DNA-Based Molecular Approaches for Parasite Identification and Characterization

Reliable identification of parasites is a cornerstone of parasitology, directly influencing diagnosis, epidemiology, taxonomy, and control measures. Traditional identification methods based on morphology and life-cycle traits are often inadequate due to cryptic species, phenotypic variation, damaged specimens, and the absence of diagnostic stages. In recent years, DNA-based molecular techniques have transformed parasite identification by offering greater accuracy and reproducibility. This chapter explains the role of DNA as a molecular tool in parasite identification and outlines the major methodological steps involved, including sample collection, DNA extraction, selection of genetic markers, polymerase chain reaction (PCR), gel electrophoresis, and DNA sequencing. Advanced approaches such as DNA barcoding, next-generation sequencing, and metabarcoding are discussed for their applications in clinical, veterinary, wildlife, and forensic parasitology. Overall, molecular identification using DNA provides sensitive and precise tools for resolving taxonomic ambiguities and enhancing modern parasitological research and diagnostics.