Dictyochophyceae Plastid Genomes Reveal Unusual Variability in Their Organization.
Dictyochophyceae
plastid genome
secondary endosymbiosis
stramenopiles
Journal
Journal of phycology
ISSN: 1529-8817
Titre abrégé: J Phycol
Pays: United States
ID NLM: 9882935
Informations de publication
Date de publication:
10 2019
10 2019
Historique:
received:
08
03
2019
accepted:
01
07
2019
pubmed:
22
7
2019
medline:
10
5
2020
entrez:
21
7
2019
Statut:
ppublish
Résumé
Dictyochophyceae (silicoflagellates) are unicellular freshwater and marine algae (Heterokontophyta, stramenopiles). Despite their abundance in global oceans and potential ecological significance, discovered in recent years, neither nuclear nor organellar genomes of representatives of this group were sequenced until now. Here, we present the first complete plastid genome sequences of Dictyochophyceae, obtained from four species: Dictyocha speculum, Rhizochromulina marina, Florenciella parvula and Pseudopedinella elastica. Despite their comparable size and genetic content, these four plastid genomes exhibit variability in their organization: plastid genomes of F. parvula and P. elastica possess conventional quadripartite structure with a pair of inverted repeats, R. marina instead possesses two direct repeats with the same orientation and D. speculum possesses no repeats at all. We also observed a number of unusual traits in the plastid genome of D. speculum, including expansion of the intergenic regions, presence of an intron in the otherwise non-intron-bearing psaA gene, and an additional copy of the large subunit of RuBisCO gene (rbcL), the last of which has never been observed in any plastid genome. We conclude that despite noticeable gene content similarities between the plastid genomes of Dictyochophyceae and their relatives (pelagophytes, diatoms), the number of distinctive features observed in this lineage strongly suggests that additional taxa require further investigation.
Banques de données
GENBANK
['AY043280.1', 'MK518352', 'MK518353', 'MK561359', 'MK561360', 'AB081639', 'AB081643', 'AB097409', 'AB280607', 'AF015573', 'AF015574', 'HQ710601', 'HQ710603']
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1166-1180Informations de copyright
© 2019 Phycological Society of America.
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