Molecular Biology and Evolution, Vol 9, 41-55, Copyright © 1992 by Society for Molecular Biology and Evolution
V Jubier-Maurin, G Cuny, AM Laurent, L Paquereau and G Roizes
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.
ORIGINAL ARTICLE
A new 5' sequence associated with mouse L1 elements is representative of a major class of L1 termini
CNRS (CRBM-UPR 8402) Inserm U.249, Institut de Biologie, Montpellier, France.
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