Diversity of cultivable fungi associated with Antarctic marine sponges and screening for their antimicrobial, antitumoral and antioxidant potential.

• Published in: World Journal of Microbiology and Biotechnology
• Main Authors: Henríquez, Marlene, Vergara, Karen, Norambuena, Javiera, Beiza, Andrea, Maza, Felipe, Ubilla, Pamela, Araya, Ivanna, Chávez, Renato, San-Martín, Aurelio, Darias, José, Darias, María, Vaca, Inmaculada
• Other Authors: Universidad de Chile = University of Chile Santiago (UCHILE), Universidad de Santiago de Chile Santiago (USACH), Instituto de Productos Naturales y Agrobiologia = Institute of Natural Products and Agrobiology (IPNA), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement IRD : UR226-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2014
• Subjects: MESH: Animals; MESH: Antarctic Regions; MESH: Anti-Bacterial Agents; MESH: Antineoplastic Agents; MESH: Antioxidants; MESH: Ascomycota; MESH: DNA; Ribosomal Spacer; MESH: Porifera; MESH: Sequence Analysis; DNA; [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology; Antarc*; Antarctic; Antarctica; King George Island
• Online Access: https://hal.umontpellier.fr/hal-03019849; https://doi.org/10.1007/s11274-013-1418-x

International audience The diversity of sponge-associated fungi has been poorly investigated in remote geographical areas like Antarctica. In this study, 101 phenotypically different fungal isolates were obtained from 11 sponge samples collected in King George Island, Antarctica. The analysis of ITS sequences revealed that they belong to the phylum Ascomycota. Sixty-five isolates belong to the genera Geomyces, Penicillium, Epicoccum, Pseudeurotium, Thelebolus, Cladosporium, Aspergillus, Aureobasidium, Phoma, and Trichocladium but 36 isolates could not be identified at genus level. In order to estimate the potential of these isolates as producers of interesting bioactivities, antimicrobial, antitumoral and antioxidant activities of fungal culture extracts were assayed. Around 51% of the extracts, mainly from the genus Geomyces and non identified relatives, showed antimicrobial activity against some of the bacteria tested. On the other hand, around 42% of the extracts showed potent antitumoral activity, Geomyces sp. having the best performance. Finally, the potential of the isolated fungi as producers of antioxidant activity seems to be moderate. Our results suggest that fungi associated with Antarctic sponges, particularly Geomyces, would be valuable sources of antimicrobial and antitumoral compounds. To our knowledge, this is the first report describing the biodiversity and the metabolic potential of fungi associated with Antarctic marine sponges.