title: Evidence for multiple lateral transfers of the circadian clock cluster in filamentous heterocystic cyanobacteria Nostocaceae.
abstract: Cyanobacteria are the first prokaryotes reported to show circadian rhythmicity, which is regulated by a cluster of three genes: kaiA, kaiB, and kaiC. Phylogenetic analysis of the kaiBC cluster in filamentous cyanobacteria of the family Nostocaceae including Nodularia spumigena and Nostoc linckia from Arubotaim Cave, Mt. Sedom, Israel, indicated that this cluster has experienced multiple lateral transfers. The transfers have occurred in different periods of the species' evolution. The data obtained suggest that lateral transfers of the circadian clock cluster in filamentous cyanobacteria have been common and might have adaptive significance.
authors.affiliation: Institute of Evolution, University of Haifa, Mount Carmel, 31905 Haifa, Israel. dvornyk@creighton.edu
authors.forename: Volodymyr
authors.initials: V
authors.lastname: Dvornyk
authors.forename: Eviatar
authors.initials: E
authors.lastname: Nevo
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D001683:Biological Clocks / Q000235:genetics*; D002940:Circadian Rhythm / Q000235:genetics*; D056925:Circadian Rhythm Signaling Peptides and Proteins; D000458:Cyanobacteria / Q000235:genetics*; D017931:DNA Primers; D019143:Evolution, Molecular; D022761:Gene Transfer, Horizontal / Q000235:genetics*; D007557:Israel; D016013:Likelihood Functions; D008957:Models, Genetic; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013997:Time Factors
chemical_list: D001426:Bacterial Proteins; D056925:Circadian Rhythm Signaling Peptides and Proteins; D017931:DNA Primers; C114270:KaiB protein, cyanobacteria; C114271:KaiC protein, cyanobacteria; D012336:RNA, Ribosomal, 16S