Schistosoma mansoni genome project: an update

Area of Science:

• Genomics
• Parasitology
• Molecular Biology

Background:

• The Schistosoma mansoni genome project, initiated in 1994 by the World Health Organization, focuses on gene discovery and analysis.
• Schistosoma mansoni possesses a haploid genome of 270 Mb across 8 chromosome pairs, estimated to contain 15,000-25,000 genes.
• Over 16,000 expressed sequence tags (ESTs) are available, but more than half represent genes of unknown function, with only 20-25% of total schistosome genes discovered.

Purpose of the Study:

• To identify novel drug, vaccine, and diagnostic targets for schistosomiasis.
• To advance the understanding of the Schistosoma mansoni genome and its functional elements.
• To accelerate the development of effective schistosomiasis control and treatment strategies.

Main Methods:

• Initiation of a genome project involving gene discovery, chromosome mapping, and whole genome sequencing.
• Analysis of expressed sequence tags (ESTs) from diverse S. mansoni developmental stages.
• Genome sequencing program aiming for 3X coverage to achieve 95% gene discovery.

Main Results:

• Current EST data indicates a significant proportion of genes with unknown functions.
• Approximately 20-25% of total schistosome genes are estimated to have been discovered to date.
• Low-resolution chromosome mapping efforts are ongoing.

Conclusions:

• The genomics era provides tools for functional genomics, including microarrays and proteomics.
• Functional genomics will enable detailed study of parasite pathways, protein interactions, and metabolic pathways.
• Accelerated development of schistosomiasis interventions is anticipated through these genomic approaches.