Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 172, Issue -, Pages 560-572Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.01.087
Keywords
Mitochondrial genome; Protein coding gene; Evolution; Repeat sequence; Gene rearrangement; Phylogeny
Funding
- Project of Protection, Breeding and High Value Utilization of Plateau Characteristic Edible Fungi Resources [2019ZG00906]
- Project of Analysis of Species Diversity and Ecological Adaptation Mechanism of Boletales Based on Mitochondrial Genome [2019ZG00909-04]
- Outstanding Youth Fund of Sichuan Province [2019JDJQ0034]
- Talent Fund of Sichuan Academy of Agricultural Sciences [2019QYXK003]
- Foundation for Young Scholars of Sichuan Academy of Agricultural Sciences [2018QNJJ-025]
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The present study assembled and compared eleven novel complete mitogenomes of Boletus, revealing differences in gene arrangement and evolution rates among Boletus species. The study also found a close relationship between Boletus species and Paxillus in the phylogenetic tree of 72 Agaricomycetes.
In the present study, eleven novel complete mitogenomes of Boletus were assembled and compared. The eleven complete mitogenomes were all composed of circular DNA molecules, with sizes ranging from 32,883 bp to 48,298 bp. The mitochondrial gene arrangement of Boletus varied greatly from other Boletales mitogenomes, and gene position reversal were observed frequently in the evolution of Boletus. Across the 15 core protein-coding genes (PCGs) tested, atp9 had the least and rps3 had the largest genetic distances among the eleven Boletus species, indicating varied evolution rates of core PCGs. In addition, the Ka/Ks value for nad3 gene was >1, suggesting that this gene was subject to possible positive selection pressure. Comparative mitogenomic analysis indicated that the intronic region was significantly correlated with the size of mitogenomes in Boletales. Two large-scale intron loss events were detected in the evolution of Boletus. Phylogenetic analyses based on a combined mitochondrial gene dataset yielded a well-supported (BPP >= 0.99; BS -100) phylogenetic tree for 72 Agaricomycetes, and the Boletus species had a close relationship with Paxillus. This study served as the first report on complete mitogenomes in Boletus, which will further promote investigations of the genetics, evolution and phylogeny of the Boletus genus. (C) 2021 Published by Elsevier B.V.
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