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Related Concept Videos

Replication in Eukaryotes01:29

Replication in Eukaryotes

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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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The Origin Recognition Complex: From Origin Selection to Replication Licensing in Yeast and Humans.

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  • 1Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA.

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Summary

Yeast genetics studies reveal conserved mechanisms in DNA replication. Comparing yeast and human replication complexes using cryo-electron microscopy (cryo-EM) highlights shared strategies despite minor species-specific differences.

Keywords:
MCM hexamersMeier–Gorlin syndromecryoEM structureseukaryotic DNA replicationorigin recognition complexorigin selectionreplication initiation

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Human DNA replication mechanisms are often elucidated through studies in yeast.
  • Key replication proteins, like minichromosome maintenance (MCM) 2-7 and origin recognition complexes (ORC), were initially identified and characterized in yeast.
  • Comparative structural biology allows detailed examination of conserved and divergent aspects of replication machinery.

Purpose of the Study:

  • To compare the structural similarities and differences between yeast and human DNA replication complexes.
  • To understand the evolutionary conservation of the eukaryotic replisome.
  • To identify conserved strategies in DNA replication initiation and elongation across species.

Main Methods:

  • Forward genetics in yeast for identifying essential genes.
  • Protein purification from yeast extracts.
  • High-resolution cryo-electron microscopy (cryo-EM) for structural determination.
  • Comparative structural analysis of homologous complexes.

Main Results:

  • The minichromosome maintenance (MCM) 2-7 genes, encoding the core of the eukaryotic replisome, were identified via yeast genetics.
  • Origin recognition complexes (ORC) were purified from yeast, aiding in understanding replication origin firing.
  • Cryo-EM structures reveal high-resolution details of both yeast and human replication complexes.
  • Convergent structural data indicate shared fundamental strategies in DNA replication between yeast and humans.

Conclusions:

  • Yeast serves as a powerful model organism for understanding fundamental human DNA replication processes.
  • Comparative cryo-EM studies reveal conserved core structures and functions of the replisome.
  • Despite species-specific variations, the fundamental mechanisms of DNA replication are highly conserved in eukaryotes.