Repair of Genetic Damage Induced by UV-B (290–320 nm) Radiation

Tyrrell, Rex M.

doi:10.1007/978-3-642-70090-3_10

Cited by 14 publications

(4 citation statements)

References 30 publications

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“…Damage by UVB mainly results from direct photon absorption by molecules, mostly DNA and proteins (Setlow, 1960; Jagger, 1985; Tyrrell, 1986). The effects of UVA, instead, are mostly indirect, and occur through the formation of reactive oxygen species-ROS (Harrison, 1967), which cause oxidative damage to several cellular targets including DNA, RNA, proteins, and lipids.…”

Section: Causes Of Variability In Bacterial Responses To Sunlightmentioning

confidence: 99%

Away from darkness: a review on the effects of solar radiation on heterotrophic bacterioplankton activity

et al. 2013

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Heterotrophic bacterioplankton are main consumers of dissolved organic matter (OM) in aquatic ecosystems, including the sunlit upper layers of the ocean and freshwater bodies. Their well-known sensitivity to ultraviolet radiation (UVR), together with some recently discovered mechanisms bacteria have evolved to benefit from photosynthetically available radiation (PAR), suggest that natural sunlight plays a relevant, yet difficult to predict role in modulating bacterial biogeochemical functions in aquatic ecosystems. Three decades of experimental work assessing the effects of sunlight on natural bacterial heterotrophic activity reveal responses ranging from high stimulation to total inhibition. In this review, we compile the existing studies on the topic and discuss the potential causes underlying these contrasting results, with special emphasis on the largely overlooked influences of the community composition and the previous light exposure conditions, as well as the different temporal and spatial scales at which exposure to solar radiation fluctuates. These intricate sunlight-bacteria interactions have implications for our understanding of carbon fluxes in aquatic systems, yet further research is necessary before we can accurately evaluate or predict the consequences of increasing surface UVR levels associated with global change.

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Section: Causes Of Variability In Bacterial Responses To Sunlightmentioning

confidence: 99%

Away from darkness: a review on the effects of solar radiation on heterotrophic bacterioplankton activity

et al. 2013

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“…Solar‐induced CPD accumulation has been detected in terrestrial plants and aquatic plants (phytoplankton and macrophytes) from a wide range of latitudes, indicating that CPD induction can exceed repair rates(95). High levels of UV‐A radiation can ameliorate UV‐B damage to DNA through photoreactivation (90,96,97). In addition to UV‐A, blue wavelengths have also been shown to be important in photorepair (89,93,98).…”

Section: Importance Of Uv‐a and Blue Wavelengths In Repairing Uv‐b‐inmentioning

confidence: 99%

Influence of PAR and UV‐A in Determining Plant Sensitivity and Photomorphogenic Responses to UV‐B Radiation ^¶^†

Krizek

2004

Photochem & Photobiology

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The role of photosynthetically active radiation (400-700 nm) (PAR) in modifying plant sensitivity and photomorphogenic responses to ultravioletl (280-320 nm) (UV-B) radiation has been examined by a number of investigators, but few studies have been conducted on ultraviolet-A (320-400 nm) (UV-A), UV-B and PAR interactions. High ratios of PAR-UV-B and UV-A-UV-B have been found to be important in ameliorating

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“…Structural changes in DNA are considered to be one of the primary consequences of the deleterious effects of UVB on the cellular level (19,20). Cyclobutane pyrimidine dimers, especially thymine dimers (T<>T)t are the predominant lesions induced by UVB radiation (21). These photoproducts block transcription and replication of the DNA and cause mutations or even cell death (22,23).…”

Section: Introductionmentioning

confidence: 99%

Attenuation of Biologically Effective UV Radiation in Tropical Atlantic Waters Measured with a Biochemical DNA Dosimeter

et al. 1999

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A biochemical dosimeter was developed to study the attenuation of biologically effective UV radiation in marine tropical waters. Small quartz vials were used containing a solution of DNA molecules; the vials were incubated at discrete water depths. Subsequently, DNA damage was determined in these samples, using an antibody directed against thymine dimers followed by chemiluminescent detection. Measurements of DNA damage were compared with calculated biologically effective doses, as derived from spectroradiometer measurements. The biodosimeter was found to be a reliable and easy tool to determine levels of harmful UV radiation in marine waters. The highest attenuation coefficient (1.60 m-l) measured with the biochemical dosimeter was found in eutrophic waters. at a coastal station off Curapcao, Netherlands Antilles. At the other stations attenuation coefficients ranged from 0.18 m-* in central Atlantic waters to 0.43 m close to the Curapcao coast line. Latter results indicate that biologically effective UV radiation may easily reach ecologically significant depths, e.g. coral reef communities. /spectroradioiiieter K,, dosimetedspectroradiometer, YS, pigment K,, dosinieter/spectroradionieter, YS, pigment K,,, dosimeter, YS. pigment YS, pigment K,, dosimetedspectroradiometer, YS, pigment K,, dosiiiieter/spectroradiometer, YS. pigment K,,, dosimeter. YS, pigment K , . , dosimeter/spectroradiometer, YS, pigment K,,, dosimetedspectroradiometer, Y S, pigment K,, dosimeter, YS. pigment *Type of measurements: K,, = measuring biologically effective attenuation coefficients; comp. dosimeter/spectroradiometer = comparison DNA dosimeter with spectroradiometer: YS = yellow substance measurements: pigment = chlorophyll a determination.

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Repair of Genetic Damage Induced by UV-B (290–320 nm) Radiation

Cited by 14 publications

References 30 publications

Away from darkness: a review on the effects of solar radiation on heterotrophic bacterioplankton activity

Away from darkness: a review on the effects of solar radiation on heterotrophic bacterioplankton activity

Influence of PAR and UV‐A in Determining Plant Sensitivity and Photomorphogenic Responses to UV‐B Radiation ^¶^†

Attenuation of Biologically Effective UV Radiation in Tropical Atlantic Waters Measured with a Biochemical DNA Dosimeter

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Repair of Genetic Damage Induced by UV-B (290–320 nm) Radiation

Cited by 14 publications

References 30 publications

Away from darkness: a review on the effects of solar radiation on heterotrophic bacterioplankton activity

Away from darkness: a review on the effects of solar radiation on heterotrophic bacterioplankton activity

Influence of PAR and UV‐A in Determining Plant Sensitivity and Photomorphogenic Responses to UV‐B Radiation ¶†

Attenuation of Biologically Effective UV Radiation in Tropical Atlantic Waters Measured with a Biochemical DNA Dosimeter

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Influence of PAR and UV‐A in Determining Plant Sensitivity and Photomorphogenic Responses to UV‐B Radiation ^¶^†