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Paramutation at the maize pl1 locus is associated with RdDM activity at distal tandem repeats.

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Summary

Maize paramutation, an exception to Mendelian inheritance, is linked to small RNA production and DNA methylation. This epigenetic mechanism involves specific repeat regions on chromosomes, regulating gene transcription.

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Area of Science:

  • Genetics
  • Epigenetics
  • Plant Biology

Background:

  • Mendelian inheritance exceptions, like paramutation in maize, indicate novel chromosomal behaviors.
  • The specific chromosomal features underlying paramutation in maize remain largely unknown.
  • The Pl1-Rhoades allele in maize exhibits paramutation, affecting plant pigmentation.

Purpose of the Study:

  • To investigate the chromosomal features and molecular mechanisms responsible for paramutation in maize.
  • To identify the role of small RNA production and DNA methylation in the heritable repression of the Pl1-Rhoades gene.

Main Methods:

  • Analysis of small RNA production linked to RNA polymerase IV function.
  • Investigating tandem repeat copy number variations in different pl1 haplotypes.
  • Utilizing 4C interactions, CHD3a-dependent small RNA profiling, nuclease sensitivity, and polyadenylated RNA analysis.
  • Comparative and mutant analyses to correlate transcriptional repression with molecular markers.

Main Results:

  • Small RNA production, reflecting RNA polymerase IV activity in tandem repeats, coincides with meiotically-heritable repression of Pl1-Rhoades.
  • Paramutation, characterized by trans-homolog silencing, is observed in pl1 haplotypes with three repeat units but not two.
  • A specific repeat subregion shows regulatory potential, indicated by 4C interactions, small RNA profiles, and nuclease sensitivity.
  • Transcriptional repression of Pl1-Rhoades correlates with 24-nucleotide RNA production and cytosine methylation at this subregion.

Conclusions:

  • Paramutation in maize involves RNA-directed DNA methylation operating on a cis-linked, copy-number-dependent transcriptional regulatory element.
  • The findings support a model where epigenetic regulation via small RNAs and DNA methylation underlies paramutation.
  • Specific repeat structures and their associated epigenetic modifications are crucial for regulating gene expression in a heritable manner.