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Chromosome length polymorphism in Cryptococcus neoformans clinical and environmental isolates.

A protocol for intact DNA preparation from the basidiomycetous yeast Cryptococcus neoformans has been developed and applied to karyotyping C. neoformans isolates displaying different degrees of capsule formation. A total of 46 strains have been analyzed: 23 (50%) isolated from environmental samples (pigeon droppings), all of them belonging to C. neoformans var. neoformans; and 23 (50%) from clinical samples (human and veterinarian) including 10 isolates of C. neoformans var. neoformans and 13 isolates of C. neoformans var. gattii. Our results showed a global genome size ranging from 14.2 to 20.9 Mb for variety neoformans and from 7.9 to 16.8 Mb for variety gattii. The karyotype diversity was very high for variety neoformans (29 different patterns for the 33 analyzed strains) and lower for variety gattii (six different patterns for 13 strains). No grouping among variety neoformans strains from the same origin was found indicating very high genome diversity for this variety, irrespectively of the origin of the strains.