• 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 ...