPP caused by UPD. This report also emphasizes the low recurrence risk of a non-Mendelian inheritance pattern in UPD and the value of determining parental genotypes with homozygous mutations in a patient to confirm whether the condition is caused by UPD or not, even when the mutation is detected as a hot spot, as described in the literature.
DOI: 10.1016/j.bone.2013.02.017
发表时间: 2013-07-01
期刊: BONE
影响因子: 4.1
作者:
Hofmann, C.;Liese, J.;Mentrup, B.
通讯作者: Mentrup, B.
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发表时间: 2012
期刊: --
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