Abstract：
:The nucleotide sequence complexity of murine leukemia virus *MuLV)-related RNA has been measured by RNA-complementary DNA hybridization analysis in nuclear and cytoplasmic RNA isolated from liver and brain of low-leukemia-strain C57BL/6J mice of different ages. In these two tissues, an approximate 1.5- to 2-fold increase in the complexity of steadystate nuclear MuLV-related RNA sequences was observed as a function of age. Maximum complexity was observed with nuclear RNA extracts from old mice and corresponded to roughly 70 to 75% of the total MuLV genome. In contrast to the age-related increase in complexity of nuclear MuLV genome was detected in liver and brain steady-state cytoplasmic RNA, irrespective of animal age. These data suggest that control mechanisms regulating the transcription and/or stabilization of nuclear RNA transcripts of endogenous mouse MuLV-related genomes become less stringent with animal age even in low-tumor mouse strains. The data also support the existence of independent posttranscriptional mechanisms which prevent accumulation of these MuLV-related transcripts in steady-state cytoplasmic RNA and which do not seem to be as subject to the relaxation of stringency as a function of age.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Florine DL,Ono T,Cutler RG,Getz MJsubject
Has Abstractpub_date
1980-03-01 00:00:00pages
519-23issue
3eissn
0008-5472issn
1538-7445journal_volume
40pub_type
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