Query: NC_000963:1024000 Rickettsia prowazekii str. Madrid E, complete genome Lineage: Rickettsia prowazekii; Rickettsia; Rickettsiaceae; Rickettsiales; Proteobacteria; Bacteria General Information: This strain is an egg-passaged attentuated avirulent strain that has been used as a live vaccine and was originally isolated from a typhus patient in Madrid. This species is the causal agent of typhus. The bacteria are transmitted via an insect, usually a tick, to a host organism, in this case humans, where they target endothelial cells and sometimes macrophages. They attach via an adhesin, rickettsial outer membrane protein A, and are internalized where they persist as cytoplasmically free organisms. Transovarial transmission (from mother to offspring) occurs in the invertebrate host.
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General Information: A nematode endosymbiont. This group of bacteria are associated with a variety of invertebrate species, some as pathogens, some in a symbiotic relationship. Typically these organisms are transmitted maternally from mother to daughter transovarially (through the egg) although these bacteria can affect their hosts reproductive capabilities in order to enhance transmission. The net outcome is the increase of hosts carrying the bacteria in the next generation, thereby increasing transmission. This strain naturally infects Brugia malayi, a parasitic filarial nematode that causes lymphatic filariasis, one of the most devastating diseases in humans. The endosymbiont plays important roles in the biology of the nematide host. One of the known such effects are aberrant sex ratios in the host, parthenogenesis and feminization of genetic males, etc.