在癌症易感性家族中发现的PIBF1 (p.R405Q) 胚胎变体损害了蛋白质的稳定性和功能
Lili Shao1,2, Liang Wen1,2, Qiao Xu2
1Department of Anesthesiology, The Second Xiangya Hospital, Central South University, Changsha, 410013, China.
Cancer cell international
|December 19, 2025
概括
在遗传性乳腺癌家族中发现了PIBF1基因的新突变,PIBF1 (p.R405Q). 这种突变会损害PIBF1的活性.
科学领域:
- 遗传学 遗传学 是一个
- 在瘤学瘤学.
- 分子生物学分子生物学
背景情况:
- 遗传性癌症综合征占所有癌症类型的5-10%,源于癌症易感基因的突变.
- 一个有遗传性癌症病史的中国家庭,包括试验组中的乳腺癌,被研究.
- PIBF1基因在癌症中的作用,特别是与DNA损伤修复和细胞循环调节有关,是正在进行的研究领域.
研究的目的:
- 在中国南部的一个家庭中识别与遗传性癌症相关的遗传突变.
- 为了研究特定的PIBF1突变 (p.R405Q) 对乳腺癌发展的功能影响.
- 探索PIBF1突变与其他DNA损伤修复基因在家族癌症中的潜在协同效应.
主要方法:
- 整体外基因组测序和生物信息学分析被用来识别遗传性癌症谱系中的突变.
- 进行了体外和体内实验,以评估PIBF1-WT和PIBF1 (p.R405Q) 对癌细胞的功能影响.
- 进行了DNA损伤反应途径的分析,包括γ-H2AX表达和西斯抗性.
主要成果:
- 鉴定了一种异构的误解突变PIBF1 (p.R405Q),与遗传性癌症表型分离.
- 野生型PIBF1 (PIBF1-WT) 通过抵抗DNA损伤和调节DNA修复,抑制了乳腺癌细胞的增殖,入侵和瘤发生.
- 该PIBF1 (p.R405Q) 突变通过影响蛋白质稳定性和DNA损伤修复,减弱或取消了PIBF1的瘤抑制功能.
结论:
- PIBF1在调节细胞循环和修复DNA损伤方面发挥着至关重要的作用,作为瘤抑制剂.
- PIBF1 (p.R405Q) 突变增加了癌症易感性,可能是家族遗传癌症综合征的多基因风险因素.
- 在像BRCA2和RAD51D这样的DNA损伤修复基因中同时发生的突变可能会在这个家族中协同促进癌症的进展.
相关概念视频
Abnormal Proliferation
5.1K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
5.1K
The Retinoblastoma Gene
4.6K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
4.6K
Loss of Tumor Suppressor Gene Functions
5.8K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
5.8K
piRNA - Piwi-interacting RNAs
7.5K
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
7.5K
Cancer-Critical Genes II: Tumor Suppressor Genes
9.3K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
9.3K
Covalently Linked Protein Regulators
8.6K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
8.6K


