--- /dev/null
+[[!meta title="Evolutionary Insights from the Mitochondrial Genome of Oikopleura dioica: Sequencing Challenges, RNA Editing, Gene Transfers to the Nucleus, and tRNA Loss"]]
+[[!tag Oikopleura mitochondrion]]
+
+Klirs Y, Novosolov M, Gissi C, Garic R, Pupko T, Stach T, Huchon D.
+
+Genome Biol Evol. 2024 Aug 20:evae181. doi:10.1093/gbe/evae181
+
+Evolutionary Insights from the Mitochondrial Genome of Oikopleura dioica: Sequencing Challenges, RNA Editing, Gene Transfers to the Nucleus, and tRNA Loss.
+
+[[!pmid 39162337 desc="“the nad3 gene has been transferred to the nucleus and acquired a mitochondria-targeting signal“ Cs are occasionally found in edited poly-T regions."]]
[[Schulmeister, Schmid and Thompson, 2007|biblio/17333540]].
- Genome compaction in _Oikopleura_ and _Ciona_ have been reviewed in parallel
by [[Berná and Alvarez-Valin (2014)|biblio/25008364]].
- - Only a partial mitochondrial genome was reconstituted in [[Denoeud et al.,
- 2010|biblio/21097902]], due to cloning and sequencing difficulties that may
- have been caused by oligo-dT stretches. A/T-rich codons are more frequent than
- in human. In other tunicates, all mitochondrial genes are on the same DNA strand
- and 24 tRNAs are present, instead of 22 in other chordates (reviewed by [[Gissi and coll.,
- 2008|biblio/18612321]]).
- - The mitochondrial COI sequence AY116609 and the 18S rRNA sequence AB013014
- in Genbank are probably a contamination and a misidentification, respectively
- ([[Sakaguchi and coll., 2017|biblio/10.1007_s12562-017-1106-0]]).
- - [[Pichon, Luscombe and Plessy, 2019|biblio/32148763]] confirms that _O. dioica_'s
- mitochondrial sequences can be translated with the ascidian genetic code, and
- suggests that _O. lon_, _B. sty_ and perhaps _M. ery_ (all in the _Coecaria_ genus)
- use different code(s).
- Analysis of sex-linked markers supports genetic sex determination with male heterogamety –
that is: X chromosomes for females and Y for males. ([[Denoeud et al., 2010|biblio/21097902]])
- The major spliceosome is hypothethised to have evolved
pairwise non-coding conservation that “may have utility in the analysis of”
conserved non-coding elements in _Oikopleura_.
+Mitogenome
+----------
+
+ - A partial mitochondrial genome was reconstituted in [[Denoeud et al.,
+ 2010|biblio/21097902]], where edited oligo-dT stretches were discovered.
+ A/T-rich codons are more frequent than in human.
+ - Long-read mitochondrial assemblies confirmed the gene content (atp6, cob,
+ cox1, cox2, cox3, nad1, nad4, nad5 and a putative nad2 ORF), and showed
+ that the poly-T regions could contain Cs that do not interrupt editing
+ ([[Dierckxsens and coll, 2024|biblio/39162185]], [[Klirs et and coll., 2024|biblio/39162337]]).
+ - The _nad3_ gene was transferred to the nuclear genome ([[Klirs et and coll., 2024|biblio/39162337]]).
+ - In other tunicates, all mitochondrial genes are on the same DNA strand and 24
+ tRNAs are present, instead of 22 in other chordates (reviewed by [[Gissi and
+ coll., 2008|biblio/18612321]]).
+ - The mitochondrial COI sequence AY116609 and the 18S rRNA sequence AB013014
+ in Genbank are probably a contamination and a misidentification, respectively
+ ([[Sakaguchi and coll., 2017|biblio/10.1007_s12562-017-1106-0]]).
+ - [[Pichon, Luscombe and Plessy, 2019|biblio/32148763]] confirms that _O. dioica_'s
+ mitochondrial sequences can be translated with the ascidian genetic code, and
+ suggests that _O. lon_, _B. sty_ and perhaps _M. ery_ (all in the _Coecaria_ genus)
+ use different code(s).
+
Repeat elements
---------------