Different levels of transcriptional regulation due to trophic constraints in the reduced genome of Buchnera aphidicola APS

Article Abstract:

Experimental designs with the nutritional physiology of the symbiosis between Buchnera and pea aphids are tested by comparing the omission of essential phenylalanine and the nonessential tyrosine with the presence of dietary amino acids in different ratios. A significant transcriptional regulation is observed at different levels of organization in the Buchnera genome between genes within putative transcription units, and within specific metabolic pathways, despite the absence of regulatory elements.

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Fitness and life-history traits of the two major mitochondrial DNA haplotypes of Drosophila subobscura

Article Abstract:

Mitochondrial DNA restriction site analyses on natural populations of Drosophila subobscura have proved the existence of two common, coexisting haplotypes (I and II), as well as a set of less frequent ones derived from them. The fitness components and life history of the two main haplotypes I and II were maintained in the laboratory cages.

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Chromosomal stasis versus plasmid plasticity in aphid endosymbiont Buchnera aphidicola

Article Abstract:

The study of three genomes of the aphid endosymbiont Buchnera aphidicola that has revealed an extraordinary stasis-conservation of gene order and genetic composition of the chromosome, chromosome size and the number of genes as reduced is described. A two step scenario to explain the contrasting modes of evolution is discussed.

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