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Metabolic potential, ecology and presence of endohyphal bacteria is reflected in genomic diversity of Mucoromycotina

By Anna Muszewska, Alicja Okrasińska, Kamil Steczkiewicz, Olga Drgas, Malgorzata Orłowska, Urszula Perlińska-Lenart, Tamara Aleksandrzak-Piekarczyk, Katarzyna Szatraj, Urszula Zielenkiewicz, Sebastian Piłsyk, Ewa Malc, Piotr A Mieczkowski, Joanna S. Kruszewska, Przemysław Bernat, Julia Pawłowska

Posted 16 Nov 2020
bioRxiv DOI: 10.1101/2020.11.16.384453

We describe the genomes of six Mucoromycotina fungi representing distant saprotrophic lineages within the subphylum (i.e. Umbelopsidales and Mucorales). We selected two Umbelopsis isolates from soil (i.e. U. isabellina, U. vinacea ), two soil-derived Mucor isolates (i.e. M. circinatus, M. plumbeus ), and two Mucorales representatives with extended proteolytic activity (i.e. Thamnidium elegans and Mucor saturninus) . We complement genome analyses with a description of their digestive capabilities, their cell wall carbohydrate composition, and total lipid profiles. Finally, we link the presence of endohyphal bacteria with observed characteristics. One of the genomes, Thamnidium elegans , harbours a complete genome of an associated bacterium classified to Paenibacillus sp. This fungus displays multiple altered traits compared to remaining isolates regardless of their evolutionary distance. T. elegans has expanded carbon assimilation capabilities particularly efficiently degrades carboxylic acids, has a higher diacylglycerol: triacylglycerol ratio and phospholipid composition suggesting a more rigid cellular membrane. Comparison of early-diverging Umbelopsidales with evolutionary younger Mucorales points at several differences particularly in their carbon source preferences and encoded carbohydrate repertoire. All tested Mucoromycotina shares features including the ability to produce 18:3 gamma-linoleic acid and fucose as a cell wall component.

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