Document Detail

Infection of developing mouse embryos with murine leukemia virus: tissue specificity and genetic transmission of the virus.
MedLine Citation:
PMID:  1010468     Owner:  NLM     Status:  MEDLINE    
The tissue specificity of Moloney leukemia virus (M-MuLV) was studied by infecting mice at two different stages of development. Either newborn mice which can be considered as essentially fully differentiated animals were infected with M-MuLV or preimplantation mouse embryos were infected in vitro at the 4-8 cell stage, a stage of development before any differentiation has taken place. After surgical transfer to the uteri of pseudopregnant surrogate mothers, the latter developed to term and adult mice. In both cases, animals were obtained that had developed an M-MuLV induced leukemia. Molecular hybridization tests for the presence of M-MuLV-specific sequences were conducted on DNA extracted from different tissues of leukemic animals to determine which tissues were successfully infected by the virus. Mice which were infected as newborns carried M-MuLV-specific DNA sequences in "target tissues" only, i. e., thymus, spleen, lymph nodes or in organs infiltrated by tumor cells, whereas "non-target tissues" did not carry virus-specific sequences. In contrast, when leukemic animals derived from M-MuLV-infected preimplantation embryos were analyzed, virus-specific sequences were detected in target tissues as well as in non-target tissues, such as liver, kidney, brain, testes and the germ line. To study the expression of the viral DNA integrated in target and non-target organs, RNA was extracted from different tissues of an animal infected at the preimplantation stage. Fifty to 100 times more M-MuLV-specific RNA was detected in tumor tissues than was found in non-target organs. Since all organs contained the same amount of virus-specific DNA, these results indicate that the integrated virus genome can be differentially expressed in different tissues. The organ-tropism of RNA tumor viruses is discussed in view of these findings. Mice that were infected at the preimplantation stage were found to have M-MuLV integrated into their germ line. Virus transmission from the father to the offspring occurred according to simple Mendelian expectations. Molecular hybridization tests revealed that in the animals studied, the virus was integrated into the germ line at only one out of two or three possible integration sites. During the development of leukemia amplification of this virus copy was observed in the target tissues only, but not in the non-target tissues.
R Jaenisch; J Dausman; V Cox; H Fan
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Hämatologie und Bluttransfusion     Volume:  19     ISSN:  0440-0607     ISO Abbreviation:  Hamatol. Bluttransfus.     Publication Date:  1976  
Date Detail:
Created Date:  1977-03-21     Completed Date:  1977-03-21     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7804332     Medline TA:  Hamatol Bluttransfus     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  341-56     Citation Subset:  IM    
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MeSH Terms
Animals, Newborn / microbiology
Blood / microbiology
DNA, Viral / analysis*
Embryo, Mammalian / microbiology
Leukemia, Experimental / genetics*,  microbiology
Moloney murine leukemia virus
Organ Specificity
RNA, Viral / analysis
Transcription, Genetic
Virus Replication
Reg. No./Substance:
0/DNA, Viral; 0/RNA, Viral

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