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The mobilome of Drosophila incompta, a flower-breeding species: comparison of transposable element landscapes among generalist and specialist flies

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Abstract

The Drosophila genus is one of the main model organisms in evolutionary studies, including those investigating the role of transposable elements (TE) in genomic evolution both at the nucleotide and chromosome levels. D. incompta is a species with restricted ecology, using Cestrum (Solanaceae) flowers as unique sources for oviposition, feeding and development. In the present study, we deeply characterise the D. incompta mobilome and generate a curated dataset. A total of 277 elements were identified, corresponding to approximately 14% of the genome, and 164 of these elements are new, of which 32.62% are putatively autonomous and 8.9% are transcriptionally active in adult flies. The restricted ecology does not seem to influence the dynamics of TE in this fly, since the proportion and diversity of TEs in its genome are similar to that of other Drosophila species. This result is reinforced by the absence of a clear pattern when comparing the TE landscape between generalist and specialist flies. Using 32 available Drosophila genomes—24 ecologically generalist species and 8 specialist species—no difference was found between their TE landscape patterns. However, differences were found between species of the Sophophora and Drosophila subgenus, indicating there are lineage-specific factors shaping TE landscapes.

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Abbreviations

TE:

Transposable elements

bp:

Base pairs

PA:

Putative autonomous

PNA:

Putative non-autonomous

DG:

Degenerated

TIRs:

Terminal inverted repeats

LTRs:

Long terminal repeats

TSD:

Target site duplication

ORF:

Open reading frame

K2P:

Kimura two parameters

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Acknowledgements

We are grateful to Dr. Lizandra Robe and two anonymous reviewers for suggestions.

Funding

This study was supported by research grants and fellowships from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Pronex-Fapergs (16/2551—0000 499-4).

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Authors and Affiliations

Authors

Contributions

PMF and EL conceived and designed research. PMF, RMD and GLW conducted experiments and analysed data. PMF, GLW and EL wrote the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Elgion L. S. Loreto.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Responsible Editor:Rachel O'Neill

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Electronic supplementary material

Supplementary Material 1:

A comparison of TE landscapes between specialist and generalist Drosophila. A table (Supplementary Table A) showing all the species used in the phylogenetic and landscape analyses with niche discrimination and group identification. (DOC 54 kb)

Supplementary Table S1:

Spreadsheet showing all the D. incompta annotated TEs. Each sheet corresponds to one superfamily. (XLSX 466 kb)

Supplementary Table S2:

Spreadsheet showing all the genes used in the phylogenetic and HTT (VHICA) analyses along with their accession codes and sequences. (XLSX 71 kb)

Supplementary Table S3:

Statistical data of both genome and transcriptome draft assemblies. (XLSX 5 kb)

Supplementary Table S4:

Spreadsheet containing the results of the homology search (BLASTn) of the all annotated D. incompta TEs against the D. incompta transcriptome draft. In this analysis the following threshold values were used: a) percentage of identity of query (annotated TEs) and subject (transcriptome draft scaffolds) = 84%; b) minimum alignment length = 100 bp; c) maximum number of base mismatches per alignment = 10; and d) maximum number of gaps per alignment = 5. (XLSX 12 kb)

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Fonseca, P.M., Moura, R.D., Wallau, G.L. et al. The mobilome of Drosophila incompta, a flower-breeding species: comparison of transposable element landscapes among generalist and specialist flies. Chromosome Res 27, 203–219 (2019). https://doi.org/10.1007/s10577-019-09609-x

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  • DOI: https://doi.org/10.1007/s10577-019-09609-x

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