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    • 93. 发明专利
    • End selection in directed evolution
    • AU3879300A
    • 2000-09-28
    • AU3879300
    • 2000-03-09
    • DIVERSA CORP
    • SHORT JAY MFREY GERHARD JOHANN
    • C12N9/14C12N15/10C40B40/02C40B50/06C12Q1/68
    • This invention provides methods of obtaining novel polynucleotides and encoded polypeptides by the use of non-stochastic methods of directed evolution (DirectEvolution™). A particular advantage of end-selection-based methods is the ability to recover full-length polynucleotides from a library of progeny molecules generated by mutagenesis methods. These methods include non-stochastic polynucleotide site-saturation mutagenesis (Gene Site Saturation Mutagenesis™) and non-stochastic polynucleotide reassembly (GeneReassembly™). This invention provides methods of obtaining novel enzymes that have optmized physical and/or biological properties. Through use of the claimed methods, genetic vaccines, enzymes, small molecules, and other desirable molecules can be evolved towards desirable properties. For example, vaccine vectors can be obtained that exhibit increased efficacy for use as genetic vaccines. Vectors obtained by using the methods can have, for example, enhanced antigen expression, increased uptake into a cell, increased stability in a cell, ability to tailor an immune response, and the like. Furthermore, this invention provides methods of obtaining a variety of novel biologically active molecules, in the fields of antibiotics, pharmacotherapeutics, and transgenic traits.
    • 94. 发明专利
    • CONSTRUCTION AND USE OF CATALOGUED NUCLEIC ACID LIBRARIES THAT CONTAIN ADVANTAGEOUSLY ADJUSTED REPRESENTATIONS OF DEFINED COMPONENTS
    • CA2330827A1
    • 1999-12-09
    • CA2330827
    • 1999-06-03
    • DIVERSA CORP
    • SHORT JAY M
    • C12N15/09C07B61/00C07H21/00C12Q1/68C12N1/00C12N9/00C12N11/00C12Q1/00C12N15/10
    • A process for constructing a catalogued nucleic acid library in which the proportional representation of the constituents is adjusted to advantage through the use of disclosed technologies for positive and negative selection. The resultant benefit is that significantly fewer library constituents will need to be screened in order to identify a potentially desired constituent. Moreover, library constituents that previously would have been essentially "lost" are now recoverable. Preferred embodiments of this invention include the cataloguing, normalization, and enrichment of library constituents. By way of example, but not limitation, this technology is serviceable for constructing a library that contains an adequate representation of desirable constituents that (1) are initially found in low-copy numbers within a sample source or (2) originate from an organism that is problematic to culture. Applicable uses of this invention include any library-screening endeavor previously hindered by logistical impediments. By expanding previous logistical frontiers this invention allows for a novel generation of previously unattainable molecules - particularly molecules that are "unclonable" from conventional, unadjusted libraries - to now be detected, cloned, manipulated, expressed, studied, and used. By disclosing the construction and screening of high yielding nucleic acid libraries from mixed and uncultivated organisms, the instant technology eclipses former boundaries in the area of biological discovery and enables the full breadth of biological diversity to be accessed in the search for previously undiscovered genes and gene products. The benefits of the present invention are seen to extend to areas of diagnosis, medicine, agriculture, manufacturing, and academia.