Giant Fern Genomes Show Complex Evolution Patterns: A Comparative Analysis in Two Species of Tmesipteris (Psilotaceae).
Name
ijms-24-02708.pdf
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1.62 MB
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Resource type
Journal article
Date published
January 31, 2023
Abstract
Giant genomes are rare across the plant kingdom and their study has focused almost exclusively on angiosperms and gymnosperms. The scarce genetic data that are available for ferns, however, indicate differences in their genome organization and a lower dynamism compared to other plant groups. Tmesipteris is a small genus of mainly epiphytic ferns that occur in Oceania and several Pacific Islands. So far, only two species with giant genomes have been reported in the genus, T. tannensis (1C = 73.19 Gbp) and T. obliqua (1C = 147.29 Gbp). Low-coverage genome skimming sequence data were generated in these two species and analyzed using the RepeatExplorer2 pipeline to identify and quantify the repetitive DNA fraction of these genomes. We found that both species share a similar genomic composition, with high repeat diversity compared to taxa with small (1C < 10 Gbp) genomes. We also found that, in general, characterized repetitive elements have relatively high heterogeneity scores, indicating ancient diverging evolutionary trajectories. Our results suggest that a whole genome multiplication event, accumulation of repetitive elements, and recent activation of those repeats have all played a role in shaping these genomes. It will be informative to compare these data in the future with data from the giant genome of the angiosperm Paris japonica, to determine if the structures observed here are an emergent property of massive genomic inflation or derived from lineage specific processes.
Project(s)
Priority 2: Trait Diversity and Function
Funder
| Funder name | Awards |
Consejo Superior de Investigaciones Científicas, Spain | (PID2019-108173GA-I00) funded by MCIN/AEI/ 10.13039/501100011033 |
Spanish Ministry of Universities, Spain | Ramón y Cajal grant (Ref: RYC-2017-2274) funded by MCIN/AEI/10.13039/501100011033 - FPU21/03564 |
European Social Fund, European Union | ESF Investing in your future |
Journal title
International Journal of Molecular Sciences
Volume
24
Issue
3
Article number
2708
Publisher
MDPI AG
Place of publication
Basel, Switzerland
eISSN
1422-0067
Date accepted
January 27, 2023
Official URL
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In Copyright
Additional information
IF = 5.542 (2022-2023) ; This article belongs to the Special Issue State-of-the-Art Molecular Plant Biology Research in Spain.