全球对Caenorhabditis elegans的综合分析
Thomas Blumenthal1, Donald Evans, Christopher D Link
1Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Box B121, 4200 E. 9th Avenue, Denver, Colorado 80262, USA. tom.blumenthal@uchsc.edu
Nature
|June 21, 2002
概括
线虫Caenorhabditis elegans至少有1000个操作子,这些操作子是一起转录的基因集群. 这一发现揭示了新的功能关系,并扩大了我们对这种模型生物体中基因调节的理解.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- 在动物中,操作子是罕见的,Caenorhabditis elegans是一个显著的例外.
- 操作子涉及多基斯特龙转录,然后通过转接处理将其加工成单基斯特龙mRNA.
- 之前在C. elegans中对操作子的鉴定是有限的,这阻碍了对它们的流行和功能的充分理解.
研究的目的:
- 系统地识别和量化Caenorhabditis elegans基因组中的操作子.
- 为了确定下游操作子基因中SL2转链剪接的程度.
- 探索共同转录的基因之间的潜在功能关系.
主要方法:
- 全基因组微阵列分析以检测含有SL2的mRNA.
- 基因集群和基因组安排的生物信息分析.
- 与现有的补充DNA序列数据进行比较.
主要成果:
- 鉴定了大约1200个用于SL2转接的基因.
- 基因组分析证实90%以上的基因是下游操作基因,分为790个不同的操作基因.
- 在C. elegans基因组中估计至少有1000个操作子,占所有基因的15%左右.
结论:
- 在C. elegans基因组中,操作子的数量比以前所知的数量要大得多.
- 在操作子内,功能相关基因的共同转录是常见的,这表明了协调的基因调节.
- 已识别的操作子为发现新的功能基因关系提供了资源.
相关概念视频
Operons
Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
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...
Operons
Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
Operon Model
The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
Inducible Operons: lac Operon
The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside...
Global Regulatory Systems
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...


