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Related Concept Videos

Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
Nucleic Acid Structure01:25

Nucleic Acid Structure

The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
DNA-only Transposons02:57

DNA-only Transposons

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
Non-LTR Retrotransposons03:18

Non-LTR Retrotransposons

As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...

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Related Experiment Video

Updated: May 9, 2026

Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses
12:20

Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses

Published on: December 29, 2015

Junonia coenia Densovirus (JcDNV) Genome Structure.

Hanh T Pham1, Oanh T H Huynh, Françoise-Xavière Jousset

  • 1INRS-Institut Armand-Frappier, Laval, QC, Canada.

Genome Announcements
|August 10, 2013
PubMed
Summary
This summary is machine-generated.

The first published Junonia coenia densovirus genome sequence was inaccurate. New sequencing confirmed its close relationship to other densoviruses, correcting previous errors.

More Related Videos

Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
08:56

Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes

Published on: July 27, 2018

Related Experiment Videos

Last Updated: May 9, 2026

Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses
12:20

Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses

Published on: December 29, 2015

Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
08:56

Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes

Published on: July 27, 2018

Area of Science:

  • Virology
  • Molecular Biology
  • Genomics

Background:

  • The initial genome sequence of Junonia coenia densovirus, the first published densovirus genome, contained errors.
  • These errors included incomplete inverted terminal repeats and ambiguous nucleotides/indels.
  • This led to an inaccurate map of the virus's open reading frames.

Purpose of the Study:

  • To re-sequence and accurately characterize the complete genome of Junonia coenia densovirus.
  • To correct the previously published genome sequence and open reading frame map.
  • To clarify the phylogenetic position of Junonia coenia densovirus within the Densovirus genus.

Main Methods:

  • Whole genome sequencing of cloned Junonia coenia densovirus DNA.
  • Bioinformatic analysis to assemble the genome sequence.
  • Comparative genomic analysis with other densoviruses.

Main Results:

  • A complete and accurate genome sequence for Junonia coenia densovirus was determined.
  • The corrected sequence resolved issues with inverted terminal repeats and ambiguous nucleotides.
  • Phylogenetic analysis revealed Junonia coenia densovirus is closely related to other viruses in the Densovirus genus.

Conclusions:

  • The corrected Junonia coenia densovirus genome sequence provides a reliable basis for future research.
  • This study refines our understanding of densovirus genome structure and evolution.
  • The findings support the close evolutionary relationship between Junonia coenia densovirus and its relatives.