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Related Experiment Videos

DGGE-based detection method for Quahog Parasite Unknown (QPX).

R J Gast1, E Cushman, D M Moran

  • 1MS #32, Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA. rgast@whoi.edu

Diseases of Aquatic Organisms
|August 1, 2006
PubMed
Summary

A new polymerase chain reaction (PCR) method detects Quahog Parasite Unknown (QPX) in environmental samples and clams. This sensitive technique aids in monitoring QPX, a major cause of hard clam mortality.

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Area of Science:

  • Marine Biology
  • Aquaculture
  • Pathogen Detection

Background:

  • Quahog Parasite Unknown (QPX) causes significant hard clam (Mercenaria mercenaria) mortality in the northeastern United States.
  • QPX infections impact both wild and farmed clam populations, leading to annual losses in heavily cultivated areas.
  • Current methods for detecting subclinical QPX infections rely on histological examination of clam mantle tissue, lacking environmental monitoring capabilities.

Purpose of the Study:

  • To develop and validate a sensitive polymerase chain reaction (PCR)-based method for detecting Quahog Parasite Unknown (QPX).
  • To enable the monitoring of QPX presence in environmental samples (water, sediment) and seed clams.
  • To provide a reliable tool for early detection and management of QPX outbreaks in hard clam populations.

Main Methods:

Related Experiment Videos

  • Development of a PCR assay for QPX detection.
  • Quantification of QPX detection limits in water, sediment, and clam tissue.
  • Utilizing Denaturing Gradient Gel Electrophoresis (DGGE) to confirm PCR product identity.
  • Screening of 100 seed clams (15 mm) for QPX presence.

Main Results:

  • The PCR method can detect as few as 10-100 QPX cells per liter of water, gram of sediment, or 100 mg of clam tissue.
  • DGGE confirmed the specificity of the PCR products against control QPX cultures.
  • Screening revealed that 10-12% of the tested seed clams were positive for QPX.

Conclusions:

  • The developed PCR method offers a reliable and sensitive approach for detecting QPX in environmental samples.
  • This technique facilitates the screening of small clams and environmental matrices for QPX.
  • The method provides a crucial tool for proactive management and mitigation of QPX-related clam mortality.