DNA Polymerase Beta Variants and Cancer

描述（由申请人提供）：聚合酶β变异和癌症。摘要：DNA聚合酶β在碱基切除修复（BER）中发挥重要作用，在内源性DNA损伤和电离辐射等物质引起的损伤修复中起重要作用。拟议研究的广泛长期目标是了解异常BER与癌变和使用包括电离辐射在内的药物治疗癌症之间的关系。该应用程序由三个具体目标组成。第一个目的是验证Pol β的癌症相关变异诱导小鼠肿瘤发生的假设。第二个目的是验证Pol β的种系变异与癌症有关的假设。为了这些目的，我们将描述自发和诱导的肿瘤发生和突变。我们最近发现了Pol β的结肠肿瘤变异，第三个目标是验证这些变异与癌症有关的假设。我们将采用焦点形成和锚定独立生长试验来表征细胞转化。基因组不稳定性将通过cII和染色体畸变测定来评估。这些研究的意义在于了解BER作为肿瘤抑制机制的作用。

DESCRIPTION (provided by applicant): Polymerase Beta Variants and Cancer. Abstract: DNA polymerase beta functions in base excision repair (BER) which is important for the repair of endogenous DNA damage and damage caused by agents such as ionizing radiation. The broad long-term objective of the proposed research is to understand how aberrant BER is linked to carcinogenesis and the treatment of cancer with agents including ionizing radiation. The application consists of three specific aims. The first aim is to test the hypothesis that a cancer-associated variant of Pol beta induces tumorigenesis in mice. The second aim is to test the hypothesis that a germline variant of Pol beta is linked to cancer. For these aims we will characterize spontaneous and induced tumorigenesis and mutagenesis. We have recently identified colon tumor variants of Pol beta and the third aim is to test the hypothesis that these variants are linked to cancer. We will employ the focus formation and anchorage independent growth assays to characterize cellular transformation. Genomic instability will be assessed using the cII and chromosomal aberration assays. The significance of these studies lies in understanding the role of BER as a tumor suppressor mechanism.