A population specific mitochondrial intron from the sponge Phakellia robusta in the North-East Atlantic

Cranston, Alex; Taboada, Sergi; Koutsouveli, Vasiliki; Schuster, Astrid; Riesgo, Ana

doi:10.1016/j.dsr.2021.103534

Cited by 2 publications

(2 citation statements)

References 40 publications

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“…However, much evidence points to intron insertion via HGT from microbial or algal donors. In sponges, putative intron donors include fungi 16 , 21 , 22 , rhodophytes, diatoms and raphidophytes 20 . Additionally, placozoans have been proposed as possible intron donors in sponges 20 , 21 .…”

Section: Resultsmentioning

confidence: 99%

“…Although typically not found in metazoans, both intron types have been recorded in the mitogenomes of non-bilaterian phyla Porifera 16 – 22 and Placozoa 23 – 26 , whereas Cnidaria are only known to harbour Group I introns 27 – 29 . Conversely, in bilaterians, mitogenome introns are apparently very rare, but Group II introns have been recognised in the cox1 gene of annelids Nephtys (Phyllodocida) 30 , Glycera fallax , G. unicornis (Phyllodocida) 31 , Decemunciger sp.…”

Section: Introductionmentioning

confidence: 99%

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Unprecedented frequency of mitochondrial introns in colonial bilaterians

Jenkins

Graham

Porter

et al. 2022

Sci Rep

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Animal mitogenomes are typically devoid of introns. Here, we report the largest number of mitochondrial introns ever recorded from bilaterian animals. Mitochondrial introns were identified for the first time from the phylum Bryozoa. They were found in four species from three families (Order Cheilostomatida). A total of eight introns were found in the complete mitogenome of Exechonella vieirai, and five, 17 and 18 introns were found in the partial mitogenomes of Parantropora penelope, Discoporella cookae and Cupuladria biporosa, respectively. Intron-encoded protein domains reverse transcriptase and intron maturase (RVT-IM) were identified in all species. Introns in E. vieirai and P. penelope had conserved Group II intron ribozyme domains V and VI. Conserved domains were lacking from introns in D. cookae and C. biporosa, preventing their further categorization. Putative origins of metazoan introns were explored in a phylogenetic context, using an up-to-date alignment of mitochondrial RVT-IM domains. Results confirmed previous findings of multiple origins of annelid, placozoan and sponge RVT-IM domains and provided evidence for common intron donor sources across metazoan phyla. Our results corroborate growing evidence that some metazoans with regenerative abilities (i.e. placozoans, sponges, annelids and bryozoans) are susceptible to intron integration, most likely via horizontal gene transfer.

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