人体内源性逆转录病毒的现状注释
Sergei Sinitsyn1, Marharyta Klianitskaya2, Michelle Vincendeau3,4
1Department of Bioinformatics, TUM School of Life Sciences, Technical University of Munich, 85354 Freising, Germany.
Briefings in bioinformatics
|February 16, 2026
概括
人体内源逆转录病毒 (HERVs) 的注释在数据库中各不相同. 这项研究协调了高达93%的HERV记录,突出了互补的优势和需要标准化的目录.
科学领域:
- 基因组学就是基因组学.
- 生物信息学是一种生物信息学.
- 分子生物学分子生物学
背景情况:
- 人体内源逆转录病毒 (HERVs) 是人类基因组的组成部分,影响生理和病理过程.
- 在公共数据库中对HERV元素的注释不一致,阻碍了研究.
- 准确的HERV目录对于理解它们的生物学作用至关重要.
研究的目的:
- 为了对主要的HERV注释资源进行比较分析:DFAM,HERVd和RepBase.
- 评估这些数据库中HERV注释的一致性和差异.
- 为研究中有效利用HERV资源提供建议.
主要方法:
- 系统检查HERV数据库内容,分类和后处理工作流程.
- 对HERV元素注释的基因组坐标进行比较分析.
- 开发精细的匹配标准,以便在数据库中协调HERV记录.
主要成果:
- 在元素计数,基因组覆盖和碎片化策略方面发现了实质性的差异,这是由于不同的策划方法造成的.
- 最多93%的HERV记录可以在DFAM,HERVd和RepBase中使用精细的标准进行协调.
- 每个数据库都贡献了独特的HERV元素,强调了它们的互补价值.
结论:
- HERV注释资源表现出显著的变化,影响研究的一致性.
- 关于反向元素注释的协调标准对于全面的HERV目录化至关重要.
- 该研究为利用HERV数据库的研究人员提供了实际指导,并为未来的编目工作提供了信息,包括T2T-CHM13等新基因组组件的新基因组.
相关概念视频
Non-LTR Retrotransposons
13.5K
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...
13.5K
LTR Retrotransposons
19.8K
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...
19.8K
Retroviruses
15.0K
Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
15.0K
Retrovirus Life Cycles
49.8K
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
49.8K
Leaky Scanning
5.7K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.7K
RNA Editing
9.9K
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...
9.9K


