转子子衍生调节元素的组织特异性限制可以保证细胞类型的身份
Danica Milovanović1, Julien Duc1, Wayo Matsushima1
1School of Life Science, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Cell reports
|January 15, 2026
概括
KRAB指蛋白 (KZFPs) 调节可转移元素 (TE) 独立于TRIM28. ZNF436通过控制TE衍生的调节元件来保护心脏细胞的身份,揭示了新的KZFP功能.
科学领域:
- 基因组学就是基因组学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
背景情况:
- 可移植元素 (TE) 显著影响哺乳动物基因组进化和基因调节.
- KRAB指蛋白 (KZFPs) 是已知的TE抑制剂,通常通过TRIM28和H3K9me3.3起作用.
- 管理特定背景的TE活动和KZFP功能的精确机制尚未完全理解.
研究的目的:
- 调查KZFPs在调节TE衍生 cis调节元件 (CREs) 中的非法定作用.
- 阐明ZNF436的功能,一个非正规的KZFP,在保持心肌细胞的身份.
- 了解KZFP如何塑造细胞类型特定的监管格局.
主要方法:
- 对KZFP结合的可转换元素进行全面的表观基因组映射.
- 专注于ZNF436在发育中的人类心脏.
- 生物化学测试以确定ZNF436与SWI/SNF重塑复合物的关联.
主要成果:
- 结合KZFP划分了古老L2/MIR元素的调节活动,独立于H3K9me3丰富.
- ZNF436通过促进心脏基因表达和限制替代血统来保持心肌细胞功能.
- ZNF436利用SWI/SNF复合体以细胞类型特定的方式限制L2/MIR衍生CREs的可访问性.
结论:
- 在塑造细胞类型特定的监管格局方面,KZFPs具有TRIM28独立的作用.
- ZNF436的机制强调了抑制替代血统程序以保持细胞身份的重要性.
- 这项研究扩展了KZFPs在基因组调节和细胞命运决定方面的已知功能.
相关概念视频
General Transcription Factors
6.7K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
6.7K
Transcription Factors
82.3K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
82.3K
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
Overview of Transposition and Recombination
18.8K
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...
18.8K
DNA-only Transposons
17.2K
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...
17.2K
Cis-regulatory Sequences
11.6K
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
11.6K


