Comparative Study of Gamma Radiation Tolerance between Desiccation-Sensitive and Desiccation-Tolerant Tardigrades.

IF 1 4区 生物学 Q3 ZOOLOGY
Tokiko Saigo, Katsuya Satoh, Takekazu Kunieda
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引用次数: 0

Abstract

Tardigrades are small metazoans renowned for their exceptional tolerance against various harsh environments in a dehydrated state. Some species exhibited an extraordinary tolerance against high-dose irradiation even in a hydrated state. Given that natural sources of high radiation are rare, the selective pressure to obtain such a high radiotolerance during evolution remains elusive. It has been postulated that high radiation tolerances could be derived from adaptation to dehydration, because both dehydration and radiation cause similar damage on biomolecules at least partly, e.g., DNA cleavage and oxidation of various biomolecules, and dehydration is a common environmental stress that terrestrial organisms should adapt to. Although tardigrades are known for high radiotolerance, the radiotolerance records have been reported only for desiccation-tolerant tardigrade species and nothing was known about the radiotolerance in desiccation-sensitive tardigrade species. Hence, the relationship between desiccation-tolerance and radiotolerance remained unexplored. To this end, we examined the radiotolerance of the desiccation-sensitive tardigrade Grevenius myrops (formerly known as Isohypsibius myrops) in comparison to the well-characterized desiccation-tolerant tardigrade, Ramazzottius varieornatus. The median lethal dose (LD50) of G. myrops was approximately 2240 Gy. This was much lower than those reported for desiccation tolerant eutardigrades. The effects of irradiation on the lifespan and the ovipositions were more severe in G. myrops compared to those in R. varieornatus. The present study provides precise records on the radiotolerance of a desiccation-sensitive tardigrade and the current data supported the correlation between desiccation tolerance and radiotolerance at least in eutardigrades.

干燥敏感缓步动物与耐干燥缓步动物对伽马辐射耐受性的比较研究。
缓步动物是一种小型后生动物,以其在脱水状态下对各种恶劣环境的特殊耐受性而闻名。有些物种甚至在水合状态下也表现出对高剂量辐射的非凡耐受性。鉴于高辐射的天然来源是罕见的,在进化过程中获得如此高的辐射耐受性的选择压力仍然是难以捉摸的。据推测,高辐射耐受性可能源于对脱水的适应,因为脱水和辐射至少在一定程度上对生物分子造成类似的损伤,例如DNA切割和各种生物分子的氧化,而脱水是陆地生物应该适应的常见环境压力。虽然缓步动物具有较高的放射耐受性,但仅报道了耐干燥缓步动物的放射耐受性记录,而对干燥敏感缓步动物的放射耐受性一无所知。因此,干燥耐受性和辐射耐受性之间的关系仍未被探索。为此,我们研究了干燥敏感缓步动物Grevenius myrops(以前称为isohypibius myrops)的放射耐受性,并与具有良好特征的干燥耐受性缓步动物Ramazzottius varieornatus进行了比较。中位致死剂量(LD50)约为2240 Gy。这比报道的耐干燥的准水生物要低得多。辐照对天鼠的寿命和产卵的影响比异斑天鼠更严重。本研究提供了干燥敏感缓步动物辐射耐受性的精确记录,目前的数据支持至少在半缓步动物中干燥耐受性和辐射耐受性之间的相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Zoological Science
Zoological Science 生物-动物学
CiteScore
1.70
自引率
11.10%
发文量
59
审稿时长
1 months
期刊介绍: Zoological Science is published by the Zoological Society of Japan and devoted to publication of original articles, reviews and editorials that cover the broad field of zoology. The journal was founded in 1984 as a result of the consolidation of Zoological Magazine (1888–1983) and Annotationes Zoologicae Japonenses (1897–1983), the former official journals of the Zoological Society of Japan. Each annual volume consists of six regular issues, one every two months.
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