Exome sequencing identifies the cause of a mendelian disorder.

Exome sequencing identifies the cause of a mendelian disorder.
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DOI:
10.1038/ng.499
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发表时间:
2010-01
期刊:
影响因子:
30.8
通讯作者:
--
中科院分区:
生物学1区
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--
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我们展示了外显子组测序的首次成功应用,以发现一种罕见的原因不明的孟德尔疾病米勒综合征 (OMIM %263750) 的基因。对于三个独立亲属的四名受影响个体,我们捕获并测序了编码区域,平均覆盖率为 40X,并且有足够的深度来识别每个目标外显子组约 97% 的变异。通过对公共 SNP 数据库和少量 HapMap 外显子组进行筛选,在这 4 个病例中分别筛选出具有两个新变异的基因,确定了一个候选基因 DHODH,它编码嘧啶从头生物合成途径中的关键酶。桑格测序证实了另外三个米勒综合征家族中存在 DHODH 突变。对少数不相关的受影响个体进行外显子组测序是一种强大、有效的策略,可用于识别罕见孟德尔疾病的基因,并且可能会改变单基因性状的遗传分析。
We demonstrate the first successful application of exome sequencing to discover the gene for a rare, Mendelian disorder of unknown cause, Miller syndrome (OMIM %263750). For four affected individuals in three independent kindreds, we captured and sequenced coding regions to a mean coverage of 40X, and sufficient depth to call variants at ~97% of each targeted exome. Filtering against public SNP databases and a small number of HapMap exomes for genes with two novel variants in each of the four cases identified a single candidate gene, DHODH, which encodes a key enzyme in the pyrimidine de novo biosynthesis pathway. Sanger sequencing confirmed the presence of DHODH mutations in three additional families with Miller syndrome. Exome sequencing of a small number of unrelated, affected individuals is a powerful, efficient strategy for identifying the genes underlying rare Mendelian disorders and will likely transform the genetic analysis of monogenic traits.
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