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相关概念视频

MicroRNAs01:22

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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Mismatch Repair01:20

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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...
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Mutations in Microorganisms01:18

Mutations in Microorganisms

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Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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Abnormal Proliferation02:23

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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...
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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
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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.
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身体突变效应在微RNA失调上扩散.

Hui Yu1, Limin Jiang1, Chung-I Li2

  • 1Department of Public Health, Sylvester Comprehensive Cancer Center, University of Miami, Miami, FL 33136, U.S.A.

Bioinformatics (Oxford, England)
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此摘要是机器生成的。

身体突变影响微RNAs (miRNAs),影响细胞过程和疾病预后. 一个新的统计框架严格评估了对miRNAs的突变效应,确定了泛癌分析中的显著影响和预后价值.

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科学领域:

  • 基因组学就是基因组学.
  • 文字转录学 (Transcriptomics) 是一个学科.
  • 癌症生物学 癌症生物学

背景情况:

  • 微RNAs (miRNAs) 是基因表达的关键调节者,在疾病中发挥作用.
  • 身体突变可以影响miRNA调节,影响细胞过程和疾病结果.
  • 之前的研究往往缺乏强大的统计方法来解释诸如不平等的样本大小和阶级不平衡等偏差,当将突变与基因表达相关联时.

研究的目的:

  • 开发和应用一个严格的统计框架来评估体质突变对微RNA的影响.
  • 识别突变对miRNAs产生影响的基因,这些基因在癌症中也具有预后价值.

主要方法:

  • 开发了一个使用基于变的零分布的统计框架,以评估对miRNAs的突变影响.
  • 将框架应用于胰腺癌数据集.
  • 包含了高级功能,如miRNA异型分析,聚合性预后分析和详细的注释.

主要成果:

  • 确定了9008个蛋白质编码基因,对miRNAs产生了统计学上显著的突变影响.
  • 发现83个基因的集体miRNA表达在9种癌症类型中显示出显著的预后能力.
  • 在低度质瘤中,与特定基因突变相关的miRNA表达的预后价值已被证明.

结论:

  • 开发的统计框架有效地识别了对具有预后意义的miRNAs的突变影响.
  • 这种方法提供了一个强大的方法来分析体质突变,miRNA调节和癌症预后之间的复杂相互作用.
  • 这些发现突出了特定的基因及其相关的miRNA表达特征作为癌症预后的潜在生物标志物.