Characterization of cryptic splicing in germline PTEN intronic variants in Cowden syndrome.

Characterization of cryptic splicing in germline PTEN intronic variants in Cowden syndrome.
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DOI:
10.1002/humu.23288
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发表时间:
2017-10
期刊:
影响因子:
3.9
通讯作者:
Eng C
Eng C
中科院分区:
医学2区
文献类型:
--
作者:
Chen HJ;Romigh T;Sesock K;Eng C

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肿瘤抑制基因PTEN的种系突变易患考登综合征(CS)、Bannayan-Riley-Ruvalcaba综合征和自闭症。基于证据的分类PTEN变体是有害的还是良性的,迫切需要准确的分子诊断和基因知情的遗传咨询。我们研究了来自61名CS患者的34种不同的生殖系PTEN内含子变体,表征了它们的PTEN mRNA加工,并分析了PTEN表达和P-AKT和P-ERK 1/2的下游读数。虽然我们发现剪接点附近的许多突变导致外显子跳跃,但我们也确定了导致提前终止或异构体使用转变的隐蔽剪接的存在。在剪接改变的组中,PTEN蛋白表达显著降低,而P-AKT,而不是P-ERK 1/2,显著增加。我们对这些PTEN内含子变异的观察有助于确定PTEN内含子变异的致病性,并有助于遗传咨询。
Germline mutations in the tumor‐suppressor gene PTEN predispose to subsets of Cowden syndrome (CS), Bannayan–Riley–Ruvalcaba syndrome, and autism. Evidence‐based classification of PTEN variants as either deleterious or benign is urgently needed for accurate molecular diagnosis and gene‐informed genetic counseling. We studied 34 different germline PTEN intronic variants from 61 CS patients, characterized their PTEN mRNA processing, and analyzed PTEN expression and downstream readouts of P‐AKT and P‐ERK1/2. While we found that many mutations near splice junctions result in exon skipping, we also identified the presence of cryptic splicing that resulted in premature termination or a shift in isoform usage. PTEN protein expression is significantly lower in the group with splicing changes while P‐AKT, but not P‐ERK1/2, is significantly increased. Our observations of these PTEN intronic variants should contribute to the determination of pathogenicity of PTEN intronic variants and aid in genetic counseling.
种系PTEN突变患者的终生癌症风险。
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