'Active repressor' diaporamas de présentation

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REGULATION OF GENE EXPRESSION

REGULATION OF GENE EXPRESSION. WHY REGULATE GENE EXPRESSION??. Adaptation (Energy Conservation) Development and differentiation. GENE EXPRESSION IN DIFFERENT CELLS. Pancreatic cells. Blood cells. Muscle cell. alpha cells beta cells. WBCs RBCs.

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Chapter 18

Chapter 18. Regulation of Gene Expression. Overview: Conducting the Genetic Orchestra. Prokaryotes and eukaryotes alter gene expression in response to their changing environment

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Prokaryotic Gene Regulation

Prokaryotic Gene Regulation. Coordinate regulation of genes involved in similar functions. Types of Control. Operon. Unit of coordinate gene expression Includes structural genes and their adjacent regulatory elements We will consider Lac operon (inducible) Ara operon (inducible)

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Regulation of Gene Expression in Prokaryotes

Regulation of Gene Expression in Prokaryotes. Sections 16.1-16.8. Gene Regulation. The growth and division of bacteria are regulated by genes Constitutive Genes-genes that are always active in growing cells They are essential to the normal functioning of a growing and dividing cells.

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Controlling Gene Expression

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Operons: Bacterial Gene Control

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The Genetics of Viruses and Bacteria Gene Expression Chapter 17 and Chapter 35

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GENE REGULATION

Colorized SEM 7,000 ?. Figure 11.1A. GENE REGULATION. 0. 11.1 Proteins interacting with DNA turn prokaryotic genes on or off in response to environmental changes Early understanding of gene control Came from studies of the bacterium Escherichia coli. 0. The lac Operon

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Control of Gene Expression

Genetic Regulatory Mechanisms Dr. Jeffrey Patton Associate Professor Pathology, Microbiology, and Immunology USC-School of Medicine. Control of Gene Expression. Transcriptional control Clustering of genes with related function Coordinate control of genes with related function

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Genetic Regulatory Mechanisms

Genetic Regulatory Mechanisms. Control of Gene Expression. Transcriptional control Clustering of genes with related function Coordinate control of genes with related function Polycistronic mRNA. Inducible Genes - Operon Model.

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Operons fancy light switches

Operons fancy light switches. Ch 18. We all seek control. Think of a light switch Two purposes, on and off Sometimes we need light Advantages: have it when needed, i.e. the expression of what we want We can use this built in convenience mechanism to use things when necessary

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This metabolic control occurs on two levels

Concept 18.4: Individual bacteria respond to environmental change by regulating their gene expression E. coli , a type of bacteria that lives in the human colon Can tune its metabolism to the changing environment and food sources. (a) Regulation of enzyme activity.

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Bacterial Operons

Bacterial Operons. A model of gene expression regulation Ch 18.4. Bacteria Organize their genes into operons. Grouping genes with related functions into one transcriptional unit with a single on-off switch to control the group

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