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Related Concept Videos

Genome Annotation and Assembly03:36

Genome Annotation and Assembly

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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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Genomic DNA in Prokaryotes00:46

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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
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Prokaryotic Gene Structure and Organization01:28

Prokaryotic Gene Structure and Organization

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Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...
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Translation in Prokaryotes01:29

Translation in Prokaryotes

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Prokaryote translation is a complex, highly coordinated process that converts genetic information from mRNA into functional proteins. It involves three stages: initiation, elongation, and termination, each facilitated by specific molecular components.Initiation of TranslationThe process begins with the assembly of the ribosomal subunits and initiation factors on the mRNA. In bacteria, the 30S ribosomal subunit recognizes the Shine-Dalgarno sequence in the mRNA, a conserved region upstream of...
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Prokaryotic Cells01:28

Prokaryotic Cells

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Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
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Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Related Experiment Video

Updated: Oct 15, 2025

Hybrid De Novo Genome Assembly for the Generation of Complete Genomes of Urinary Bacteria using Short- and Long-read Sequencing Technologies
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Prokaryotic Genome Annotation.

Jeffrey A Kimbrel1, Brendan M Jeffrey2, Christopher S Ward3,4

  • 1Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA, USA. kimbrel1@llnl.gov.

Methods in Molecular Biology (Clifton, N.J.)
|October 31, 2021
PubMed
Summary
This summary is machine-generated.

High-throughput sequencing has boosted prokaryotic genomics, but analyzing data can be overwhelming. This guide offers an overview of genome annotation and a protocol for new researchers to get started.

Keywords:
Functional annotationGene predictionGenome annotationProkaryote sequencingStructural annotation

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Area of Science:

  • Genomics
  • Bioinformatics
  • Microbial Systems

Background:

  • Short-read sequencing technologies have revolutionized prokaryotic genomics, increasing available genome data.
  • Numerous genome assembly and annotation tools have been developed, offering unprecedented research options.
  • Despite advancements, the complexity and variety of tools can overwhelm new researchers.

Purpose of the Study:

  • To provide an overview of prokaryotic genome annotation.
  • To highlight key considerations for genome annotation.
  • To offer a practical protocol for initiating prokaryotic genome annotation.

Main Methods:

  • Review of current genome annotation tools and their categories.
  • Discussion of requirements, caveats, and file formats for analysis tools.
  • Development of a step-by-step protocol for genome annotation.

Main Results:

  • Identification of common categories and challenges in genome annotation tools.
  • Outline of critical factors for successful genome annotation.
  • A practical, user-friendly protocol for prokaryotic genome annotation.

Conclusions:

  • Genome annotation is crucial for understanding prokaryotic genomes.
  • A structured approach and clear protocols are needed to navigate annotation tools.
  • This guide empowers researchers to confidently annotate prokaryotic genomes.