Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Critical Care giúp cho các bạn có thêm kiến thức về ngành y học đề tài: Did an ancient chlamydial endosymbiosis facilitate the establishment of primary plastids? | Research Open Access Did an ancient chlamydial endosymbiosis facilitate the establishment of primary plastids Jinling Huang n and Johann Peter Gogarten Addresses Department of Biology Howell Science Complex East Carolina University Greenville NC 27858 USA. tNASA Astrobiology Institute at Marine Biological Laboratory Woods Hole MA 02543 USA. Department of Molecular and Cell Biology University of Connecticut 91 North Eagleville Road Storrs CT 06269-3125 USA. Correspondence Jinling Huang. Email huangj@ Published 4 June 2007 Genome Biology 2007 8 R99 doi 186 gb-2007-8-6-r99 The electronic version of this article is the complete one and can be found online at http 2007 8 6 R99 Received 30 November 2006 Revised 6 March 2007 Accepted 4 June 2007 2007 Huang and Gogarten licensee BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Ancient endosymbioses are responsible for the origins of mitochondria and plastids and they contribute to the divergence of several major eukaryotic groups. Although chlamydiae a group of obligate intracellular bacteria are not found in plants an unexpected number of chlamydial genes are most similar to plant homologs which interestingly often contain a plastid-targeting signal. This observation has prompted several hypotheses including gene transfer between chlamydiae and plant-related groups and an ancestral relationship between chlamydiae and cyanobacteria. Results We conducted phylogenomic analyses of the red alga Cyanidioschyzon merolae to identify genes specifically related to chlamydial homologs. We show that at least 21 genes were transferred between chlamydiae and primary photosynthetic eukaryotes with the donor most similar to the environmental Protochlamydia.
