Epigenetic control of transposon activity and dosage in pollen and hybrid seeds

  • Date: Sep 28, 2022
  • Time: 02:00 PM - 03:30 PM (Local Time Germany)
  • Speaker: Filipe Borges
  • Institut Jean-Pierre Bourgin - INRAE, Versailles, France
  • Location: Central Building
  • Room: Lecture Hall
  • Host: Claudia Köhler

Abstract

The regulation of genome dosage is of fundamental importance in different biological systems, ranging from imprinting to nucleolar dominance and dosage compensation. In plants, the “triploid block” is a classic example of dosage regulation, and our recent results have shown that plants use small RNAs to sense parental genome dosage in hybrid seeds. The paternal epigenome is a key component of this process, as loss of DNA methylation and transposon-derived siRNAs in pollen allows bypassing the triploid block almost completely. In this seminar, I will discuss our current efforts to study the origins, dynamics and function of reproductive small RNAs responsible for hybrid seed collapse, as well as their targets.

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