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Clonality, inbreeding, and hybridization in two extremotolerant black yeasts
ID
Gostinčar, Cene
(
Author
),
ID
Sun, Xiaohuan
(
Author
),
ID
Černoša, Anja
(
Author
),
ID
Fang, Chao
(
Author
),
ID
Gunde-Cimerman, Nina
(
Author
),
ID
Song, Zewei
(
Author
)
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https://academic.oup.com/gigascience/article/doi/10.1093/gigascience/giac095/6749380
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Abstract
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.
Language:
English
Keywords:
population genomics
,
halotolerance
,
extremotolerance
,
halophilic fungus
,
Hortaea werneckii
,
Aureobasidium melanogenum
,
hybridization
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
BF - Biotechnical Faculty
Publication status:
Published
Publication version:
Version of Record
Year:
2022
Number of pages:
16 str.
Numbering:
Vol. 11, art. giac095
PID:
20.500.12556/RUL-148528
UDC:
575.111
ISSN on article:
2047-217X
DOI:
10.1093/gigascience/giac095
COBISS.SI-ID:
126622211
Publication date in RUL:
25.08.2023
Views:
438
Downloads:
46
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Record is a part of a journal
Title:
GigaScience
Publisher:
Oxford University Press
ISSN:
2047-217X
COBISS.SI-ID:
3513935
Licences
License:
CC BY 4.0, Creative Commons Attribution 4.0 International
Link:
http://creativecommons.org/licenses/by/4.0/
Description:
This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Secondary language
Language:
Slovenian
Keywords:
populacijska genomika
,
halotoleranca
,
ekstremotoleranca
,
halofilne glive
,
Hortaea werneckii
,
Aureobasidium melanogenum
,
hibridizacija
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
I0-0022
Name:
Mreža raziskovalnih infrastrukturnih centrov Univerze v Ljubljani (MRIC UL)
Funder:
ARRS - Slovenian Research Agency
Project number:
P4-0432
Name:
Morska in mikrobna biotehnologija
Funder:
ARRS - Slovenian Research Agency
Project number:
P1-0198
Name:
Molekularno-biološke raziskave mikroorganizmov
Funder:
ARRS - Slovenian Research Agency
Project number:
J4-2549
Name:
Razgradnja plastike s poliekstremotolerantnimi glivami
Funder:
ARRS - Slovenian Research Agency
Funding programme:
Young researchers
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