在Drosophila无倍积分体中 lncRNA 和可移植元素的特征和表达
Shuai Zhang1, Ruixue Wang1, Xilin Zhu1
1Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China.
iScience
|December 21, 2023
概括
无体积症中的基因组失衡影响非编码RNA和可转移元素的程度高于mRNA. 这些非编码序列显示出独特的表达模式和功能,提供了对积体和癌症等疾病的见解.
科学领域:
- 基因组学就是基因组学.
- 发展生物学 发展生物学
- 分子生物学分子生物学
背景情况:
- 状体,一个异常的染色体数量,在全球范围内影响基因表达和生物体的健康.
- 剂量敏感的调节器在细胞网络中至关重要,而它们在动脉积症中改变的静态度会导致调节失调.
- 对非编码基因的研究,如长非编码RNA (lncRNAs) 和可转移元素 (TE),在体积的背景下仍然有限.
研究的目的:
- 为了研究lncRNAs和TEs在无体生物中的特征和表达特征.
- 为了确定 lncRNA 和 TE 是否比传递 RNA (mRNA) 更敏感于剂量效应.
- 探索剂量敏感的lncRNAs和TE在生殖组织中的功能性作用.
主要方法:
- 在体 * Drosophila * 模型中分析 lncRNA 和 TE 表达模式.
- 对 lncRNAs,TE和mRNAs之间对剂量影响的表达敏感性的比较.
- 在卵巢和丸中使用组织特异性RNA干扰 (RNAi) 调查基因功能.
主要成果:
- lncRNAs和TEs受到无体 *Drosophila* 中基因组失衡的显著影响.
- lncRNA和TE对逆剂量效应的敏感性比mRNA更强.
- 特定的剂量敏感的lncRNA和TE在胚胎发生过程中被确定具有明显的表达模式.
- 功能性研究揭示了这些非编码元素在卵巢和丸中的作用.
结论:
- 非编码序列,包括lncRNAs和TE,对积体和基因组失衡非常敏感.
- 这项研究为非编码元素在不平衡的基因组中的作用提供了新的见解.
- 这些发现为了解积体相关的人类疾病 (如癌症) 提供了新的视角.
相关概念视频
Non-LTR Retrotransposons
11.5K
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...
11.5K
LTR Retrotransposons
17.5K
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...
17.5K
Nondisjunction
3.9K
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
3.9K
piRNA - Piwi-interacting RNAs
6.9K
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...
6.9K
Overview of Transposition and Recombination
15.5K
Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
15.5K
Polytene Chromosomes
10.0K
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
10.0K


