Abstract:
BACKGROUND:Cyanobacteria are one of the oldest and morphologically most diverse prokaryotic phyla on our planet. The early development of an oxygen-containing atmosphere approximately 2.45-2.22 billion years ago is attributed to the photosynthetic activity of cyanobacteria. Furthermore, they are one of the few prokaryotic phyla where multicellularity has evolved. Understanding when and how multicellularity evolved in these ancient organisms would provide fundamental information on the early history of life and further our knowledge of complex life forms. RESULTS:We conducted and compared phylogenetic analyses of 16S rDNA sequences from a large sample of taxa representing the morphological and genetic diversity of cyanobacteria. We reconstructed ancestral character states on 10,000 phylogenetic trees. The results suggest that the majority of extant cyanobacteria descend from multicellular ancestors. Reversals to unicellularity occurred at least 5 times. Multicellularity was established again at least once within a single-celled clade. Comparison to the fossil record supports an early origin of multicellularity, possibly as early as the "Great Oxygenation Event" that occurred 2.45-2.22 billion years ago. CONCLUSIONS:The results indicate that a multicellular morphotype evolved early in the cyanobacterial lineage and was regained at least once after a previous loss. Most of the morphological diversity exhibited in cyanobacteria today--including the majority of single-celled species--arose from ancient multicellular lineages. Multicellularity could have conferred a considerable advantage for exploring new niches and hence facilitated the diversification of new lineages.
journal_name
BMC Evol Bioljournal_title
BMC evolutionary biologyauthors
Schirrmeister BE,Antonelli A,Bagheri HCdoi
10.1186/1471-2148-11-45subject
Has Abstractpub_date
2011-02-14 00:00:00pages
45issn
1471-2148pii
1471-2148-11-45journal_volume
11pub_type
杂志文章abstract:BACKGROUND:The TRIM family is composed of multi-domain proteins that display the Tripartite Motif (RING, B-box and Coiled-coil) that can be associated with a C-terminal domain. TRIM genes are involved in ubiquitylation and are implicated in a variety of human pathologies, from Mendelian inherited disorders to cancer, a...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-8-225
更新日期:2008-08-01 00:00:00
abstract:BACKGROUND:Orb-web weaving spiders and their relatives use multiple types of task-specific silks. The majority of spider silk studies have focused on the ultra-tough dragline silk synthesized in major ampullate glands, but other silk types have impressive material properties. For instance, minor ampullate silks of orb-...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-017-0927-x
更新日期:2017-03-14 00:00:00
abstract:BACKGROUND:Hemerythrins, are the non-heme, diiron binding respiratory proteins of brachiopods, priapulids and sipunculans; they are also found in annelids and bacteria, where their functions have not been fully elucidated. RESULTS:A search for putative Hrs in the genomes of 43 archaea, 444 bacteria and 135 eukaryotes,...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-8-244
更新日期:2008-09-02 00:00:00
abstract:BACKGROUND:Symbioses between invertebrates and prokaryotes are biological systems of particular interest in order to study the evolution of mutualism. The symbioses between the entomopathogenic nematodes Steinernema and their bacterial symbiont Xenorhabdus are very tractable model systems. Previous studies demonstrated...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-6-68
更新日期:2006-09-05 00:00:00
abstract:BACKGROUND:The gene for odontogenic ameloblast-associated (ODAM) is a member of the secretory calcium-binding phosphoprotein gene family. ODAM is primarily expressed in dental tissues including the enamel organ and the junctional epithelium, and may also have pleiotropic functions that are unrelated to teeth. Here, we ...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-019-1359-6
更新日期:2019-01-23 00:00:00
abstract:BACKGROUND:Our laboratory identified ADGRL4/ELTD1, an orphan GPCR belonging to the adhesion GPCR (aGPCR) family, as a novel regulator of angiogenesis and a potential anti-cancer therapeutic target. Little is known about how ADGRL4/ELTD1 (and aGPCRs in general) function, a problem compounded by a lack of known ligands o...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-019-1445-9
更新日期:2019-07-12 00:00:00
abstract:BACKGROUND:The seacoasts of the Japanese Arc are fringed by many gravel beaches owing to active tectonic uplift and intense denudation caused by heavy rainfall. These gravel beaches are inhabited by gobies of the genus Luciogobius that burrow into the gravel sediment and live interstitially. Although their habitat and ...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-9-145
更新日期:2009-06-28 00:00:00
abstract:BACKGROUND:Patterns of genetic diversity between and within natural plant populations and their driving forces are of great interest in evolutionary biology. However, few studies have been performed on the genetic structure and population divergence in wild emmer wheat using a large number of EST-related single nucleot...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-13-169
更新日期:2013-08-13 00:00:00
abstract:BACKGROUND:The existence of "ancient asexuals", taxa that have persisted for long periods of evolutionary history without sexual recombination, is both controversial and important for our understanding of the evolution and maintenance of sexual reproduction. A lack of sex has consequences not only for the ecology of th...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-8-194
更新日期:2008-07-07 00:00:00
abstract:BACKGROUND:The blood-feeding behavior evolved multiple times in Insecta lineages and it represents an excellent opportunity to study patterns of convergent molecular evolution regarding this habit. In insects the expansion of some gene families is linked with blood-feeding behavior, but a wide study comparing the evolu...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-020-01650-3
更新日期:2020-07-17 00:00:00
abstract:BACKGROUND:The evolution of insecticide resistance and persistence of resistance phenotypes are influenced by the fitness of resistance alleles in the absence of insecticide pressure. Experimental determination of fitness is difficult, but fitness can be inferred by measuring changes in allele frequencies in appropriat...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-9-42
更新日期:2009-02-19 00:00:00
abstract::Following publication of the original article. ...
journal_title:BMC evolutionary biology
pub_type: 杂志文章,已发布勘误
doi:10.1186/s12862-018-1321-z
更新日期:2018-12-27 00:00:00
abstract:BACKGROUND:Morphological diversity among closely related animals can be the result of differing growth patterns. The Australian radiation of agamid lizards (Amphibolurinae) exhibits great ecological and morphological diversity, which they have achieved on a continent-wide scale, in a relatively short period of time (30...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-018-1335-6
更新日期:2019-01-08 00:00:00
abstract:BACKGROUND:The eusocial Hymenoptera have radiated across a wide range of thermal environments, exposing them to significant physiological stressors. We reconstructed the evolutionary history of three families of Heat Shock Proteins (Hsp90, Hsp70, Hsp40), the primary molecular chaperones protecting against thermal damag...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-015-0573-0
更新日期:2016-01-19 00:00:00
abstract:BACKGROUND:Medicinal leeches became infamous for their utility in bloodletting popularized in the 19th century, and have seen a recent resurgence in post-operative treatments for flap and replantation surgeries, and in terms of characterization of salivary anticoagulants. Notorious throughout the world, the quintessent...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-9-246
更新日期:2009-10-07 00:00:00
abstract:BACKGROUND:Although the gene encoding for glutamine synthetase (glnA) is essential in several organisms, multiple glnA copies have been identified in bacterial genomes such as those of the phylum Actinobacteria, notably the mycobacterial species. Intriguingly, previous reports have shown that only one copy (glnA1) is e...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-9-48
更新日期:2009-02-26 00:00:00
abstract:BACKGROUND:Vertebrate SWS1 visual pigments mediate visual transduction in response to light at short wavelengths. Due to their importance in vision, SWS1 genes have been isolated from a surprisingly wide range of vertebrates, including lampreys, teleosts, amphibians, reptiles, birds, and mammals. The SWS1 genes exhibit...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-6-97
更新日期:2006-11-15 00:00:00
abstract:BACKGROUND:Ependymins were originally defined as fish-specific secreted glycoproteins involved in central nervous system plasticity and memory formation. Subsequent research revealed that these proteins represent a fish-specific lineage of a larger ependymin-related protein family (EPDRs). EPDRs have now been identifie...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-018-1306-y
更新日期:2018-12-04 00:00:00
abstract:BACKGROUND:The reactive oxygen-generating NADPH oxidases (Noxes) function in a variety of biological roles, and can be broadly classified into those that are regulated by subunit interactions and those that are regulated by calcium. The prototypical subunit-regulated Nox, Nox2, is the membrane-associated catalytic subu...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-7-178
更新日期:2007-09-27 00:00:00
abstract:BACKGROUND:Evolutionary histories of glutamyl-tRNA synthetase (GluRS) and glutaminyl-tRNA synthetase (GlnRS) in bacteria are convoluted. After the divergence of eubacteria and eukarya, bacterial GluRS glutamylated both tRNAGln and tRNAGlu until GlnRS appeared by horizontal gene transfer (HGT) from eukaryotes or a dupli...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-14-26
更新日期:2014-02-12 00:00:00
abstract:BACKGROUND:We previously found the first examples of splicing of archaeal pre-mRNAs for homologs of the eukaryotic CBF5 protein (also known as dyskerin in humans) in Aeropyrum pernix, Sulfolobus solfataricus, S. tokodaii, and S. acidocaldarirus, and also showed that crenarchaeal species in orders Desulfurococcales and ...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-9-198
更新日期:2009-08-11 00:00:00
abstract:BACKGROUND:The Bacillus subtilis-group and the Bacillus cereus-group are two well-studied groups of species in the genus Bacillus. Bacteria in this genus can produce a highly resistant cell type, the spore, which is encased in a complex protective protein shell called the coat. Spores in the B. cereus-group contain an ...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-13-261
更新日期:2013-11-27 00:00:00
abstract:BACKGROUND:Bacterial global regulators each regulate the expression of several hundred genes. In Escherichia coli, the top seven global regulators together control over half of all genes. Leucine-responsive regulatory protein (Lrp) is one of these top seven global regulators. Lrp orthologs are very widely distributed, ...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-016-0685-1
更新日期:2016-05-20 00:00:00
abstract:BACKGROUND:Rh50 proteins belong to the family of ammonia permeases together with their Amt/MEP homologs. Ammonia permeases increase the permeability of NH3/NH4+ across cell membranes and are believed to be involved in excretion of toxic ammonia and in the maintenance of pH homeostasis. RH50 genes are widespread in euka...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-016-0850-6
更新日期:2017-01-03 00:00:00
abstract:BACKGROUND:Many animals live in groups. One proposed reason is that grouping allows cooperative food finding. Group foraging models suggest that grouping could increase food finding rates, but that such group processes could be evolutionarily unstable. These models assume discrete food patches which are fully detectabl...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-11-335
更新日期:2011-11-17 00:00:00
abstract:BACKGROUND:The classification of royal ferns (Osmundaceae) has long remained controversial. Recent molecular phylogenies indicate that Osmunda is paraphyletic and needs to be separated into Osmundastrum and Osmunda s.str. Here, however, we describe an exquisitely preserved Jurassic Osmunda rhizome (O. pulchella sp. nov...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-015-0400-7
更新日期:2015-06-30 00:00:00
abstract:BACKGROUND:A single measles vaccination provides lifelong protection. No antigenic variants that escape immunity have been observed. By contrast, influenza continually evolves new antigenic variants, and the vaccine has to be updated frequently with new strains. Both measles and influenza are RNA viruses with high muta...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/1471-2148-7-229
更新日期:2007-11-15 00:00:00
abstract:BACKGROUND:Many butterflies possess striking structures called eyespots on their wings, and several studies have sought to understand the selective forces that have shaped their evolution. Work over the last decade has shown that a major function of eyespots is their ability to reduce predation by being intimidating to...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-015-0307-3
更新日期:2015-03-09 00:00:00
abstract:BACKGROUND:Adaptive radiations are triggered by ecological opportunity - the access to novel niche domains with abundant available resources that facilitate the formation of new ecologically divergent species. Therefore, as new species saturate niche space, clades experience a diversity-dependent slowdown of diversific...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-019-1344-0
更新日期:2019-01-09 00:00:00
abstract:BACKGROUND:The host range of a pathogenic bacterial strain likely influences its effective population size, which in turn affects the efficacy of selection. Transmission between competent hosts may occur more frequently for host generalists than for specialists. This could allow higher bacterial population densities to...
journal_title:BMC evolutionary biology
pub_type: 杂志文章
doi:10.1186/s12862-015-0335-z
更新日期:2015-03-31 00:00:00