Genetic positioning of centromeres using half-tetrad analysis in a 4x-2x cross population of potato.

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  • Additional Information
    • Source:
      Publisher: Oxford University Press Country of Publication: United States NLM ID: 0374636 Publication Model: Print-Electronic Cited Medium: Print ISSN: 0016-6731 (Print) Linking ISSN: 00166731 NLM ISO Abbreviation: Genetics Subsets: MEDLINE
    • Publication Information:
      Publication: 2021- : [Oxford] : Oxford University Press
      Original Publication: Austin, Tex. [etc.]
    • Subject Terms:
      Crosses, Genetic* ; Genetic Techniques*; Centromere/*genetics ; Chromosome Positioning/*genetics ; Solanum tuberosum/*genetics; Chromosome Mapping ; Chromosome Segregation/genetics ; Chromosomes, Plant/genetics ; Genetic Markers ; Heterozygote ; Polymorphism, Genetic
    • Abstract:
      From biological and genetic standpoints, centromeres play an important role in the delivery of the chromosome complement to the daughter cells at cell division. The positions of the centromeres of potato were determined by half-tetrad analysis in a 4x-2x population where the male parent produced 2n pollen by first-division restitution (FDR). The genetic linkage groups and locations of 95 male parent-derived amplified fragment length polymorphism markers could be determined by comparing their position on a 2x-2x highly saturated linkage map of potato. Ten centromere positions were identified by 100% heterozygosity transmitted from the 2n heterozygous gametes of the paternal parent into the tetraploid offspring. The position of these centromeric marker loci was in accordance with those predicted by the saturated 2x-2x map using the level of marker clustering as a criterion. Two remaining centromere positions could be determined by extrapolation. The frequent observation of transmission of 100% heterozygosity proves that the meiotic restitution mechanism is exclusively based on FDR. Additional investigations on the position of recombination events of three chromosomes with sufficient numbers of markers showed that only one crossover occurred per chromosome arm, proving strong interference of recombination between centromere and telomere.
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    • Accession Number:
      0 (Genetic Markers)
    • Publication Date:
      Date Created: 20070307 Date Completed: 20070913 Latest Revision: 20240414
    • Publication Date:
      20240414
    • Accession Number:
      PMC1893073
    • Accession Number:
      10.1534/genetics.107.070870
    • Accession Number:
      17339217