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Replication in Eukaryotes02:31

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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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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences.  The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
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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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Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing
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Characterization of Eukaryotic Microbiome Using 18S Amplicon Sequencing.

Ana Popovic1,2, John Parkinson3,4

  • 1Program in Molecular Medicine, The Hospital for Sick Children, Toronto, ON, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|October 10, 2018
PubMed
Summary

This study introduces a new method for analyzing eukaryotic microbes in microbiomes using 18S rRNA gene sequencing. This approach expands our understanding of microbial diversity beyond bacteria, aiding in health and disease research.

Keywords:
18S rRNAAmplicon sequencingEukaryotic microbesIllumina MiSeqMicrobiomeTaxonomic assignment

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • High-throughput sequencing of 16S rRNA genes has advanced bacterial microbiome research.
  • Eukaryotic microbes in microbiomes, including parasites, are understudied.
  • Current methods for eukaryotic detection are limited to targeted PCR.

Purpose of the Study:

  • To present a protocol for characterizing eukaryotic microbial diversity.
  • To enable marker-based surveys for eukaryotes analogous to bacterial 16S rRNA studies.
  • To investigate the role of eukaryotic microbes in health and disease.

Main Methods:

  • Utilized amplicon sequencing of hypervariable regions of the eukaryotic 18S rRNA gene.
  • Developed a stepwise protocol for sample analysis.
  • Applied high-throughput sequencing technologies.

Main Results:

  • Successfully characterized the diversity of eukaryotic microbes in a sample.
  • Demonstrated the feasibility of using 18S rRNA gene sequencing for eukaryotic microbiome profiling.
  • Provided a foundation for broader eukaryotic microbiome studies.

Conclusions:

  • The developed protocol enables comprehensive eukaryotic microbiome analysis.
  • This method offers a powerful tool for studying eukaryotic microbes' impact on health.
  • Advances the field of microbiome research by including eukaryotic components.