RRC ID 38016
Author Kamikawa R, Masuda I, Demura M, Oyama K, Yoshimatsu S, Kawachi M, Sako Y.
Title Mitochondrial group II introns in the raphidophycean flagellate Chattonella spp. suggest a diatom-to-Chattonella lateral group II intron transfer.
Journal Protist
Abstract In the cytochrome c oxidase subunit I (cox1) gene of four raphidophycean flagellates Chattonella antiqua, C. marina, C. ovata, and C. minima we found two group II introns described here as Chattonella cox1-i1 and Chattonella cox1-i2 encoding an open reading frame (ORF) comprised of three domains: reverse transcriptase (RT), RNA maturase (Ma) and zinc finger (H-N-H) endonuclease domains. The secondary structures show both Chattonella cox1-i1 and Chattonella cox1-i2 belong to group IIA1, albeit the former possesses a group IIB-like secondary structural character in the epsilon' region of arm I. Our phylogenetic analysis inferred from RT domain sequences of the intronic ORF, comparison of the insertion sites, and the secondary structures of the introns suggests that Chattonella cox1-i1 likely shares an evolutionary origin with the group II introns inserted in cox1 genes of five phylogenetically diverged eukaryotes. In contrast, Chattonella cox1-i2 was suggested to bear a close evolutionary affinity to the group II introns found in diatom cox1 genes. The RT domain-based phylogeny shows a tree topology in which Chattonella cox1-i2 is nested in the diatom sequences suggesting that a diatom-to-Chattonella intron transfer has taken place. Finally, we found no intron in cox1 genes from deeper-branching raphidophyceans. Based on parsimonious discussion, Chattonella cox1-i1 and Chattonella cox1-i2 have invaded into the cox1 gene of an ancestral Chattonella cell after diverging from C. subsalsa.
Volume 160(3)
Pages 364-75
Published 2009-8-1
DOI 10.1016/j.protis.2009.02.003
PII S1434-4610(09)00011-X
PMID 19346162
MeSH Animals DNA, Mitochondrial / chemistry DNA, Mitochondrial / genetics* DNA, Protozoan / chemistry DNA, Protozoan / genetics Diatoms / genetics* Electron Transport Complex IV / genetics* Eukaryota / genetics* Evolution, Molecular Gene Transfer, Horizontal* Introns* Molecular Sequence Data Nucleic Acid Conformation Phylogeny Protein Structure, Tertiary Protozoan Proteins / genetics Sequence Analysis, DNA Sequence Homology, Nucleic Acid
IF 1.989
Times Cited 9
Algae NIES-1 NIES-2 NIES-3 NIES-14 NIES-85 NIES-86 NIES-115 NIES-118 NIES-121 NIES-161 NIES-462 NIES-557 NIES-558 NIES-603 NIES-671 NIES-716 NIES-849 NIES-1303 NIES-1975 NIES-1976 NIES-2391 NIES-2401 NIES-2402 NIES-2403 NIES-2404