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Background  The ability to genetically manipulate bacteria has been fundamentally important for both basic biological discovery and translational research to develop new vaccines and antibiotics. Experimental alteration of the genetic content of prokaryotic pathogens has revealed both expected functional relationships and unexpected phenotypic consequences. Slow growth phenotypes have been reported for multiple transformed bacterial species, including extracellular and intracellular pathogens. Understanding the genes and pathways responsible for the slow growth phenotype provides the opportunity to develop attenuated vaccines as well as bacteriostatic antibiotics. Transformed  Anaplasma marginale , a rickettsial pathogen, exhibits slow growth  in vitro  and  in vivo  as compared to the parent wild type strain, providing the opportunity to identify the underlying genes and pathways associated with this phenotype.    Results  Whole genome transcriptional profiling allowed for identification of specific genes and pathways altered in transformed  A. marginale . Genes found immediately upstream and downstream of the insertion site, including a four gene operon encoding key outer membrane proteins, were not differentially transcribed between wild type and transformed  A. marginale.  This lack of significant difference in transcription of flanking genes and the large size of the insert relative to the genome were consistent with a  trans  rather than a  cis  effect. Transcriptional profiling across the complete genome identified the most differentially transcribed genes, including an iron transporter, an RNA cleaving enzyme and several genes involved in translation. In order to confirm the trend seen in translation-related genes, K-means clustering and Gene Set Enrichment Analysis (GSEA) were applied. These algorithms allowed evaluation of the behavior of genes as groups that share transcriptional status or biological function. Clustering and GSEA confirmed the initial observations and found additional pathways altered in transformed  A. marginale . Three pathways were significantly altered as compared to the wild type: translation, translation elongation, and purine biosynthesis.    Conclusions  Identification of perturbed genes and networks through genome wide transcriptional profiling highlights the relevance of pathways such as nucleotide biosynthesis, translation, and translation elongation in the growth phenotype of obligate intracellular bacteria. These genes and pathways provide specific targets for development of slow growing attenuated vaccines and for bacteriostatic antibiotics.

Transcriptional pathways associated with the slow growth phenotype of transformed Anaplasma marginale