一个特定于生殖系的小RNA类别与哺乳动物Piwi蛋白结合
Angélique Girard1, Ravi Sachidanandam, Gregory J Hannon
1Cold Spring Harbor Laboratory, Watson School of Biological Sciences, 1 Bungtown Road, Cold Spring Harbor, New York 11724, USA.
Nature
|June 6, 2006
概括
研究人员发现了Piwi相互作用RNAs (piRNAs),这是一个在丸中丰富的小RNAs的新型类别. 这些由MIWI蛋白结合的piRNAs涉及生殖线功能和生殖细胞生成.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 发展生物学 发展生物学
背景情况:
- 小RNA和阿尔戈诺特蛋白调节基因表达.
- 阿尔戈诺特蛋白质被分为阿尔戈诺特和皮维子家族.
- 皮维子家族的功能和小RNA导向器仍然是未知的.
研究的目的:
- 为了研究Piwi蛋白质的生物化学功能.
- 为了识别与Piwi子家族相关的小RNA指南.
- 在小鼠丸中描述一种新的小RNA类型.
主要方法:
- 对小鼠Piwi蛋白MIWI的生物化学分析.
- 通过MIWI结合的小RNA分子的识别和表征.
- 对已识别的小RNA进行基因组定位分析.
- 跨物种 (老鼠,人类,老鼠) 的比较分析.
主要成果:
- MIWI结合了一种新型的~29-30核酸小RNAs类,称为Piwi相互作用RNAs (piRNAs).
- piRNAs在丸中非常丰富,并且显示出特定的基因组聚类模式.
- 在人类和老鼠基因组中保存了类似的piRNA和集群位置.
- 米维突变小鼠表现出男性不育.
结论:
- piRNAs代表与Piwi亚家族相关的独特类型的小RNAs.
- 胚胎细胞中piRNAs的丰富性表明它们在生育过程中起着作用.
- 需要进一步的研究才能完全解决piRNAs的功能.
相关概念视频
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
siRNA - Small Interfering RNAs
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 ATP-dependent...
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 ATP-dependent...
piRNA - Piwi-interacting RNAs
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...
Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
Small interfering RNAs (siRNA)
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 ATP-dependent...
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 ATP-dependent...


