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Recent, extensive, and preferential insertion of members of the miniature inverted-repeat transposable element family Heartbreaker into genic regions of maize

Zhang, Qiang, Arbuckle, John, Wessler, Susan R.·2000·Proceedings of the National Academy of Sciences
DOI 10.1073/pnas.97.3.1160
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Abstract

A 314-bp DNA element called Heartbreaker-hm1 ( Hbr-hm1 ) was previously identified in the 3′ untranslated region of a mutant allele of the maize disease resistance gene HM1 . This element has structural features of miniature inverted-repeat transposable elements (MITEs) and is a member of a large family of approximately 4,000 copies in the maize genome. Unlike previously described MITEs, most members of the Hbr family display over 90% sequence identity. This, coupled with the insertion of an Hbr element into an allele of the HM1 gene, suggested that this family might have spread recently throughout the genome. Consistent with this view is the finding that Hbr insertion sites are remarkably polymorphic. Ten of ten loci containing Hbr elements were found to be polymorphic for the presence or absence of Hbr among a collection of maize inbred lines and teosinte strains. Despite the fact that over 80% of the maize genome contain moderate to highly repetitive DNA, we find that randomly chosen Hbr elements are predominantly in single or low copy regions. Furthermore, when used to query both the public and private databases of plant genes, over 50% of the sequences flanking these Hbr elements resulted in significant “hits.” Taken together, these data indicate that the presence or absence of Hbr elements is a significant contributory factor to the high level of polymorphism associated with maize genic regions.

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Metadata

Authors
Zhang, Q., Arbuckle, J., & Wessler, S. R.
Affiliations
Departments of Botany and Genetics, University of Georgia, Athens, GA 30602; and Pioneer Hi-Bred International, Inc., 7300 N.W. 62nd Avenue, P.O. Box 1004, Johnston, IA 50131-1004
Venue
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences
Published
2000-02
Volume
97
Issue
3
Pages
1160-1165
ISSN
  • 0027-8424
  • 1091-6490
DOI
10.1073/pnas.97.3.1160
Cited by
145
References
0
Language
en

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