广泛的3' UTR拼接通过多种机制调节瘤基因转录的表达
Jack J Riley1, Cristina N Alexandru-Crivac1, Sam Bryce-Smith1
1Sheffield Institute for Nucleic Acids, School of Biosciences, The University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, United Kingdom.
Nucleic acids research
|July 27, 2025
概括
在3'未翻译区域 (3' UTRs) 进行剪接是常见的,即使在癌症中也是如此. 这种3' UTR 内子拼接可以调节基因表达,避免像无意中介衰变 (NMD) 这样的降解途径.
科学领域:
- 文字转录学 (Transcriptomics) 是一个学科.
- 分子生物学分子生物学
- 癌症基因组学 癌症基因组学
背景情况:
- 在3'非翻译区域 (3' UTRs) 中的剪接通常会通过无意中介衰变 (NMD) 引发降解,这是由于外因子结合复合体 (EJC) 的存在.
- 然而,3' UTR 内体 (3UI) 在正常组织和癌症中普遍存在,这表明它们具有替代的调节作用.
研究的目的:
- 在不同类型的癌症中调查含有3UI的转录的患病率和功能.
- 确定3UI拼接是否对NMD产生敏感性或作为监管机制.
- 探索3UI拼接在癌症中的作用,特别是在信号通路方面.
主要方法:
- 从癌症基因组图谱 (TCGA) 数据 (7897个固体瘤和正常样本) 的转录组组.
- 分析含有3UI的转录表达和与NMD因子 (例如,UPF1) 的相关性.
- 识别真诚的3UIs并评估它们对NMD敏感化潜力.
- 在结肠癌中对3UI拼接的研究和用信号通路 (例如,Wnt) 进行丰富分析.
主要成果:
- 数以千计的含有3UI的转录被确定,许多在多种癌症中表达.
- 诚信的3UI并不是主要对NMD敏感,并且可以从降解中拯救转录.
- 3UI转录在癌症样本中经常存在过度拼接.
- 在结肠癌中,3UI拼接在Wnt信号通路中得到丰富,特别影响CTNNB1的表达.
结论:
- 3' UTR 拼接是一种广泛的现象,而不是罕见的事件.
- 3UI拼接为转录表达提供了监管机制,可能独立于EJC.
- 3UI拼接的失调,特别是在癌症中,影响了像Wnt这样的关键信号通路,为癌症生物学提供了新的见解.
相关概念视频
What is Gene Expression?
9.1K
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...
9.1K
Regulation of Expression at Multiple Steps
1.0K
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
1.0K
Regulation of Expression Occurs at Multiple Steps
23.4K
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
23.4K
RNA Splicing
57.1K
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...
57.1K
Alternative RNA Splicing
21.7K
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...
21.7K
Chromatin Structure Regulates pre-mRNA Processing
7.2K
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...
7.2K


