Tissue tropism of the TTV in experimentally infected rhesus monkeys / 中华医学杂志(英文版)

<p><b>OBJECTIVE</b>To determine whether the transfusion-transmitted virus (TTV) is hepatotropic.</p><p><b>METHODS</b>Total DNA was extracted from various tissues of 5 experimentally infected Rhesus monkeys during the viremic period. A dot hybridization was done with viral double stranded DNA probes or single antisense probes.</p><p><b>RESULTS</b>The double-stranded probe was hybridized with DNA from the liver, bone marrow, spleen,stomach, small intestine and colon. The single-stranded antisense probe was hybridized with DNA from the liver, small intestine and bone marrow of all 5 monkeys, but not with that from other tissues.</p><p><b>CONCLUSIONS</b>As the viral genome was of negative polarity, the plus-stranded fragment identified in our study might be a replicative intermediate, and was only demonstrated in the liver, small intestine, and bone marrow by dot blot hybridization with single-stranded antisense probes. It is suggested that the TTV replicates in the liver, bone marrow and small intestine, and TTV might be hepatotropic.</p>

Gene variations in the basic core promotor and the pre C/C region of hepatitis B virus / 解放军医学杂志

Objective To study the mutants of pre C/C gene and the base core premotor (BCP) in chronic hepatitis B patients carrying or not carrying hepatitis B e antigen (HBeAg). Method The HBV DNA of BCP and PreC/C ware amplified by PCR from serum samples of patients with chronic hepatitis B, and the products were cloned into T vector and sequenced. Results Of BCP variants, the double mutations of T1762/ A1764 were found in 20 of 42 patients with chronic hepatitis, and the prevalence was significantly lower in HBeAg positive patients (7/20) than in HBeAg negative patients (13/22) (P