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Human Contamination in Public Genome Assemblies.

Kirill Kryukov1, Tadashi Imanishi1

  • 1Department of Molecular Life Science, School of Medicine, Tokai University, Isehara, Kanagawa, Japan.

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PubMed
Summary
This summary is machine-generated.

Human DNA contamination is a common issue in genome assemblies, potentially leading to inaccurate results. This study found 154 contaminated genome assemblies, with many human sequences present for over a decade.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Molecular Biology

Background:

  • Genome assembly accuracy is crucial for downstream applications like sequence comparison.
  • Bacterial contamination in genome assemblies is recognized, but human contamination is less studied.
  • Human DNA contamination can lead to erroneous biological interpretations and flawed reference genomes.

Purpose of the Study:

  • To investigate the prevalence and characteristics of human DNA contamination in publicly available genome assemblies.
  • To differentiate between true conserved human sequences and contaminating human DNA fragments.
  • To provide recommendations for mitigating human contamination in future genome assembly projects.

Main Methods:

  • Surveyed 45,735 bacterial and other non-human genome assemblies.
  • Employed lineage specificity to distinguish human contamination from conserved sequences.
  • Utilized computational analysis to identify human DNA fragments within non-human genomes.

Main Results:

  • Identified 154 genome assemblies containing high-confidence human DNA contamination.
  • Found that a majority of the contaminating human sequences had been present in reference assemblies for over 10 years.
  • Highlighted the persistence of human DNA contamination in public genomic databases.

Conclusions:

  • Human DNA contamination is a significant and often overlooked issue in genome assembly.
  • Existing contaminated genome assemblies require revision to remove erroneous human sequences.
  • Future genome assemblies must undergo rigorous checks for human DNA contamination before public submission to ensure data integrity.