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Proc Natl Acad Sci U S A. 2014 Jun 24;111(25):E2616-21. doi: 10.1073/pnas.1402835111. Epub 2014 Jun 9.

Evolutionary developmental transcriptomics reveals a gene network module regulating interspecific diversity in plant leaf shape.

Author information

1
Department of Plant Biology,Center for Sustainable Resource Science, RIKEN, Yokohama, Kanagawa 230-0045, Japan.
2
Department of Plant Biology.
3
School of Veterinary Medicine, and.
4
Department of Statistics, University of California, Davis, CA 95616; and.
5
Department of Plant Biology, nrsinha@ucdavis.edu.

Abstract

Despite a long-standing interest in the genetic basis of morphological diversity, the molecular mechanisms that give rise to developmental variation are incompletely understood. Here, we use comparative transcriptomics coupled with the construction of gene coexpression networks to predict a gene regulatory network (GRN) for leaf development in tomato and two related wild species with strikingly different leaf morphologies. The core network in the leaf developmental GRN contains regulators of leaf morphology that function in global cell proliferation with peripheral gene network modules (GNMs). The BLADE-ON-PETIOLE (BOP) transcription factor in one GNM controls the core network by altering effective concentration of the KNOTTED-like HOMEOBOX gene product. Comparative network analysis and experimental perturbations of BOP levels suggest that variation in BOP expression could explain the diversity in leaf complexity among these species through dynamic rewiring of interactions in the GRN. The peripheral location of the BOP-containing GNM in the leaf developmental GRN and the phenotypic mimics of evolutionary diversity caused by alteration in BOP levels identify a key role for this GNM in canalizing the leaf morphospace by modifying the maturation schedule of leaves to create morphological diversity.

KEYWORDS:

RNA-seq; Solanum species; bioinformatics

PMID:
24927584
PMCID:
PMC4078850
DOI:
10.1073/pnas.1402835111
[Indexed for MEDLINE]
Free PMC Article

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