Molecular Cloning of Integrated Gardner-Rasheed Feline Sarcoma Virus: Genetic Structure of Its Cell-derived Sequence Differs from That of Other Tyrosine Kinase-coding Onc Genes
Overview
Affiliations
Gardner-Rasheed feline sarcoma virus (GR-FeSV) is an acute transforming retrovirus which encodes a gag-onc polyprotein possessing an associated tyrosine kinase activity. The integrated form of this virus, isolated in the Charon 21A strain of bacteriophage lambda, demonstrated an ability to transform NIH/3T3 cells at high efficiency upon transfection. Foci induced by GR-FeSV DNA contained rescuable sarcoma virus and expressed GR-P70, the major GR-FeSV translational product. The localization of long-terminal repeats within the DNA clone made it possible to establish the length of the GR-FeSV provirus as 4.6 kilobase pairs. The analysis of heteroduplexes formed between lambda feline leukemia virus (FeLV) and lambda GR-FeSV DNAs revealed the presence of a 1,700-base-pair FeLV unrelated segment, designated v-fgr, within the GR-FeSV genome. The size of this region was sufficient to encode a protein of approximately 68,000 daltons and was localized immediately downstream of the FeLV gag gene coding sequences present in GR-FeSV. Thus, it is likely that this 1.7-kilobase-pair stretch encodes the onc moiety of GR-P70. Utilizing probes representing v-fgr, we detected homologous sequences in the DNAs of diverse vertebrate species, implying that v-fgr originated from a well-conserved cellular gene. The number of cellular DNA fragments hybridized by v-fgr-derived probes indicated either that proto-fgr is distributed over a very large region of cellular DNA or represents a family of related genes. By molecular hybridization, v-fgr was not directly related to the onc genes of other known retroviruses having associated tyrosine kinase activity.
Abe K, Cox A, Takamatsu N, Velez G, Laxer R, Tse S Proc Natl Acad Sci U S A. 2019; 116(24):11872-11877.
PMID: 31138708 PMC: 6575637. DOI: 10.1073/pnas.1819825116.
Broadening the use of antiretroviral therapy: the case for feline leukemia virus.
Greggs 3rd W, Clouser C, Patterson S, Mansky L Ther Clin Risk Manag. 2011; 7:115-22.
PMID: 21479142 PMC: 3071348. DOI: 10.2147/TCRM.S17731.
Weyrauch G, Barnekow A Arch Virol. 1994; 134(1-2):141-55.
PMID: 8279950 DOI: 10.1007/BF01379113.
Hatakeyama S, Iwabuchi K, Ogasawara K, GOOD R, Onoe K Proc Natl Acad Sci U S A. 1994; 91(8):3458-62.
PMID: 8159769 PMC: 43596. DOI: 10.1073/pnas.91.8.3458.
Muller R, Muller D EMBO J. 1984; 3(5):1121-7.
PMID: 6329737 PMC: 557483. DOI: 10.1002/j.1460-2075.1984.tb01939.x.