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• W3043717812 startingPage "18091" @default.
• W3043717812 abstract "The frequent mutations recovered recently from the pollen of select maize lines resulted from the meiotic mobilization of specific low-copy number long-terminal repeat (LTR) retrotransposons, which differ among lines. Mutations that arise at male meiosis produce kernels with concordant mutant phenotypes in both endosperm and embryo because the two sperms that participate in double fertilization are genetically identical. Those are in a majority. However, a small minority of kernels with a mutant endosperm carry a nonconcordant normal embryo, pointing to a postmeiotic or microgametophytic origin. In this study, we have identified the basis for those nonconcordant mutations. We find that all are produced by transposition of a defective LTR retrotransposon that we have termed dRemp (defective retroelement mobile in pollen). This element has several unique properties. Unlike the mutagenic LTR retrotransposons identified previously, dRemp is present in hundreds of copies in all sequenced lines. It seems to transpose only at the second pollen mitosis because all dRemp insertion mutants are nonconcordant yet recoverable in either the endosperm or the embryo. Although it does not move in most lines, dRemp is highly mobile in the Corn Belt inbred M14, identified earlier by breeders as being highly unstable. Lastly, it can be recovered in an array of structures, ranging from solo LTRs to tandem dRemp repeats containing several internal LTRs, suggestive of extensive recombination during retrotransposition. These results shed further light on the spontaneous mutation process and on the possible basis for inbred instability in maize." @default.
• W3043717812 created "2020-07-23" @default.
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• W3043717812 date "2020-07-13" @default.
• W3043717812 modified "2023-10-15" @default.
• W3043717812 title "The unusualdRempretrotransposon is abundant, highly mutagenic, and mobilized only in the second pollen mitosis of some maize lines" @default.
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• W3043717812 doi "https://doi.org/10.1073/pnas.2010234117" @default.
• W3043717812 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7395433" @default.
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• W3043717812 hasPublicationYear "2020" @default.
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