Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:2.7.7.7 (DNA polymerase)
 17,007 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Although neurological symptoms are common in Whipple's disease, patients rarely have a purely neurological presentation and involvement restricted to the central nervous system is uncommon. A 39 year old woman presented with a meningoencephalitic illness, which responded to penicillin. Eleven months later she developed recurrent stroke-like episodes. Patchy enhancing meningeal, cortical, and subcortical lesions thought to be vascular in origin developed within nine days of the onset of symptoms. No evidence was found of a cardiovascular source of emboli, vasculitis, or thrombophilic condition. A brain biopsy showed meningoencephalitic features suspicious of Whipple's disease associated with leptomeningeal arterial fibrosis and thrombosis. DNA polymerase chain reaction confirmed Tropheryma whippelii in both blood and brain tissue. The neurological manifestations of cerebral Whipple's disease are varied and very rarely include stroke-like symptoms. The pathogenesis of cerebral infarction in Whipple's disease is not well established but arterial fibrosis and endocarditis complicated by embolisation have been reported. This case emphasises the importance of early brain biopsy in unusual cases of stroke and illustrates the clinical utility of polymerase chain reaction to confirm Whipple's disease.
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PMID:Cerebral Whipple's disease with a stroke-like presentation and cerebrovascular pathology. 1218 76

Rare cases of culture-negative infective endocarditis are caused by Tropheryma whipplei, the uncommon bacterium of Whipple's disease. We evaluated an 80-year-old woman with valvular heart disease but without intestinal Whipple's disease. The diagnosis of aortic valve xenograft culture-negative infection with T. whipplei was established by multiple molecular assays and by electron microscopy. First, a PCR with broad-range primers identified the complete 16S ribosomal DNA of T. whipplei in bioprosthesis tissue. Novel real-time reverse transcription-PCR assays were developed to detect mRNAs encoding recently identified proteins determined from the T. whipplei genome, specifically Whipplei surface protein (TW113) and a DNA polymerase III subunit (TW727). The positive detection of mRNAs indicated the presence of metabolically active bacteria and suggested the viability of T. whipplei. The quantification of T. whipplei genome equivalents by real-time PCR indicated a high-density bacterial colonization of the valve tissue. Additionally, an ultrastructural examination revealed numerous rod-shaped bacteria consistent in size with T. whipplei in the extracellular collagen matrix of the bioprosthesis. We conclude that extracellular growth of T. whipplei can occur in the microenvironment of biological prosthetic valve tissue and that T. whipplei endocarditis can occur in the absence of intestinal Whipple's disease.
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PMID:Tropheryma whipplei Infection of an acellular porcine heart valve bioprosthesis in a patient who did not have intestinal Whipple's disease. 1547 98