title: Genomic transcriptional profiling of the developmental cycle of Chlamydia trachomatis.
abstract: Chlamydia trachomatis is one of the most common bacterial pathogens and is the etiological agent of debilitating sexually transmitted and ocular diseases in humans. The organism is an obligate intracellular prokaryote characterized by a highly specialized biphasic developmental cycle. We have performed genomic transcriptional analysis of the chlamydial developmental cycle. This approach has led to the identification of a small subset of genes that control the primary (immediate-early genes) and secondary (late genes) differentiation stages of the cycle. Immediate-early gene products initiate bacterial metabolism and potentially modify the bacterial phagosome to escape fusion with lysosomes. One immediate early gene (CT147) is a homolog of the human early endosomal antigen-1 that is localized to the chlamydial phagosome; suggesting a functional role for CT147 in establishing the parasitophorous vacuole in a nonfusogenic pathway. Late gene products terminate bacterial cell division and constitute structural components and remodeling activities involved in the formation of the highly disulfide cross-linked outer-membrane complex that functions in attachment and invasion of new host cells. Many of the genes expressed during the immediate-early and late differentiation stages are Chlamydia-specific and have evolutionary origins in eukaryotic lineages.
authors.affiliation: Laboratory of Human Bacterial Pathogenesis, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Disease, National Institutes of Health, Hamilton, MT 59840, USA. rbelland@niaid.nih.gov
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Belland
authors.forename: Guangming
authors.initials: G
authors.lastname: Zhong
authors.forename: Deborah D
authors.initials: DD
authors.lastname: Crane
authors.forename: Daniel
authors.initials: D
authors.lastname: Hogan
authors.forename: Daniel
authors.initials: D
authors.lastname: Sturdevant
authors.forename: Jyotika
authors.initials: J
authors.lastname: Sharma
authors.forename: Wandy L
authors.initials: WL
authors.lastname: Beatty
authors.forename: Harlan D
authors.initials: HD
authors.lastname: Caldwell
mesh_terms: D001425:Bacterial Outer Membrane Proteins / Q000378:metabolism; D002453:Cell Cycle / Q000235:genetics; D002462:Cell Membrane / Q000378:metabolism; D002692:Chlamydia trachomatis / Q000235:genetics* / Q000254:growth & development; D020869:Gene Expression Profiling; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D017781:Genes, Immediate-Early; D006367:HeLa Cells / Q000382:microbiology; D006801:Humans; D008854:Microscopy, Electron; D008856:Microscopy, Fluorescence; D020411:Oligonucleotide Array Sequence Analysis; D011233:Precipitin Tests; D014158:Transcription, Genetic; D014617:Vacuoles / Q000378:metabolism
chemical_list: D001425:Bacterial Outer Membrane Proteins