Identification of four Indian ascidians based on COI gene sequences

Jaffarali, H Abdul; Akram, Soban; Arshan, Kaleem M L

doi:10.1080/24701394.2016.1233531

Cited by 3 publications

(3 citation statements)

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“…This result indicates that there was incursion of native and invasive ascidian populations to different parts of the world. A similar phylogenetic method was used for ascidian identification in other geographical regions as well (Iyappan, Ananthan, & Sathishkumar, 2016; Jaffarali, Akram, & Arshan, 2018; Lee & Shin, 2014; Smith, Cahill, & Fidler, 2010).…”

Section: Discussionmentioning

confidence: 99%

Identification and population genetic comparison of three ascidian species based on mtDNA sequences

Bhattachan

Qiao

Dong

2020

Ecology and Evolution

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Ascidians are sessile marine chordate invertebrates found along seashores worldwide and are typically regarded as invasive organisms. Knowledge concerning their global genetic structure and subsequent invasive potential is limited. Here, we identified three ascidians—Ciona robusta, Ciona savignyi, and Styela clava from the northeast region of China using morphological characteristics and mitochondrial cytochrome c oxidase subunit I (cox1) as genetic marker. We additionally used phylogenetics to aid in the identification of these three species. The results of a population genetic analysis showed that among the three species, the level of haplotype diversity was particularly high within C. savignyi, and nucleotide diversity varied moderately. We divided the three species separately into native and invasive populations using 170 cox1 sequences from global resources to explore population genetic structure and invasive potential. Although in the network analysis Ciona spp. formed haplogroups of native and invasive populations, some haplotypes were still shared. We found that the haplotypes did not cluster within the network of S. clava. Our AMOVA results also showed that Ciona spp. had a weak genetic structure, and less genetic differentiation was present in S. clava. These data suggest that there are extensive incursions of these three ascidians into different geographical regions. Global comparisons of ascidian populations will help in the understanding of their population genetic structure and invasive potential, hence providing important insights regarding conservation as well as management.

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Section: Discussionmentioning

confidence: 99%

Identification and population genetic comparison of three ascidian species based on mtDNA sequences

Bhattachan

Qiao

Dong

2020

Ecology and Evolution

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“…S2). It must be noted that DNA barcoding is recommended for the correct identification of ascidians (Jaffarali et al, 2018), and without this certainty the conservative nomenclature D. cf. molle is used herein.…”

Section: Study Site and Speciesmentioning

confidence: 99%

Expansion of a colonial ascidian following consecutive mass coral bleaching at Lizard Island, Australia

Tebbett

Streit

Bellwood

2019

Marine Environmental Research

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Mass coral bleaching is challenging today's coral reefs. However, our understanding of dynamics in benthic space holders, following such disturbances, is limited. To address this, we quantified successional dynamics of the ascidian, Didemnum cf. molle using a series of temporally and spatially matched photoquadrats across both the 2016 and 2017 mass coral bleaching events on the Great Barrier Reef. Unlike corals, D. cf. molle appeared to flourish in the warm temperatures and rapidly expanded. Indeed, colony density increased nearly 6-fold over two years with one quadrat experiencing an increase of over 1000 ind. m -2 . However, this increase did not simply track the increase in space due to coral mortality, but may have benefitted from reduced predation or increased nutrient availability following mass coral mortality. This study highlights the potential of D. cf molle to expand under bleaching conditions and to become a more prominent component of future reef configurations.

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“…Taxonomic identification of ascidians by morphology is also a problem, due to the shortage of expert taxonomists. This can be overcome with DNA barcoding, recently applied to Lissoclinum fragile and four Indian ascidians by sequencing a short segment of mitochondrial DNA coding for subunit 1 of cytochrome C oxidase [ 192 , 193 ].…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Ascidian Toxins with Potential for Drug Development

Watters

2018

Marine Drugs

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Ascidians (tunicates) are invertebrate chordates, and prolific producers of a wide variety of biologically active secondary metabolites from cyclic peptides to aromatic alkaloids. Several of these compounds have properties which make them candidates for potential new drugs to treat diseases such as cancer. Many of these natural products are not produced by the ascidians themselves, rather by their associated symbionts. This review will focus mainly on the mechanism of action of important classes of cytotoxic molecules isolated from ascidians. These toxins affect DNA transcription, protein translation, drug efflux pumps, signaling pathways and the cytoskeleton. Two ascidian compounds have already found applications in the treatment of cancer and others are being investigated for their potential in cancer, neurodegenerative and other diseases.

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Identification of four Indian ascidians based on COI gene sequences

Cited by 3 publications

References 20 publications

Identification and population genetic comparison of three ascidian species based on mtDNA sequences

Identification and population genetic comparison of three ascidian species based on mtDNA sequences

Expansion of a colonial ascidian following consecutive mass coral bleaching at Lizard Island, Australia

Ascidian Toxins with Potential for Drug Development

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