NDLI: Diversity of transcripts and transcript processing forms in plastids of the dinoflagellate alga Karenia mikimotoi

Content Provider	Springer Nature Link
Author	Dorrell, Richard G. Hinksman, George A. Howe, Christopher J.
Copyright Year	2015
Abstract	Plastids produce a vast diversity of transcripts. These include mature transcripts containing coding sequences, and their processing precursors, as well as transcripts that lack direct coding functions, such as antisense transcripts. Although plastid transcriptomes have been characterised for many plant species, less is known about the transcripts produced in other plastid lineages. We characterised the transcripts produced in the fucoxanthin-containing plastids of the dinoflagellate alga Karenia mikimotoi. This plastid lineage, acquired through tertiary endosymbiosis, utilises transcript processing pathways that are very different from those found in plants and green algae, including 3′ poly(U) tail addition, and extensive substitutional editing of transcript sequences. We have sequenced the plastid transcriptome of K. mikimotoi, and have detected evidence for divergent evolution of fucoxanthin plastid genomes. We have additionally characterised polycistronic and monocistronic transcripts from two plastid loci, psbD-tRNA $^{ Met }$-ycf4 and rpl36-rps13-rps11. We find evidence for a range of transcripts produced from each locus that differ in terms of editing state, 5′ end cleavage position, and poly(U) tail addition. Finally, we identify antisense transcripts in K. mikimotoi, which appear to undergo different processing events from the corresponding sense transcripts. Overall, our study provides insights into the diversity of transcripts and processing intermediates found in plastid lineages across the eukaryotes.
Starting Page	233
Ending Page	247
Page Count	15
File Format	PDF
ISSN	01674412
Journal	Plant Molecular Biology
Volume Number	90
Issue Number	3
e-ISSN	15735028
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-01-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	RNA processing Haptophytes Transcript processing Endosymbiotic gene transfer Chloroplast evolution Plant Sciences Biochemistry Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Agronomy and Crop Science

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Diversity of transcripts and transcript processing forms in plastids of the dinoflagellate alga Karenia mikimotoi

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