2017. Dependent on the level of comparison four types of homology are defined: (1) Iterative ( = serial = homonomy), (2) ontogenetic, (3) di- or polymorphic, and (4) supraspecific homology. 42. There are many examples of homologous structures that develop from nonhomologous developmental precursors (Wagner 1989). Drosophila paradigm regarding the unique presence of wing-related tissues in T2 and T3, it came as a surprise when additional 1988. However, because anatomical annotations are to taxa, the data could potentially be referred to a phylogeny of choice to infer the ancestral taxon. 2007a; also see Vogt 2008, 2018a; Vogt et al. It is the Hox genes' job to locate different structures inside the organism's body plan. Morphogens, compartments, and pattern: lessons from drosophila? 2 and 3) are described in relation to each competency question and in Table 4. These grouping classes are designated with the in_subset: homology_grouping tag, but are not logically related as homologous and do not include evidence or attribution. Many of the genes in this class encode transcription factors. Two important messages can be obtained from the wing (serial) homolog studies: (i) as mentioned, wing serial homologs are widespread, and (ii) wing serial homologs can have drastically different morphologies from each other. Assertions about homology in the literature sometimes also take the form of rejecting or discounting a homology relationship between structures. 35, another critical wing marker gene Furthermore, although some of our personas expected results were missing, REA returned no incorrect answers for our test data. How can we differentiate the 12). General homology characterized the relationship of certain structures . Onthophagus beetles requires the leg gene network for its formation, but it does not transform into the leg upon Hox LOF mutation 46 have shown that evo-devo analyses can provide critical information for the study of insect wing origin, thus establishing a basis for the expansion of our analysis of insect wing origin beyond the winged insects and even beyond Insecta. The classic example is the forelimb, where the same basic arrangement is seen in things as dissimilar as . 2016). 2007. de novo structures (also, see Box 3 of Although a researcher might use these data in a number of different ways, the data required will generally be a matrix of taxa and anatomical phenotypes. 2014. Therefore, investigating 1997. The seminal studies in non-insect arthropods performed by Averof and colleagues provided evidence for a pleural origin of insect wings These results are consistent with OWL entailments of the respective models. Blattella SubpropertyA relationship defined in an ontology that is a more specific subtype of its parent relationship. Drosophila as an example to discuss how we can apply the above-mentioned evo-devo concept to the identification of serially homologous structures. a relational term in the comparison of species"), which restricts the use of homology to supraspecific comparison only, is not historically founded. In competency question 4, rectangles represent anatomy terms and ovals represent taxonomy terms. Currently, in multispecies anatomy ontologies such as Uberon (Haendel et al. By aggregating expert knowledge of different anatomical structures and organisms, they are a key resource for comparative analysis. 5. Most often these properties involve structural criteria but developmental and functional ones are employed, too. OWL instances representing organism phenotype annotations were created using the Protg OWL editor, following the EntityQuality model (Mungall et al. Owing to this highly derived body plan, The application of molecular and functional approaches (an evo-devo approach) may allow us to identify hidden wing serial homologs in wingless segments, which could provide us with critical information to unveil the origin of insect wings. Drosophila 2016), or even phenotype-based genomic identification (Lippert et al. 11). For example, the stapes, an inner ear bone in mammals, is the undisputed homolog of the hyomandibula, a jaw bone in fishes. These results are consistent with OWL entailments of the respective models. The species depicted here are as follows: Crustacea: the amphipod, The discovery of similar anatomical features that arose independently in evolution and yet are underlain by homologous genes and networks has given pause to many investigators focused on homology at the structural level. 32. 33. Since there are no obvious wing-like structures outside of the second and third thoracic segments (T2 and T3) in insects, only a handful of structures (such as mayfly gills and termite paranotal expansions) have been proposed to be wing serial homologs Using ontology-based reasoning to integrate taxon and gene phenotypes, the team has demonstrated the discovery of candidate genes underlying evolutionarily novel phenotypes (Edmunds et al. Differential recruitment of limb patterning genes during development and diversification of beetle horns. 2014): positional similarity evidence (ECO:0000060), compositional similarity evidence (ECO:0000063), developmental similarity evidence (ECO:0000067), morphological similarity evidence (ECO:0000071), gene expression similarity evidence (ECO:0000075), and structural similarity evidence (ECO: 0000027). In this review, we discuss how the wing serial homologs identified in recent evo-devo studies have provided a new angle through which this century-old conundrum can be explored. . Upon Hox LOF mutations, a new set of As discussed in the previous section, tissue function can diverge among serially homologous structures, which means that the expression of the first class of marker genes likely differs even among serially homologous tissues if the function of these tissues is different. As with anatomical structures, homology between protein or DNA sequences is defined in terms of shared ancestry. 43). 18. The biological basis of homology In: Humphries C.J., editor. Advances in this area have been made using semantic reasoning but these have not explicitly incorporated nor evaluated homology reasoning. Phenoscape has annotated 22,000 anatomical character states to 5000 vertebrates from the comparative evolutionary literature and integrated the resulting more than half a million taxon phenotypes with approximately 400K gene phenotype annotations from model organisms (zebrafish, mouse, Xenopus, and human) into its knowledgebase. 45 and in non-winged hexapods Malone J., Holloway E., Adamusiak T., Kapushesky M., Zheng J., Kolesnikov N., Zhukova A., Brazma A., Parkinson H.. Pleuron (pl. A DL query is an OWL expression logically describing a class for which we want to find its subclasses or instances. A) bristletail tergal edge, cockroach lateral pronotum, beetle T1 carinated margin, beetle pupal gin-trap, and treehopper helmet and ( The Phenoscape project was incubated starting in 2007 at the National Evolutionary Synthesis Center (NSF 0905606 and 0423641) and has been directly supported by NSF awards 1062404, 1062542, 0641025, and 1661529. These results strongly suggest that, although their shape and function are drastically different from those of wings, the For testing the AVA model, we used locally defined properties for historical_homology_member_of and has_historical_homology_member (and corresponding relations for serial homology), as these are not currently defined in the Relation Ontology. 2011). The gin-trap structure is also observed in lepidopteran pupae; however, the evolutionary and developmental relationship between coleopteran and lepidopteran gin-traps is currently unknown. For example, tracing the development of wings and wing serial homologs will help us determine the developmental events that differentiate wings from other wing serial homologs and also will allow us to investigate the developmental origin of wings and wing serial homologs (such as tergal or pleural or both). Modulating Hox gene functions during animal body patterning. Prud'homme B, Minervino C, Hocine M, et al. Given that many of the dorsal wing serial homologs are modified body wall structures, the body wall character state appears to be more plesiomorphic (that is, retaining ancestral morphologies) among the dorsal wing serial homologs (albeit with varying degrees of modification), whereas insect wings may be an apomorphic version of this trait ( Collaboration among various fields, including paleontology and evo-devo, will be fruitful to tackle this century-old question regarding the evolutionary origin of insect wings. vestigial ( Later, through expression analyses in basal insects, Niwa Shou S., Scott V., Reed C., Hitzemann R., Stadler H.S.. Under the AVA model, a query for homologs of pectoral fin return both forelimb and hindlimb because of the semantics of the homology axiom: every paired fin homologous_toevery limb. Here, because pectoral fin is a type of paired fin, and under the relationship where paired fin is homologous to limb, the outcome includes both subtypes of limb, the forelimb (true historical homolog) and hindlimb (not historical homolog). The demonstration ontology workflow is available on GitHub in the homology-annotations-demo project (https://github.com/phenoscape/homology-annotations-demo). This is sometimes referred to as all-some semantics. Jr., Mungall C.J., Smith B.. The full collection of homology assertions and associated provenance metadata is publicly available at http://purl.org/phenoscape/demo/phenoscape_homology.owl and in Supplementary material S1 available on Dryad (see Software and Data Availability section). Evolutionary constraints on digit numbers. 45. Tribolium suggest that the primordia that give rise to wings and wing serial homologs are induced similarly in each segment during embryogenesis Reasoning/semantic reasoningThe use of logic to derive facts or conclusions that are not explicitly stated in an ontology or model. 22, Along with attribution for each statement, we recorded the type of evidence that supported or rejected a historical or serial homology relationship (Dahdul et al. 2009; Dahdul et al. Here, we restricted reasoning across development because of the widely recognized disconnect between homology at different levels of biological organization: homology at one level does not necessitate homology at another (Striedter and Northcutt 1991; Roth 1994; Abouheif et al. To evaluate the two homology models and demonstrate how they differ, we assembled a set of phenotypes for fish fins and tetrapod limbs and, as per above, a corresponding set of homology assertions among the relevant entities. Drosophila melanogaster. The expression of this class of marker genes tends to start at the beginning of the tissue induction process and often continues throughout the development of the resulting tissue. Modeling in OWL frequently involves a tradeoff between expressivity and reasoner performance on large ontologies. These merged files are small enough to be queried within Protg using the HermiT OWL-DL reasoner (Glimm et al. Glimm B., Horrocks I., Motik B., Stoilos G., Wang Z.. However, if desirable and practical in the future, the AVA model could support the ternary representation by specifying an ontological class of the ancestral structure. As mentioned, morphologically, wings are unique to the two thoracic segments (T2 and T3) in extant insects, including Because of this well-established : Body plan innovation in treehoppers through the evolution of an extra wing-like appendage. Assertions of homology and statements of lack thereof among the skeletal elements of vertebrates were extracted from the phylogenetic literature on teleost fishes and early sarcopterygians (Dececchi et al. Although it is possible to encode the negation of a homology relationship in OWL using a Manchester syntax expression such as not (homologous_to some X), we typically only have these not assertions when there is a corresponding is homologous_to statement. Evolution of insect wings and development - new details from Palaeozoic nymphs. They do not expect the subtype of the search term (hind flipper) to be returned, or the historical homologs of the serial homolog (pectoral fin) to be returned. These authors designed an algorithm, implemented in the software Homolonto (Parmentier et al.