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The inveterate wanderer: study of Enhancer wandering on chromosome 3 in maize

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Abstract

The transposition of the maize transposable element Enhancer (En) had been focused on one chromosome 3 for several generations. From the a1-m(Au) allele with an autonomous En, a new En reporter allele a1-m(r)3927-1, was isolated that undergoes very infrequent and late excision events, producing one or two small spots in the aleurone. This allele is seriously impaired in its capacity to excise. Coincident with the origin of this allele, an En was located at a site close to the a1 locus. From this initial insertion site, the movement of this En was followed for three to four generations in 974 families with a higher transposition rate of this En (50% of the testcross progeny) than that found in a previous study of En transposition. This is the first case reported where a particular En was followed for more than three generations. The higher rate of wanderings of this En along the same chromosome led to the term ‘vagabond’ En (En vag). Genetic evidence that En may transpose from a replicated donor site to an unreplicated site is provided. Speculative mechanisms on the origin of a1-m(r)3927-1 and En vag are discussed.

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Authors and Affiliations

  1. Agronomy Department, Iowa State University, 50011, IA, USA

    B. -S. Seo & P. A. Peterson

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  1. B. -S. Seo
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  2. P. A. Peterson
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Communicated by F. Salamini

Journal Paper No. J-15864 of Iowa Agricultural and Iowa Economical Experiment Station Project #3176

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Seo, B.S., Peterson, P.A. The inveterate wanderer: study of Enhancer wandering on chromosome 3 in maize. Theoret. Appl. Genetics 93, 151–163 (1996). https://doi.org/10.1007/BF00225740

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  • DOI: https://doi.org/10.1007/BF00225740

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