Difference Between Constitutive and Inducible Expression

Thekey differencebetween constitutive and inducible expression is that组成型表达ion is the expression of a constitutive gene at a constant level while inducible expression is the expression of an inducible gene under certain conditions only.

Gene is the basic functional unit of heredity. Genes contain genetic codes to synthesize proteins. They are specific regions of chromosomes. To produce its product, a gene should undergogene expression。Gene expression takes place via two steps:转录和翻译。一些称为本构基因的基因在细胞中连续表达并合成其产物。相反，仅在有必要的情况下，仅在某些条件下表达了其他一些称为诱导基因的基因。本构表达是本构基因的基因表达，而诱导表达是诱导基因的基因表达。

内容

1.Overview and Key Difference
2.What is Constitutive Expression
3.什么是诱导表达
4.本构和诱导表达之间的相似性
5.Side by Side Comparison – Constitutive vs Inducible Expression in Tabular Form
6.概括

What is Constitutive Expression?

Constitutive gene is a gene that is expressed continuously in the cell and produces its products all the time at a constant rate. Thus, constitutive expression refers to the expression of a constitutive gene in an ongoing manner without regulation. These genes are mainly housekeeping genes involved in the processes vital for the cell function and survival of the organisms.

Glycolysis, citric acid cycle，转录和翻译是细胞中连续发生的一些过程。这些过程中涉及的酶是连续合成的，并且针对这些酶的构型Gens代码。他们始终保持“处于”状态。

什么是诱导表达?

Inducible gene is a gene expressed under certain conditions when there is a need for its products. For example, when a particular substrate is present, and it is necessary to metabolize it, inducible genes express and produce the required products to metabolize it. Thus, we call the expression of the inducible gene as inducible expression. Further, this is a regulated process.

特定调节物质（例如诱导剂或活化剂）的存在对于诱导基因表达至关重要。这种表达的专业是它仅在需要时才发生。此外，当细胞内的特定分子数量不足时，诱导基因表达发生。细菌中存在的LAC操纵子是诱导基因的一个例子。同样，基因葡萄糖激酶是人类诱导基因的一个例子。

What are the Similarities Between Constitutive and Inducible Expression?

• Constitutive gene expression and inducible gene expression are two of the three types of gene expression.
• In both types, genes undergo transcription and translation.

What is the Difference Between Constitutive and Inducible Expression?

The constitutive expression refers to the expression of constitutive genes at a constant rate in a cell regardless of the environmental conditions. In contrast, the inducible expression refers to the expression of inducible genes under certain conditions. So, this is the key difference between constitutive and inducible expression. Furthermore, the constitutive genes remain on all the time while inducible genes turn on when only needed. Therefore, this is also a difference between constitutive and inducible expression.

The below infographic summarizes the difference between constitutive and inducible expression.

概括– Constitutive vs Inducible Expression

There are three types of gene expression as constitutive, inducible and repressible. Constitutive gene expression is the constant expression of constitutive genes of a cell. In contrast, the inducible expression is the expression of inducible genes of a cell when required. So, this is the key difference between constitutive and inducible expression. Cells need the products of constitutive expression continuously while cells need the products of inducible expression on certain occasions.

Reference:

1. “Gene Expression.” Wikipedia, Wikimedia Foundation, 16 Aug. 2019,Available here。
2.“基因表达和调节”自然新闻，自然出版小组，Available here。

Image Courtesy:

1. “Gene expression” By Genomics Education Programme（CC由2.0）viaFlickr
2. “Lac operon-2010-21-01” By Lac_operon.png: G3proderivative work: Tereseik (talk) – Lac_operon.png（CC由2.0）viaCommons Wikimedia