Environmental genomics points to non-diazotrophic <i>Trichodesmium</i> species abundant and widespread in the open ocean

To, Delmont

doi:10.1101/2021.03.24.436785

Cited by 2 publications

(2 citation statements)

References 80 publications

(110 reference statements)

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“…To our surprise, 7/8 Introner-containing taxonomic groups (all except pezizomycotina fungi) inhabit aquatic environments. To further explore aquatic diversity, we analyzed 520 partial genomes from aquatic organisms, representing 71 distinct genera ( 19 ) ( SI Appendix , Table 3 ). This revealed 25 additional Introner-containing taxonomic groups, yielding a total of 32 separate taxonomic groups.…”

Section: Resultsmentioning

confidence: 99%

Transposable elements drive intron gain in diverse eukaryotes

Gozashti

Roy

Thornlow

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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There is massive variation in intron numbers across eukaryotic genomes, yet the major drivers of intron content during evolution remain elusive. Rapid intron loss and gain in some lineages contrast with long-term evolutionary stasis in others. Episodic intron gain could be explained by recently discovered specialized transposons called Introners, but so far Introners are only known from a handful of species. Here, we performed a systematic search across 3,325 eukaryotic genomes and identified 27,563 Introner-derived introns in 175 genomes (5.2%). Species with Introners span remarkable phylogenetic diversity, from animals to basal protists, representing lineages whose last common ancestor dates to over 1.7 billion years ago. Aquatic organisms were 6.5 times more likely to contain Introners than terrestrial organisms. Introners exhibit mechanistic diversity but most are consistent with DNA transposition, indicating that Introners have evolved convergently hundreds of times from nonautonomous transposable elements. Transposable elements and aquatic taxa are associated with high rates of horizontal gene transfer, suggesting that this combination of factors may explain the punctuated and biased diversity of species containing Introners. More generally, our data suggest that Introners may explain the episodic nature of intron gain across the eukaryotic tree of life. These results illuminate the major source of ongoing intron creation in eukaryotic genomes.

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Section: Resultsmentioning

confidence: 99%

Transposable elements drive intron gain in diverse eukaryotes

Gozashti

Roy

Thornlow

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…To our surprise, 7/8 Introner-containing taxonomic groups (all except pezizomycotina fungi) inhabit aquatic environments. To further explore aquatic diversity, we analyzed 520 partial genomes representing 71 distinct genera ( 19 ) (Supplementary Table 3). This revealed 25 additional Introner-containing taxonomic groups, yielding a total of 33 separate taxonomic groups.…”

Section: Resultsmentioning

confidence: 99%

Transposable elements drive intron gain in diverse eukaryotes

Gozashti

Roy

Thornlow

et al. 2022

Preprint

View full text Add to dashboard Cite

There is massive variation in intron numbers across eukaryotic genomes, yet the major drivers of intron content during evolution remain elusive. Rapid intron loss and gain in some lineages contrasts with long term evolutionary stasis in others. Episodic intron gain could be explained by recently discovered specialized transposons called Introners, but so far introners are only known from a handful of species. Here, we performed a systematic search across 3,325 eukaryotic genomes and identified 27,563 Introner-derived introns in 175 genomes (5.2%). Species with introners span remarkable phylogenetic diversity, from animals to basal protists, representing lineages whose last common ancestor dates to over 1.7 billion years ago. Marine organisms were 6.5 times more likely to contain Introners than their terrestrial counterparts. Introners exhibit mechanistic diversity but most are consistent with DNA transposition, indicating that Introners have evolved convergently hundreds of times from autonomous transposable elements. Transposable elements and marine taxa are associated with high rates of horizontal gene transfer, suggesting that this combination of factors may explain the punctuated and biased diversity of species containing Introners. More generally our data suggest that Introners may explain the episodic nature of intron gain across the eukaryotic tree of life. These results illuminate the major source of ongoing intron creation in eukaryotic genomes.

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Environmental genomics points to non-diazotrophic Trichodesmium species abundant and widespread in the open ocean

Cited by 2 publications

References 80 publications

Transposable elements drive intron gain in diverse eukaryotes

Transposable elements drive intron gain in diverse eukaryotes

Transposable elements drive intron gain in diverse eukaryotes

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