Linked Life Data

11161282

Source:http://linkedlifedata.com/resource/pubmed/id/11161282

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
Pt 2
pubmed:dateCreated
2001-2-22
pubmed:abstractText
Retroviral vectors provide the means for gene transfer with long-term expression. The lentivirus subgroup of retroviruses, such as human immunodeficiency virus type 1 (HIV-1) and type 2 (HIV-2), possesses a number of regulatory and accessory genes and other special elements. These features can be exploited to design vectors for transducing non-dividing as well as dividing cells with the potential for regulated transgene expression. Encapsidation of the transgene RNA in lentiviral vectors is determined by the leader sequence-based multipartite packaging signal. Embedded in the packaging signal is a major splice donor site that, this study shows, is not by itself essential for transgene expression or encapsidation. We designed HIV-2 vectors that contained all the sequence elements thought to be necessary and sufficient for vector RNA encapsidation. Unexpectedly, despite abundant expression, only a small fraction of the transgene RNA was encapsidated and the titre of the vector was low. Redesign of the vector with a mutant splice donor resulted in increased vector RNA encapsidation and yielded vectors with high titre. Inefficient encapsidation by the conventionally designed vector was not due to suboptimal Rev responsive element (RRE)-Rev function. Varying the length of RRE in the vector did not change vector RNA encapsidation, nor did the introduction of a synthetic intron into the mutant vector. The vector RNA with the intact splice donor may have been excessively spliced, decreasing the amount of packageable RNA. A titre of 10(5) transducing units (TU)/ml was readily obtained for vectors with the neo or GFP transgene, and the vector could be concentrated to a titre of 1-5x10(7) TU/ml.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0022-1317
pubmed:author
pubmed:issnType
Print
pubmed:volume
82
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
425-34
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed-meshheading:11161282-Capsid, pubmed-meshheading:11161282-Capsid Proteins, pubmed-meshheading:11161282-Cell Line, pubmed-meshheading:11161282-Gene Expression Regulation, Viral, pubmed-meshheading:11161282-Gene Products, gag, pubmed-meshheading:11161282-Gene Products, rev, pubmed-meshheading:11161282-Genetic Engineering, pubmed-meshheading:11161282-Genetic Vectors, pubmed-meshheading:11161282-HIV-2, pubmed-meshheading:11161282-Humans, pubmed-meshheading:11161282-Introns, pubmed-meshheading:11161282-Mutation, pubmed-meshheading:11161282-Plasmids, pubmed-meshheading:11161282-RNA, Viral, pubmed-meshheading:11161282-RNA Splice Sites, pubmed-meshheading:11161282-Response Elements, pubmed-meshheading:11161282-Transduction, Genetic, pubmed-meshheading:11161282-Transgenes, pubmed-meshheading:11161282-Virus Assembly, pubmed-meshheading:11161282-gag Gene Products, Human Immunodeficiency Virus, pubmed-meshheading:11161282-rev Gene Products, Human Immunodeficiency Virus
pubmed:year
2001
pubmed:articleTitle
Human immunodeficiency virus type 2 lentiviral vectors: packaging signal and splice donor in expression and encapsidation.
pubmed:affiliation
Basic Research Laboratory, Division of Basic Sciences, National Cancer Institute, Building 37, Room 5E10, National Institutes of Health, Bethesda, MD 20892, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.