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相关概念视频

M-Cdk Drives Transition Into Mitosis02:15

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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
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Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
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To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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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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VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma
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循环D1重新排列的扩散大B细胞淋巴瘤 - - 一个不断发展的概念.

K S Kurz1, A Zamo2, C Drewes3

  • 1Robert Bosch Krankenhaus, Department of Clinical Pathology, Stuttgart, Germany.

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概括

循环D1重组 (CCND1-R) 在扩散性大B细胞淋巴瘤 (DLBCL) 中很少见. 这项研究证实,CCND1-R可以在DLBCL中发生,有时没有其他遗传变异,这挑战了以前的分类.

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科学领域:

  • 血液学 血液学 血液学
  • 在瘤学瘤学.
  • 遗传学 是一个遗传学.

背景情况:

  • 循环D1重组 (CCND1-R) 是地幔细胞淋巴瘤 (MCL) 的决定性特征.
  • 最近的报告表明,CCND1-R可能发生在扩散性大B细胞淋巴瘤 (DLBCL) 中,这引发了诊断问题.
  • 对众多侵袭性B细胞淋巴瘤的查显示,在非MCL病例中,CCND1-R的罕见性.

研究的目的:

  • 调查DLBCL与CCND1-R.的存在和特征.
  • 为了区分这些病例与形MCL.
  • 分析DLBCL携带CCND1-R.的分子特征.

主要方法:

  • 免疫组织化学和光在位杂交 (FISH) 在15个具有CCND1-R.的大型B细胞瘤上.
  • 全基因组测序 (WGS) 和全外基因组测序 (WES).
  • 免疫球蛋白基因重组的分析 (IGHV,VDJ,CSR).

主要成果:

  • 在15个大型B细胞瘤中证实了CCND1-R,其中包括FISH的cyclin D1染色和CCND1-R.
  • 三例是CD5阳性;所有都是SOX11阴性.
  • 十个病例涉及免疫球蛋白基因重排;八个有额外的转位 (MYC,BCL2,BCL6).
  • 在14/14例中,通过WES进行突变谱分析是DLBCL的典型特征.
  • 在DLBCL中,CCND1-R可以独立于其他转位发生.

结论:

  • 不过,确实存在扩散性大B细胞淋巴瘤与循环D1重组.
  • 这些病例表现出与DLBCL一致的分子特征.
  • CCND1-R可能是DLBCL的一个孤立发现,并不总是需要额外的遗传异常.