Targeted Sequencing of Genomic Repeat Regions Detects Circulating Cell-free Echinococcus DNA

Area of Science:

• Parasitology
• Molecular Diagnostics
• Genomics

Background:

• Echinococcosis is a serious parasitic zoonosis requiring complex treatments.
• Current diagnostic methods like ultrasonography and serology often detect infection late.
• An accurate, non-invasive early diagnostic tool for echinococcosis is lacking.

Purpose of the Study:

• To develop and validate a novel molecular diagnostic method for echinococcosis.
• To detect Echinococcus DNA in patient plasma for early diagnosis.
• To establish a sensitive and specific non-invasive diagnostic approach.

Main Methods:

• Sequencing of cell-free DNA (cfDNA) from plasma of echinococcosis patients.
• Development of a targeted next-generation sequencing method focusing on repeat regions.
• Validation using simulation experiments and patient plasma samples.

Main Results:

• Echinococcus DNA was successfully detected in the cfDNA from patient plasma.
• The targeted sequencing method demonstrated high sensitivity, detecting as little as 0.1% Echinococcus genome.
• The method achieved an Area Under the Curve (AUC) of 0.862, with 62.50% sensitivity and 100% specificity.

Conclusions:

• Hydatid cysts release cfDNA fragments into patient plasma, enabling molecular detection.
• Targeted repeat region sequencing offers a highly specific method for detecting Echinococcus infection.
• This study presents a promising new avenue for non-invasive screening and diagnosis of echinococcosis.