Patterns of Genomic Variation in the Opportunistic Pathogen Candida glabrata Suggest the Existence of Mating and a Secondary Association with Humans
Carrete, Laia (Centre de Regulació Genòmica)
Ksiezopolska, Ewa (Centre de Regulació Genòmica)
Pegueroles Queralt, Maria Cinta (Centre de Regulació Genòmica)
Gomez-Molero, Emilia (University Medical Center Göttingen)
Saus, Ester (Centre de Regulació Genòmica)
Iraola-Guzmán, Susana (Centre de Regulació Genòmica)
Loska, Damian (Centre de Regulació Genòmica)
Bader, Oliver (University Medical Center Göttingen)
Fairhead, Cecile (Université Paris)
Gabaldón, Toni (Centre de Regulació Genòmica)

Data:	2018
Resum:	Candida glabrata is an opportunistic fungal pathogen that ranks as the second most common cause of systemic candidiasis. Despite its genus name, this yeast is more closely related to the model yeast Saccharomyces cerevisiae than to other Candida pathogens, and hence its ability to infect humans is thought to have emerged independently. Moreover, C. glabrata has all the necessary genes to undergo a sexual cycle but is considered an asexual organism due to the lack of direct evidence of sexual reproduction. To reconstruct the recent evolution of this pathogen and find footprints of sexual reproduction, we assessed genomic and phenotypic variation across 33 globally distributed C. glabrata isolates. We cataloged extensive copy-number variation, which particularly affects genes encoding cell-wall-associated proteins, including adhesins. The observed level of genetic variation in C. glabrata is significantly higher than that found in Candida albicans. This variation is structured into seven deeply divergent clades, which show recent geographical dispersion and large within-clade genomic and phenotypic differences. We show compelling evidence of recent admixture between differentiated lineages and of purifying selection on mating genes, which provides the first evidence for the existence of an active sexual cycle in this yeast. Altogether, our data point to a recent global spread of previously genetically isolated populations and suggest that humans are only a secondary niche for this yeast.
Ajuts:	Ministerio de Economía y Competitividad SEV-2012-0208 Agencia Estatal de Investigación BFU2015-67107 European Commission 310325 Generalitat de Catalunya 2020/SGR-857 European Commission 642095 European Commission 606786
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Candida glabrata ; Mating ; Evolution ; Population genomics ; Human fungal pathogens ; Adhesion
Publicat a:	Current Biology, Vol. 28, Num. 1 (January 2018) , p. 15-27, ISSN 1879-0445

DOI: 10.1016/j.cub.2017.11.027
PMID: 35882189
PMID: 29249661

21 p, 3.4 MB

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