CHROMOMETHYLTRANSFERASE3/ KRYPTONITE maintain the sulfurea paramutation in Solanum lycopersicum

Cláudia Martinho, Zhengming Wang, Andrea Ghigi, Sarah Buddle, Felix Barbour, Antonia Yarur, Quentin Gouil, Sebastian Müller, Maike Stam, Chang Liu, David C. Baulcombe (Lead / Corresponding author)

Research output: Working paper/PreprintPreprint

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Abstract

Paramutation involves the transfer of a repressive epigenetic mark from a silent allele to an active homologue and, consequently, non-Mendelian inheritance. In tomato the sulfurea (sulf) paramutation is associated with a high level of CHG hypermethylation in a region overlapping the transcription start site of the SlTAB2 gene that affects chlorophyll synthesis. The CCG sub-context hypermethylation is under-represented at this region relative to CTG or CAG implicating the CHROMOMETHYLTRANSFERASE3 (CMT3) in paramutation at this locus. Consistent with this interpretation, loss of CMT3 function leads to loss of the sulf chlorosis, the associated CHG hypermethylation and paramutation. Loss of KRYPTONITE (KYP) histone methyl transferase function has a similar effect linked to reduced H3K9me2 at the promoter region of SlTAB2 and a shift in higher order chromatin structure at this locus. Mutation of the largest subunit of RNA polymerase V (PolV) in contrast does not affect sulf paramutation. These findings indicate the involvement of a CMT3/KYP dependent feedback rather than the PolV-dependent pathway leading to RNA directed DNA methylation (RdDM) in the maintenance of paramutation.
Original languageEnglish
PublisherBioRxiv
Number of pages18
DOIs
Publication statusPublished - 1 Jul 2021

Keywords

  • Heredity
  • paramutation
  • epigenetic memory
  • tomato

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