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J Virol. 1983 May; 46(2): 632-637

Isolation of a nondefective recombinant between adenovirus type 5 and early region 1A of adenovirus type 12.

ABSTRACT

A nondefective recombinant between adenovirus type 5 (Ad5) and type 12 (Ad12), rc-1 (Ad5 dl312, carrying the Ad12 E1A gene), was isolated from hamster cell foci transformed by a defective recombinant, rcB-1 (dl312, carrying the Ad12 E1 gene). The recombinant rc-1 grew in human embryo kidney and KB cells in the absence of helper and synthesized Ad12 T antigen g, the product of the E1A gene. The genome of rc-1 has a deletion between 79.9 and 82.5 map units of Ad5 dl312 DNA with an insertion of 0.1 to 5.5 map units of Ad12 DNA at the deletion site. The mRNAs of Ad12 E1A were transcribed from the Ad12 E1A promoter, and unusual RNAs were abundantly transcribed from the Ad5 E3 promoter on the opposite strand. The frequency of cell transformation with rc-1 was lower than those with Ad5 and Ad12 wild types.