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Distribution of CR1-like transposable element in woodpeckers (Aves Piciformes): Z sex chromosomes can act as a refuge for transposable elements

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Abstract

Birds have relatively few repetitive sequences compared to other groups of vertebrates; however, the members of order Piciformes (woodpeckers) have more of these sequences, composed mainly of transposable elements (TE). The TE most often found in birds is a retrotransposon chicken repeat 1 (CR1). Piciformes lineages were subjected to an expansion of the CR1 elements, carrying a larger fraction of transposable elements. This study compared patterns of chromosome distribution among five bird species, through chromosome mapping of the CR1 sequence and reconstructed their phylogenetic tree. We analyzed several members of Piciformes (Colaptes campestris, Colaptes melanochloros, Melanerpes candidus, and Veniliornis spilogaster), as well as Galliformes (Gallus gallus). Gallus gallus is the species with which most genomic and hence cytogenetic studies have been performed. The results showed that CR1 sequences are a monophyletic group and do not depend on their hosts. All species analyzed showed a hybridization signal by fluorescence in situ hybridization (FISH). In all species, the chromosomal distribution of CR1 was not restricted to heterochromatin regions in the macrochromosomes, principally pair 1 and the Z sex chromosome. Accumulation in the Z sex chromosomes can serve as a refuge for transposable elements. These results highlight the importance of transposable elements in host genomes and karyotype evolution.

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Abbreviations

CCA:

Colaptes campestris

CME:

Colaptes melanochloros

CR1:

Chicken repeat 1

FISH:

Fluorescent in situ hybridization

GGA:

Gallus gallus

LINE:

Long interspersed nucleotide elements

MCA:

Melanerpes candidus

ORF:

Open reading frames

PCR:

Polymerase chain reaction

PPU:

Picoides pubescens

RT:

Reverse transcriptase

TEs:

Transposable elements

VSP:

Veniliornis spilogaster

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Acknowledgments

The authors are grateful to Dr. Rafael Kretschmer for his inspiring comments on the manuscript and to the anonymous reviewers for their valuable comments to improve the manuscript.

Funding

CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) provided financial support.

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Authors and Affiliations

Authors

Contributions

NAB and TDO conceived, designed research most of the experiments and contributed to the interpretation of results. NAB and TDO wrote the manuscript. NAB and RLBC did the in silico experiments. AVG and FPT supervised the project. NAB, TDO, RJG, AVG, CM and FPT performed research. NAB and TDO contributed equal. All authors read and approved the manuscript.

Corresponding author

Correspondence to Natasha Avila Bertocchi.

Ethics declarations

The experiments followed protocols approved by the Ethics Committee on the Use of Animals (CEUA – Universidade Federal do Pampa, 026/2012).

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Responsible Editor: Rachel O’Neill

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Bertocchi, N.A., de Oliveira, T.D., del Valle Garnero, A. et al. Distribution of CR1-like transposable element in woodpeckers (Aves Piciformes): Z sex chromosomes can act as a refuge for transposable elements. Chromosome Res 26, 333–343 (2018). https://doi.org/10.1007/s10577-018-9592-1

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  • DOI: https://doi.org/10.1007/s10577-018-9592-1

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