Nucleic Acids Research, 1984, Vol. 12, No. 8 3503-3519
© 1984
MOLECULAR BIOLOGY |
Characterization of the major mRNAs from adenovirus 2 early region 4 by cDNA cloning and sequencing
Cold Spring Harbor Laboratory, Cold Spring Harbor NY 11724, USA
Received January 10, 1984. Accepted March 21, 1984.
The sequences at the splice junctions of many early region 4 (E4) mRNAs from adenovirus 2 (Ad2) were determined by analysis of cDNA clones. The cDNAs were synthesized from poly(A)+ mRNA isolated from HeLa cells early during Ad2 infection. A standard library was constructed, in pBR322, from double stranded cDNAs initiated by oligo-dT priming. Approximately 1% of total recombinants contained E4 sequences, however among eighty clones analyzed in detail, only four contained the 5' leader sequence. A second library was prepared using a new method that led to a greatly increased representation of desired clones. This method employed oligo-dT to prime the synthesis of the first strand and an oligonucleotide ligated to pBR322, whose sequence was present in the 5' leader, to prime the synthesis of the second strand. With this method the percentage of recombinants containing E4 sequences ranged between 15 and 50% of the total colonies. Virtually all of these E4 cDNA clones contained the 5' leader sequence and several hundred were analyzed by comparing the results from single channel dideoxy sequencing reactions. Nine unique sequence patterns were identified and representative clones were completely sequenced.
*present address: Research Laboratories, Yamasa Shoyu Co. Ltd., 10–1 Araoi-Cho-2-chrome, Choshi, Chiba-ken 288, Japan
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