Human cytomegalovirus DNA: physical maps for restriction endonucleases BglII, hindIII and XbaI.

It is proposed that the genome of human cytomegalovirus (HCMV) consists of two unique sequences, L and S, bounded by two sets of redundant sequences (P. Sheldrick et al. unpublished data). In this arrangement the terminal sequences (TR1 and TR8) are repeated in an intenal inverted form (IR1 and IR8) and delimit L and S. After restriction endonuclease cleavage of the DNA, four o.5 M and four 0.25 M fragments are found, indicating that HCMV DNA preparations consist of four equimolar populations differing only in the relative orientation of the L and S components. Cleavage of the CMV DNA with the restriction endonucleases BglII, HindIII and XbaI results in 32, 27 and 21 fragments, respectively. The arrangement of these fragments has been determined using molecular hybridization techniques, identification of terminal fragments and the identification of linkage groups by double-digestion. In this report the physical maps for the restriction endonucleases BglII, HindIII and XbaI are presented.