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Nucleic Acids Research, 1980, Vol. 8, No. 15 3287-3305
© 1980

MOLECULAR BIOLOGY

Sequence organization of feline leukemis virus DNA in infected cells

James I. Mullins, James W. Casey, Margery O. Nicolson* and Norman Davidson

Department of Chemistry, California Institute of Technology Pasadena, CA 91125, USA *Childrens Hospital of Los Angeles P.O. Box 54700, Terminal Annex, Los Angeles, CA 90054, USA

Received June 18, 1980. A restriction site map has been deduced of unintegrated and integrated FeLV viral DNA found in human RD cells after experimental infection with the Gardner-Arnstein strain of FeLV. Restriction fragments were ordered by single and double enzyme digests followed by Southern transfer (1) and hybridization with 32P-labeled viral cDNA probes. The restriction map was oriented with respect to the 5' and 3' ends of viral RNA by using a 3' specific hybridization probe. The major form of unintegrated viral DNA found was a 8.7 kb linear DNA molecule bearing a 450 bp direct long terminal redundancy (LTR) derived from both 5' and 3' viral RNA sequences. Minor, circular forms, 8.7 kb and 8.2 kb in length were also detected, the larger one probably containing two adjacent copies of the LTR and the smaller one containing one copy of the LTR. Integrated copies of FeLV are colinear with the unintegrated linear form and contain the KpnI and SmaI sites found in each LTR.


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