Radiation tolerance in the tardigrade Milnesium tardigradum

@article{Horikawa2006RadiationTI,
  title={Radiation tolerance in the tardigrade Milnesium tardigradum},
  author={Daiki D. Horikawa and Tetsuya Sakashita and Chihiro Katagiri and Masahiko Watanabe and Takahiro Kikawada and Yuichi Nakahara and Nobuyuki Hamada and Seiichi Wada and Tomoo Funayama and Seigo Higashi and Yasuhiko Kobayashi and Takashi Okuda and Mikinori Kuwabara},
  journal={International Journal of Radiation Biology},
  year={2006},
  volume={82},
  pages={843 - 848}
}
Purpose: Tardigrades are known to survive high doses of ionizing radiation. However, there have been no reports about radiation effects in tardigrades under culture conditions. In this study, we investigated tolerance of the tardigrade, Milnesium tardigradum, against gamma-rays and heavy ions by determining short-term or long-term survival, and reproductive ability after irradiation. Materials and methods: Hydrated and anhydrobiotic animals were exposed to gamma-rays (1000 – 7000 Gy) or heavy… 

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References

SHOWING 1-10 OF 18 REFERENCES

Radiation tolerance in the eutardigrade Richtersius coronifer

The study suggests that radiation tolerance in tardigrades is not due to biochemical protectants connected with the desiccated state, but may rely on efficient mechanisms of DNA repair, the nature of which is currently unknown.

Biological effects of anhydrobiosis in an African chironomid, Polypedilum vanderplanki on radiation tolerance

Results indicate that anhydrobiosis enhances radiotolerance, resulting in increases of successful metamorphoses, and did not protect against radiation damage in terms of producing viable offspring.

Cryptobiosis in the Eutardigrade Adorybiotus (Richtersius) coronifer: Tolerance to Alcohols, Temperature and de novo Protein Synthesis

Results showed that A. (R) coronifer in anhydrobiosis survived exposure to ethanol for less than 10 minutes whereas exposure to 1-butanol only decreased survival to 40% after the first 7 days and 1-hexanol did not change survival from the controls after thefirst 7 days.

Life History of Milnesium tardigradum Doyère (Tardigrada) under a Rearing Environment

  • A. Suzuki
  • Biology, Environmental Science
    Zoological science
  • 2003
All tardigrades in this laboratory population were female and reproduced by parthenogenesis, and the most long-lived female survived for 58 days after hatching, and laid a total of 41 eggs in 5 separate clutches.

Trehalose accumulation in the tardigrade Adorybiotus coronifer during anhydrobiosis

Data support the hypotheis that trehalose generally serves a protective role in desiccation- tolerant Metazoa, but indicate that tardigrades require only a moderate level for efficient pro- tection.

Effects of methyl bromide fumigation on anhydrobiotic micrometazoans.

This study confirms that this resistance also transfers to treatments with the fumigant methyl bromide, and the fact that anhydrobiotic organisms escape treatments with biocides should be considered a serious problem.

Mechanism allowing an insect to survive complete dehydration and extreme temperatures.

It is concluded that the brain, SG and TG do not affect the induction and termination of cryptobiotics, and hence in this higher multicellular animal cryptobiosis is independent of brain,SG and TG regulation, just as in plants or in unicellular organisms.

Protection by trehalose of DNA from radiation damage.

In the presence of 10 mM trehalose, DNA can be protected from about 4 times higher doses of beta- and gamma-ray irradiation.

Preserving tardigrades under pressure

It is shown that, in perfluorocarbon at pressures as high as 600 MPa, small terrestrial animals known as tardigrades can survive in a dehydrated state.