期刊
FRONTIERS IN MICROBIOLOGY
卷 12, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2021.679894
关键词
apiculate yeast; new species; phylogenomics; OGRI; gene loss; speciation; domestication
类别
资金
- Slovenian Research Agency [P4-0116, IP-0510]
- Republic of Slovenia Ministry of Education, Science and Sport [C3330-19-952047]
- European Union European Regional Development Fund
- CONICET [PIP11220130100392CO]
- Universidad Nacional del Comahue [B199]
- National Science Foundation [DEB-1442148]
- Great Lakes Bioenergy Research Center, US. Department of Energy, Office of Science, Office of Biological and Environmental Research [DE-SC0018409]
- USDA National Institute of Food and Agriculture (Hatch Project) [1020204]
- Pew Charitable Trusts
- Wisconsin Alumni Research Foundation
- Office of the Vice Chancellor for Research and Graduate Education
Through genetic analyses of Hanseniaspora and its close relatives, a new species, Hanseniaspora smithiae sp. nov., was identified with distinct genomic differences from its closest relatives, shedding light on the characteristics of this novel species during diversification and providing insights into the mode of speciation in Hanseniaspora.
During a survey of Nothofagus trees and their parasitic fungi in Andean Patagonia (Argentina), genetically distinct strains of Hanseniaspora were obtained from the sugar-containing stromata of parasitic Cyttaria spp. Phylogenetic analyses based on the single-gene sequences (encoding rRNA and actin) or on conserved, single-copy, orthologous genes from genome sequence assemblies revealed that these strains represent a new species closely related to Hanseniaspora valbyensis. Additionally, delimitation of this novel species was supported by genetic distance calculations using overall genome relatedness indices (OGRI) between the novel taxon and its closest relatives. To better understand the mode of speciation in Hanseniaspora, we examined genes that were retained or lost in the novel species in comparison to its closest relatives. These analyses show that, during diversification, this novel species and its closest relatives, H. valbyensis and Hanseniaspora jakobsenii, lost mitochondrial and other genes involved in the generation of precursor metabolites and energy, which could explain their slower growth and higher ethanol yields under aerobic conditions. Similarly, Hanseniaspora mollemarum lost the ability to sporulate, along with genes that are involved in meiosis and mating. Based on these findings, a formal description of the novel yeast species Hanseniaspora smithiae sp. nov. is proposed, with CRUB 1602(H) as the holotype.
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