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  • 1
    Publication Date: 2000-04-15
    Description: The mechanisms by which hepatitis C virus (HCV) induces chronic infection in the vast majority of infected individuals are unknown. Sequences within the HCV E1 and E2 envelope genes were analyzed during the acute phase of hepatitis C in 12 patients with different clinical outcomes. Acute resolving hepatitis was associated with relative evolutionary stasis of the heterogeneous viral population (quasispecies), whereas progressing hepatitis correlated with genetic evolution of HCV. Consistent with the hypothesis of selective pressure by the host immune system, the sequence changes occurred almost exclusively within the hypervariable region 1 of the E2 gene and were temporally correlated with antibody seroconversion. These data indicate that the evolutionary dynamics of the HCV quasispecies during the acute phase of hepatitis C predict whether the infection will resolve or become chronic.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Farci, P -- Shimoda, A -- Coiana, A -- Diaz, G -- Peddis, G -- Melpolder, J C -- Strazzera, A -- Chien, D Y -- Munoz, S J -- Balestrieri, A -- Purcell, R H -- Alter, H J -- New York, N.Y. -- Science. 2000 Apr 14;288(5464):339-44.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medical Sciences, University of Cagliari, Via San Giorgio 12, 09124 Cagliari, Italy. farcip@pacs.unica.it〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10764648" target="_blank"〉PubMed〈/a〉
    Keywords: Acute Disease ; Adult ; Aged ; Antibodies, Viral ; Disease Progression ; *Evolution, Molecular ; Female ; Genes, Viral ; Genetic Variation ; Hepacivirus/*genetics/immunology/physiology ; Hepatitis C/immunology/*virology ; Hepatitis C Antibodies/biosynthesis ; Hepatitis C, Chronic/immunology/*virology ; Humans ; Male ; Middle Aged ; Molecular Sequence Data ; Phylogeny ; Prospective Studies ; Selection, Genetic ; Time Factors ; Viral Envelope Proteins/*genetics/immunology ; Virus Replication
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 1979-07-13
    Description: Two different ultrastructural alterations were observed in liver cells of chimpanzees inoculated with plasma derived from two different patients with non-A, non-B hepatitis. During the acute phase of illness in one group of four chimpanzees, peculiar tubular structures, composed of two unit membranes with electron-opaque material in between, were observed in the cytoplasm of hepatocytes. In contrast, these structures were never detected in the liver cells of the second group of five chimpanzees that received the second inoculum, However, nuclear changes, usually associated with aggregates of 20- to 27-nanometer particles, were found in hepatocytes of the latter animals. Although these particles resembled viruses, they were not as uniform as small virus particles often appear. In five other chimpanzees inoculated with non-A, non-B hepatitis material not known to be related to the first two inocula, cytoplasmic structures were found in four, and nuclear structures were found in the remaining one. Thus, all 14 chimpanzees inoculated with transmissible non-A, non-B hepatitis agents could be classified as having either nuclear or cytoplasmic changes. These observations add support to epidemiologic data suggesting that there may be more than one agent of non-A, non-B hepatitis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shimizu, Y K -- Feinstone, S M -- Purcell, R H -- Alter, H J -- London, W T -- New York, N.Y. -- Science. 1979 Jul 13;205(4402):197-200.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/451589" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Nucleus/ultrastructure ; Cytoplasm/ultrastructure ; Hepatitis, Viral, Animal/*microbiology ; Hepatitis, Viral, Human/*microbiology ; Inclusion Bodies, Viral/ultrastructure ; Liver/microbiology/ultrastructure ; Microscopy, Electron ; Pan troglodytes
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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