DewarBousquetDufourEtAl1997

Reference

Dewar, K., Bousquet, J., Dufour, J., Bernier, L. (1997) A meiotically reproducible chromosome length polymorphism in the ascomycete fungus Ophiostoma ulmi (sensu lato). Molecular and General Genetics, 255(1):38-44.

Abstract

We have followed the transmission of Ophiostoma ulmi s.l. chromosome length polymorphisms (CLPs) into the F-2 generation to determine the reproducibility of a genome rearrangement culminating in the conversion of a 1.0 Mb chromosome into a 800 kb chromosome. The 1.0 Mb chromosome in strain CESS16K is thus far unique among O. ulmi s.l. wild-type strains, as no other wild-type strains have been observed with chromosomes smaller than 2.3 Mb. It has been previously shown that the 1.0 Mb chromosome is mitotically stable, carries at least one normally expressed gene, and is transmitted through meiosis. In this study, a series of crosses were performed to further elucidate the pattern of inheritance of the 1.0 Mb chromosome and the process of conversion of the 1.0 Mb species to 800 kb. In crosses where the 1.0 Mb chromosome was allowed to pair with itself or with the 800 kb chromosome, all progeny inherited a copy of the 1.0 Mb or 800 kb form, further demonstrating the A-type nature of these small chromosomes. When a cross was repeated between the strains CESS16K (1.0 Mb chromosome) and FG245B(r)-O (no 1.0 Mb or 800 kb chromosome)? the occurrence of a 800 kb chromosome was observed in 9% of the progeny. A reciprocal cross between an 800 kb strain and a strain with no 800 kb or 1.0 Mb chromosome was conducted, and a progeny strain containing a 1.0 Mb chromosome was recovered. The reproducibility and reciprocality of the 1.0 Mb to 800 kb chromosome conversion demonstrates that meiotic processes are responsible for this CLP, and that O. ulmi s.l. strains with various divergent genome architectures can remain sexually compatible.

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@ARTICLE { DewarBousquetDufourEtAl1997,
    AUTHOR = { Dewar, K. and Bousquet, J. and Dufour, J. and Bernier, L. },
    TITLE = { A meiotically reproducible chromosome length polymorphism in the ascomycete fungus Ophiostoma ulmi (sensu lato) },
    JOURNAL = { Molecular and General Genetics },
    YEAR = { 1997 },
    VOLUME = { 255 },
    PAGES = { 38-44 },
    NUMBER = { 1 },
    NOTE = { Xj461 Times Cited:2 Cited References Count:33 },
    ABSTRACT = { We have followed the transmission of Ophiostoma ulmi s.l. chromosome length polymorphisms (CLPs) into the F-2 generation to determine the reproducibility of a genome rearrangement culminating in the conversion of a 1.0 Mb chromosome into a 800 kb chromosome. The 1.0 Mb chromosome in strain CESS16K is thus far unique among O. ulmi s.l. wild-type strains, as no other wild-type strains have been observed with chromosomes smaller than 2.3 Mb. It has been previously shown that the 1.0 Mb chromosome is mitotically stable, carries at least one normally expressed gene, and is transmitted through meiosis. In this study, a series of crosses were performed to further elucidate the pattern of inheritance of the 1.0 Mb chromosome and the process of conversion of the 1.0 Mb species to 800 kb. In crosses where the 1.0 Mb chromosome was allowed to pair with itself or with the 800 kb chromosome, all progeny inherited a copy of the 1.0 Mb or 800 kb form, further demonstrating the A-type nature of these small chromosomes. When a cross was repeated between the strains CESS16K (1.0 Mb chromosome) and FG245B(r)-O (no 1.0 Mb or 800 kb chromosome)? the occurrence of a 800 kb chromosome was observed in 9% of the progeny. A reciprocal cross between an 800 kb strain and a strain with no 800 kb or 1.0 Mb chromosome was conducted, and a progeny strain containing a 1.0 Mb chromosome was recovered. The reproducibility and reciprocality of the 1.0 Mb to 800 kb chromosome conversion demonstrates that meiotic processes are responsible for this CLP, and that O. ulmi s.l. strains with various divergent genome architectures can remain sexually compatible. },
    KEYWORDS = { electrophoretic karyotypes chromosome length polymorphisms genome rearrangements ophiostoma ulmi (sensu lato) dutch elm disease rice blast fungus electrophoretic karyotypes saccharomyces-cerevisiae magnaporthe-grisea coprinus-cinereus candida-albicans ustilago-hordei sp-nov pathogen },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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