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Circadian Rhythms and Gene Regulation02:19

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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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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...
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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.
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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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Protein sequestration versus Hill-type repression in circadian clock models.

Jae Kyoung Kim1

  • 1Department of Mathematical Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro Yuseong-gu, Daejeon, 34141, Korea. jaekkim@kaist.ac.kr.

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Circadian clocks use feedback loops for daily timekeeping. New models reveal protein sequestration offers different rhythm dynamics compared to traditional Hill-type repression, impacting clock function across species.

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Area of Science:

  • Chronobiology
  • Systems Biology
  • Molecular Biology

Background:

  • Circadian clocks are endogenous biological oscillators crucial for timekeeping.
  • These clocks rely on transcriptional-translational feedback loops for robust rhythms.
  • Mathematical modeling is essential for understanding intracellular feedback loop dynamics.

Purpose of the Study:

  • To investigate the dynamics and mechanisms of intracellular feedback loops in circadian clocks.
  • To compare new protein sequestration-based repression models with traditional Hill-type repression models.
  • To highlight the importance of accurately modeling transcriptional repression in circadian clocks.

Main Methods:

  • Review of existing mathematical models of circadian clocks.
  • Comparison of models based on Hill-type repression versus protein sequestration-based repression.
  • Analysis of theoretical and experimental studies on circadian clock mechanisms.

Main Results:

  • Protein sequestration-based repression models exhibit fundamentally different dynamics from Hill-type repression models.
  • Differences are observed in conditions for rhythm generation, network robustness, and oscillator periods.
  • Fundamental properties of circadian clocks vary among species (Neurospora, Drosophila, mammals) based on repression mechanisms.

Conclusions:

  • Accurate modeling of transcriptional repression is critical for understanding molecular circadian clocks.
  • Protein sequestration represents a distinct mechanism influencing circadian clock properties.
  • The choice of repression mechanism significantly impacts circadian clock behavior and evolution.