| taxonomic comparison of three different groups of aflatoxin producers and a new efficient producer of aflatoxin b1, sterigmatocystin and 3-o-methylsterigmatocystin, aspergillus rambellii sp. nov. | accumulation of the carcinogenic mycotoxin aflatoxin b, has been reported from members of three different groups of aspergilli (4) aspergillus flavus, a. flavus var. parvisclerotigenus, a. parasiticus, a. toxicarius, a. nomius, a. pseudotamarii, a. zhaoqingensis, a. bombycis and from the ascomycete genus petromyces (aspergillus section flavi), (2) emericella astellata and e. venezuelensis from the ascomycete genus emericella (aspergillus section nidulantes) and (3) aspergillus ochraceoroseus fro ... | 2005 | 16094871 |
| characterization of aflatoxin-producing fungi outside of aspergillus section flavi. | most aspergilli that produce aflatoxin are members of aspergillus section flavi, however isolates of several aspergillus species not closely related to section flavi also have been found to produce aflatoxin. two of the species, aspergillus ochraceoroseus and an undescribed aspergillus species srrc 1468, are morphologically similar to members of aspergillus section circumdati. the other species have emericella teleomorphs (em. astellata and an undescribed emericella species srrc 2520) and are mo ... | 2005 | 16396350 |
| aflatoxigenicity in aspergillus: molecular genetics, phylogenetic relationships and evolutionary implications. | aflatoxins (afs) are toxic and carcinogenic secondary metabolites produced by isolates of aspergillus section flavi as well as a number of aspergillus isolates that are classified outside of section flavi. characterization of the af and sterigmatocystin (st) gene clusters and analysis of factors governing regulation of their biosynthesis has resulted in these two mycotoxins being the most extensively studied of fungal secondary metabolites. this wealth of information has allowed the determinatio ... | 2006 | 16944284 |
| characterization of the aspergillus ochraceoroseus aflatoxin/sterigmatocystin biosynthetic gene cluster. | production of carcinogenic aflatoxins has been reported from members of aspergillus section flavi, aspergillus section nidulantes and a newly proposed aspergillus section ochraceorosei that consists of aspergillus ochraceoroseus and a. rambellii. unlike members of section flavi, a. ochraceoroseus and a. rambellii have been shown to accumulate both aflatoxin (af) and the aflatoxin precursor sterigmatocystin (st). alhough morphologically distinct from a. nidulans, molecular characterization of a. ... | 2009 | 19537208 |
| phylogenetic and morphological analysis of aspergillus ochraceoroseus. | aspergillus ochraceoroseus produces the yellow-gold conidia and other characteristics of aspergillus subgenus circumdati section circumdati. however, this species produces aflatoxin, a secondary metabolite characteristic of some members of subgenus circumdati section flavi and sterigmatocystin, a related secondary metabolite usually associated with subgenus nidulantes sections nidulantes and versicolores, as well as members of several other genera. our morphological data support the placement of ... | 2003 | 21149026 |
| functional and phylogenetic analysis of the aspergillus ochraceoroseus aflq (orda) gene ortholog. | within the aspergillus parasiticus and a. flavus aflatoxin (af) biosynthetic gene cluster the aflq (orda) and aflp (omta) genes encode respectively an oxidoreductase and methyltransferase. these genes are required for the final steps in the conversion of sterigmatocystin (st) to aflatoxin b(1) (afb(1)). aspergillus nidulans harbors a gene cluster that produces st, as the aflq and aflp orthologs are either non-functional or absent in the genome. aspergillus ochraceoroseus produces both af and st, ... | 2012 | 22495451 |
| draft genome sequences of two closely related aflatoxigenic aspergillus species obtained from the ivory coast. | aspergillus ochraceoroseus and aspergillus rambellii were isolated from soil detritus in taï national park, ivory coast, africa. the type strain for each species happens to be the only representative ever sampled. both species secrete copious amounts of aflatoxin b1 and sterigmatocystin, because each of their genomes contains clustered genes for biosynthesis of these mycotoxins. we sequenced their genomes using a personal genome machine and found them to be smaller in size (a. ochraceoroseus = 2 ... | 2015 | 26637470 |