Patterns of Gene Duplication and Functional Evolution During the Diversification of the<i>AGAMOUS</i>Subfamily of MADS Box Genes in Angiosperms

Kramer, Elena M.; Jaramillo, M. Alejandra; Stilio, Verónica S. Di

doi:10.1534/genetics.166.2.1011

Cited by 386 publications

(494 citation statements)

References 105 publications

Supporting

Mentioning

460

Contrasting

Unclassified

Order By: Relevance

“…This set of relationships has been used to formalize a classification system for angiosperms (APG II 2003) and to guide investigation of various aspects of early angiosperm evolution (e.g., Endress and Igersheim 2000;Friis et al 2000;Thien et al 2000;Williams and Friedman 2002;Ronse De Craene et al 2003;Feild et al 2004;Kramer et al 2004). Work is still needed to establish firmly that the current consensus rests on a solid phylogenetic foundation and, more importantly, to resolve the polytomy among Ceratophyllum, Chloranthaceae, monocots, magnoliids, and eudicots.…”

Section: Discussionmentioning

confidence: 99%

“…Convergence at the morphological level may be a factor. Future investigations of the development of morphological characters using molecular genetic approaches (e.g., Buzgo et al 2004;Kramer et al 2004) and other nonmolecular characters may sort out homoplasy and identify proper synapomorphies for the several clades identified here.…”

Section: Monophyly Of and Relationships Within The Magnoliidsmentioning

confidence: 98%

See 1 more Smart Citation

Phylogenetic Analyses of Basal Angiosperms Based on Nine Plastid, Mitochondrial, and Nuclear Genes

Qiu¹,

Dombrovska²,

Lee³

et al. 2005

International Journal of Plant Sciences

162

128

View full text Add to dashboard Cite

DNA sequences of nine genes (plastid: atpB, matK, and rbcL; mitochondrial: atp1, matR, mtSSU, and mtLSU; nuclear: 18S and 26S rDNAs) from 100 species of basal angiosperms and gymnosperms were analyzed using parsimony, Bayesian, and maximum likelihood methods. All of these analyses support the following consensus of relationships among basal angiosperms. First, Amborella, Nymphaeaceae, and Austrobaileyales are strongly supported as a basal grade in the angiosperm phylogeny, with either Amborella or Amborella and Nymphaeales as sister to all other angiosperms. An examination of nucleotide substitution patterns of all nine genes ruled out any possibility of analytical artifacts because of RNA editing and GC-content bias in placing these taxa at the base of the angiosperm phylogeny. Second, Magnoliales are sister to Laurales and Piperales are sister to Canellales. These four orders together constitute the magnoliid clade. Finally, the relationships among Ceratophyllum, Chloranthaceae, monocots, magnoliids, and eudicots are resolved in different ways in various analyses, mostly with low support. Our study indicates caution in total evidence approaches in that some of the genes employed (e.g., mtSSU, mtLSU, and nuclear 26S rDNA) added signal that conflicted with the other genes in resolving certain parts of the phylogenetic tree.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Monophyly Of and Relationships Within The Magnoliidsmentioning

confidence: 98%

Phylogenetic Analyses of Basal Angiosperms Based on Nine Plastid, Mitochondrial, and Nuclear Genes

Qiu¹,

Dombrovska²,

Lee³

et al. 2005

International Journal of Plant Sciences

162

128

View full text Add to dashboard Cite

show abstract

“…Aquilegia, the columbine, belongs in a sister clade to Thalictrum, with over 90% sequence similarity in the coding region of floral MADs box genes (Kramer et al, 2003(Kramer et al, , 2004. After performing a diagnostic phylogenetic analysis of aligned MIXTA-like (ML) proteins from several taxa, one of the Aquilegia ESTs, TC15922 (here referred to as AqMYBML), appeared to encode a protein most closely related to MIXTAlike proteins AmMYBML2 from snapdragon and PhMYB1 from petunia.…”

Section: Cloning Of a Mixta-like Ortholog From Thalictrummentioning

confidence: 99%

An ortholog of MIXTA‐like2 controls epidermal cell shape in flowers of Thalictrum

et al. 2009

Self Cite

View full text Add to dashboard Cite

Summary• Here, we investigated the genetic underpinnings of pollination-related floral phenotypes in Thalictrum, a ranunculid with apetalous flowers. The variable presence of petaloid features in other floral organs correlates with distinct adaptations to insect vs. wind pollination. Conical cells are present in sepals or stamens of insectpollinated species, and in stigmas. We characterized a Thalictrum ortholog of the Antirrhinum majus transcription factor MIXTA-like2, responsible for conical cells, from three species with distinct floral morphologies, representing two pollination syndromes.• Genes were cloned by PCR and analysed phylogenetically. Expression analyses were conducted by quantitative PCR and in situ hybridization, followed by functional studies in transgenic tobacco.• The cloned genes encode R2R3 MYB proteins closely related to Antirrhinum AmMYBML2 and Petunia hybrida PhMYB1. Spatial expression by in situ hybridization overlaps areas of conical cells. Overexpression in tobacco induces cell outgrowths in carpel epidermis and significantly increases the height of petal conical cells.• We have described the first orthologs of AmMIXTA-like2 outside the core eudicots, likely ancestral to the MIXTA/MIXTA-like1 duplication. The conserved role in epidermal cell elongation results in conical cells, micromorphological markers for petaloidy. This adaptation to attract insect pollinators was apparently lost after the evolution of wind pollination in Thalictrum.

show abstract

“…This gene has experienced a duplication in the lineage leading to the eudicotyledons, creating two duplicate gene lineages. 48,51 In Antirrhinum, ectopic expression of the AG family member PLENA transforms sepals into carpels, but ectopic expression of its paralog FARINELLI (FAR) does not 52 . The different loss of function phenotypes in the two genes show that they have adopted different functions 52 .…”

Section: Flowering Plant Evolutionmentioning

confidence: 99%

Gene duplications, robustness and evolutionary innovations

Wagner

2008

BioEssays

118

View full text Add to dashboard Cite

Gene duplications, robustness and evolutionary innovations Gene duplications, robustness and evolutionary innovations AbstractMutational robustness facilitates evolutionary innovations. Gene duplications are unique kinds of mutations, in that they generally increase such robustness. The frequent association of gene duplications in regulatory networks with evolutionary innovation is thus a special case of a general mechanism linking innovation to robustness. The potential power of this mechanism to promote evolutionary innovations on large time scales is illustrated here with several examples. These include the role of gene duplications in the vertebrate radiation, flowering plant evolution and heart development, which encompass some of the most striking innovations in the evolution of life. Gene duplications, robustness, and evolutionary innovationsAndreas Wagner AbstractMutational robustness facilitates evolutionary innovations in biological systems. Gene duplications are unique kinds of mutations, in that they generally increase such robustness. The frequent association of gene duplications in regulatory networks with evolutionary innovation thus exemplifies a general mechanism linking innovation to robustness. I illustrate the potential power of this mechanism on large time scales with the role of gene duplications in the vertebrate radiation, flowering plant evolution, and heart development, which encompass some of the most striking innovations in the evolution of life. Mutational robustnessMutational robustness is a biological's system ability to withstand mutations. Such robustness exists on multiple levels of biological organization. A case in point are random mutagenesis experiments of various proteins. They suggest that only a small fraction of mutations affect protein function adversely. For instance, a study of the bacteriophage T4 lysozyme generated more than 2000 random amino acid changes in the protein. Only 16% of them affected lysozyme function 1 . Other examples come from regulatory gene networks, such as the molecular network specifying fruit fly segments. Such networks may tolerate much quantitative variation in interactions among network genes 2-5 . Examples at the highest level of organization include macroscopic traits. Even substantial genetic variation -ultimately caused by mutations -may leave such traits unchanged. Take the vulva of the nematode worms Caenorhabditis elegans and Pristionchus pacificus 6 . These organisms shared a common ancestor 200-300 million years ago. Their vulvae are very similar, yet the genetic and cellular networks producing them have diverged greatly. For example, whereas in C. elegans one specific cell -the anchor cell -induces vulva development, multiple gonadal cells are responsible for this induction in P. pacificus 7 . Similarly, the same key signaling molecules, such as Wnt, may play a positive role in the network for vulval induction in C. elegans, but a negative role in P. pacificus 8,9 . In sum, mutational robustness is everywhere, from proteins to or...

show abstract

Patterns of Gene Duplication and Functional Evolution During the Diversification of theAGAMOUSSubfamily of MADS Box Genes in Angiosperms

Cited by 386 publications

References 105 publications

Phylogenetic Analyses of Basal Angiosperms Based on Nine Plastid, Mitochondrial, and Nuclear Genes

Phylogenetic Analyses of Basal Angiosperms Based on Nine Plastid, Mitochondrial, and Nuclear Genes

An ortholog of MIXTA‐like2 controls epidermal cell shape in flowers of Thalictrum

Gene duplications, robustness and evolutionary innovations

Contact Info

Product

Resources

About