相关实验视频
Updated: Jul 19, 2025

08:25
Identification of Circular RNAs using RNA Sequencing
Published on: November 14, 2019
12.3K
圆形RNA的黑暗面,这是基因组不稳定的新驱动力
Ajit Kumar Sharma1, Anish Thomas1
1Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA.
Cell chemical biology
|August 18, 2023
概括
循环RNAs (circRNAs) 可以形成DNA杂交,驱动MLL/KMT2A中的遗传重组. 这一发现揭示了侵袭性急性白血病和新的治疗点.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 癌症研究 癌症研究
背景情况:
- 循环RNAs (circRNAs) 是一种具有独特的共价封闭结构的RNA分子类.
- 环RNAs的生物功能在很大程度上仍未被探索.
- 涉及MLL/KMT2A的特定遗传重组是侵袭性急性白血病的标志.
研究的目的:
- 为了研究circRNAs在癌症中的功能作用.
- 探索circRNAs和DNA之间的相互作用.
- 阐明导致MLL/KMT2A在急性白血病中的遗传重组的机制.
主要方法:
- 对circRNA-DNA相互作用的分析.
- 调查circRNA与相似的DNA位置结合的情况.
- 在MLL/KMT2A.中评估circRNA介导的遗传重组.
主要成果:
- 证明circRNAs可以与特定的DNA序列结合,形成称为"circR循环"的circRNA-DNA杂交.
- 展示了这些circR循环负责诱导MLL/KMT2A基因位点的遗传重组.
- 建立了circRNA活性和侵袭性急性白血病的发展之间的直接联系.
结论:
- 循环RNAs在驱动致癌性遗传重组中发挥着直接作用.
- 形成circRNA-DNA杂交 (circR循环) 是一种新的机制,有助于MLL/KMT2A驱动的白血病发生.
- 这些发现为了解和潜在地针对攻击性急性白血病开辟了新的途径.
相关概念视频
piRNA - Piwi-interacting RNAs
6.9K
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...
6.9K
RNA Stability
33.6K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
33.6K
DNA Damage can Stall the Cell Cycle
9.2K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.2K
lncRNA - Long Non-coding RNAs
8.6K
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
8.6K
siRNA - Small Interfering RNAs
16.8K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
16.8K
Epigenetic Regulation
3.1K
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...
3.1K

