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Related Experiment Videos

Alternative splicing of cyclin transcripts in maize endosperm

Y Sun1, B A Flannigan, J T Madison

  • 1Department of Soil, Crop and Atmospheric Sciences, Cornell University, Ithaca, NY 14853, USA.

Gene
|August 22, 1997
PubMed
Summary

A maize cyclin gene produces two RNA versions through alternative splicing. One version is functional in cell division, while the other, found in various plant tissues, is not.

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Area of Science:

  • Plant Molecular Biology
  • Cell Cycle Regulation
  • Gene Expression

Background:

  • Cyclins are key regulatory proteins controlling cell cycle progression by activating cyclin-dependent protein kinases (CDKs).
  • Understanding cyclin gene expression is crucial for deciphering plant development, particularly in endosperm formation.

Purpose of the Study:

  • To investigate the expression and function of a specific cyclin gene during maize endosperm development.
  • To characterize an alternatively spliced cyclin transcript identified in maize.

Main Methods:

  • Analysis of cDNA and genomic sequences to identify gene structure and splicing patterns.
  • Detection of alternatively spliced transcripts in various maize tissues.
  • Functional assays using Xenopus oocyte maturation to assess RNA activity.

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Main Results:

  • A cyclin transcript with a 63-bp deletion in the cyclin box, crucial for CDK interaction, was identified.
  • This deletion results from alternative splicing of a retained intron in the normal transcript.
  • The alternatively spliced cyclin RNA was mitotically non-functional, failing to induce Xenopus oocyte maturation.
  • The alternatively spliced cyclin transcript was detected in multiple maize tissues, including endosperm, apical meristem, leaf, and root.

Conclusions:

  • Alternative splicing generates a non-functional cyclin variant in maize.
  • This non-functional cyclin transcript is widely distributed across various plant tissues.
  • The study highlights the complexity of post-transcriptional regulation in plant cell cycle control.