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Oligo-FISH barcode in beans: a new chromosome identification system

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Abstract

Key message

An Oligo-FISH barcode system was developed for two model legumes, allowing the identification of all cowpea and common bean chromosomes in a single FISH experiment, and revealing new chromosome rearrangements. The FISH barcode system emerges as an effective tool to understand the chromosome evolution of economically important legumes and their related species.

Abstract

Current status on plant cytogenetic and cytogenomic research has allowed the selection and design of oligo-specific probes to individually identify each chromosome of the karyotype in a target species. Here, we developed the first chromosome identification system for legumes based on oligo-FISH barcode probes. We selected conserved genomic regions between Vigna unguiculata (Vu, cowpea) and Phaseolus vulgaris (Pv, common bean) (diverged ~ 9.7–15 Mya), using cowpea as a reference, to produce a unique barcode pattern for each species. We combined our oligo-FISH barcode pattern with a set of previously developed FISH probes based on BACs and ribosomal DNA sequences. In addition, we integrated our FISH maps with genome sequence data. Based on this integrated analysis, we confirmed two translocation events (involving chromosomes 1, 5, and 8; and chromosomes 2 and 3) between both species. The application of the oligo-based probes allowed us to demonstrate the participation of chromosome 5 in the translocation complex for the first time. Additionally, we detailed a pericentric inversion on chromosome 4 and identified a new paracentric inversion on chromosome 10. We also detected centromere repositioning associated with chromosomes 2, 3, 5, 7, and 9, confirming previous results for chromosomes 2 and 3. This first barcode system for legumes can be applied for karyotyping other Phaseolinae species, especially non-model, orphan crop species lacking genomic assemblies and cytogenetic maps, expanding our understanding of the chromosome evolution and genome organization of this economically important legume group.

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Data availability

All data generated or analyzed during this study are included as supplementary materials.

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Acknowledgements

We thank Embrapa Meio-Norte (Teresina, Piauí, Brazil) and Embrapa Cenargen (Brasília, Distrito Federal, Brazil) for providing the V. unguiculata and P. vulgaris seeds, respectively. We thank CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) Grant No. 421968/2018-4, 313527/2017-2, 310804/2017-5, 433931/2018-3, and 442019/2019-0, and FACEPE (Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco) Grant No. APQ-0390-2.02/19 for the financial support. We also thank CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Financial Code 001), and FACEPE for the scholarships.

Funding

This work was supported by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) Grant No. 421968/2018-4, 313527/2017-2, 310804/2017-5, 433931/2018-3, and 442019/2019-0, and FACEPE (Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco) Grant No. APQ-0390-2.02/19.

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Authors and Affiliations

Authors

Contributions

FOB: designed oligo system, provided resources for the oligo-FISH experiments and wrote the paper. THN: conducted oligo-FISH experiments, analyzed the sequence synteny data, constructed Circos images and wrote the paper. CCMJ: analyzed the sequence synteny data, constructed the Circos images and helped writing the paper. SD: conducted the oligo-FISH experiments and analyzed the sequence synteny data. LVM: analyzed and processed the oligo-FISH images and helped writing the paper. GTB: labeled the oligo-FISH probes. AMBI: discussed the results. JJ: discussed the results and provided resources for the oligo probe labeling. APH: designed this research, wrote the manuscript, discussed the results and provided resources for the oligo-FISH experiments. ACBV: designed this research, the images, wrote the manuscript and discussed the results. All authors read and approved the final version of the paper.

Corresponding authors

Correspondence to Andrea Pedrosa-Harand or Ana Christina Brasileiro-Vidal.

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The authors declare no conflicts of interest.

Additional information

Communicated by P. Heslop-Harrison.

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Supplementary Information

Below is the link to the electronic supplementary material.

122_2021_3921_MOESM1_ESM.xlsx

Genomic positions of oligo barcode and BAC markers in the reference genome of Vigna unguiculata (Vu) showing the scores of BLAST search, as well as the positions in bp. a Total size and centromere regions by Lonardi et al. (2019). b BACs from V. unguiculata were previous used by Oliveira et al. (2020) and do Vale Martins et al. (2021) and are available at HarvEST:cowpea (harvest.ucr.edu). The color of each chromosome marker was defined in accordance with Fig. 2 description. (XLSX 21 KB)

122_2021_3921_MOESM2_ESM.xlsx

Genomic positions of oligo barcode and BAC markers in the reference genome of Phaseolus vulgaris (Pv) showing the scores of BLAST search, as well as the positions in bp. Genomic positions of oligo barcode and BAC markers in the reference genome of Phaseolus vulgaris (Pv) showing the scores of BLAST search, as well as the positions in bp. a Total size and centromere regions by Schmutz et al. (2014). c Gene markers ID and accessions for BAC sequences available at NCBI GenBank and EMBL-EBI. The color of each chromosome marker was defined in accordance with Fig. 2 description. (XLSX 21 KB)

122_2021_3921_MOESM3_ESM.xlsx

Chromosome positions of oligo barcode and BAC markers on Vigna unguiculata idiogram. Total chromosome size and position of centromere in bp are also indicated. The color of each chromosome marker was defined in accordance with Fig. 2 description. (XLSX 19 KB)

122_2021_3921_MOESM4_ESM.xlsx

Chromosome positions of oligo barcode and BAC markers on Phaseolus vulgaris idiogram. Total chromosome size and position of centromere in bp are also indicated. The color of each chromosome marker was defined in accordance with Fig. 2 description. (XLSX 19 KB)

122_2021_3921_MOESM5_ESM.pdf

Sequences of the green oligo set used for oligo-FISH of V. unguiculata and P. vulgaris chromosomes. The sequences were selected using the reference genome of V. unguiculata ‘IT97K-499-35’ (Lonardi et al. 2019), based on regions conserved in P. vulgaris (Schmutz et al. 2014) (PDF 8332 KB)

122_2021_3921_MOESM6_ESM.pdf

Sequences of the red oligo set used for oligo-FISH of V. unguiculata and P. vulgaris chromosomes. The sequences were selected using the reference genome of V. unguiculata ‘IT97K-499-35’ (Lonardi et al. 2019), based on regions conserved in P. vulgaris (Schmutz et al. 2014) (PDF 8148 KB)

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de Oliveira Bustamante, F., do Nascimento, T.H., Montenegro, C. et al. Oligo-FISH barcode in beans: a new chromosome identification system. Theor Appl Genet 134, 3675–3686 (2021). https://doi.org/10.1007/s00122-021-03921-z

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  • DOI: https://doi.org/10.1007/s00122-021-03921-z

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