منابع مشابه
Cyanobacterial tRNA(Leu)(UAA) group I introns have polyphyletic origin.
Self-splicing group I introns in tRNA anticodon loops have been found in diverse groups of bacteria (alpha, beta purple bacteria and cyanobacteria). In particular, the cyanobacterial tRNA(Leu)(UAA) group I introns have attracted considerable attention because of their presumed ancient origin and immobility. In this work, however, we identified tRNA(Leu)(UAA) group I introns in six out of 16 clo...
متن کاملSmall-subunit ribosomal RNA sequence from Naegleria gruberi supports the polyphyletic origin of amoebas.
We have sequenced the small-subunit ribosomal RNA gene of the amoebo-flagellate protozoan Naegleria gruberi. Comparison of this sequence with the rRNA sequences of other eukaryotes resulted in a phylogenetic tree that supports the suggested polyphyletic origin of amoebas and suggests a flagellate ancestry for Naegleria.
متن کاملMolecular evolution of DNA-(cytosine-N4) methyltransferases: evidence for their polyphyletic origin.
DNA N4-cytosine methyltransferases (N4mC MTases) are a family of S-adenosyl-L-methionine (AdoMet)-dependent MTases. Members of this family were previously found to share nine conserved sequence motifs, but the evolutionary basis of these similarities has never been studied in detail. We performed phylogenetic analysis of 37 known and potential new family members from the multiple sequence align...
متن کاملPolyphyletic origin of toxic Pitohui birds suggests widespread occurrence of toxicity in corvoid birds.
Pitohui birds from New Guinea have been found to contain a toxin otherwise only found in neotropical poison arrow frogs. Pitohuis have been considered to be monophyletic and thus toxicity is thought to have evolved once in birds. Here, we show that Pitohuis, rather than being a tight-knit group, are polyphyletic and represent several lineages among the corvoid families of passerine birds. This ...
متن کاملPolyphyletic origin of pyrrolizidine alkaloids within the Asteraceae. Evidence from differential tissue expression of homospermidine synthase.
The evolution of pathways within plant secondary metabolism has been studied by using the pyrrolizidine alkaloids (PAs) as a model system. PAs are constitutively produced by plants as a defense against herbivores. The occurrence of PAs is restricted to certain unrelated families within the angiosperms. Homospermidine synthase (HSS), the first specific enzyme in the biosynthesis of the necine ba...
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ژورنال
عنوان ژورنال: Food and Nutrition Sciences
سال: 2015
ISSN: 2157-944X,2157-9458
DOI: 10.4236/fns.2015.611104