一个合成的,闭环基因电路,用于在体生成过程中自主调节RUNX2活性
Gurcharan Kaur1, Biming Wu1, Sanjana Murali2
1Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA.
概括
设计了一种基因电路来控制RUNX2活动,增强软骨矩阵合成并防止组织工程中的降解. 这种RUNX2抑制策略对治疗退行性关节疾病充满希望.
科学领域:
- 生物技术是生物技术.
- 分子生物学分子生物学
- 组织工程是组织工程.
背景情况:
- RUNX2对于冠状细胞的发育和成熟至关重要.
- 不良的冠状细胞成熟在软骨组织工程中带来了挑战.
- 准RUNX2为软骨修复提供了一个潜在的策略.
研究的目的:
- 为了设计一个自我调节的基因电路来控制RUNX2活性在chondrogenic细胞.
- 研究RUNX2抑制对软骨矩阵积累和稳定性的影响.
- 评估这个基因电路在人类中干细胞衍生的软骨中的治疗潜力.
主要方法:
- 设计和制造了一种合成基因电路 (cisCXp-shRunx2),通过RNA干扰来诱导RUNX2沉默.
- 使用可调节的合成Col10a1-like促进剂 (cisCXp) 调节基因电路活动.
- 评估了基因电路在ATDC5细胞和人类介质干细胞衍生的软骨模型中的有效性.
主要成果:
- cisCXp-shRunx2基因电路有效地使RUNX2在成熟的红细胞中沉默,而不会影响早期的红细胞生成.
- 诱导的RUNX2损失增强了软骨矩阵的积累,并抵抗了细胞外矩阵的降解.
- 基因电路的有效性可以通过修改cisCXp促进器灵敏度来调整.
- 在炎症条件下,RUNX2抑制可以防止hMSC衍生的软骨的矩阵损失.
结论:
- 自主调节基因电路有效调节RUNX2活性,以增强软骨矩阵合成.
- 这种方法显示出在退行性关节条件下防止矩阵降解的潜力.
- 有针对性的RUNX2抑制为软骨组织工程和再生医学提供了一种新的策略.
相关概念视频
Master Transcription Regulators
6.9K
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
6.9K
Combinatorial Gene Control
8.3K
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
8.3K
Epigenetic Regulation
3.0K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
3.0K
TGF - β Signaling Pathway
7.4K
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
7.4K
Inheritance of Chromatin Structures
6.2K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.2K
Regulation of Expression at Multiple Steps
907
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
907


