Telomerase activity is not related to life history stage in the jellyfish Cassiopea sp.

Ojimi, Michiko C.; Isomura, Naoko; Hidaka, Michio

doi:10.1016/j.cbpa.2008.10.008

Cited by 20 publications

(10 citation statements)

References 23 publications

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“…However, since telomere lengths vary with age and tissue type, more controlled comparisons are needed. Some data on telomere lengths are also available for a few species in other vertebrate and invertebrate groups, including jellyfish, molluscs, insects, reptiles, sea urchins, fish and reptiles, 1 , 7–13 and plants 14 …”

Section: Telomere Lengthmentioning

confidence: 99%

Telomeres and life histories: the long and the short of it

Monaghan

2010

Annals of the New York Academy of Sciences

238

272

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Telomeres are repetitive DNA sequences at the ends of eukaryote chromosomes. Telomere loss limits the number of times cells can divide and is intimately involved in cell loss and renewal. Average telomere length in cell samples generally declines with donor age but shows substantial intraspecific variation. Telomeres are potentially of great interest to evolutionary biologists since the balance of fitness costs and benefits associated with loss and restoration is linked to the biology of life span. Most telomere research is done in the context of human disease. Recently, however, there has been a burgeoning of interest in telomere dynamics in healthy organisms. The extent to which variation in telomere loss might be involved in the evolution of life histories, and constrain or underpin life history trade-offs, is a growing field of research. I discuss what we do and do not know about the links between telomere length and life histories and the extent to which variations in telomere length and loss rate are useful indicators of aging-related changes and/or the biological state of individuals.

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Section: Telomere Lengthmentioning

confidence: 99%

Telomeres and life histories: the long and the short of it

Monaghan

2010

Annals of the New York Academy of Sciences

238

272

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“…Studies on longevity and senescence in the jellyfi sh Cassiopea spp. have uncovered telomerase activity in somatic tissues of both the polyp and medusa stages (Ojimi et al, 2009). In several species of coral telomere lengths were greater than 19 kb (Zielke, Bodnar, 2010).…”

Section: Introductionmentioning

confidence: 99%

Karyotyping and single-gene detection using fluorescence in situ hybridization on chromosomes of Hydra magnipapillata (Cnidaria: Hydrozoa)

Anokhin¹,

Hemmrich-Stanisak²,

Bosch³

2010

CCG

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Abstract. The fresh water polyp Hydra L., 1758 (Cnidaria, Hydrozoa) plays a key role as a model organism in modern evolutionary and developmental biology. A complete genome sequence has been published recently for Hydra magnipapillata Ito, 1947 and molecular data are rapidly accumulating in the literature, but little information is available on its chromosomes. In this study, an effi cient fl uorescence in situ hybridization (FISH) method is described for H. magnipapillata which not only allows identifi cation of the chromosomes but also visualization of the location of individual genetic loci. Together with cDNA and genomic sequencing this may provide the foundation for increasingly precise genetic and physical mapping in this basal metazoan model organism.

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“…In addition to the ones already mentioned, this includes various species of jellyfish (Hofmann and Gottlieb, 1991;Stibor and Tokle, 2003;Ojimi et al, 2009), sea anemones (Hand and Uhlinger, 1995;Burton and Finnerty, 2009), sponges (Ereskovsky and Tokina, 2007), annelids (Berrill, 1952 (Mladenov et al, 1983;Bosch et al, 1989) and snails (Neiman et al, 2005;Jokela et al, 2009;Neiman et al, 2010), as well as selffertilizing or vegetatively reproducing plants ( Van Der Hulst et al, 2003;Monteuuis et al, 2008;Verhoeven et al, 2010). Tracking individual protists or bacteria is experimentally difficult, but in principle SAPling could be used for recording data on these organisms as well.…”

Section: Resultsmentioning

confidence: 99%

“…Asexual organisms also raise interesting questions in the field of aging research, as studies in hydra (Bell, 1984;Martínez, 1998;Yoshida et al, 2006;Estep, 2010), flatworms (Child, 1911;Sonneborn, 1930;Haranghy and Balázs, 1964;Martínez and Levinton, 1992), jellyfish (Ojimi et al, 2009) and annelids (Bell, 1984;Martínez and Levinton, 1992;Martínez, 1996) conflict on whether these regenerative animals undergo senescence in their asexual state or whether a correlation exists between aging and sexual reproduction. It has, however, been shown that senescence does occur in bacteria and yeast using a large-scale approach involving hundreds of specimens over many generations (Barker and Walmsley, 1999;Lai et al, 2002;Stewart et al, 2005;Ackermann et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

SAPling: a Scan-Add-Print barcoding database system to label and track asexual organisms

Thomas

Schötz

2011

Journal of Experimental Biology

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SUMMARYWe have developed a 'Scan-Add-Print' database system, SAPling, to track and monitor asexually reproducing organisms. Using barcodes to uniquely identify each animal, we can record information on the life of the individual in a computerized database containing its entire family tree. SAPling has enabled us to carry out large-scale population dynamics experiments with thousands of planarians and keep track of each individual. The database stores information such as family connections, birth date, division date and generation. We show that SAPling can be easily adapted to other asexually reproducing organisms and has a strong potential for use in large-scale and/or long-term population and senescence studies as well as studies of clonal diversity. The software is platform-independent, designed for reliability and ease of use, and provided open source from our webpage to allow project-specific customization.Supplementary material available online at

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Telomerase activity is not related to life history stage in the jellyfish Cassiopea sp.

Cited by 20 publications

References 23 publications

Telomeres and life histories: the long and the short of it

Telomeres and life histories: the long and the short of it

Karyotyping and single-gene detection using fluorescence in situ hybridization on chromosomes of Hydra magnipapillata (Cnidaria: Hydrozoa)

SAPling: a Scan-Add-Print barcoding database system to label and track asexual organisms

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