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US5278056A Expired / Lapsed US ⏱️ 0.0 years remaining

Retroviral packaging cell lines and process of using same

Assignee: Columbia University
•
Filing: 1992-04-29
•
Granted: 1994-01-11
•
Expires: 2012-04-29
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Abstract

Abstract The invention relates to a mammalian cell line useful for retroviral packaging comprising two plasmids, the first such plasmid comprising in 5' to 3' order: a DNA sequence comprising a 5' long terminal repeat (LTR); a mutated (psi) packaging sequence; a DNA sequence comprising the encoding portion of the Moloney murine leukemia virus (MULV) env gene; and the second such plasmid comprising in 5' to 3' order: a DNA sequence comprising a 5' long terminal repeat (LTR); a mutated (psi) packaging sequence; a DNA sequence comprising the encoding portion of the Moloney murine leukemia virus (MULV) gag and pol genes; a selectable marker; and an origin of replication. The invention also relates to processes for preparing a producer cell line useful for transferring a gene of interest into recipient mammalian cells in vitro.

Inventors

  • 👤 Arthur Bank
  • 👤 Dina G. Markowitz
  • 👤 Stephen P. Goff

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 09:10
CPC Classifications
C; C12; C12N; C12N15/00; C12N15/09; C12N15/63; C12N15/79; C12N15/85; C12N15/86; C12N2740/00; C12N2740/00011; C12N2740/10011; C12N2740/13011; C12N2740/13051; C12N2740/13052

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 11 words
The ecotropic cell line designated GP+E-86 (ATCC Accession No. CRL 9642).
Claim 2
Dependent Claim 11 words
The ecotropic cell line designated GP+E-86 (ATCC Accession No. CRL 9642).
Claim 3
Dependent Claim 11 words
The amphotropic cell line designated GP+envAm-12 (ATCC Accession No. CRL 9641).
Claim 4
Dependent Claim 11 words
The amphotropic cell line designated GP+envAm-12 (ATCC Accession No. CRL 9641).
Claim 5
Dependent Claim 68 words
A process for generating a producer cell line useful for transferring a gene of interest into recipient mammalian cells comprising transfecting cells of the cell line of claim 31 or 32 with a vector plasmid which comprises a psi packaging sequence, a gene associated with a selectable or identifiable phenotypic trait which is manifested when the plasmid is present in a transfected cell, and a gene of interest.
Claim 6
Dependent Claim 11 words
The process of claim 3, wherein the vector plasmid is Δneo.
Claim 7
Dependent Claim 11 words
The process of claim 3 wherein the vector plasmid is N2.
Claim 8
Dependent Claim 12 words
The process of claim 3, wherein the phenotypic trait is drug resistance.
Claim 9
Dependent Claim 12 words
The process of claim 6, wherein the drug resistance is neomycin resistance.
Claim 10
Dependent Claim 10 words
The producer cell produced by the process of claim 3.
Claim 11
Dependent Claim 115 words
A method for transferring a gene of interest into recipient mammalian cells comprising: (a) transfecting cells of the cell line of claim 31 or 32 with a vector plasmid which comprises a psi packaging sequence, a gene associated with a selectable or identifiable phenotypic trait which is manifested when the plasmid is present in a transfected cell, and a gene of interest, so as to generate producer cells; (b) isolating producer cells from mammalian cells which secrete the selectable marker contained within the vector; (c) separating the isolated producer cells from the secreted vector; and (d) contacting the secreted vector with a recipient mammalian cell thereby transferring a gene of interest into recipient mammalian cells.

References Cited (Backward Citations)

US4650764A Cited
US4861719A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1997-01-10 1997-07-12 1998-01-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2001-01-10 2001-07-12 2002-01-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2005-01-10 2005-07-12 2006-01-11 $7700.00 Window Closed / Lapsed

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