Parasexual cycle

AccessScience ◽  
2015 ◽  
Keyword(s):  
Parasexual Cycle

scholarly journals Parasexuality and Ploidy Change in Candida tropicalis

2013 ◽  
Vol 12 (12) ◽  
pp. 1629-1640 ◽  
Author(s):  
Riyad N. H. Seervai ◽  
Stephen K. Jones ◽  
Matthew P. Hirakawa ◽  
Allison M. Porman ◽  
Richard J. Bennett
Keyword(s):  
Sexual Reproduction ◽  
Candida Tropicalis ◽  
Culture Conditions ◽  
Sexual Cycle ◽  
Chromosome Loss ◽  
Parasexual Cycle ◽  
Content Type ◽  
Ploidy Changes ◽  
Diploid Cells

ABSTRACTCandidaspecies exhibit a variety of ploidy states and modes of sexual reproduction. Most species possess the requisite genes for sexual reproduction, recombination, and meiosis, yet only a few have been reported to undergo a complete sexual cycle including mating and sporulation.Candida albicans, the most studiedCandidaspecies and a prevalent human fungal pathogen, completes its sexual cycle via a parasexual process of concerted chromosome loss rather than a conventional meiosis. In this study, we examine ploidy changes inCandida tropicalis, a closely related species toC. albicansthat was recently revealed to undergo sexual mating.C. tropicalisdiploid cells mate to form tetraploid cells, and we show that these can be induced to undergo chromosome loss to regenerate diploid forms by growth on sorbose medium. The diploid products are themselves mating competent, thereby establishing a parasexual cycle in this species for the first time. Extended incubation (>120 generations) ofC. tropicalistetraploid cells under rich culture conditions also resulted in instability of the tetraploid form and a gradual reduction in ploidy back to the diploid state. The fitness levels ofC. tropicalisdiploid and tetraploid cells were compared, and diploid cells exhibited increased fitness relative to tetraploid cellsin vitro, despite diploid and tetraploid cells having similar doubling times. Collectively, these experiments demonstrate distinct pathways by which a parasexual cycle can occur inC. tropicalisand indicate that nonmeiotic mechanisms drive ploidy changes in this prevalent human pathogen.

DEMONSTRATION OF A PARASEXUAL CYCLE IN THE ENTOMOPATHOGENIC FUNGUS METARHIZIUM ANISOPLIAE

1980 ◽  
Vol 22 (2) ◽  
pp. 309-314 ◽  
Author(s):  
K. Al-Aidroos
Keyword(s):  
Metarhizium Anisopliae ◽  
Entomopathogenic Fungus ◽  
Parasexual Cycle

In an attempt to demonstrate the existence of a parasexual cycle in the imperfect entomopathogenic fungus, Metarhizium anisopliae (Metschnikoff) Sorokin, doubly- and triply-marked strains were forced to form heterokaryons. All heterokaryons produced diploid spores, two of which yielded putative recombinants.

scholarly journals The Parasexual Cycle in Candida albicans Provides an Alternative Pathway to Meiosis for the Formation of Recombinant Strains

PLoS Biology ◽  
2008 ◽  
Vol 6 (5) ◽  
pp. e110 ◽  
Author(s):  
Anja Forche ◽  
Kevin Alby ◽  
Dana Schaefer ◽  
Alexander D Johnson ◽  
Judith Berman ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Alternative Pathway ◽  
Parasexual Cycle ◽  
Recombinant Strains

Transmission and modification of transformation markers during an induced parasexual cycle in Penicillium roqueforti

1992 ◽  
Vol 21 (4-5) ◽  
pp. 377-383 ◽  
Author(s):  
Nathalie Durand ◽  
Pascale Reymond ◽  
Michel F�vre
Keyword(s):  
Penicillium Roqueforti ◽  
Parasexual Cycle

scholarly journals Guido Pontecorvo. 29 November 1907 – 25 September 1999

2002 ◽  
Vol 48 ◽  
pp. 375-390 ◽  
Author(s):  
O. Siddiqi
Keyword(s):  
Somatic Cell ◽  
Aspergillus Nidulans ◽  
Royal Society ◽  
Large Body ◽  
Somatic Cell Genetics ◽  
Parasexual Cycle ◽  
Sense Of Humor ◽  
Human Somatic Cell

Guido Pontecorvo was elected a Fellow of The Royal Society in 1955 for his contributions to the genetics of Drosophila and the fungus Aspergillus nidulans . Pontecorvo was a leading British geneticist, prominent in the decade preceding the discovery of DNA, who enriched our understanding of genes and whose pioneering work on the parasexual cycle in fungi found application in human somatic cell genetics. Known to friends as Ponte, he had a strong personality. Somewhat irascible but warm, with a wry sense of humor, he made many lifelong friends and acquired a large body of admirers.

The Parasexual Cycle in Yeasts of the Genus Metschnikowia

Mycologia ◽  
1970 ◽  
Vol 62 (3) ◽  
pp. 462 ◽  
Author(s):  
J. I. Pitt ◽  
M. W. Miller
Keyword(s):  
Parasexual Cycle

Cytological investigations of the parasexual cycle in fungi I. Nuclear fusion

1965 ◽  
Vol 26 (2-3) ◽  
pp. 233-240 ◽  
Author(s):  
Alexander Bakerspigel
Keyword(s):  
Nuclear Fusion ◽  
Parasexual Cycle
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