The evolutionary history of Drosophila buzzatii. XXXVI. Molecular structural analysis of Osvaldo retrotransposon insertions in colonizing populations unveils drift effects in founder events.

ABSTRACT: Previous work on transposable element distribution in colonizing populations of Drosophila buzzatii revealed a high frequency of occupancy in several chromosomal sites. Two explanatory hypotheses were advanced: the founder hypothesis, by which founder genetic drift was responsible, and the unstable hypothesis that assigns this unusual distribution to bursts of transposition toward some chromosomal sites. Here, we study the molecular structure of three euchromatic Osvaldo clones isolated from sites occupied at high (A4 and B9) and low frequency (B4) in colonizing populations, to test these hypotheses. Large insertions, duplications, and indels in the Osvaldo coding region and LTR were detected in the A4 clone and a truncated Osvaldo with many substitutions was found in the B9 clone. These a

SUBMITTER: Garcia Guerreiro MP 

PROVIDER: S-EPMC1775019 | biostudies-literature | 2007 Jan

REPOSITORIES: biostudies-literature