The mitochondrial genome of the glomeromycete Rhizophagus sp. DAOM 213198 reveals an unusual organization consisting of two circular chromosomes.

Abstract:

:Mitochondrial (mt) genomes are intensively studied in Ascomycota and Basidiomycota, but they are poorly documented in basal fungal lineages. In this study, we sequenced the complete mtDNA of Rhizophagus sp. DAOM 213198, a close relative to Rhizophagus irregularis, a widespread, ecologically and economical relevant species belonging to Glomeromycota. Unlike all other known taxonomically close relatives harboring a full-length circular chromosome, mtDNA of Rhizophagus sp. reveals an unusual organization with two circular chromosomes of 61,964 and 29,078 bp. The large chromosome contained nine protein-coding genes (atp9, nad5, cob, nad4, nad1, nad4L, cox1, cox2, and atp8), small subunit rRNA gene (rns), and harbored 20 tRNA-coding genes and 10 orfs, while the small chromosome contained five protein-coding genes (atp6, nad2, nad3, nad6, and cox3), large subunit rRNA gene (rnl) in addition to 5 tRNA-coding genes, and 8 plasmid-related DNA polymerases (dpo). Although structural variation of plant mt genomes is well documented, this study is the first report of the presence of two circular mt genomes in arbuscular mycorrhizal fungi. Interestingly, the presence of dpo at the breakage point in intergenes cox1-cox2 and rnl-atp6 for large and small mtDNAs, respectively, could be responsible for the conversion of Rhizophagus sp. mtDNA into two chromosomes. Using quantitative real-time polymerase chain reaction, we found that both mtDNAs have an equal abundance. This study reports a novel mtDNA organization in Glomeromycota and highlights the importance of studying early divergent fungal lineages to describe novel evolutionary pathways in the fungal kingdom.

journal_name

Genome Biol Evol

authors

Nadimi M,Stefani FO,Hijri M

doi

10.1093/gbe/evu268

subject

Has Abstract

pub_date

2014-12-19 00:00:00

pages

96-105

issue

1

issn

1759-6653

pii

evu268

journal_volume

7

pub_type

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