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Comparative mitogenomic analysis reveals variations and evolution of ectomycorrhizal fungal Strobilomyces

Summary

Scientists sequenced and analyzed the genetic material of five species of Strobilomyces mushrooms, which form important relationships with trees in forests. They discovered these mushrooms have relatively similar genetic blueprints with some regional variations in gene organization. Some species from Vietnam have slightly different gene arrangements than those from the USA, suggesting their evolutionary history is linked to geography. This research helps scientists better understand how these important fungi evolved and are related to other mushroom species.

Background

The genus Strobilomyces comprises ectomycorrhizal mushroom-forming fungi with significant ecological and economic roles. However, comprehensive descriptions of their mitochondrial genomes have been lacking. Mitogenomes serve as important molecular markers for understanding phylogenetic evolution in fungi.

Objective

This study aimed to assemble and analyze mitogenomes of five Strobilomyces species to uncover genetic characteristics, compare mitogenomes within the genus, and determine phylogenetic position within Boletales using mitochondrial protein-coding genes.

Results

Mitogenomes ranged from 35,618-42,088 bp with conserved 14 protein-coding genes, 2 rRNAs, and 24 tRNAs. All genes showed Ka/Ks ratios below 1.0 indicating purifying selection. Two gene rearrangement events were identified linked to geographical distribution. Phylogenetic analysis confirmed Strobilomyces relationships within Boletaceae.

Conclusion

This first comprehensive report of Strobilomyces mitogenomes reveals both conserved and variable features with geographical-linked gene rearrangements. The study provides valuable insights into fungal evolution within Boletales and establishes mitogenomes as important resources for fungal phylogenetics and systematics.
  • Published in:IMA Fungus,
  • Study Type:Genomic Comparative Analysis,
  • Source: PMID: 40052071, DOI: 10.3897/imafungus.16.141848
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