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Radiation-induced cleavage delay in Chaetopterus eggs

Journal Article · · Biol. Bull.; (United States)
OSTI ID:7151659
;
X-irradiation of either the eggs or the sperm of sea urchins is known to lead to mitotic delay which, over a wide range of doses, is proportional to the logarithm of the exposure. Similarly, sea urchin eggs exhibit a uv-induced mitotic delay which is exponentially dependent on dose. Exposure of either the eggs or sperm of Chaetopterus pergamentaceus to ..gamma..-radiation results in a cleavage delay which is proportional to the logarithm of the dose. The sperm are significantly more sensitive than the eggs. This observation contrasts with our data on Arbacia which indicate identical sensitivities of the gametes at low doses and a hypersensitivity of the eggs at high ones. Ultraviolet irradiation of Chaetopterus sperm leads to a cleavage delay which is proportional to the logarithm of the dose. In contrast, the uv dose-dependence of the eggs is linear. There is a postfertilization increase in uv-sensitivity followed by a biphasic loss of sensitivity. Sea urchin eggs exhibit a similar pattern of sensitivity changes to ..gamma..-radiation; however, the uv pattern differs. There is a uv-sensitivity plateau followed by a linear loss of sensitivity. The differences between the responses of these two animals may provide a useful framework for the future analysis of the radiation sensitive mitotic events. (auth)
OSTI ID:
7151659
Journal Information:
Biol. Bull.; (United States), Journal Name: Biol. Bull.; (United States) Vol. 149:2; ISSN BIBUA
Country of Publication:
United States
Language:
English

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Related Subjects

560154* -- Radiation Effects on Animals-- Basic Studies-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
ANNELIDS
AQUATIC ORGANISMS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
CELL DIVISION
COMPARATIVE EVALUATIONS
DOSE-RESPONSE RELATIONSHIPS
ECHINODERMS
EGGS
ELECTROMAGNETIC RADIATION
GAMETES
GAMMA RADIATION
GERM CELLS
INVERTEBRATES
IONIZING RADIATIONS
IRRADIATION
MITOSIS
RADIATION EFFECTS
RADIATIONS
RADIOSENSITIVITY
SEA URCHINS
SPERMATOZOA
ULTRAVIOLET RADIATION