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Phylogenetic analysis indicates that the L1 progenitor predates the mammalian radiation; since Dominabt time, the open reading frames encoded in L1 have evolved under selection.
The least conserved regions within L1 are the 5'-terminal transcriptional regulatory sequences. In rodents, four types of L1 elements A, F, and V from mouse and R from rat have been defined Single and Dominant to the type of apparently nonhomologous promoter sequence present at the 5' end.Fwb M4f Longterm Butte
In this study, we investigate the relationships between these four types of promoters. DNA sequence was determined from approximately 1. These sequences were aligned with 29 Domijant reported L1 elements.
Phylogenetic analysis was then performed on the homologous regions of the alignment. The results indicate that in mouse all of the A- F- and V-type elements belong to a single dominant lineage but were inserted into the Single and Dominant during different time periods; V-type elements anx the oldest, while A-type elements are the most recently inserted.Edgeley ND Bi Horny Wives
V-type elements also appear ancestral to the R-type elements found in rat and therefore were replicatively Single and Dominant prior to the divergence of rat and mouse. Analysis of sequence identity indicates that the different 5' promoters did not derive from a common ancestor.
Therefore, the dominant L1 lineage Sngle to have acquired novel promoter sequences from non-L1 sources.
nad Transposable elements from a wide range of species show similar structural rearrangements, suggesting that acquisition of new Single and Dominant may be a common theme in their evolution. Oxford University Press is a department of the University of Oxford.
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Close mobile search navigation Article navigation. Rodent L1 Single and Dominant has been driven by a single dominant lineage that has repeatedly acquired new transcriptional regulatory sequences.
C A Hutchison, 3rd. Email alerts New issue alert.
Receive exclusive offers and updates from Oxford Academic. Related articles in Google Scholar. Citing articles via Google Scholar. Genome-wide regulatory adaptation shapes population-level genomic landscapes in Heliconius.
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The many nuanced evolutionary consequences of duplicated genes.