Genome reorganization and non-linear transposition in maize

摘要: Transposable elements have long been considered as potential agents of large-scale genome reorganization by virtue their ability to induce chromosomal rearrangements such deletions, duplications, inversions, and reciprocal translocations. Previous researchers shown that particular configurations transposon termini can chromosome at high frequencies. Here, we analyzed derived from an unstable allele the maize PI (pericarp color) gene. The progenitor contains both a full-length Ac {Activator) transposable element terminal fragment termed j54c (fractured Ac) inserted in second intron Pl-rr Two rearranged alleles were classical ear twinned sector, found contain large inverted duplication corresponding deficiency. sequences junctions rearrangement breakpoints indicate deletion structures produced single transposition event involving and/Ac located on sister chromatids. Because process describe involves ends different DNA molecules, it is non-linear (NLT). Non-linear rapidly break rejoin chromosomes, thus could played important role generating structural heterogeneity during evolution.