The synovial sarcoma-associated SYT-SSX2 oncogene antagonizes the polycomb complex protein Bmi1.

The synovial sarcoma-associated SYT-SSX2 oncogene antagonizes the polycomb complex protein Bmi1.
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DOI:
10.1371/journal.pone.0005060
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发表时间:
2009
期刊:
影响因子:
3.7
通讯作者:
Eid JE
Eid JE
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Barco R;Garcia CB;Eid JE

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这项研究证明了滑膜肉瘤相关的SYT-SSX 2癌基因(也称为SS 18-SSX 2)对polycomb活性的失调。滑膜肉瘤是一种与复发性t(X:18)易位事件相关的软组织癌症,其产生两种融合蛋白SYT-SSX 1或SYT-SSX 2之一。易位产物在这种疾病中的作用知之甚少。我们目前的证据表明,SYT-SSX 2融合蛋白与polycomb抑制复合物相互作用,并调节其基因沉默活性。SYT-SSX 2导致polycomb亚基Bmi 1的不稳定,导致polycomb相关组蛋白H2 A泛素化的损害和polycomb靶基因的再激活。多梳复合物沉默在许多生理过程中起着至关重要的作用。近年来,许多报道暗示了多梳沉默功能在几种癌症中的获得。这项研究提供的证据表明,在适当的情况下,SYT-SSX 2癌基因的表达导致polycomb功能的丧失。它挑战了癌症仅与polycomb功能增加相关的概念,并表明polycomb活性的任何不平衡都可能导致细胞发生肿瘤。这些发现提供了SYT-SSX 2嵌合体可能有助于滑膜肉瘤发病机制的机制。
This study demonstrates deregulation of polycomb activity by the synovial sarcoma-associated SYT-SSX2 oncogene, also known as SS18-SSX2. Synovial sarcoma is a soft tissue cancer associated with a recurrent t(X:18) translocation event that generates one of two fusion proteins, SYT-SSX1 or SYT-SSX2. The role of the translocation products in this disease is poorly understood. We present evidence that the SYT-SSX2 fusion protein interacts with the polycomb repressive complex and modulates its gene silencing activity. SYT-SSX2 causes destabilization of the polycomb subunit Bmi1, resulting in impairment of polycomb-associated histone H2A ubiquitination and reactivation of polycomb target genes. Silencing by polycomb complexes plays a vital role in numerous physiological processes. In recent years, numerous reports have implicated gain of polycomb silencing function in several cancers. This study provides evidence that, in the appropriate context, expression of the SYT-SSX2 oncogene leads to loss of polycomb function. It challenges the notion that cancer is solely associated with an increase in polycomb function and suggests that any imbalance in polycomb activity could drive the cell toward oncogenesis. These findings provide a mechanism by which the SYT-SSX2 chimera may contribute to synovial sarcoma pathogenesis.
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