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- W1915758460 abstract "Abstract For more than a decade, Azotobacter vinelandii has been considered a polyploid bacterium on the basis of physical studies of chromosome size and DNA content per cell. However, as described in the present work, many genetic operations can be performed in A. vinelandii without the constraints expected in a polyploid bacterium: (i) reversion of transposon-induced mutations is usually associated with loss of the transposable element; (ii) revertants retaining the transposon always carry secondary transpositions; (iii) heterozygotic transconjugants and transformants are unstable and segregate homozygotic colonies even in the absence of selection. Physical monitoring of segregation, achieved by colony hybridization, indicates that phenotypic expression of an allele is always correlated with its physical presence, thus ruling out the existence of either threshold dosage requirements or transcriptionally inactive DNA. Chromosomal lac fusions constructed by double crossover with a linearized plasmid show a segregation pattern consistent with the inheritance of one or several chromosomes per daughter cell. Analysis of the delay required for the expression of recessive chromosomal mutations such as rif, nal and str provides further evidence that A. vinelandii is not a polyploid bacterium." @default.
- W1915758460 created "2016-06-24" @default.
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- W1915758460 date "1992-12-01" @default.
- W1915758460 modified "2023-10-01" @default.
- W1915758460 title "Gene dosage analysis in Azotobacter vinelandii." @default.
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- W1915758460 doi "https://doi.org/10.1093/genetics/132.4.869" @default.
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