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Early Evolution of the T-Box Transcription Factor Family

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Early Evolution of the T-Box Transcription Factor Family Early evolution of the T-box transcription factor family Arnau Sebé-Pedrósa,b,1, Ana Ariza-Cosanoc,1, Matthew T. Weirauchd, Sven Leiningere, Ally Yangf, Guifré Torruellaa, Marcin Adamskie, Maja Adamskae, Timothy R. Hughesf, José Luis Gómez-Skarmetac,2, and Iñaki Ruiz-Trilloa,b,g,2 aInstitut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), 08003 Barcelona, Spain; bDepartament de Genètica, Universitat de Barcelona, 08028 Barcelona, Spain; cCentro Andaluz de Biología del Desarrollo, Consejo Superior de Investigaciones Científicas, Universidad Pablo de Olavide-Junta de Andalucía, 41013 Sevilla, Spain; dCenter for Autoimmune Genomics and Etiology and Divisions of Rheumatology and Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229; eSars International Centre for Marine Molecular Biology, 5008 Bergen, Norway; fTerrence Donnelly Centre and Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada M5S 3E1; and gInstitució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain Edited by W. Ford Doolittle, Dalhousie University, Halifax, NS, Canada, and approved August 13, 2013 (received for review May 24, 2013) Developmental transcription factors are key players in animal and metazoan Brachyury genes and whether T-box genes are multicellularity, being members of the T-box family that are present in other unicellular lineages remained unclear. among the most important. Until recently, T-box transcription Here, we report a taxon-wide survey of T-box genes in several factors were thought to be exclusively present in metazoans. eukaryotic genomes and transcriptomes, including previously Here, we report the presence of T-box genes in several nonmeta- undescribed genomic data from several close relatives of meta- zoan lineages, including ichthyosporeans, filastereans, and fungi. zoans, such as the other known filasterean species (Ministeria Our data confirm that Brachyury is the most ancient member of vibrans) and several ichthyosporean taxa (17), as well as genomic the T-box family and establish that the T-box family diversified at data from calcarean sponges. We identify T-box genes in M. vibrans, the onset of Metazoa. Moreover, we demonstrate functional con- in all of the ichthyosporeans, and in several early-branching Fungi. servation of a homolog of Brachyury of the protist Capsaspora Our data pinpoints with unprecedented detail the evolutionary fi owczarzaki in Xenopus laevis. By comparing the molecular pheno- history of T-box transcription factors. We also con rm that C. owczarzaki Brachyury is the founding member of the T-box family and de- type of Brachyury with that of homologs of early fi branching metazoans, we define a clear difference between uni- ne previously undescribed classes of T-box genes. cellular holozoan and metazoan Brachyury homologs, suggesting To obtain a glimpse into the functional conservation of the EVOLUTION that the specificity of Brachyury emerged at the origin of Metazoa. earliest Brachyury genes, we perform heterologous expression experiments of the Brachyury homologs from C. owczarzaki, Experimental determination of the binding preferences of the Sycon ciliatum (Calcarea, Porifera), and Nematostella vectensis C. owczarzaki Brachyury results in a similar motif to that of meta- (Anthozoa, Cnidaria) in Xenopus laevis, a well-established model zoan Brachyury and other T-box classes. This finding suggests that fi system for studying Brachyury (4, 7, 18). Our data show that functional speci city between different T-box classes is likely C. owczarzaki Brachyury (CoBra) can partially rescue Xenopus achieved by interaction with alternative cofactors, as opposed to fi laevis embryos injected with a dominant negative XBra construct. differences in binding speci city. However, CoBra, contrary to S. ciliatum Bra (SciBra)and N. vectensis Bra (NvBra), activates target genes known to be origin multicellularity | premetazoan evolution | subfunctionalization | regulated by other T-box gene classes, but not by Brachyury. Porifera | Holozoa We also use protein-binding microarrays to demonstrate that ranscriptional regulation is a central aspect of animal de- Significance Tvelopment. Thus, deciphering the early evolution of metazoan transcription factors is vital for achieving a better understanding The T-box transcription factors are key players in animal de- of the origin of animals. The T-box family of genes is among the velopment and they were considered strictly animal-specific. most important developmental transcription factors present in We show that T-box genes have instead an important pre- Metazoa. This family is characterized by an evolutionary con- – metazoan evolutionary history, being present in several non- served DNA-binding domain of 180 200 amino acids, known as the metazoan unicellular taxa. Notably, we find that Capsaspora – T-box domain (1 3). Brachyury is the founding and best-charac- owczarzaki, a unicellular relative of animals, has a Brachyury terized member of the T-box family, with well-established roles in homolog functionally conserved with metazoans. Through fi blastopore speci cation, mesoderm differentiation and, in chor- experiments in Xenopus, we demonstrate that C. owczarzaki – dates, notochord formation (4 6). It has been hypothesized that Brachyury lacks, however, the target specificity displayed by the ancestral role of Brachyury was primarily that of blastopore metazoan Brachyury homologs, including sponges. This sug- determination and gastrulation (5, 7). gests that the subfunctionalization of T-box classes was Other T-box classes include Tbx4/5, Tbx6, Tbx2/3, Eomes, and established at the onset of Metazoa through new interactions Tbx1/15/20. With only a few exceptions (8), all classes of T-box with cofactors, concomitantly with the diversification of the genes are widespread among bilaterian animals, with a handful T-box family. being identified and studied in nonbilaterian metazoans, such as – cnidarians (5, 9), ctenophores (7, 10), and sponges (11 14). Author contributions: A.S.-P., T.R.H., J.L.G.-S., and I.R.-T. designed research; A.S.-P., T-box genes were initially thought to be specific to metazoans A.A.-C., M.T.W., and A.Y. performed research; S.L., G.T., M. Adamski, and M. Adamska (13, 15), but two recent studies revealed the presence of T-box contributed new reagents/analytic tools; A.S.-P., A.A.-C., M.T.W., T.R.H., J.L.G.-S., genes in nonmetazoan lineages (14, 16), including the uni- and I.R.-T. analyzed data; and A.S.-P., M.T.W., T.R.H., J.L.G.-S., and I.R.-T. wrote cellular filose amoeba Capsaspora owczarzaki, a close relative the paper. of animals, and the chytrid fungus Spizellomyces punctatus. The authors declare no conflict of interest. T-box genes were not identified in any other sequenced eu- This article is a PNAS Direct Submission. karyote, suggesting that T-box genes were secondarily lost in Freely available online through the PNAS open access option. choanoflagellates (both in unicellular and colonial species) 1A.S.-P. and A.A.-C. contributed equally to this work. and most fungi. Interestingly, one of the T-box genes identi- 2To whom correspondence may be addressed. E-mail: [email protected] or fied in C. owczarzaki is a homolog of Brachyury, making it the [email protected]. fi only Brachyury gene identi ed outside of metazoans to date This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. (16). However, the degree of conservation between C. owczarzaki 1073/pnas.1309748110/-/DCSupplemental. www.pnas.org/cgi/doi/10.1073/pnas.1309748110 PNAS Early Edition | 1of6 Downloaded by guest on September 29, 2021 the binding specificity of CoBra is indistinguishable from that ichthyosporeans lack most of the known functional T-box of metazoan Brachyury and other T-box genes. Together, our domain amino acids (Fig. S2). data suggest that the subfunctionalization of Brachyury and Our tree also deciphers a previously undescribed class of T- other T-box classes is due to changes in interactions with boxes (Tbx7), which includes the remaining (non-Brachyury) cofactors, as opposed to changes in the DNA-binding recog- filasterean and ichthyosporean T-box genes, as well as homologs nition motif and that this subfunctionalization occurred at the from sponges (S. ciliatum, Leucosolenia complicata,andAmphi- origin of the Metazoa, concomitant with the diversification of medon queenslandica)(Fig.1andFig. S1). Statistical support for the T-box family. this clade is not high, due to the short number of amino acids of the T-box domain, but the group is recovered by both maximum like- Results and Discussion lihood and Bayesian analyses. Included in the Tbx7 group there is Genomic Survey of T-Box Genes in Nonmetazoan Species. We have a C. owczarzaki T-box gene with two T-box DNA-binding domains, searched for T-box genes in recently sequenced eukaryotic aconfiguration not present in any reported T-box gene. This is, genomes and transcriptomes, including previously undescribed however, not uncommon in other eukaryotic transcription factor genomic and/or transcriptomic data from unicellular holozoans families. It has been hypothesized that multiple DNA-binding and calcarean sponges. This genomic survey has greatly extended domains can increase the length and diversity of DNA recognition the number of nonmetazoan taxa in which T-box genes have been motifs recognizable by the limited number of DNA-binding domain identified. Our analyses reveal that T-box genes are
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