Self or Non—self Recognition in Compound Ascidians

Watanabe, Hiroshi; Taneda, Yasuho

doi:10.1093/icb/22.4.775

Cited by 40 publications

(13 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The colonies with common vascular systems (integrated colonies) represent the highest degree of colonial adaptation, allowing colony specificity and allorecognition reactions (Watanabe and Taneda, 1982;Rinkevich, 2005). Most integrated colonies in our dataset appeared in the cladograms in a single clade that grouped Botryllinae and Symplegma (plus the aggregated species Stolonica socialis in the COI and total evidence trees).…”

Section: Discussionmentioning

confidence: 98%

Phylogeny of the families Pyuridae and Styelidae (Stolidobranchiata, Ascidiacea) inferred from mitochondrial and nuclear DNA sequences

Pérez‐Portela

Bishop

Davis

et al. 2009

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

a b s t r a c tThe Order Stolidobranchiata comprises the families Pyuridae, Styelidae and Molgulidae. Early molecular data was consistent with monophyly of the Stolidobranchiata and also the Molgulidae. Internal phylogeny and relationships between Styelidae and Pyuridae were inconclusive however. In order to clarify these points we used mitochondrial and nuclear sequences from 31 species of Styelidae and 25 of Pyuridae. Phylogenetic trees recovered the Pyuridae as a monophyletic clade, and their genera appeared as monophyletic with the exception of Pyura. The Styelidae, on the other hand, appeared as a paraphyletic group split into several clades. One of them was formed by solitary oviparous species, of which the Pyuridae were a sister group. A second clade included the colonial genera Botryllus, Botrylloides and Symplegma. The remaining colonial and solitary genera formed several poorly resolved clades. One of the more species genus, Polycarpa, was shown to be polyphyletic, and the species Styela plicata grouped into two genetically distant clades suggesting the existence of two cryptic species. The internal phylogeny of Styelidae has bearings on the origin of coloniality in this family. We suggest to abandon the traditional division of colonial forms into social and compound species and use instead the categories of aggregated colonies that do not have common vascular systems, and integrated colonies, that do possess such systems. Our molecular results indicate that there have been several independent acquisitions of coloniality in the Styelidae, and that viviparity may be a pre-adaptation for a colonial life-style.

show abstract

Section: Discussionmentioning

confidence: 98%

Phylogeny of the families Pyuridae and Styelidae (Stolidobranchiata, Ascidiacea) inferred from mitochondrial and nuclear DNA sequences

Pérez‐Portela

Bishop

Davis

et al. 2009

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

show abstract

“…genetically composite entities (Sommerfeldt et al 2003, Rinkevich 2005. In Botryllinae (Family Styelidae) and Perophoridae, zooids within colonies are linked by common vascular systems (Bishop & Sommerfeldt 1999, Pérez-Portela et al 2009) that fuse when chimeras are formed, thereby allowing haemolymph cells from different genotypes to circulate between fusion partners (Watanabe & Taneda 1982, Koyama & Watanabe 1986). In P. japonica fusion of different stolons of the same colony has been documented during the growth of reared colonies (Koyama & Watanabe 1981, 1986) and presumably results in the lattice-like array of interconnected stolons seen in wild colonies.…”

Section: Discussionmentioning

confidence: 99%

Bottlenecks and loss of genetic diversity: spatio-temporal patterns of genetic structure in an ascidian recently introduced in Europe

Pérez‐Portela¹,

Turon²,

Bishop³

2012

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

We explored temporal patterns of genetic diversity and spatial genetic structure of the recently introduced ascidian Perophora japonica Oka, 1927 in Europe. A fragment of the mitochondrial gene cytochrome c oxidase subunit I (COI) was sequenced for 291 colonies of one population in Plymouth, UK, which was monitored for 9 yr after its initial discovery. A total of 238 colonies from 12 localities were also sequenced for population structure analyses. The temporal monitoring of the Plymouth population showed a progressive loss of genetic diversity over time attributable to a strong initial bottleneck followed by genetic drift and/or selection. Population genetic structure was consistent with the historical records of this introduction, which probably originated from oyster farming activities in France, from where the species spread to the UK and Spain. Only one population in France displayed high levels of genetic diversity, and most of the remaining populations presented very low variability. In addition, significant differentiation in terms of allele frequencies was detected between some populations. P. japonica has suffered a loss of genetic diversity in both space and time since its introduction, but this did not prevent its expansion. Accidental human transport is the most likely mechanism of spread within the introduced range. Asexual propagation modes and chimerism in this species may play an important role in introduction events. The genetic data presented here can contribute to the design of more efficient management methods for this and similar introduced species.

show abstract

“…A humod activity that induces allespecific rejection has been derived from the blood plasma of colonies and has been partially characterized (Taneda and Watanabe, 1982;Saito and Watanabe, 1984). Although it is uncertain what type(s) of cell recognizes the allogeneic factor, it seems that the infiltration of blood cells (particularly morula cells) may represent a primary response following allogeneic recognition.…”

Section: Discussionmentioning

confidence: 99%

“…This type of allogeneic recognition is called colony specificity (reviewed in Watanabe and Taneda, 1982;Taneda et al 1985).…”

Section: Introductionmentioning

confidence: 99%

Allogeneic rejection induced by cut surface contact in the compound ascidian,Botrylloides simodensis

Hirose¹,

Saito²,

Watanabe³

1990

Invertebrate Reproduction & Development

Self Cite

View full text Add to dashboard Cite

Invertebrate Reproduction and Development, 17:2 (1 990) 159-1 64 Balaban, Philadelphia/Rehovot 0168-8170190 603.50 8 1990 Balaban Allogeneic rejection induced by cut surface contact in the compound ascidian, Botrylloides simodensis SummaryIn Botrylloides simodensis, an acute intensive rejection occurred within a day, after incompatible allogeneic colonies were brought into contact with each other at their cut surfaces. From histological and ultrastructural studies, these rejection processes took the following sequence: 1) At the contact area, the tunics facing each other seemed to fuse. 2) Blood cells @articularly morula cells) infiltrated into the tunic and migrated to the contact area. 3) Infiltrating morula cells lysed in the tunic and discharged eosinophilic and electron dense substances. In electron micrographs, electron dense filaments appeared in the tunic around the lysing cells. These filaments appeared as bundles of test mamx material to which the discharged substances bound. 4) Finally, a new wall appeared in the tunic, separating the contact area from each colony. Ultrastructurally, the new barrier was a continuous thin dense structure composed of electron dense fibrous elements.

show abstract

Self or Non—self Recognition in Compound Ascidians

Cited by 40 publications

References 7 publications

Phylogeny of the families Pyuridae and Styelidae (Stolidobranchiata, Ascidiacea) inferred from mitochondrial and nuclear DNA sequences

Phylogeny of the families Pyuridae and Styelidae (Stolidobranchiata, Ascidiacea) inferred from mitochondrial and nuclear DNA sequences

Bottlenecks and loss of genetic diversity: spatio-temporal patterns of genetic structure in an ascidian recently introduced in Europe

Allogeneic rejection induced by cut surface contact in the compound ascidian,Botrylloides simodensis

Contact Info

Product

Resources

About