Chemistry: molecular biology and microbiology – Treatment of micro-organisms or enzymes with electrical or... – Modification of viruses
Patent
1992-06-24
1997-01-21
Schwartz, Richard A.
Chemistry: molecular biology and microbiology
Treatment of micro-organisms or enzymes with electrical or...
Modification of viruses
4353201, 536 231, 536 241, 536 242, 536 2433, C12N 1566, C12N 1563, C12N 1511
Patent
active
055958958
ABSTRACT:
A highly efficient genetic cloning system is disclosed which is particularly useful for cloning cDNA copies of eukaryotic mRNAs and can direct the orientation of inserts in .lambda.-plasmid composite vectors with large cloning capacities. Cleavage of such vector DNA, by the restriction enzyme SfiI, for example, creates two different non-symmetrical 3' extensions at the ends of vector DNA. Using a linker-primer and an adaptor, cDNA is prepared to have two different sticky ends which can be ligated to those of the vector. When the cDNA fragments and the vector DNAs are mixed, both the molecules can assemble without self-circularization due to base-pairing specificity. This system provides (1) high cloning efficiency (10.sup.7 -10.sup.8 clones/.mu.g poly(A).sup.+ RNA), (2) low background (more than 90% of the clones contain inserts), (3) directional insertion of cDNA fragments into the vectors, (4) presence of a single insert in each clone, (5) accommodation of long inserts (up to 10 kb), (6) a mechanism for rescue of the plasmid part from a .lambda. genome, and (7) a straightforward protocol for library preparation.
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Aaronson Stuart A.
Miki Toru
Hodges Robert A.
Schwartz Richard A.
The United States of America as represented by the Department of
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