Related Experiment Video
Updated: May 11, 2026
06:23
Leveraging Micro-CT Scanning to Analyze Parasitic Plant-Host Interactions
Published on: January 12, 2022
Clarifying Prehistoric Parasitism from a Complementary Morphological and Molecular Approach.
Lauren M Cleeland1, Mason V Reichard, Raul Y Tito
1University of Oklahoma, Department of Anthropology, 455 West Lindsey, Dale Hall Tower 521, Norman, OK 73019.
Journal of Archaeological Science
|May 7, 2013
Summary
This study introduces a combined morphological and molecular method for identifying ancient parasitic infections. This approach accurately identified *Physaloptera* in a 1,400-year-old fecal sample, resolving previous diagnostic ambiguities.
Area of Science:
- Paleoparasitology
- Molecular biology
- Archaeology
Background:
- Accurate identification of ancient parasites is crucial for understanding past human health and environments.
- Traditional morphological methods for parasite identification have limitations, especially with similar-looking genera.
- Molecular techniques offer higher specificity but can be challenging to apply to ancient samples.
Purpose of the Study:
- To develop and validate an integrated approach combining morphological and molecular methods for identifying prehistoric parasitic infections.
- To demonstrate the efficacy of this integrated approach through a case study of a 1,400-year-old fecal sample.
- To resolve ambiguities in the identification of *Physaloptera* parasites in archaeological contexts.
Main Methods:
- Morphological analysis of parasite specimens from a desiccated fecal sample.
- DNA extraction directly from prepared microscope slides.
- Polymerase chain reaction (PCR) amplification and sequencing of the 18S ribosomal RNA gene.
- Phylogenetic analysis to determine parasite identity.
- Confirmation through rehydration and analysis of original coprolite material.
Main Results:
- Initial morphological analysis tentatively identified ascarids.
- Molecular analysis revealed the parasite belonged to the *Physaloptera* genus, not ascarids.
- A phylogenetic anomaly initially suggested *Contracaecum spiculigerum*, later identified as a database error.
- Confirmation of *Physaloptera* identification through repeated molecular analyses.
Conclusions:
- The integrated morphological and molecular approach effectively resolves taxonomic ambiguities in paleoparasitology.
- *Physaloptera* infections may be underreported in both ancient and modern populations due to morphological similarities with ascarids.
- This combined methodology enhances the accuracy of identifying prehistoric parasitic diseases and their impact on human populations.
Related Concept Videos
01:22Microbial Interactions: Parasitism
Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
01:15Diversity of Protists I
Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
01:23Phylogeny
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
02:54Evolutionary Relationships through Genome Comparisons
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
01:27Diversity of Protists III
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
01:28Microbial Phylogeny
Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...