相关实验视频
Updated: Jul 31, 2026

07:42
Dissection of Hippocampal Dentate Gyrus from Adult Mouse
Published on: November 18, 2009
概括
对于中枢神经系统髓来说至关重要的老鼠大脑蛋白质脂质蛋白 (PLP) mRNA 呈现差异,但对哺乳动物中高度保存的相同蛋白质进行编码. 1600核酸mRNA可能在功能上不必要.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 蛋白脂蛋白 (PLP) 是中枢神经系统中主要的蛋白质.
- PLP是由单个基因编码的,在髓结构和功能中起着关键作用.
研究的目的:
- 为了研究大鼠大脑PLPmRNAs的异质性.
- 为了比较蛋白质产品和PLP的进化保存.
- 评估不同PLP mRNA变异的功能必要性.
主要方法:
- 分析老鼠大脑mRNA序列 (3200和1600个核酸).
- 鼠和牛的PLP之间的氨基酸序列比较.
- 在小鼠和子中对PLP mRNA使用的比较分析.
主要成果:
- 鼠的大脑表现出两种不同的PLP mRNA变体 (3200和1600核酸),具有不同的5'末端和3'多基化位点.
- 这两种mRNA变异都编码了相同的277个氨基酸蛋白质,显示了牛PLP的99%相同性,这表明保存率很高.
- 氨基末端氨酸的翻译后去除表明,不需要信号来插入膜.
- 鼠和主要使用较大的 (3200核酸) mRNA,这意味着较小的变异可能不必.
结论:
- 鼠的大脑PLP mRNA表现出显著的异质性,但却产生一种高度保存的蛋白质,对髓至关重要.
- 高度的保护表明PLP在哺乳动物进化过程中发挥了关键的功能作用.
- 跨物种的PLP mRNA变体的差异性使用表明潜在的冗余或特定物种的功能要求.
相关概念视频
The Central Dogma
Overview
From DNA to Protein
The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
RNA Editing
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
The Central Dogma
The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...

