Giant Fern Genomes Show Complex Evolution Patterns: A Comparative Analysis in Two Species of Tmesipteris (Psilotaceae)

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. is a sm...

Full description

Saved in:
Bibliographic Details
Published in:International journal of molecular sciences 2023-01, Vol.24 (3), p.2708
Main Authors: Fernández, Pol, Leitch, Ilia J, Leitch, Andrew R, Hidalgo, Oriane, Christenhusz, Maarten J M, Pokorny, Lisa, Pellicer, Jaume
Format: Article
Language:English
Subjects:
Angiosperms
Chromosomes
Comparative analysis
DNA, Plant - genetics
Evolution
Evolution, Molecular
Ferns
Ferns - genetics
Genome, Plant
Genomes
Genomics
Genomics - methods
Gymnosperms
Heterogeneity
Magnoliopsida - genetics
Nucleotide sequence
Phylogeny
Polyploidy
Regression analysis
Repetitive Sequences, Nucleic Acid
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. 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, (1C = 73.19 Gbp) and (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 , to determine if the structures observed here are an emergent property of massive genomic inflation or derived from lineage specific processes.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms24032708