相关实验视频
Updated: Apr 29, 2026

11:52
Analysis of LINE-1 Retrotransposition at the Single Nucleus Level
Published on: April 23, 2016
7.8K
移动间隔重复是人类基因组的主要结构变异
Cheng Ran Lisa Huang1, Anna M Schneider, Yunqi Lu
1Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
Cell
|July 7, 2010
概括
移动DNA,特别是长间隔核元素-1 (LINE-1) 逆转移子,对人类遗传多样性和疾病做出了重大贡献. 这项研究显示,这些移动遗传元素的患病率比以前估计的要高.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 人类遗传学 人类遗传学
背景情况:
- 鉴定人类基因组中的结构变异对于理解遗传多样性,遗传性疾病和瘤发生至关重要.
- 移动DNA元素的贡献,如长间隔核元素-1 (LINE-1) 逆转子对人类遗传变异和疾病的贡献,由于缺乏全面的全基因组分析,在很大程度上是推测性的.
研究的目的:
- 进行全基因组分析以检测间隔的重复,特别是人类L1(Ta) 逆转移体 (LINE-1s).
- 研究LINE-1元素在人类基因组和表型多样性中的作用.
- 探索通过微阵列 (TIP-chip) 进行转子子插入分析的实用性,以识别移动DNA多态化及其与临床表型的关联.
主要方法:
- 通过微阵列 (TIP芯片) 进行利用的转子子插入剖析,用于全基因组地图化人类L1 (Ta) 逆转子.
- 确定了新的L1{\ Ta} 插入多态,并分析了它们的等位基频率.
- 在临床队列中探索TIP芯片的应用,以确定与不同表型相关的候选单基因.
主要成果:
- 确定了许多新的人类L1(Ta) 插入多态,具有高度可变的等位基频率.
- 发现LINE-1新插入的发生率是之前估计的两倍.
- 证明了TIP芯片在识别与临床表型相关的遗传变异方面的潜力.
结论:
- 移动DNA元素,特别是LINE-1s,是人类基因组和表型多样性的重要贡献者.
- LINE-1多态性被认为是遗传变异的来源,可能在疾病中发挥作用.
- TIP芯片是扩大基因组变异目录的宝贵工具,包括其他移动元素,如Alu SINEs.
相关概念视频
Gene Conversion
9.2K
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
9.2K
Overview of Transposition and Recombination
16.3K
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...
16.3K
DNA-only Transposons
15.8K
DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
The donor site from where the transposon is excised is either degraded or...
15.8K
LTR Retrotransposons
18.0K
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...
18.0K
Non-LTR Retrotransposons
12.4K
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...
12.4K
Transposons
3.2K
Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...
3.2K

