在ApcMin/+小鼠的辐射诱导小肠瘤中新发现的基因组突变模式
Daisuke Iizuka1,2, Megumi Sasatani2, Atsuko Ishikawa1
1Department of Radiation Effects Research, Institute for Radiological Science, National Institutes for Quantum Science and Technology, Chiba, Japan.
PloS one
|October 12, 2023
概括
辐射暴露增加了未识别的小肠瘤. 这些瘤表现出由于未知的机制,而不是促进剂高甲基化而导致细菌腺瘤多样性大肠杆菌 (Apc) 表达的减少,其中一些是由Apc突变引起的.
科学领域:
- 在瘤学瘤学.
- 遗传学 是一个遗传学.
- 辐射生物学 辐射生物学
背景情况:
- 在ApcMin/+小鼠中的小肠瘤可以根据Adenomatous polyposis coli (Apc) 基因异常进行分类.
- 之前的研究将增加的辐射剂量与"未识别"瘤的更高发病率联系起来.
- 这些辐射诱导的未识别瘤的分子基础仍然不清楚.
研究的目的:
- 调查驱动辐射诱导未确定的小肠瘤的发展的分子机制.
- 确定Apc基因表达和改变在未确定的瘤形成中的作用.
主要方法:
- 在瘤和正常组织中分析Apc mRNA表达水平.
- 对Apc促进剂甲基化的研究.
- 用对第18号染色体进行数组比较基因组杂交 (aCGH) 的染色体分析.
- 下一代测序 (NGS) 用于APC基因突变分析.
主要成果:
- 与正常组织相比,Apc mRNA表达在未识别的瘤中明显较低.
- 没有检测到Apc促进体区域的高甲基化.
- aCGH分析显示,在APC地区没有拷贝数的变化.
- NGS在一个未识别的瘤中发现了Apc的小删除,并且在约30%的分析瘤中发现了Apc的无意义/移突变.
结论:
- 辐射诱导 未确定的瘤主要是由于通过未知的调节机制减少Apc表达的结果,独立于促进剂高甲基化.
- 这些瘤的子集可能来自Apc基因内的未定义点突变,包括无意义突变.
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