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• W1716549302 endingPage "533" @default.
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• W1716549302 abstract "The proximo-distal axis of the arthropod leg is patterned by mutually antagonistic developmental expression domains of the genes extradenticle, homothorax, dachshund, and Distal-less. In the deutocerebral appendages (the antennae) of insects and crustaceans, the expression domain of dachshund is frequently either absent or, if present, is not required to pattern medial segments. By contrast, the dachshund domain is entirely absent in the deutocerebral appendages of spiders, the chelicerae. It is unknown whether absence of dachshund expression in the spider chelicera is associated with the two-segmented morphology of this appendage, or whether all chelicerates lack the dachshund domain in their chelicerae. We investigated gene expression in the harvestman Phalangium opilio, which bears the plesiomorphic three-segmented chelicera observed in “primitive” chelicerate orders. Consistent with patterns reported in spiders, in the harvestman chelicera homothorax, extradenticle, and Distal-less have broadly overlapping developmental domains, in contrast with mutually exclusive domains in the legs and pedipalps. However, unlike in spiders, the harvestman chelicera bears a distinct expression domain of dachshund in the proximal segment, the podomere that is putatively lost in derived arachnids. These data suggest that a tripartite proximo-distal domain structure is ancestral to all arthropod appendages, including deutocerebral appendages. As a corollary, these data also provide an intriguing putative genetic mechanism for the diversity of arachnid chelicerae: loss of developmental domains along the proximo-distal axis." @default.
• W1716549302 created "2016-06-24" @default.
• W1716549302 creator A5025937537 @default.
• W1716549302 creator A5035930381 @default.
• W1716549302 creator A5037847107 @default.
• W1716549302 creator A5081182542 @default.
• W1716549302 date "2012-11-01" @default.
• W1716549302 modified "2023-09-27" @default.
• W1716549302 title "Evolution of the chelicera: a<i>dachshund</i>domain is retained in the deutocerebral appendage of Opiliones (Arthropoda, Chelicerata)" @default.
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• W1716549302 doi "https://doi.org/10.1111/ede.12005" @default.
• W1716549302 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23134210" @default.
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