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Related Concept Videos

Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
Next-generation Sequencing03:00

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.
Mechanisms of Retrovirus-induced Cancers01:51

Mechanisms of Retrovirus-induced Cancers

Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
Mechanisms of Retrovirus-induced Cancers01:51

Mechanisms of Retrovirus-induced Cancers

Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
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...

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Related Experiment Video

Updated: May 13, 2026

Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
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XVir: A Transformer-Based Architecture for Identifying Viral Reads from Cancer Samples.

Shorya Consul1, John Robertson1, Haris Vikalo1

  • 1Chandra Family Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas, USA.

Journal of Computational Biology : a Journal of Computational Molecular Cell Biology
|May 20, 2025
PubMed
Summary
This summary is machine-generated.

A new deep learning tool, XVir, accurately detects viral DNA in human tumors. This advancement aids in understanding the 15% of cancers linked to viral infections, improving cancer research and diagnostics.

Keywords:
cancerclassificationtransformersviruses

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Area of Science:

  • Oncology
  • Virology
  • Bioinformatics
  • Computational Biology

Background:

  • Approximately 15% of global cancers are linked to viral infections, involving oncoviruses like HPV and HBV.
  • Advancements in sequencing technologies enable analysis of tumor DNA for cancer-virus associations.
  • Detecting diverse viral DNA in tumors is challenging for computational methods and machine learning models.

Purpose of the Study:

  • To introduce XVir, a novel data pipeline for reliable identification of viral DNA in human tumors.
  • To develop a robust deep learning model for detecting oncoviruses in complex genomic data.
  • To improve the computational analysis of viral contributions to cancer.

Main Methods:

  • Developed XVir, a data pipeline utilizing a transformer-based deep learning architecture.
  • Trained the model on mixed sequencing reads from viral and human genomes.
  • Evaluated performance on semi-experimental data, comparing against state-of-the-art methods.

Main Results:

  • XVir achieves high classification accuracy in detecting viral DNA in human tumors.
  • The model demonstrates robust performance across diverse viral populations and experimental settings.
  • XVir outperforms competing methods and is significantly faster to train.

Conclusions:

  • XVir offers a reliable and efficient solution for identifying oncoviral DNA in tumor samples.
  • The deep learning approach enhances the study of virus-driven cancers.
  • This tool has the potential to advance cancer diagnostics and research into viral oncogenesis.