A custom capture sequence approach for oculocutaneous albinism identifies structural variant alleles at the OCA2 locus.

A custom capture sequence approach for oculocutaneous albinism identifies structural variant alleles at the OCA2 locus.
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眼形白化病的自定义捕获序列方法可以确定OCA2基因座的结构变体等位基因。

DOI:
10.1002/humu.24257
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发表时间:
2021-10
期刊:
影响因子:
3.9
通讯作者:
Adams DR
Adams DR
中科院分区:
医学2区
文献类型:
--
作者:
Loftus SK;Lundh L;Watkins-Chow DE;Baxter LL;Pairo-Castineira E;Nisc Comparative Sequencing Program;Jackson IJ;Oetting WS;Pavan WJ;Adams DR

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眼皮肤白化病 (OCA) 是一种遗传性色素生成障碍,表现为色素沉着不足和眼睛发育改变。已知 OCA 基因的外显子测序未能成功为大量受影响个体提供完整的分子诊断。我们使用短读长定制捕获测序对 OCA 个体的 DNA 进行测序,该测序针对已知 OCA 基因的编码、内含子和非编码调控区域以及 GWAS 相关色素沉着位点。我们鉴定了 OCA2 复合体结构变体 (CxSV),其定义为在天然位置上游的内含子 1 中重新引入的 143kb 反向片段。在筛选的 11/390 先证者中观察到相应的 CxSV 连接。 143kb CxSV 在一个家族中作为 143kb 区域的拷贝数变异 (CNV) 重复出现。在其余的 10/11 家族中,143kb CxSV 在同一区域获得了额外的 184kb 缺失,将 OCA2 的外显子 3-19 恢复到拷贝数中性状态。等位基因相关单倍型分析发现罕见的 SNV rs374519281 和 rs139696407 与两个 OCA2 等位基因中的 143kb CxSV 相关。对于常规分子评估未揭示双等位基因 OCA 诊断的个体,我们建议对这些单倍型相关的罕见变异进行初步筛查,然后对 OCA2 143kb CxSV 进行连接特异性验证。
Oculocutaneous albinism (OCA) is a heritable disorder of pigment production that manifests as hypopigmentation and altered eye development. Exon sequencing of known OCA genes is unsuccessful in producing a complete molecular diagnosis for a significant number of affected individuals. We sequenced the DNA of individuals with OCA using short-read custom capture sequencing that targeted coding, intronic and non-coding regulatory regions of known OCA genes and GWAS-associated pigmentation loci. We identified an OCA2 complex structural variant (CxSV), defined by a 143kb inverted segment reintroduced in intron 1, upstream of the native location. The corresponding CxSV junctions were observed in 11/390 probands screened. The 143kb CxSV presents in one family as a copy number variant (CNV) duplication for the 143kb region. In the remaining 10/11 families, the 143kb CxSV acquired an additional 184kb deletion across the same region, restoring exons 3–19 of OCA2 to a copy-number neutral state. Allele-associated haplotype analysis found rare SNVs rs374519281 and rs139696407 are linked with the 143kb CxSV in both OCA2 alleles. For individuals in which customary molecular evaluation does not reveal a biallelic OCA diagnosis, we recommend preliminary screening for these haplotype-associated rare variants, followed by junction-specific validation for the OCA2 143kb CxSV.
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