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Journal Article
Review
Genes and functions controlled by floral organ identity genes.
Seminars in Cell & Developmental Biology 2010 Februrary
Floral organ identity genes specify the identity of floral organs in a manner analogous to the specification of body segments by Hox genes in animals. Different combinations of organ identity genes co-ordinate the expression of genes required for the development of each type of floral organ, from organ initiation until final differentiation. Here, I review what is known about the genes and functions subordinate to the organ identity genes. The sets of target genes change as organ development progresses and ultimately organ identity genes modify the expression of thousands of genes with a multitude of predicted functions, particularly in reproductive organs. However, genes involved in transcriptional control and hormone functions feature prominently among the early and direct targets. Functional analysis showed that control of organ-specific tissues and structures can be delegated to specialised intermediate regulators, but organ identity genes also fine-tune genes with general roles in shoot organ development, consistent with the notion that organ identity genes modify a core leaf-like developmental program. Future challenges include obtaining data with cellular resolution, predictive modelling of the regulatory network, and quantitative analysis of how organ identity genes and their targets control cell behaviour and ultimately organ shape.
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