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Fusion Science and Technology
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EPA issues final rule regulating “forever chemicals”
The Environmental Protection Agency announced that it will issue a rule aimed at limiting public exposure to per- and polyfluoroalkyl substances (PFAS). The final rule will designate two widely used PFAS chemicals, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), as hazardous substances under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), also known as Superfund.
According to the EPA, both PFOA and PFOS meet the statutory criteria for designation as hazardous substances.
Junya Kobayashi, Michiyo Okui, Kenshi Komatsu, David J. Chen
Fusion Science and Technology | Volume 60 | Number 3 | October 2011 | Pages 1186-1189
Biology | Proceedings of the Ninth International Conference on Tritium Science and Technology | doi.org/10.13182/FST11-A12627
Articles are hosted by Taylor and Francis Online.
Werner syndrome (WS) is an autosomal recessive disorder associated with premature aging and cancer predisposition caused by mutations at the WRN gene. Several recent reports suggest that accumulation of DNA damage could lead to premature cellular aging. Therefore, WRN might function in DNA damage response, particularly DNA repair. Here, we investigated the role of WRN in DNA repair and genome integrity. WRN protein rapidly accumulated at DNA damage sites and formed discrete nuclear foci only during S phase, but not in G1 phase. WRN-defective WS cells showed the spontaneous accumulation of -H2AX (DSB marker), suggesting that WRN could function to repair the S phase-dependent DNA damage. However, WS cells showed homologous recombination (HR) at normal level, although HR repair functions preferentially during the S phase. Translesion DNA synthesis (TLS) is known as another repair pathway for S phase-dependent DNA damage. WS cells exhibit an increase in spontaneous focus formation of pol and Rad18, which are important for TLS regulation. WS cells also showed the spontaneous ubiquitination of PCNA and increased pol-related gene mutation. Taken together, WRN could work for the regulation of TLS pathway and might also be important to maintain genome integrity under a little DNA damage by tritium.