Hoppel, a P-like element without introns: a P-element ancestral structure or a retrotranscription derivative? - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Molecular Biology and Evolution Year : 2003

Hoppel, a P-like element without introns: a P-element ancestral structure or a retrotranscription derivative?

Abstract

An in silico search for P-transposable-element-related sequences in the Drosophila melanogaster genome allowed us to detect sequences that are similar to P-element transposases. These sequences are located in the central region of 3.4-kb Hoppel elements, a class II transposon. Polymerase chain reaction (PCR) analysis of the insertional polymorphism revealed that these elements are mobile. The 3.4-kb elements are the longest copies of this family ever found. They contain an open reading frame that is long enough to encode a transposase, suggesting that the 3.4-kb elements are the full-length copies of the Hoppel family. Multiple alignments of several P-element transposases from different species and the Hoppel-element-encoded peptide showed that all of the P-element introns and the 5' region of the transposase are absent from the Hoppel sequence. Sequence analysis combined with reverse transcriptase PCR analysis showed that the 3.4-kb Hoppel elements are intronless. P and Hoppel not only share similar amino acid sequences but also have terminal inverted repeats of the same length (31 bp), and their excision footprints present a similar structure, which suggests that their transposases are functionally very similar. Thus, we propose that the Hoppel element family be included in the P-element superfamily. Two evolutionary scenarios are discussed considering the presence /absence of introns within the P-element superfamily.
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hal-02676873 , version 1 (31-05-2020)

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Daphné Reiss, Hadi Quesneville, Danielle Nouaud, Olivier Andrieu, Dominique Anxolabéhère. Hoppel, a P-like element without introns: a P-element ancestral structure or a retrotranscription derivative?. Molecular Biology and Evolution, 2003, 20 (6), pp.869-879. ⟨10.1093/molbev/msg090⟩. ⟨hal-02676873⟩
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