Microsatellite megatracts in the maize (Zea maysL.) genome

• DOI: 10.1139/g05-061
• Publication Date: 2006-01-06T15:22:20Z
• Authors: E V Ananiev; M A Chamberlin; J Klaiber; S Svitashev
• Keywords: Inbred strain; Repeated sequence

Long tracts (megatracts) of (CAG)n, (TAG)n, and (GAA)n microsatellite sequences capable forming composite DNA segments were found in the maize (Zea mays L.) genome. Some (CAG)n (TAG)n megatracts organized clusters up to 1 Mb on several chromosomes, as detected by fluorescence situ hybridization (FISH), well extended fibers. Extensive polymorphism was among different inbred lines with respect number size megatract A chromosomes. Polymorphism also common B chromosomes nuclei line Zapalote Chico. Different retrotransposable elements often inserted into tracts. Size variation some observed consecutive generations siblings lines, indicating that these loci are highly unstable predisposed dynamic mutations similar those described mammalian systems.