Blar i forfatter Det helsevitenskapelige fakultet "Johansen, Steinar D."

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    • Halibut mitochondrial genomes contain extensive heteroplasmic tandem repeat arrays involved in DNA recombination 

      Johansen, Steinar D.; Mjelle, Kenneth A.; Karlsen, Bård O.; Jørgensen, Tor Erik; Moum, Truls (Journal article; Tidsskriftartikkel; Peer reviewed, 2008-01-11)
      Background: Halibuts are commercially important flatfish species confined to the North Pacific and North Atlantic Oceans. We have determined the complete mitochondrial genome sequences of four specimens each of Atlantic halibut (Hippoglossus hippoglossus), Pacific halibut (Hippoglossus stenolepis) and Greenland halibut (Reinhardtius hippoglossoides), and assessed the nucleotide variability within ...

    • A mitogenomic approach to the taxonomy of pollocks. Theragra chalcogramma and T. finnmarchica represent one single species 

      Ursvik, Anita; Breines, Ragna; Christiansen, Jørgen Schou; Fevolden, Jan-Erik; Coucheron, Dag H.; Johansen, Steinar D. (Journal article; Tidsskriftartikkel; Peer reviewed, 2007-06-07)
      Background: The walleye pollock (Theragra chalcogramma) and Norwegian pollock (T. finnmarchica) are confined to the North Pacific and North Atlantic Oceans, respectively, and considered as distinct species within the family Gadidae. We have determined the complete mtDNA nucleotide sequence of two specimens of Norwegian pollock and compared the sequences to that of 10 specimens of walleye pollock ...

    • The recent transfer of a homing endonuclease gene 

      Haugen, Peik; Wikmark, Odd-Gunnar; Vader, Anna; Coucheron, Dag H.; Sjøttem, Eva; Johansen, Steinar D. (Journal article; Tidsskriftartikkel; Peer reviewed, 2005)
      The myxomycete Didymium iridis (isolate Panama 2) contains a mobile group I intron named Dir.S956-1 after position 956 in the nuclear small subunit (SSU) rRNA gene. The intron is efficiently spread through homing by the intron-encoded homing endonuclease I-DirI. Homing endonuclease genes (HEGs) usually spread with their associated introns as a unit, but infrequently also spread independent of ...

    • Short-term sequence evolution and vertical inheritance of the Naegleria twin-ribozyme group I intron 

      Wikmark, Odd-Gunnar; De Jonckheere, Johan F.; Einvik, Christer; Johansen, Steinar D. (Journal article; Tidsskriftartikkel; Peer reviewed, 2006-05-02)
      Background Ribosomal DNA of several species of the free-living Naegleria amoeba harbors an optional group I intron within the nuclear small subunit ribosomal RNA gene. The intron (Nae.S516) has a complex organization of two ribozyme domains (NaGIR1 and NaGIR2) and a homing endonuclease gene (NaHEG). NaGIR2 is responsible for intron excision, exon ligation, and full-length intron RNA circularization, ...