相关实验视频
Updated: Jul 10, 2025

08:16
Comparative Lesions Analysis Through a Targeted Sequencing Approach
Published on: November 5, 2019
6.8K
在瘤发生过程中体癌突变中,对和更高阶的表观效应在体癌突变中产生
Jorge A Alfaro-Murillo1, Jeffrey P Townsend2
1Department of Biostatistics, Yale School of Public Health, New Haven, CT, United States of America.
Mathematical biosciences
|November 23, 2023
概括
这项研究引入了一个新的马尔科夫链模型来量化癌症进化中的突变选择. 它揭示了表皮性相互作用,确定了针对肺腺癌的精密医学干预的关键途径.
科学领域:
- * 计算生物学和生物信息学
- * 癌症基因组学和进化建模
背景情况:
- * 癌症源于累积的体质突变,导致细胞不受控制地生长.
- * 了解突变相互作用 (表观) 对于绘制癌症发展轨迹至关重要.
- * 现有的方法缺乏考虑复杂的表皮性效应来量化选择强度的能力.
研究的目的:
- * 开发一种新的计算模型,用于估计癌症基因型内的突变起源和固定 (流动).
- * 量化瘤发生过程中的选择压力,包括表皮性影响.
- * 确定可行的进化轨迹和精准医学的潜在干预点.
主要方法:
- * 开发了一种连续时间马尔科夫链模型,以根据体质癌症基因型估计突变流量.
- *将马尔科夫链模型与解卷方法相结合,以估计突变率和选择.
- * 应用该模型分析了565例肺腺癌病例中的四个关键驱动基因 (TP53,LRP1B,KRAS,STK11).
主要成果:
- *确定了对抗性表皮性效应,限制了瘤性途径,为精准医学提供了目标.
- *检测到协同作用的表皮病,特别是在KRAS突变的TP53-LRP1B基因型和STK11突变的KRAS/TP53基因型中.
- * 证明KRAS变异流动是由强有力的选择驱动的,而LRP1B流动受到高突变率的影响.
结论:
- * 开发的方法准确地推断出可能的进化路线和特定地点变异的选择优势.
- *这些发现为开发个性化癌症疗法提供了对体质进化的关键见解.
- *了解表皮性相互作用是预测和潜在地预防癌症进展的关键.
相关概念视频
Cancers Originate from Somatic Mutations in a Single Cell
12.0K
Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
12.0K
Mismatch Repair
4.9K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
4.9K
Epistasis Analysis
5.0K
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
5.0K
Epigenetic Regulation
3.0K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
3.0K
Cancer-Critical Genes I: Proto-oncogenes
8.9K
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...
8.9K
Cancer-Critical Genes II: Tumor Suppressor Genes
7.4K
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...
7.4K

