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Comparative analysis of repetitive DNA in dysploid and non-dysploid Phaseolus beans

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Abstract

Structural karyotype changes result from ectopic recombination events frequently associated with repetitive DNA. Although most Phaseolus species present relatively stable karyotypes with 2n = 22 chromosomes, the karyotypes of species of the Leptostachyus group show high rates of structural rearrangements, including a nested chromosome fusion that led to the dysploid chromosome number of the group (2n = 20). We examined the roles of repetitive landscapes in the rearrangements of species of the Leptostachyus group using genome-skimming data to characterize the repeatome in a range of Phaseolus species and compared them to species of that group (P. leptostachyus and P. macvaughii). LTR retrotransposons, especially the Ty3/gypsy lineage Chromovirus, were the most abundant elements in the genomes. Differences in the abundance of Tekay, Retand, and SIRE elements between P. macvaughii and P. leptostachyus were reflected in their total amounts of Ty3/gypsy and Ty1/copia. The satellite DNA fraction was the most divergent among the species, varying both in abundance and distribution, even between P. leptostachyus and P. macvaughii. The rapid turnover of repeats in the Leptostachyus group may be associated with the several rearrangements observed.

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Data availability

Sequencing data generated during this study are available on the NCBI SRA platform (BioProject number PRJNA865793) under the following accession numbers: SAMN30133279 (Phaseolus leptostachyus), SAMN30133280 (P. macvaughii), and SAMN30133281 (P. lunatus). New satellite DNA sequences are available under the following accession numbers: BankIt2739180 OR500523 to OR500540.

Code availability

Not applicable.

Abbreviations

CD:

Chromodomain

DAPI:

4′,6-Diamidino-2-phenylindole

dNTP:

Deoxynucleotide triphosphates

FISH:

Fluorescence in situ hybridization

LINE:

Long interspersed nuclear elements

LTR:

Long terminal repeats

Mya:

Million years ago

NCF:

Nested chromosome fusion

PCR:

Polymerase chain reaction

PTD:

Putative target domains

satDNA:

Satellite DNA

SINE:

Short interspersed nuclear elements

SSC:

Saline-sodium citrate

TAREAN:

TAndem REpeat ANalyzer

TBT:

Trehalose, bovine serum albumin (BSA), and polysorbate-20 (Tween-20)

TNT:

Tree analysis using New Technology

References 

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Acknowledgements

The authors are grateful to EMBRAPA CENARGEN and EMBRAPA Arroz e Feijão (Brazil), CIAT (Colômbia), and IPK Gatersleben (Germany), for providing seed material. We are also grateful to CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brazil) for financial support.

Funding

This study was supported by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil) through a fellowship awarded to A. Pedrosa-Harand (312694/2021–0) and was supported in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brazil (CAPES, Finance Code 001).

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Contributions

MEF performed experiments, and drafted the manuscript. TR and MAS performed bioinformatic analyses and discussed the data. TN performed experiments and bioinformatic analyses and organized figures. APH designed and supervised the research and corrected the manuscript. All authors read, discussed, and approved the final version of the manuscript.

Corresponding author

Correspondence to Andrea Pedrosa-Harand.

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Competing interests

The authors declare no competing interests.

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Responsible Editor: Rachel O'Neill

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Key message

The bioinformatic and cytogenetic characterization of the repeatome of 13 accessions of 11 Phaseolus species revealed rapid turnovers and distribution changes in some LTR-retrotransposon lineages and satellite DNA families in the Leptostachyus group, which experienced extensive rearrangements after a dysploidy event.

Supplementary Information

Below is the link to the electronic supplementary material.

10577_2023_9739_MOESM1_ESM.tif

Supplementary Figure 1. New genome size estimates of Phaseolus species by flow cytometry. A) P. microcarpus; B) P. dumosus. Solanum lycopersicum var. Stupicke was used as an internal standard. (TIF 3774 KB)

10577_2023_9739_MOESM2_ESM.tif

Supplementary Figure 2. Dotplot analysis of newly identified and shared satDNAs from individual analyses of P. macvaughii, P. leptostachyus and P. lunatus using TAREAN, compared to khipu. (TIF 5901 KB)

10577_2023_9739_MOESM3_ESM.tif

Supplementary Figure 3. Monomer sequence alignments of newly identified and shared satDNAs from individual analyses of P. macvaughii, P. leptostachyus and P. lunatus using TAREAN, compared to khipu. A) PleSAT592 and PmaSAT647; B) khipu consensus from P. vulgaris compared to khipu variants with 548 bp, 549 bp and 558 bp; C) PleSAT572 and PluSAT940 compared to PmiSAT30. (TIF 19262 KB)

10577_2023_9739_MOESM4_ESM.tif

Supplementary Figure 4. Complex organization of PluSAT940 with insertions of PmiSAT30-like repeats. The percentage values represent the similarity among the variations of PmiSAT30 sequence with the monomer consensus. (TIF 10324 KB)

10577_2023_9739_MOESM5_ESM.tif

Supplementary Figure 5. Chromosomal localization of satDNA families in P. macvaughii showing very weak dispersed signals. (a-b), PleSAT752, (c-d) khipu. Bar in d = 5 µm. (TIF 3103 KB)

Supplementary file 6. Supplementary Tables 1–4. (DOCX 78 KB)

10577_2023_9739_MOESM7_ESM.docx

Supplementary file 7. Supplementary Data 1. Monomers consensus sequences of satDNAs identified either in individual or comparative clustering analysis in Phaseolus species using Repeat Explorer. (DOCX 23 KB)

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Ferraz, M.E., Ribeiro, T., Sader, M. et al. Comparative analysis of repetitive DNA in dysploid and non-dysploid Phaseolus beans. Chromosome Res 31, 30 (2023). https://doi.org/10.1007/s10577-023-09739-3

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  • DOI: https://doi.org/10.1007/s10577-023-09739-3

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