Molecular Biology and Evolution, Vol 14, 1132-1144, Copyright © 1997 by Society for Molecular Biology and Evolution
D Nouaud and D Anxolabehere
Functional P transposable elements can be separated into two distinct
classes: mobile elements, which present the canonical structure, with
transposase and repressor functions, and immobile P sequences truncated in
5' and 3' by loss of the terminal inverted repeats and exon 3, which retain
only the repressor function. This second class was first described in some
species of the Drosophila obscura group. Here, we describe a new truncated
immobile P sequence cloned from one species of the Drosophila montium
subgroup (D. tsacasi) that produces a polyadenylated RNA with a coding
capacity for a 66-kDa "repressor-like" protein. The results from a number
of different comparisons between P- homologous sequences concerning both
coding and noncoding regions strongly suggest that the obscura and montium
immobile P sequences as well as the T-type P subfamily derive from the same
ancestral mobile P element family. Study of the flanking regions of these
immobile P sequences shows that the two immobilizations were produced by
two independent events. Our results provide evidence that the molecular
domestication of a transposable element family may recur in a species
lineage.
ORIGINAL ARTICLE
P element domestication: a stationary truncated P element may encode a 66-kDa repressor-like protein in the Drosophila montium species subgroup
Departement Dynamique du Genome et Evolution, Institut Jacques Monod, CNRS-Universite Denis Diderot, Paris, France.
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