概括
研究人员使用Aspergillus nidulans. 在真核生物基因组中发现了第一个操作类基因组织. 这一发现揭示了对真核生物的基因调节和プロ林代谢的新见解.
科学领域:
- * 分子生物学 * 分子生物学
- * 菌群学 * 菌群学
- * 遗传学 遗传学是一门学科
背景情况:
- *真核生物基因组是复杂的,理解基因组织对于破译调节机制至关重要.
- * 在原核生物中常见的类似操作子的结构,以前在真核生物中没有明确确定.
- * Aspergillus nidulans真菌是研究真核生物基因调节的一个模型生物.
研究的目的:
- * 为了研究阿斯伯吉卢斯尼杜兰斯中proline代谢基因 (prnA和prnB) 的基因组织.
- * 确定这些基因是否形成了操作子类型的结构.
- * 为了阐明这种真核生物中碳催化剂抑制的机制.
主要方法:
- *在prnA和prnB基因群中对调控突变 (prnd) 的遗传映射.
- *基因群组织和监管区域的分析.
- *对调节突变的cis-dominance和属性的表征.
主要成果:
- * 在真核生物Aspergillus nidulans中确定了操作类组织的确切证明.
- * 鉴定了一组用于proline代谢的基因集群 (prnA和prnB),其中有一个中央调节区域.
- *在prnA和prnB之间绘制cis主导调节突变 (prnd),表明碳催化体抑制的负控制系统.
结论:
- *这项研究提供了第一个关于在真核生物基因组中运算子类型组织的明确证据.
- * 与 prokaryotic 操作子相比,这个操作子与中央调节区域的不同方向是独一无二的.
- *研究结果表明,阿斯伯吉路斯尼杜兰斯的碳催化剂抑制可能通过负控制机制运作.
更多相关视频
相关概念视频
Cis-regulatory Sequences
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...
Prokaryotic Transcriptional Activators and Repressors
The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Transcription of prokaryotic...
Combinatorial Gene Control
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...
Allosteric Proteins-ATCase
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Cis-regulatory Sequences
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...
Gene Regulation During Sporulation
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...


