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Sökning: WFRF:(van Rooyen David)

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1.
  • Jiang, Rays H. Y., et al. (författare)
  • Distinctive Expansion of Potential Virulence Genes in the Genome of the Oomycete Fish Pathogen Saprolegnia parasitica
  • 2013
  • Ingår i: PLOS Genetics. - : Public Library of Science (PLoS). - 1553-7390 .- 1553-7404. ; 9:6, s. e1003272-
  • Tidskriftsartikel (refereegranskat)abstract
    • Oomycetes in the class Saprolegniomycetidae of the Eukaryotic kingdom Stramenopila have evolved as severe pathogens of amphibians, crustaceans, fish and insects, resulting in major losses in aquaculture and damage to aquatic ecosystems. We have sequenced the 63 Mb genome of the fresh water fish pathogen, Saprolegnia parasitica. Approximately 1/3 of the assembled genome exhibits loss of heterozygosity, indicating an efficient mechanism for revealing new variation. Comparison of S. parasitica with plant pathogenic oomycetes suggests that during evolution the host cellular environment has driven distinct patterns of gene expansion and loss in the genomes of plant and animal pathogens. S. parasitica possesses one of the largest repertoires of proteases (270) among eukaryotes that are deployed in waves at different points during infection as determined from RNA-Seq data. In contrast, despite being capable of living saprotrophically, parasitism has led to loss of inorganic nitrogen and sulfur assimilation pathways, strikingly similar to losses in obligate plant pathogenic oomycetes and fungi. The large gene families that are hallmarks of plant pathogenic oomycetes such as Phytophthora appear to be lacking in S. parasitica, including those encoding RXLR effectors, Crinkler's, and Necrosis Inducing-Like Proteins (NLP). S. parasitica also has a very large kinome of 543 kinases, 10% of which is induced upon infection. Moreover, S. parasitica encodes several genes typical of animals or animal-pathogens and lacking from other oomycetes, including disintegrins and galactose-binding lectins, whose expression and evolutionary origins implicate horizontal gene transfer in the evolution of animal pathogenesis in S. parasitica.
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2.
  • Morton, David, et al. (författare)
  • Social determinants of subjective well-being among young adults living in the Eastern Cape, South Africa.
  • 2018
  • Ingår i: Journal of Psychology in Africa. - : Informa UK Limited. - 1433-0237 .- 1815-5626. ; 28:4, s. 284-290
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigated the relationships between certain social determinants (age, gender, marital status, education, income, and employment) and subjective well-being (SWB) in a young adult population in the Eastern Cape Province in South Africa. The participants consisted of 977 persons aged 18 to 40 years living in the historically deprived Eastern Cape, South Africa (females = 48%; age range = 18 to 40; rural dwellers = 15%). We measured their SWB utilising the World Health Organization (Ten) Well-Being Scale. Results following analysis of variance showed that age, education, and income were predictors of SWB. Higher SWB was associated with being older, having a higher level of formal education, and having a higher level of income. However, employment status did not have a significant relationship with SWB, suggesting the relative importance of other social indicators of social functioning in this population.
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