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Organization and evolution of four differentially amplified tandem repeats in the Cucumis hystrix genome

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Abstract

Main conclusion

Three subtelomeric satellites and one interstitial 5S rDNA were characterized in Cucumis hystrix, and the pericentromeric signals of two C. hystrix subtelomeric satellites along C. sativus chromosomes supported the hypothesis of chromosome fusion in Cucumis.

Tandem repeats are chromosome structural fractions consisting of highly repetitive sequences organized in large tandem arrays in most eukaryotes. Differentiation of tandem repeats directly affects the chromosome structure, which contributes to species formation and evolution. Cucumis hystrix (2n = 2x = 24) is the only wild Cucumis species grouped into the same subgenus with C. sativus (2n = 2x = 14), hence its phylogenetic position confers a vital role for C. hystrix to understand the chromosome evolution in Cucumis. However, our knowledge of C. hystrix tandem repeats is insufficient for a detailed understanding of the chromosome evolution in Cucumis. Based on de novo tandem repeat characterization using bioinformatics and in situ hybridization (ISH), we identified and characterized four differentially amplified tandem repeats, Cucumis hystrix satellite 1–3 (CuhySat1–CuhySat3) located at the subtelomeric regions of all chromosomes, and Cucumis hystrix 5S (Cuhy5S) located at the interstitial regions of one single chromosome pair. Comparative ISH mapping using CuhySat1–3 and Cuhy5S revealed high homology of tandem repeats between C. hystrix and C. sativus. Intriguingly, we found signal distribution variations of CuhySat2 and CuhySat3 on C. sativus chromosomes. In comparison to their subtelomeric signal distribution on C. hystrix chromosomes, CuhySat3 showed a pericentromeric signal distribution and CuhySat2 showed both subtelomeric and pericentromeric signal distributions on C. sativus chromosomes. This detailed characterization of four C. hystrix tandem repeats significantly widens our knowledge of the C. hystrix chromosome structure, and the observed signal distribution variations will be helpful for understanding the chromosome evolution of Cucumis.

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Abbreviations

ISH:

In situ hybridization

FISH:

Fluorescence in situ hybridization

GISH:

Genome in situ hybridization

CuhySat:

Cucumis hystrix satellite

Cuhy5S:

Cucumis hystrix 5S

rDNA:

Ribosomal DNA

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Acknowledgements

This research was funded by the Natural Science Foundation of China (Nos. 31430075 and 31471872) and the National Key Research and Development Program of China (Nos. 2016YFD0101705 and 2016YFD0100204-25).

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Authors and Affiliations

  1. State Key Lab of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China

    Shuqiong Yang, Xiaodong Qin, Chunyan Cheng, Ziang Li, Qunfeng Lou, Ji Li & Jinfeng Chen

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  1. Shuqiong Yang
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  2. Xiaodong Qin
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Yang, S., Qin, X., Cheng, C. et al. Organization and evolution of four differentially amplified tandem repeats in the Cucumis hystrix genome. Planta 246, 749–761 (2017). https://doi.org/10.1007/s00425-017-2716-6

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