Intestinal Transcriptomes of Nematodes: Comparison of the Parasites Ascarissuum and Haemonchuscontortus with the Free-living Caenorhabditiselegans

Yin, Yong and Martin, John and Abubucker, Sahar and Scott, Alan L. and McCarter, James P. and Wilson, Richard K. and Jasmer, Douglas P. and Mitreva, Makedonka (2008) Intestinal Transcriptomes of Nematodes: Comparison of the Parasites Ascarissuum and Haemonchuscontortus with the Free-living Caenorhabditiselegans. Plos Neglected tropical diseases ( ) - Open Access, 2 (8). pp. 1-12.

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Background: The nematode intestine is a major organ responsible for nutrient digestion and absorption; it is also involved in many other processes, such as reproduction, innate immunity, stress responses, and aging. The importance of the intestine as a target for the control of parasitic nematodes has been demonstrated. However, the lack of detailed knowledge on the molecular and cellular functions of the intestine and the level of its conservation across nematodes has impeded breakthroughs in this application.
MethodsandFindings: As part of an extensive effort to investigate various transcribed genomes from Ascaris suum and Haemonchus contortus, we generated a large collection of intestinal sequences from parasitic nematodes by identifying 3,121 A. suum and 1,755 H. contortus genes expressed in the adult intestine through the generation of expressed sequence
tags. Cross-species comparisons to the intestine of the free-living C. elegans revealed substantial diversification in the adult intestinal transcriptomes among these species, suggesting lineage- or species-specific adaptations during nematode evolution. In contrast, significant conservation of the intestinal gene repertories was also evident, despite the evolutionary
distance of ,350 million years separating them. A group of 241 intestinal protein families (IntFam-241), each containing members from all three species, was identified based on sequence similarities. These conserved proteins accounted for,20% of the sampled intestinal transcriptomes from the three nematodes and are proposed to represent conserved core
functions in the nematode intestine. Functional characterizations of the IntFam-241 suggested important roles in molecular functions such as protein kinases and proteases, and biological pathways of carbohydrate metabolism, energy metabolism, and translation. Conservation in the core protein families was further explored by extrapolating observable RNA interference phenotypes in C. elegans to their parasitic counterparts.
Conclusions: Our study has provided novel insights into the nematode intestine and lays foundations for further comparative studies on biology, parasitism, and evolution within the phylum Nematoda.

Item Type: Article
Subjects: Medical and Health Sciences > Other medical sciences
Divisions: Faculty of Medical Science
Depositing User: Marija Kalejska
Date Deposited: 30 Nov 2012 14:14
Last Modified: 30 Nov 2012 14:14

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