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Example sentences for: hgt
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It was suggested [ 3 ] that acquisition of these new functions (either by symbiosis or HGT) permitted previously free-living nematodes to expand their range into a new ecological niche (the plant) as a prelude to speciation into parasitic forms.
Similarly, the second most abundant component of cell walls (pectin) is the assumed target of nematode-encoded pectate lyase and exo-polygalacturonase, both functions also postulated to have been acquired by HGT.
A question that arises in analyzing eukaryotic sequences with strong matches to bacterial proteins, especially when the match is unique, is whether the gene in question truly was isolated from a eukaryote, or whether it represents a prokaryotic contaminant (any nucleic acid matches of ESTs to prokaryotes, which probably would be contaminants, were removed before database submission [ 28 ] ). Claims of nematode genes having been acquired by HGT [ 17 18 19 23 ] have addressed this issue in a number of ways.
The latter were assumed to be infrequently transferred, but recent analyses reported them to be horizontally transferred among bacterial lineages [ 10 11 ] . The initiation factor IF-2 in Halobacterium sp. was previously shown to have strong similarity to the initiation factor IF-2 from Bacteria [ 49 ] . Most of the genes that group Halobacterium with the mesophilic bacteria encode functions that were postulated to be frequently exchanged [ 50 ] . While no meta-category appears exempt from HGT, some functions appear to be more often transferred than others (cf.
Importantly, genes previously predicted to be the result of HGT events were identified by, and passed through, the phylogenetic filter (see below).
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