Novel ITGB4 mutations in a patient with junctional epidermolysis bullosa-pyloric atresia syndrome and altered basement membrane zone immunofluorescence for the alpha6beta4 integrin.

Novel ITGB4 mutations in a patient with junctional epidermolysis bullosa-pyloric atresia syndrome and altered basement membrane zone immunofluorescence for the alpha6beta4 integrin.
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患有交界性表皮松解症大疱性幽门闭锁综合征的患者出现新的 ITGB4 突变,并且 α6β4 整合素的基底膜区免疫荧光发生改变。

DOI:
10.1111/1523-1747.ep12296240
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发表时间:
1997
期刊:
The Journal of investigative dermatology
影响因子:
--
通讯作者:
Uitto,J
Uitto,J
中科院分区:
--
文献类型:
--
作者:
Takizawa,Y;Shimizu,H;Nishikawa,T;Hatta,N;Pulkkinen,L;Uitto,J

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免疫荧光研究显示,伴有幽门闭锁的大疱性结缔组织表皮松解症(JEB-PA)中α6β4整合素的表达异常,α6β4整合素是半脂粒的组成部分。在这项研究中,我们检测了一个有两个JEB-PA患者的家庭,分别编码α6和β4整合素多肽的ITGA6和ITGB4基因突变。基于基因组DNA的PCR扩增、异源双工分析和直接核苷酸测序的突变检测策略未发现ITGA6的序列变异。然而,在两个ITGB4等位基因中都发现了假定的致病突变。具体来说,先证者是一个复合杂合子,具有1 bp的母亲缺失3434delT和8 bp的父亲缺失4050del8。这两种突变都导致移码和过早终止密码子在缺失的下游。在蛋白水平上,先证者皮肤的免疫荧光显示整联素α6呈阴性,β4亚基的染色明显降低。因此,该结果支持α6β4整合素亚基密切相关的概念,并进一步证明该整合素在提供真皮-表皮结合部生理稳定性方面的关键作用。
Immunofluorescence studies of junctional epidermolysis bullosa with pyloric atresia (JEB-PA) have suggested abnormalities in the expression of theα6β4 integrin, an integral component of hemidesmosomes. In this study, we examined a family with two affected individuals with JEB-PA for mutations in the ITGA6 and ITGB4 genes which encode theα6 andβ4 integrin polypeptides, respectively. Mutation detection strategy based on PCR amplification of genomic DNA, followed by heteroduplex analysis and direct nucleotide sequencing, did not reveal sequence variants in ITGA6. Putative pathogenic mutations, however, were identified in both ITGB4 alleles. Specifically, the proband was a compound heterozygote for a 1-bp maternal deletion, 3434delT, and an 8-bp paternal deletion, 4050del8. Both mutations result in a frameshift and premature termination codon downstream from the deletion. At the protein level, immunofluorescence of the skin of the proband revealed negative staining for the integrinα6 and markedly reduced staining for theβ4 subunit. Thus, the results support the notion of close association of theα6β4 integrin subunits and further attest to the critical role of this integrin in providing physiologic stability to the dermal-epidermal junction.
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发表时间: 1997
影响因子: 9.8
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DOI: --
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产前排除幽门闭锁-交界性大疱性表皮松解综合征。
DOI: --
发表时间: 1994
期刊: Journal of American Academy of Dermatology
影响因子: --
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影响因子: --
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