Implications of intragenic marker homozygosity and haplotype sharing in a rare autosomal recessive disorder: the example of the collagen type XVII (COL17A1) locus in generalised atrophic benign epidermolysis bullosa

Implications of intragenic marker homozygosity and haplotype sharing in a rare autosomal recessive disorder: the example of the collagen type XVII (COL17A1) locus in generalised atrophic benign epidermolysis bullosa
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罕见常染色体隐性遗传病中基因内标记纯合性和单倍型共享的意义:以广泛性萎缩性良性大疱性表皮松解症中 XVII 型胶原蛋白 (COL17A1) 基因座为例

DOI:
10.1007/s004390050496
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发表时间:
1997
期刊:
影响因子:
5.3
通讯作者:
M. Jonkman
M. Jonkman
中科院分区:
生物学2区
文献类型:
--
作者:
H. Scheffer;R. Stulp;E. Verlind;M. Van der Meulen;L. Bruckner;T. Gedde‐Dahl Jr;G. T. te Meerman;A. Sonnenberg;C. Buys;M. Jonkman

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泛发性萎缩性良性大疱性表皮病(GABEB)是一种隐性遗传的交界性大疱性表皮病。被认为可能参与这种疾病的基因是COL 17 A1,因为在大多数GABEB患者中,该基因的产物,180-kD大疱性类天疱疮抗原(BP 180),在皮肤中检测不到。我们已经确定了一个基因内COL 17 A1微卫星标记,其中83%的随机选择的对照个体是杂合的。我们观察到纯合性的不同等位基因的这种标志物在5个胶原蛋白XVII型阴性GABEB患者的不同欧洲血统。来自荷兰东部的3名患者的6个COL 17 A1等位基因中有5个是相同的,包括侧翼标记的单倍型也是相同的。在这5个等位基因中均发现了2342 delG突变。这证实了这样的预期,即由于低基因频率的常染色体隐性疾病(如胶原蛋白XVII型阴性GABEB)的遗传漂变和隐藏的近亲繁殖,来自有限地理区域的大多数疾病等位基因将是“血统相同的”。我们的研究结果表明,候选基因的参与可以通过寻找高度信息化的基因内标记的下降来确认。
Abstract Generalised atrophic benign epidermolysis bullosa (GABEB) is a form of junctional epidermolysis bullosa with a recessive mode of inheritance. The gene considered likely to be involved in this disease is COL17A1, since in the majority of GABEB patients the product of that gene, the 180-kD bullous pemphigoid antigen (BP180), is undetectable in skin. We have identified an intragenic COL17A1 microsatellite marker for which 83% of randomly selected control individuals are heterozygous. We observed homozygosity for different alleles of this marker in five out of six collagen type XVII-negative GABEB patients of different European descent. Five of the six COL17A1 alleles of three patients originating from the eastern part of The Netherlands were identical, as were the haplotypes including flanking markers. The 2342delG mutation was identified in all these five alleles. This confirms the expectation that due to genetic drift and hidden inbreeding for an autosomal recessive disorder with low gene frequency, such as collagen type XVII-negative GABEB, most disease alleles from a restricted geographical area will be “identical by descent”. Our results demonstrate that involvement of a candidate gene can be confirmed by looking for identity by descent of highly informative intragenic markers.
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