Clonality, inbreeding, and hybridization in two extremotolerant black yeasts

Gostinčar, Cene (avtor), Sun, Xiaohuan (avtor), Černoša, Anja (avtor), Fang, Chao (avtor), Gunde-Cimerman, Nina (avtor), Song, Zewei (avtor)

Background: The great diversity of lifestyles and survival strategies observed in fungi is reflected in the many ways in which they reproduce and recombine. Although a complete absence of recombination is rare, it has been reported for some species, among them 2 extremotolerant black yeasts from Dothideomycetes: Hortaea werneckii and Aureobasidium melanogenum. Therefore, the presence of diploid strains in these species cannot be explained as the product of conventional sexual reproduction. Results: Genome sequencing revealed that the ratio of diploid to haploid strains in both H. werneckii and A. melanogenum is about 2:1. Linkage disequilibrium between pairs of polymorphic loci and a high degree of concordance between the phylogenies of different genomic regions confirmed that both species are clonal. Heterozygosity of diploid strains is high, with several hybridizing genome pairs reaching the intergenomic distances typically seen between different fungal species. The origin of diploid strains collected worldwide can be traced to a handful of hybridization events that produced diploids, which were stable over long periods of time and distributed over large geographic areas. Conclusions: Our results, based on the genomes of over 100 strains of 2 black yeasts, show that although they are clonal, they occasionally form stable and highly heterozygous diploid intraspecific hybrids. The mechanism of these apparently rare hybridization events, which are not followed by meiosis or haploidization, remains unknown. Both extremotolerant yeasts, H. werneckii and even more so A. melanogenum, a close relative of the intensely recombining and biotechnologically relevant Aureobasidium pullulans, provide an attractive model for studying the role of clonality and ploidy in extremotolerant fungi.

• Jezik: Angleški jezik
• Ključne besede: population genomics, halotolerance, extremotolerance, halophilic fungus, Hortaea werneckii, Aureobasidium melanogenum, hybridization
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: BF - Biotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: 16 str.
• Številčenje: Vol. 11, art. giac095
• PID: 20.500.12556/RUL-148528
• UDK: 575.111
• ISSN pri članku: 2047-217X
• DOI: 10.1093/gigascience/giac095
• COBISS.SI-ID: 126622211
• Datum objave v RUL: 25.08.2023

Gradivo je del revije

• Naslov: GigaScience
• Založnik: Oxford University Press
• ISSN: 2047-217X
• COBISS.SI-ID: 3513935

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: populacijska genomika, halotoleranca, ekstremotoleranca, halofilne glive, Hortaea werneckii, Aureobasidium melanogenum, hibridizacija