Germline mutations in Protection of Telomeres 1 in two families with Hodgkin lymphoma.

Germline mutations in Protection of Telomeres 1 in two families with Hodgkin lymphoma.
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DOI:
10.1111/bjh.15203
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发表时间:
2018-05
影响因子:
6.5
通讯作者:
Liu Y
Liu Y
中科院分区:
医学2区
文献类型:
--
作者:
McMaster ML;Sun C;Landi MT;Savage SA;Rotunno M;Yang XR;Jones K;Vogt A;Hutchinson A;Zhu B;Wang M;Hicks B;Thirunavukarason A;Stewart DR;Koutros S;Goldstein AM;Chanock SJ;Caporaso NE;Tucker MA;Goldin LR;Liu Y

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在先前对来自41个霍奇金淋巴瘤家族的患者进行的全外显子组测序中,我们确定了两个在POT1(D224N和Y36H)中具有不同杂合罕见编码变体的家族,这两个家族都位于该基因的高度保守区域。POT1D224N突变体在体外不结合单链端粒寡核苷酸,表明突变扰乱POT1结合端粒富含G的突出端的能力。与野生型细胞相比,表达POT1 D224 N的人HT 1080细胞和携带Y36 H的淋巴母细胞均显示端粒长度增加和脆性增加。这有力地表明,突变体POT1导致染色体不稳定性,并可能在这些家庭的淋巴瘤发生中发挥作用。
In a previous whole exome sequencing of patients from 41 families with Hodgkin lymphoma, we identified two families with distinct heterozygous rare coding variants in POT1 (D224N and Y36H), both in a highly conserved region of the gene. POT1 D224N mutant did not bind to a single-stranded telomere oligonucleotide in vitro suggesting the mutation perturbs POT1’s ability to bind to the telomeric G-rich overhang. Human HT1080 cells expressing POT1 D224N and lymphoblastoid cells carrying Y36H both showed increased telomere length and fragility in comparison to wild type cells. This strongly suggests that mutant POT1 causes chromosome instability and may play a role in lymphomagenesis in these families.
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