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通过调节5'拼接地点竞争的压声器对替代拼接进行动态调节
Yang Yu1, Patricia A Maroney, John A Denker
1Center for RNA Molecular Biology, Case Western Reserve University, Cleveland, OH 44106, USA.
Cell
|December 27, 2008
概括
研究人员发现了新的序列动图,通过沉默特定的拼接部位来控制替代拼接. 这些发现增强了我们对基因表达调节和蛋白质组多样性的理解.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 替代拼接显著扩大了真核生物中的蛋白质组多样性,约70%的基因产生多个异型.
- 精确的分子机制控制拼接部位选择仍然在很大程度上未被阐明.
研究的目的:
- 通过沉默下游的拼接地点来确定可以调节拼接地点选择的序列元素.
- 调查结合部位沉默的体外和体外机制.
主要方法:
- 采用了体外随机选择方法来发现序列元素.
- 测试了已识别的图案,以测试它们沉默近端强大的5'拼接部位的能力.
- 在体内验证了发现,并研究了沉默的生物化学基础.
主要成果:
- 确定了六个新的序列动图 (两个外观,四个内观),有效地沉默近距离的5'拼接部位.
- 沉声活动取决于有竞争的上游拼接地点的存在.
- 生物化学分析表明,基因干扰U1 snRNP/5'拼接部位复合体形成,损害了拼接部位配对.
结论:
- 发现了序列动图,通过调节拼接位点选择,作为替代拼接的调节者.
- 证明了连接的非速率限制步骤中的扰动可以深刻地影响连接位置的选择.
- 提供了对控制基因表达和蛋白质组多样性的机制的新见解.
相关概念视频
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
What is Gene Expression?
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then processed and...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...

