GENE ORDER IN MITOCHONDRIAL DNA AFFECTS THE ABUNDANCE OF THEIR TRANSCRIPTS (A CASE OF MARINE NEMATODES)

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Abstract

Mitochondrial genomes of most animals contain the same set of genes, with all or many protein-coding genes (PCGs) arranged in the same order, forming conserved blocks termed syntenies. Some syntenies have been preserved for hundreds of millions of years and are found in both vertebrates and invertebrates. This evolutionary conservation indicates a functional role for PCG arrangement; however, the biochemical and/or physiological mechanisms by which gene order in mtDNA affects viability are unknown. Among animals, there are taxa that have completely lost conserved syntenies in mtDNA. Canonical animal syntenies in mtDNA had not been reported in nematodes, until some were recently discovered in previously unstudied nematode taxa, including the marine family Thoracostomopsidae (Nematoda, Enoplida). We sequenced the complete mitochondrial genomes of three thoracostomopsid species, determined the gene order and their expression levels from RNA-seq data integrated for the family representatives in all available databases. It was found that six species of the Thoracostomopsidae reveal three distinct patterns of PCG arrangement, where relative mRNA levels correlate with gene order rather than species phylogeny. We hypothesize that the influence of PCG translocations on their expression levels underlies the long-term preservation of mitochondrial syntenies among animals.

About the authors

O. V Nikolaeva

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University

119234 Moscow, Russia

A. S Ovcharenko

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University; Lomonosov Moscow State University

119234 Moscow, Russia

P. V Khorkhordina

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University; Lomonosov Moscow State University

119234 Moscow, Russia

T. S Miroliubova

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University; Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences

119234 Moscow, Russia; 119071 Moscow, Russia

N. S Sadovskaya

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University

119234 Moscow, Russia

V. A Scobeyeva

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University; Lomonosov Moscow State University

119234 Moscow, Russia

N. P Sanamyan

Kamchatka Branch of the Pacific Institute of Geography, Far Eastern Branch of the Russian Academy of Sciences

683000 Petropavlovsk-Kamchatsky, Russia

E. G Panina

Zoological Institute, Russian Academy of Sciences

199034 Saint Petersburg, Russia

K. V Mikhailov

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University; Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences

119234 Moscow, Russia; 127051 Moscow, Russia

L. Yu Rusin

Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences

127051 Moscow, Russia

A. V Tchesunov

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University; Lomonosov Moscow State University

119234 Moscow, Russia

V. V Aleoshin

Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University; Lomonosov Moscow State University; Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences

Email: Aleshin@genebee.msu.su
Correspondence address 119234 Moscow, Russia; 127051 Moscow, Russia

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