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Developmental Analysis of Mimulus Seed Transcriptomes Reveals Functional Gene Expression Clusters and Four Imprinted,

Miguel A Flores-Vergara1, Elen Oneal2, Mario Costa3

  • 1Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC, United States.

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|March 13, 2020
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Summary

This study reveals key genes controlling seed development and maturation in Mimulus. It identifies four paternally imprinted genes crucial for endosperm development, conserved across flowering plants.

Keywords:
K-means clusteringMADS-box genesMimulus guttatusdevelopmental time course analysisendospermgenomic imprintingribonucleic acid sequencingseed development

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Area of Science:

  • Plant Biology
  • Developmental Biology
  • Genetics

Background:

  • Double fertilization triggers seed development, involving embryogenesis and endosperm formation.
  • Imprinted gene expression in the endosperm is vital for balanced parental allele activity and proper seed development.

Purpose of the Study:

  • To analyze gene expression dynamics during seed development in Mimulus.
  • To identify genes linked to critical developmental shifts and morphological changes.
  • To discover and validate imprinted genes in Mimulus endosperm.

Main Methods:

  • Transcriptional time series analysis to track gene expression changes.
  • Correlation of gene expression with morphological seed development.
  • Identification and validation of imprinted endosperm-expressed transcripts.

Main Results:

  • Identified genes associated with secondary cell wall synthesis, cell cycle, chromatin organization, auxin synthesis, fatty acid metabolism, and maturation.
  • Linked gene expression patterns to specific morphological changes in Mimulus seeds.
  • Discovered four endosperm-expressed transcripts with paternal imprinting, conserved in other flowering plants.

Conclusions:

  • Gene regulatory dynamics in ab initio cellular endosperm development were explored in Mimulus.
  • The study validates imprinted endosperm expression in Mimulus guttatus, providing a foundation for future research.
  • Identified conserved imprinted genes suggest functional importance in flowering plant endosperm development.