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Genomic changes following host restriction in bacteria.
Comparisons of genomic features with those of closely related bacteria retaining free-living stages indicate that rapid evolutionary change often occurs immediately after host restriction, which represents a general syndrome of genome evolution. Expand
A genomic perspective on nutrient provisioning by bacterial symbionts of insects
Genomic studies of Buchnera have provided a new means for inferring metabolic capabilities of the symbionts and their likely contributions to hosts, and raises the question of the extent to which gene expression is moderated in response to changing demands imposed by host nutrition or other factors. Expand
Type III secretion systems and the evolution of mutualistic endosymbiosis
It is demonstrated that a mutualistic bacterial endosymbiont of grain weevils maintains and expresses inv/spa genes encoding a type III secretion system homologous to that used for invasion by bacterial pathogens. Expand
Extensive Proliferation of Transposable Elements in Heritable Bacterial Symbionts
It is found that insertion sequence (IS) elements are unusually abundant in the relatively recently evolved bacterial endosymbionts of maize weevils, and this IS expansion may represent an early stage in the genomic reduction that is common in most ancient endosaurs. Expand
Low and homogeneous copy number of plasmid‐borne symbiont genes affecting host nutrition in Buchnera aphidicola of the aphid Uroleucon ambrosiae
The plasmid location of trpEG combined with Buchnera's chromosomal polyploidy may functionally limit, rather than increase, tryptophan production within Uroleucon ambrosiae. Expand
Hatching asynchrony, survival, and the fitness of alternative adult morphs in Ambystoma talpoideum
The hypothesis that early reproduction may be an important mechanism mediating the polymorphism in A. talpoideum is tested and significantly higher survival rates among early-hatchlings relative to late-hatching conspecifics are demonstrated, supporting the hypotheses that early maturation and reproduction in aquatic adults increase fitness. Expand
Rice Weevils and Maize Weevils (Coleoptera: Curculionidae) Respond Differently to Disturbance of Stored Grain
This work elucidates the divergent evolutionary histories of these sibling species but also may provide useful information for the monitoring and control of these stored grain pests. Expand
Intergenic Transposable Elements Are Not Randomly Distributed in Bacteria
  • G. R. Plague
  • Biology, Medicine
  • Genome biology and evolution
  • 8 July 2010
It is hypothesized that not all neighboring gene orientations (NGOs) are selectively equivalent for IS insertion, and analyzed the NGOs of all intergenic ISs in 326 fully sequenced bacterial chromosomes to test this. Expand
Transposable Element Loads in a Bacterial Symbiont of Weevils Are Extremely Variable
Not only are transposable elements profuse in the bacterial endosymbiont of maize weevils, but it is found that their quantities also vary ∼10-fold among individual weevs, suggesting that these essentially asexual bacteria may exhibit substantial intraspecific genomic variation. Expand
Linkages Between Trophic Variability and Distribution of Pteronarcys spp. (Plecoptera: Pteronarcyidae) Along a Stream Continuum
An allozyme electrophoretic analysis on 62 pteronarcids from the LTR drainage basin using five diagnostic gene loci for eastern USA Pter onarcys species determined that three apparent species occur along this stream continuum. Expand