Project description:Examined expression of microRNAs in different life-cycle stages and gut tissue of the pathogenic nematode Haemonchus contortus and identified differentially expressed miRNAs. Custom array contained probes to 609 Haemonchus contortus miRNA sequence (all mature and start miRNAs identified by Winter et al., 2012, BMC Genomics13:4; DOI: 10.1186/1471-2164-13-4) and all C. elegans sequences in miRBase release 16
Project description:The Alpine goat Capra aegagrus hircus is parasitized by the barber pole worm (Haemonchus contortus). This relationship results in changes that affect the gene expression of the host, the pest, and the microbiome of both. Hematological parameters indicating genes that are expressed and/or the % Composition of abundant and diverse microbial flora are reflective of infestation. We identified responses to barber pole worms using blood-based analysis of transcripts and the microbiome. Seven (7) days post-inoculation (dpi) we identified 7,627 genes associated with different treatment types.
Project description:The excretory-secretory (ES) proteins are the molecules that actively or passively released by parasite at the parasite-host interface to maintain a physiological and immunological relationship with the host. In the present study, we characterised the excretory-secretory products from the short-term in vitro culture (i.e. within 12 h) of Haemonchus contortus (as the most important parasitic nematodes of livestock animals worldwide) using a high throughput tandem mass-spectrometry underpinned by the most recent genomic dataset. Totally, 878 unique ES proteins from three key developmental stages were identified and quantified without intracellular protein contamination (e.g. histone) typically occurred in longer term maintenance cultures. Bioinformatic analyses showed noteworthy protein excretion and secretion alterations during the transition from the free-living to the parasitic phase, especially for ES proteins which are likely involved in nutrient digestion, acquisition and parasite-host interactions, such as proteolytic cascade related peptidases, glycoside hydrolases, C-type lectins, transthyretin-like proteins and SCP/TAPS proteins. Our finding provide an avenue to better explore interactive processes between the host and this highly significant parasitic nematode, to underpin the search for novel drug and vaccine targets.
Project description:Once Haemonchus contortus infects sheep it receives a series of host attacks, especially those relating to the infected animal’s T lymphocytes immune response. To obtain a systematic genome-wide profiling of the T lymphocyte genes involved, microarrays were used to compare gene expression between 0 days post infection (dpi), 3-5 dpi, 25-30 dpi and 60dpi in infected sheep. In this 853, 242 and 42 differentially expressed genes were acquired in the 3d vs. 0d comparison, the 30d vs. 0d comparison and the 60d vs. 0d comparison, respectively. Gene Ontology and pathway analysis indicated that modulated genes including SUGT1, FCER1G, CD23, IL-13 and galectin-14, were mostly associated with cellular homeostasis maintaining and immune response. Haemonchus contortus infection induced gene expression in sheep T lymphocytes was measured at 0, 3, 30 and 60 days post infection. Four time-series experiments were performed at each sheep (2#, 3# and 5#).
Project description:Illumina sequencing of small RNAs from Brugia pahangi and Haemonchus contortus 4 samples examined, larval stage 3 and mixed sex adults from two parasitic nematode species.