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  • Electronic Resource  (2)
  • Key words Minicircle  (1)
  • Phylogenetic inference  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Substitutional bias confounds inference of cyanelle origins from sequence data (1992)
    Springer
    Journal of molecular evolution 34 (1992), S. 153-162 
    Details
    ISSN: 1432-1432
    Keywords: Phylogenetic inference ; Stationarity ; Substitutional Bias ; Compositional bias ; Cyanelle ; Cyanophora paradoxa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Available molecular and biochemical data offer conflicting evidence for the origin of the cyanelle of Cyanophora paradoxa. We show that the similarity of cyanelle and green chloroplast sequences is probably a result of these two lineages independently developing the same pattern of directional nucleotide change (substitutional bias). This finding suggests caution should be exercised in the interpretation of nucleotide sequence analyses that appear to favor the view of a common endosymbiont for the cyanelle and chlorophyll-b-containing chloroplasts. The data and approaches needed to resolve the issue of cyanelle origins are discussed. Our findings also have general implications for phylogenetic inference under conditions where the base compositions (compositional bias) of the sequences analyzed differ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00182392
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Minicircular plastid DNA in the dinoflagellate Amphidinium operculatum (2000)
    Springer
    Molecular genetics and genomics 263 (2000), S. 152-158 
    Details
    ISSN: 1617-4623
    Keywords: Key words Minicircle ; Dinoflagellate ; Plastid DNA ; Codon bias ; Endosymbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plastid DNA was purified from the dinoflagellate Amphidinium operculatum. The genes atpB, petD, psaA, psbA and psbB have been shown to reside on single-gene minicircles of a uniform size of 2.3–2.4 kb. The psaA and psbB genes lack conventional initiation codons in the expected positions, and may use GTA for translation initiation. There are marked biases in codon preference. The predicted PsbA protein lacks the C-terminal extension which is present in all other photosynthetic organisms except Euglena gracilis, and there are other anomalies elsewhere in the predicted amino acid sequences. The non-coding regions of the minicircles contain a “core” region which includes a number of stretches that are highly conserved across all minicircles and modular regions that are conserved within subsets of the minicircles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380050042
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    Paper (German National Licenses)
    Fulltext
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