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Molecular Biology and Evolution, Vol 9, 41-55, Copyright © 1992 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

A new 5' sequence associated with mouse L1 elements is representative of a major class of L1 termini

V Jubier-Maurin, G Cuny, AM Laurent, L Paquereau and G Roizes
CNRS (CRBM-UPR 8402) Inserm U.249, Institut de Biologie, Montpellier, France.

Full-length L1 elements have been shown to possess, at their 5' end, tandem repeats called "A" or "F" types. By sequencing the 5' region of two large L1 copies that did not hybridize to A or F probes, we have identified a new sequence that is found at the 5' end of many L1 elements and that we call "V." The element characterized has no 200-bp tandem repetitive structure, and the new 5' sequence is not similar to the A or F sequences. The study of the relationships between the V and L1 sequences has shown that only half of the V (i.e., V-specific 5') sequences in the genome are linked to the 5' end of L1 copies. In related rodent species, a comparative study by Southern blot and PCR analysis of the V sequence suggests that this L1 subfamily has an ancient origin and that V sequence isolated from the remainder of the L1 element has been amplified during the evolution of the mouse genome.
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