Περίληψη:
A total of 476 European isolates (310 Cryptococcus neoformans var. grubii, 150 C. neoformans var. neoformans, and 16 C. gattii species complex) from both clinical and environmental sources were analyzed by multi-locus sequence typing. Phylogenetic and population genetic analyses were performed. Sequence analysis identified 74 sequence types among C. neoformans var. neoformans (VNIV), 65 among C. neoformans var. grubii (56 VNI, 8 VNII, 1 VNB), and 5 among the C. gattii species complex (4 VGI and 1 VGIV) isolates. ST23 was the most frequent genotype (22%) among VNI isolates which were mostly grouped in a large clonal cluster including 50% of isolates. Among VNIV isolates, a predominant genotype was not identified. A high percentage of autochthonous STs were identified in both VNI (71%) and VNIV (96%) group of isolates. The 16 European C. gattii species complex isolates analyzed in the present study originated all from the environment and all belonged to a large cluster endemic in the Mediterranean area. Population genetic analysis confirmed that VNI group of isolates were characterized by low variability and clonal expansion while VNIV by a higher variability and a number of recombination events. However, when VNI and VNIV environmental isolates were compared, they showed a similar population structure with a high percentage of shared mutations and the absence of fixed mutations. Also linkage disequilibrium analysis reveals differences between clinical and environmental isolates showing a key role of PLB1 allele combinations in host infection as well as the key role of LAC1 allele combinations for survival of the fungus in the environment. The present study shows that genetic comparison of clinical and environmental isolates represents a first step to understand the genetic characteristics that cause the shift of some genotypes from a saprophytic to a parasitic life style. © 2019 Elsevier Inc.
Συγγραφείς:
Cogliati, M.
Desnos-Ollivier, M.
McCormick-Smith, I.
Rickerts, V.
Ferreira-Paim, K.
Meyer, W.
Boekhout, T.
Hagen, F.
Theelen, B.
Inácio, J.
Alonso, B.
Colom, M.F.
Trilles, L.
Montagna, M.T.
De Donno, A.
Susever, S.
Ergin, C.
Velegraki, A.
Ellabib, M.S.
Nardoni, S.
Macci, C.
Trovato, L.
Dipineto, L.
Akcaglar, S.
Mlinaric-Missoni, E.
Bertout, S.
Vencá, A.C.F.
Sampaio, A.C.
Criseo, G.
Ranque, S.
Çerikçioğlu, N.
Marchese, A.
Vezzulli, L.
Ilkit, M.
Pasquale, V.
Polacheck, I.
Lockhart, S.R.
Λέξεις-κλειδιά:
allele; Article; clonal variation; Cryptococcus gattii; Cryptococcus neoformans; Cryptococcus neoformans var. grubii; Cryptococcus neoformans var. neoformans; fungal gene; fungus mutation; gene linkage disequilibrium; genetic analysis; genetic recombination; genetic variability; genotype; LAC1 gene; multilocus sequence typing; nonhuman; PLB1 gene; population genetics; population structure; priority journal; Southern Europe; animal; Cryptococcus gattii; Cryptococcus neoformans; environmental microbiology; Europe; genetics; human; microbiological examination; phylogeny; population genetics, Animals; Cryptococcus gattii; Cryptococcus neoformans; Environmental Microbiology; Europe; Genetics, Population; Genotype; Humans; Mediterranean Region; Multilocus Sequence Typing; Mycological Typing Techniques; Phylogeny
