[HTML][HTML] Cloning of the genomes of human cytomegalovirus strains Toledo, TownevarRIT3, and Townelong as BACs and site-directed mutagenesis using a PCR …

G Hahn, D Rose, M Wagner, S Rhiel, MA McVoy - Virology, 2003 - Elsevier
G Hahn, D Rose, M Wagner, S Rhiel, MA McVoy
Virology, 2003Elsevier
The 230-kb human cytomegalovirus genome is among the largest of the known viruses.
Experiments to determine the genetic determinants of attenuation, pathogenesis, and tissue
tropism are underway; however, a lack of complete sequence data for multiple strains and
substantial problems with genetic instability during in vitro propagation create serious
complications for such studies. For example, recent findings suggest that common laboratory
strains Towne and AD169 passaged in cultured human fibroblasts are missing up to 15 kb of …
The 230-kb human cytomegalovirus genome is among the largest of the known viruses. Experiments to determine the genetic determinants of attenuation, pathogenesis, and tissue tropism are underway; however, a lack of complete sequence data for multiple strains and substantial problems with genetic instability during in vitro propagation create serious complications for such studies. For example, recent findings suggest that common laboratory strains Towne and AD169 passaged in cultured human fibroblasts are missing up to 15 kb of genetic information relative to clinical isolates. To establish standard, genetically stable genomes that can be sequenced, disseminated, and repeatedly reconstituted to produce virus stocks, we have undertaken to clone two variants of Towne, designated Townelong and Towneshort (referred to asTownevarRIT3) (A. Skaletskaya et al., 2001, Proc. Natl. Acad. Sci. USA 98, 7829–7834), and the pathogenic strain Toledo into bacterial artificial chromosomes (BACs). We further demonstrate the ease with which mutagenesis can be achieved by deleting 13.5 kb from the Toledo genome using a PCR-based technique.
Elsevier