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- W2081735518 abstract "LINE-1 (L1) is a mammalian family of highly repeated DNA sequences that are members of a class of transposable elements whose movement involves an RNA intermediate. Both structural and evolutionary data indicate that the L1 family consists of a small number of active transposable elements interspersed with a large number of L1 pseudogenes. In the mouse, the longest, characterized L1 sequences span about 7000 base-pairs and contain two long open reading frames. Two subfamilies of mouse L1 elements, A and F, have been defined on the basis of the type of putative transcriptional regulatory sequence found at the 5' end. In order to identify a transcribed subset of L1 elements in mouse F9 teratocarcinoma cells, we have examined the strand-specificity of L1 transcription by Northern analysis and compared the open reading frame-1 sequences of ten A-type cDNAs with fifteen genomic A-type L1 elements. Transcripts containing A-type sequence are far more abundant than those containing F-type sequence. Although the majority of L1 RNA in F9 cells appears to be transcribed non-specifically from both strands, our results provide evidence for a subpopulation of variable length, strand-specific transcripts arising from A-type transcriptional regulatory sequences. F9 cell cDNA sequences, which share greater than 99.5% sequence identity with one another, represent a homogeneous subset of the genomic L1 population. Examination of genomic mouse L1 sequences reveals three types of length polymorphism in a defined segment of the first open reading frame. Phylogenetic analysis shows a correlation between the type of length polymorphism in the first open reading frame and the relative age of an individual A-type genomic L1 element. Comparison of the cDNA and genomic sequences indicates that the youngest subgroup of A-type L1 elements is preferentially transcribed in F9 cells. This subgroup may be currently dominating the L1 dispersal process in mice." @default.
- W2081735518 created "2016-06-24" @default.
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- W2081735518 date "1992-04-01" @default.
- W2081735518 modified "2023-10-16" @default.
- W2081735518 title "Strand-specific LINE-1 transcription in mouse F9 cells originates from the youngest phylogenetic subgroup of LINE-1 elements" @default.
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- W2081735518 doi "https://doi.org/10.1016/0022-2836(92)90544-t" @default.
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