Changes in state of the Wx-m5 allele of maize are due to intragenic transposition of Ds

Article Abstract:

The maize waxy (Wx)-m5 allele was isolated and characterized. In the absence of an Ac insertion, the Wx-m5 allele is phenotypically wild-type, although the level of enzyme activity is reduced relative to the wild-type. Sequence analysis showed that Wx-m5 contains either one or two Ds inserts, with the insertion at -470 relative to the transcriptional start site constituting a part of the Wx gene. In the presence of Ac, Wx-m5 exhibits mutant wx sectors and gives rise to wx-m and wx derivatives. The clonal sectors of Wx-m5 represents transposon insertion with the concommitant loss of gene expression.

Insertion elements, DNA, DNA insertion elements

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Genetic study of the loss and restoration of mutator transposon activity in maize: evidence against dominant-negative regulator associated with loss of activity

Article Abstract:

The heritability of Mu transposon activity was studied in a maize line exhibiting non-Mendelian transmission of this trait. Transmission rates of Mu activity were high in both sexes, but this rate was higher and less variable for the female. Backcrossing with active Mu plants restored Mu activity lost by outcrossing or selfing. Mu1 elements were hypermethylated in Mu-inactive plants, regardless of lineage. These results ran counter to predictions based on previously published data.

Plant genetics, Genetic regulation

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Adjacent sequences influence DNA repair accompanying transposon excision in maize

Article Abstract:

Transposon footprints are rearrangements of DNA sequences caused by the flanking of mobile elements. An analysis of a corn gene responsible for expressing waxiness revealed that the development of transposon footprints followed a definite arrangement within the sites where they excise. It is suggested that the definitive arrangement of transposon footprints result from the flanking sequences of transposons during DNA repair processes.

DNA repair

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