Related Experiment Video
Updated: Apr 19, 2026
09:24
Studying Inherited Immunity in a Caenorhabditis elegans Model of Microsporidia Infection
Published on: April 6, 2022
2.9K
What helminth genomes have taught us about parasite evolution.
Magdalena Zarowiecki1, Matt Berriman1
1Parasite Genomics,Wellcome Trust Sanger Institute,Wellcome Trust Genome Campus,Hinxton,Cambridge CB10 1SA,UK.
Parasitology
|December 9, 2014
Summary
Parasitic worms, including nematodes and flatworms, have unique genome characteristics. These helminths adapt individually, lacking commonalities and focusing on surface defenses and specialized proteins for survival.
Area of Science:
- Genomics
- Parasitology
- Evolutionary Biology
Background:
- Over 20 helminth genomes have been sequenced.
- Helminths are diverse parasitic worms, including nematodes and Platyhelminthes.
- Understanding helminth genome characteristics is crucial for developing control strategies.
Purpose of the Study:
- To identify defining characteristics of helminth genomes through meta-analysis.
- To compare genomic features across different helminth groups.
- To understand the evolutionary adaptations of parasitic worms.
Main Methods:
- Meta-analysis of sequenced nematode and Platyhelminthes genomes.
- Comparative genomic analysis.
- Identification and characterization of gene families and metabolic pathways.
Main Results:
- Helminth genomes lack surface antigenic variation systems; they utilize surfaces as a primary defense.
- Expanded gene families are associated with the surface and tegument.
- Excretory/secretory products and proteases evolve rapidly and uniquely per parasite.
- Endoparasitic flatworms exhibit significant metabolic capability losses, unlike nematodes.
- All helminths show reduced auxiliary metabolism (cofactor and vitamin biogenesis).
Conclusions:
- Few common genomic features exist among independently evolved parasitic worms.
- Each helminth species displays specific adaptations tailored to its ecological niche.
- Genomic analysis reveals distinct evolutionary paths and survival strategies in helminths.
Keywords:
Nematoda
Related Concept Videos
01:22Microbial Interactions: Parasitism
89
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...
89
01:08Evolution of Microbial Genome
66
Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
66
01:15Diversity of Protists I
2.3K
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...
2.3K
01:28Fungal Phylum Microsporidia
769
Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...
769
01:24Eukaryotic Evolution
44.0K
The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
44.0K
02:16Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes
17.6K
The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
17.6K