TT virus in bone marrow transplant recipients.
TT virus (TTV) is a newly discovered transfusion-transmissible DNA virus, which may cause posttransfusion hepatitis. The virus was detected in 12% of Japanese blood donors. The aim of the study is to investigate the prevalence and clinical influence of TTV in bone marrow transplant (BMT) recipients. Sera from 25 BMT recipients obtained 6 to 12 weeks after the transplant were examined for TTV-DNA by the seminested polymerase chain reaction. Serial samples were additionally analyzed in patients with TTV-DNA. Fifteen of 25 recipients (60%) were positive for TTV-DNA after transplant, whereas it was detected in only two of 20 BMT donors (10%). In patients positive for TTV-DNA before BMT, the amount of TTV-DNA decreased to an undetectable level during the myelosuppressed period after BMT. We also found that there was a novel group of TTV, G3, classified by the nucleotide sequences. The median peak alanine aminotransferase (ALT) levels were 135.0 IU/L and 116.5 IU/L (normal range, 4 to 36 IU/L) in TTV-positive and TTV-negative recipients, respectively. In one of the seven TTV-positive patients who developed hepatic injury (ALT > 150 IU/L), a serial change in the serum TTV titer showed a good correlation with the ALT level. We concluded that (1) the prevalence of TTV is high in BMT recipients, (2) TTV might be replicated mainly in hematopoietic cells, (3) transfusion-transmitted TTV may cause persistent infection, (4) a novel genetic group of TTV, G3, was discovered, and (5) TTV does not seem to frequently cause hepatic injury, although one patient was strongly suggested to have TTV-induced hepatitis.
Kanda
Y
Y
Department of Cell Therapy and Transplantation Medicine and the Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Tokyo, Japan.
Tanaka
Y
Y
Kami
M
M
Saito
T
T
Asai
T
T
Izutsu
K
K
Yuji
K
K
Ogawa
S
S
Honda
H
H
Mitani
K
K
Chiba
S
S
Yazaki
Y
Y
Hirai
H
H
D000293:Adolescent; D000328:Adult; D001483:Base Sequence; D001803:Blood Transfusion; D016026:Bone Marrow Transplantation; D017124:Conserved Sequence; D004267:DNA Viruses / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D004279:DNA, Viral / Q000097:blood* / Q000235:genetics / Q000302:isolation & purification; D005260:Female; D006801:Humans; D007564:Japan; D007938:Leukemia / Q000628:therapy; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009190:Myelodysplastic Syndromes / Q000628:therapy; D016415:Sequence Alignment
D004279:DNA, Viral