Actin phylogeny and intron distribution in Bangiophyte red algae (Rhodoplantae)

Kerstin Hoef-Emden, Roshan Prakash Shrestha, Miri Lapidot, Yacob Weinstein, Michael Melkonian, Shoshana Arad

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The molecular phylogeny of red algal actin genes, with emphasis on the paraphyletic "Bangiophyceae," was examined and compared to the rhodophyte SSU rDNA phylogeny. Nineteen new genomic actin sequences and seven SSU rDNA sequences were obtained and subjected to diverse phylogenetic analyses (maximum likelihood, distance/neighbor-joining, maximum parsimony, Bayesian analyses, and, with respect to protein sequences, also quartet puzzling). The actin trees confirmed most of the major clades found in the SSU rDNA phylogenies, although with a lower resolution. An actin gene duplication in the florideophycean lineage is reported, presumably related to an increased complexity of sexual reproduction. In addition, the distribution and characteristics of spliceosomal introns found in some of the actin sequences were examined. Introns were found in almost all florideophycean actin genes, whereas only two bangiophyte sequences contained introns. One intron in the florideophycean actin genes was also found in metazoan, and, shifted by one or two nucleotides, in a glaucocystophyte, a cryptophyte, and two fungal actin genes, and thus may be an ancient intron.

Original languageEnglish
Pages (from-to)360-371
Number of pages12
JournalJournal of Molecular Evolution
Issue number3
StatePublished - 21 Jul 2005


  • Actin phylogeny
  • Bangiophyte
  • Florideophyceae
  • Gene duplication
  • Rhodoplantae
  • Spliceosomal introns

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics


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