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Related Concept Videos

Repressible Operon: trp Operon01:21

Repressible Operon: trp Operon

The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
Gene-Environment Interactions01:20

Gene-Environment Interactions

Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
Prokaryotic Transcriptional Activators and Repressors01:58

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...
Amino Acid Biosynthetic Pathways01:29

Amino Acid Biosynthetic Pathways

Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which provide...
Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...

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Related Experiment Video

Updated: Jun 1, 2026

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase
09:31

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase

Published on: September 26, 2020

Development by environment interactions controlling tryptophan hydroxylase expression.

Matthew W Hale1, Anantha Shekhar, Christopher A Lowry

  • 1Department of Integrative Physiology and Center for Neuroscience, University of Colorado Boulder, USA.

Journal of Chemical Neuroanatomy
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

Adverse early life and adult experiences impact tryptophan hydroxylase (TPH) enzyme expression. This review examines how these factors influence TPH1 and TPH2, crucial for serotonin production, particularly in the brain.

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Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET
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Related Experiment Videos

Last Updated: Jun 1, 2026

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase
09:31

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Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET
12:07

Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET

Published on: October 9, 2021

Area of Science:

  • Neuroscience
  • Biochemistry
  • Genetics

Background:

  • Tryptophan hydroxylase (TPH) is the rate-limiting enzyme in serotonin (5-hydroxytryptamine; 5-HT) biosynthesis.
  • Two isoforms, TPH1 (peripheral) and TPH2 (brain-specific), exist, encoded by separate genes.
  • TPH2 upregulation is observed in depressed suicide patients and drug-free depressed patients, suggesting a role in mood disorders.

Purpose of the Study:

  • To review the evidence linking adverse early life experiences and adult stress to TPH1 and TPH2 expression.
  • To explore the potential interactions between developmental and adult environmental factors influencing TPH expression.

Main Methods:

  • Literature review of studies investigating TPH1 and TPH2 expression.
  • Analysis of findings from rodent models and human patient studies.
  • Focus on the impact of early life adversity and adult stress.

Main Results:

  • Evidence suggests that both early life adversity and adult stress can alter TPH1 and TPH2 expression.
  • Rodent studies support the hypothesis that combined early life and adult experiences are critical for TPH2 regulation.
  • TPH2 upregulation in depression may be influenced by a combination of genetic and environmental factors.

Conclusions:

  • Early life experiences and adult stress significantly influence TPH1 and TPH2 expression.
  • Interactions between developmental and adult environmental factors play a crucial role in regulating brain serotonin pathways.
  • Understanding these influences is vital for comprehending the neurobiological underpinnings of mood disorders.