DNA insertions as a component of the evolution of unique satellite DNA families in two genera of parasitoid wasps: Diadromus and Eupelmus (Hymenoptera) |
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Authors: | Rojas-Rousse D; Bigot Y; Periquet G |
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Institution: | Institut de Biocenotique Experimentale des Agrosystemes, Universite Francois Rabelais, Tours, France. |
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Abstract: | In the two parasitoid wasps, Diadromus collaris and Eupelmus orientalis,
the satellite DNAs were each found to consist wholly or largely of a single
family (5%-7% of the genome). Several clones of each family were obtained
and sequenced. The repeat unit in each species is characterized by both the
repetition of a basic motif and the presence of an inserted sequence.
Sequence comparisons with satellite DNA from D. pulchellus and E. vuilleti
provide plausible scenarios for the evolution of the satellite DNA in each
genus. Palindromes and A-rich tracts in each consensus sequence suggest the
formation, in vivo, of hairpin structures and bend centers that may play a
role in heterochromatin condensation in insects. The insertions in the
repeat units of each species also contain these structural features,
suggesting that maintenance of these insertions requires constraints
similar to those pertaining to the rest of the satellite- DNA unit.
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