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First published online September 25, 2009
doi: 10.1242/10.1242/dev.036921

Development 136, 3399-3404 (2009)
Published by The Company of Biologists 2009
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Research Report

Polycomb group-dependent imprinting of the actin regulator AtFH5 regulates morphogenesis in Arabidopsis thaliana

Jonathan Nesbit Fitz Gerald1,*, Poh Shi Hui1,2 and Frédéric Berger1,{dagger}

1 Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore 117604.
2 Department of Biological Sciences, National University of Singapore, 14 Science Drive, 4 Singapore 117543.

{dagger} Author for correspondence (fred{at}tll.org.sg)

Accepted 19 August 2009

SUMMARY

During embryogenesis, Polycomb group (PcG) complexes deposit silencing histone modifications and target homeotic genes, which regulate the patterning of other transcription factors. This transcriptional network further maintains cell fate. However, genome-wide identification of histone modifications has suggested that PcG complexes might regulate genes other than those encoding transcription factors. In Arabidopsis, we show that PcG activity directly targets the actin regulator formin ARABIDOPSIS FORMIN HOMOLOGUE 5 (AtFH5). PcG activity silences the paternal allele of AtFH5, restricting its expression to the maternal allele. AtFH5 thus appears to be a new, maternally expressed imprinted gene. We further demonstrate that AtFH5 is responsible for morphological defects caused by the loss of PcG activity in the seed.

Key words: Polycomb, Endosperm, Arabidopsis, Imprinting, ARABIDOPSIS FORMIN HOMOLOGUE 5 (AtFH5)


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© The Company of Biologists Ltd 2009