Regular ArticleEvolutionary Relationships of Trichostrongyloid Nematodes (Strongylida) Inferred from Ribosomal DNA Sequence Data
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Analysis of internal transcribed spacer1 (ITS1) region of rDNA for genetic characterization of Paramphistomum sp.: Analysis of internal transcribed spacer1 (ITS1)
2021, Saudi Journal of Biological SciencesAdaptations and phenotypic plasticity in developmental traits of Marshallagia marshalli
2019, International Journal for ParasitologyCitation Excerpt :As a general rule in Trichostrongyloidea, external nutrients (e.g. microorganisms) are essential for the survival and development of the free-living L1s and L2s, whereas the L3s may remain ensheathed, and do not feed (Durette-Desset, 1985; Durette-Desset et al., 1994). Interestingly, the pattern of development of M. marshalli, where nutrition is independent from the external environment, is shared with species from the sister superfamily Molineoidea (e.g., Nematodirus and Nematodirella spp.) (Durette-Desset et al., 1994; Chilton et al., 2001), where the development to L3 occurs within the egg and depends entirely on vitelline reserves (Boulenger, 1915). The absence of feeding of the free-living parasite stages has direct implications for strategies used to control parasite infections in livestock production systems.
Advances in the diagnosis of key gastrointestinal nematode infections of livestock, with an emphasis on small ruminants
2013, Biotechnology AdvancesCitation Excerpt :For instance, the ITS-1 region of Ostertagia ostertagi and O. lyrata (801 bp) (Zarlenga et al., 1998b) is longer than that of other trichostrongylids, including congeners, due to the presence of an internal 204 bp region, which is repeated twice (Zarlenga and Higgins, 2001; Zarlenga et al., 1998a,b). No major differences have been detected among species of Teladorsagia/Ostertagia in the lengths of their ITS-2 sequence (Chilton et al., 2001; Stevenson et al., 1996). The G + C content (39–50%) of the ITS-1 sequence of species studied is usually greater than of their ITS-2 (29–45%).
Next-Generation Molecular-Diagnostic Tools for Gastrointestinal Nematodes of Livestock, with an Emphasis on Small Ruminants. A Turning Point?
2013, Advances in ParasitologyCitation Excerpt :For instance, the ITS-1 region of the trichostrongylids Ostertagia ostertagi and Ostertagia lyrata (801 bp) (Zarlenga et al., 1998b) is longer than that of other trichostrongylids, including congeners, due to the presence of an internal 204 bp fragment, which is repeated twice (Zarlenga et al., 1998a,b, 2001). No major differences have been detected among species of Teladorsagia/Ostertagia in the lengths of their ITS-2 sequences (Chilton et al., 2001; Stevenson et al., 1996). The G + C content (39–50%) of the ITS-1 sequence of species studied is usually greater than of their ITS-2 (29–45%).
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Present address: Macfarlane Burnet Centre for Medical Research, Victoria, Australia.