Establishment of Cereal Endosperm Expression Domains: Identification and Properties of a Maize Transfer Cell–Specific Transcription Factor, ZmMRP-1
AUTOR(ES)
Gómez, Elisa
FONTE
American Society of Plant Biologists
RESUMO
In maize, cells at the base of the endosperm are transformed into transfer cells that facilitate nutrient uptake by the developing seed. ZmMRP-1 is the first transfer cell–specific transcriptional activator to be identified. The protein it encodes contains nuclear localization signals and a MYB-related DNA binding domain. A single gene copy is present in maize, mapping to a locus on chromosome 8. ZmMRP-1 is first expressed soon after fertilization, when the endosperm is still a multinuclear coenocyte. The transcript accumulates in the basal nucleocytoplasmic domain that gives rise to transfer cells after cellularization. The transcript can be detected throughout transfer cell development, but it is not found in mature cells. ZmMRP-1 strongly transactivates the promoters of two unrelated transfer cell–specific genes. The properties of ZmMRP-1 are consistent with it being a determinant of transfer cell–specific expression. Possible roles for ZmMRP-1 in the regulation of endosperm and transfer cell differentiation are discussed.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=150582Documentos Relacionados
- maternally expressed gene1 Is a Novel Maize Endosperm Transfer Cell–Specific Gene with a Maternal Parent-of-Origin Pattern of ExpressionW⃞
- Cell-Specific Expression of Mitochondrial Transcripts in Maize Seedlings.
- Prolactin upstream factor I mediates cell-specific transcription.
- Cell-specific action and mutable structure of a transcription factor effector domain.
- A cell-specific factor represses stimulation of transcription in vitro by transcriptional enhancer factor 1.