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Contaminations contaminate common databases.

Staffan Bensch1, Mizue Inumaru2, Yukita Sato2

  • 1Department of Biology, MEEL, Lund University, Lund, Sweden.

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Summary
This summary is machine-generated.

Polymerase chain reaction (PCR) contamination can lead to false pathogen detections. This study examines avian haemosporidian parasite records, suggesting some may be PCR contaminations, not novel findings.

Keywords:
HaemoproteusPCR contaminationhaemosporidian parasitesplasmodiumsequence databases

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Area of Science:

  • Molecular biology
  • Parasitology
  • Ornithology

Background:

  • Polymerase chain reaction (PCR) is a sensitive molecular technique for pathogen detection.
  • The high sensitivity of PCR can lead to the amplification of artificial DNA copies, posing a contamination risk.
  • Unidentified PCR contamination can result in inaccurate conclusions regarding pathogen occurrence, host range, and geographic distribution.

Purpose of the Study:

  • To evaluate whether published records of avian haemosporidian parasites in unusual hosts or regions may be attributed to PCR contamination.
  • To identify potential sources of PCR contamination within the experimental workflow.
  • To raise awareness and aid in developing procedures to minimize PCR contamination.

Main Methods:

  • Review of published records of avian haemosporidian parasites with unusual host or geographical occurrences.
  • Analysis of case studies to identify steps in the PCR workflow that may lead to contamination.
  • Comparative evaluation of potential contamination sources versus novel biological findings.

Main Results:

  • Several published records of avian haemosporidian parasites in unusual host species or geographical regions are suspected to be artifacts of PCR contamination.
  • Specific steps in the PCR process, such as template carryover, are highlighted as potential contamination sources.
  • The findings suggest that contamination can inflate estimates of parasite host range and geographic distribution.

Conclusions:

  • PCR contamination is a significant issue that can lead to erroneous conclusions in pathogen identification.
  • Awareness of potential contamination sources is crucial for accurate molecular identification of parasites and pathogens.
  • Implementing stringent laboratory procedures is essential to minimize PCR contamination and ensure the validity of research findings.