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. 1994 Jun 25;22(12):2222–2227. doi: 10.1093/nar/22.12.2222

A master sequence related to a free left Alu monomer (FLAM) at the origin of the B1 family in rodent genomes.

Y Quentin 1
PMCID: PMC523677  PMID: 8036148

Abstract

The question of the origin of the B1 family of rodents is addressed. The modern B1 elements are similar to the left Alu monomer, but with a 9 bp deletion and a 29 bp duplication. Search of databases for B1 elements that do not exhibit those modern features revealed sequence fragments that are very similar to the free left Alu monomers (FLAMs) described in the primate genomes. In addition, the analysis reveals elements that have 10 bp or 7 bp deletion in place of the 9 bp deletion but without the 29 bp tandem duplication. The elements described define families of proto B1 elements (referred as PB1, PB1D10 and PB1D7) that appeared before the first modern B1 element. A phylogenetic reconstruction suggest that the origin of Alu and B1 families took place before the divergence between the primate and the rodent lineages and that each family has followed different evolutionary routes since this radiation.

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Selected References

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