线虫端粒酶RNA对胚胎上调基因的内基因产生影响
Yutaka Takeda1, Masahiro Onoguchi2,3, Fumiya Ito4,5
1Laboratory for Gametogenesis, RIKEN Center for Biosystems Dynamics Research (BDR), Chuo-ku, Kobe, Hyogo, Japan.
概括
研究人员发现了线虫端粒酶RNA成分 (terc-1) 作为一种独特的内基长非编码RNA (lncRNA). 这种 lncRNA 对于维护端粒和确保 Caenorhabditis elegans 的生殖不朽是必不可少的.
科学领域:
- 分子生物学
- 遗传学
- 核糖核酸生物学
背景情况:
- 端粒酶对于维持端粒长度和确保细胞不朽性至关重要.
- 端粒酶RNA组件通常被编码为独立的基因.
- RNA表达的基因组背景可以显著影响其功能.
研究的目的:
- 识别和描述Caenorhabditis elegans中的端粒酶RNA组成部分.
- 研究这种新型端粒酶RNA的生物发生和功能.
- 探索基因组背景在端粒酶RNA表达和功能中的作用.
主要方法:
- 在nmy-2基因内识别terc-1 lncRNA.
- 对terc-1拼接,多化和成熟的分析.
- 对H/ACA小核核核蛋白稳定性的评估
- 产生和分析terc-1突变.
- 通过人工移植对内基序列的功能分析.
主要成果:
- 凯诺拉布迪斯的端粒酶RNA成分 (terc-1) 是一个嵌入在生殖线上调节的nmy-2基因中的内基长非编码RNA (lncRNA).
- terc-1利用H/ACA小核RNA生物发生机制进行成熟和稳定.
- 在terc-1中发生的突变导致了代际渐进的端粒缩短和不育.
- 基因组上下文至关重要,因为内置移植只能在基因表达基因中恢复生殖不朽.
结论:
- 线虫端粒酶RNA是一种snoRNA类的内基 lncRNA.
- 胚胎上调基因内terc-1的表达对其功能至关重要.
- 这种机制通过采用现有的生物生成途径和特定的基因组背景来确保生殖不朽性和物种生存.
更多相关视频
10:01Observation and Quantification of Telomere and Repetitive Sequences Using Fluorescence In Situ Hybridization FISH with PNA Probes in Caenorhabditis elegans
Published on: August 4, 2016
10.9K
11:24Estimation of Telomeric Repeat-containing RNA from DNA/RNA Hybrid Complexes
Published on: December 5, 2025
168
相关概念视频
Telomeres and Telomerase
26.8K
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
26.8K
Telomeres and Telomerase
7.0K
7.0K
Non-LTR Retrotransposons
13.2K
As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
13.2K
LTR Retrotransposons
19.4K
LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
19.4K
piRNA - Piwi-interacting RNAs
7.5K
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...
7.5K
Replication in Eukaryotes
17.0K
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
17.0K
