Full paperInterspecific hybridization between an anural and urodele ascidian: Differential expression of urodele features suggests multiple mechanisms control anural development
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2021, Current Topics in Developmental BiologyCitation Excerpt :In one ascidian family, the Molgulidae, tailless ascidians have independently evolved several times (Huber, Burke da Silva, Bates, & Swalla, 2000; Maliska, Pennell, & Swalla, 2013). We are investigating two closely related species, Molgula oculata and Molgula occulta that hybridize easily in the lab (Fig. 4; Swalla & Jeffery, 1990, 1996; Swalla, Makabe, Satoh, & Jeffery, 1993). M. oculata is a tailed ascidian, similar to other solitary ascidian larvae, such as Ciona.
Tunicate gastrulation
2020, Current Topics in Developmental BiologyCitation Excerpt :In fact, presumptive notochord cells in chobi are transfated to endoderm, further evidencing the robustness of the endoderm invagination mechanisms to perturbations (Sherrard et al., 2010), in this case to increased cell number. Likewise, a number of species of ascidians have been described that differ from the conventional body plan in having no tail, and reduced numbers of notochord and tail muscle cells—the best described of these being Molgula occulta (Swalla & Jeffery, 1990; Swalla, Makabe, Satoh, & Jeffery, 1993). Nevertheless, these tailless species gastrulate and close their blastopores.
The Comparative Organismal Approach in Evolutionary Developmental Biology. Insights from Ascidians and Cavefish
2016, Current Topics in Developmental BiologyCitation Excerpt :The rescue of urodele features in interspecific hybrids shows that anural development is controlled in large part by changes in zygotic processes. However, maternal processes may also be involved, as evidenced by the inability of the tailed species genome to restore the entire program of terminal cell divisions in the notochord and muscle lineages (Swalla & Jeffery, 1991) and by differences in cytoplasmic localization in eggs of the tailless species (Swalla, Badgett, & Jeffery, 1991). The Molgula model also illustrates the importance of heterochrony (relative changes in the timing of developmental events) and cell death (apoptosis) in the evolution of development.
Analysis of large scale expression sequenced tags (ESTs) from the anural ascidian, Molgula tectiformis
2007, Developmental BiologyProgrammed cell death in the ascidian embryo: Modulation by FoxA5 and Manx and roles in the evolution of larval development
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This research was supported by an American Association of University Women postdoctoral fellowship to B.J.S. and N.S.F. (DCB-84116763) and NIH (HD-13970) grants to W.R.J.
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Present address: University of California, Bodega Marine Laboratory, Box 247, Bodega Bay, CA 94923.