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Maize Spm transposable element has an enhancer-insensitive promoter

R Raina1, D Cook, N Fedoroff

  • 1Department of Embryology, Carnegie Institution of Washington, Baltimore, MD 21210.

Proceedings of the National Academy of Sciences of the United States of America
|July 1, 1993
PubMed
Summary

Researchers investigated the maize Suppressor-mutator (Spm) transposable element promoter. Its unique structure ensures low, insertion-site independent transposition frequency, crucial for genetic stability.

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Area of Science:

  • Plant molecular biology
  • Genetics
  • Molecular mechanisms of transposition

Background:

  • The maize Suppressor-mutator (Spm) transposable element is a key player in plant genome dynamics.
  • Understanding Spm promoter function is crucial for controlling its transposition and impact on host genomes.

Purpose of the Study:

  • To delineate the functional promoter region of the maize Spm transposable element.
  • To characterize the regulatory elements governing Spm promoter activity and its interaction with other promoters.

Main Methods:

  • Transient assay system to analyze promoter activity.
  • Deletion analysis to identify essential promoter sequences.
  • Comparative analysis with cauliflower mosaic virus (CaMV) 35S promoter.

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Main Results:

  • The constitutive promoter activity of Spm is confined to a 0.2-kb upstream region.
  • The Spm promoter is weak, lacks a TATA box, and relies on repetitive sequence elements.
  • The Spm promoter exhibits distinct regulatory properties, including insensitivity to CaMV 35S enhancer and inhibitory effects on the 35S core promoter.

Conclusions:

  • The Spm promoter's unique characteristics contribute to its low and insertion-site independent transposition frequency.
  • These intrinsic promoter properties are integral to the genetic control of Spm transposition.
  • The Spm promoter's regulatory features provide a buffer against mutational and position-dependent activity changes, ensuring genetic stability.