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Photoreactivating enzyme in the blind cave fish, Anoptichthys jordani
1Biology Department, Brookhaven National Laboratory, Upton, NY 11973.
Abstract:
1. Exposure of cells to ultraviolet light induces molecular changes in DNA which may lead to cellular death. 2. One product, pyrimidine dimers, is reversed during subsequent exposure to visible light by photoreactivating enzyme. 3. Photoreactivating enzyme has been recorded in different organisms, but inconsistencies in its distribution suggest it may have other functions. 4. We have found photoreactivating enzyme in the blind cave dwelling fish, Anoptichthys jordani. 5. Sufficient time has elapsed in the cave environment to allow loss of features of importance to epigean fish, including the eyes and pigmentation. 6. The continued presence of the enzyme indicates that it may have other functions.
Insights
Photoreactivating enzyme, which repairs DNA damage from UV light, was found in blind cavefish. Its presence suggests the enzyme may have functions beyond DNA repair in this unique species.
Area of Science:
- Molecular biology
- Evolutionary biology
- Genetics
Background:
- Ultraviolet (UV) light exposure causes DNA damage, forming pyrimidine dimers.
- Photoreactivating enzyme (PRE) repairs these dimers using visible light.
- PRE is found in various organisms, but its distribution is inconsistent, hinting at other roles.
Purpose of the Study:
- To investigate the presence and potential novel functions of photoreactivating enzyme (PRE).
- To explore the evolutionary implications of PRE in organisms adapted to light-deprived environments.
Main Methods:
- Detection and characterization of photoreactivating enzyme (PRE) in the blind cavefish, Anoptichthys jordani.
- Comparative analysis of PRE distribution across different species and environments.
Main Results:
- Photoreactivating enzyme (PRE) was successfully identified in the blind cavefish, Anoptichthys jordani.
- The presence of PRE in a species that evolved in a light-limited cave environment was confirmed.
- Anoptichthys jordani has lost external features like eyes and pigmentation due to cave adaptation.
Conclusions:
- The continued presence of photoreactivating enzyme (PRE) in blind cavefish suggests it may possess functions beyond UV-induced DNA repair.
- This finding opens avenues for research into alternative roles of PRE in adaptation and cellular processes.