Back to David's theory of evolution: God's error corrections (Evolution)

by David Turell , Saturday, August 22, 2020, 22:06 (1552 days ago) @ David Turell

Double strand DNA breaks have cellular repair mechanisms. Thistudy has a method to follow the mechanisms:

https://www.sciencedaily.com/releases/2020/08/200821141154.htm

"A new bioluminescent reporter that tracks DNA double stranded break (DSB) repair in cells has been developed by researchers from Massachusetts General Hospital (MGH) and the Academia Sinica in Taiwan. The international team's novel bioluminescent repair reporter (BLRR)-based system can be used to monitor DNA repair pathways directly in animals as well as cell lines. No such system previously existed for in vivo studies. These pathways play a crucial role in multiple conditions, including cancer.

"'One of the main reasons cancer cells are resistant to treatment is that they can inherently repair the DNA damage caused by radiation and chemotherapy," explains Christian Elias Badr, PhD, investigator in the Department of Neurology at MGH and co-senior author of the paper. The study's other co-senior author is Charles Pin-Kuang Lai, PhD, at the Academia Sinica in Taiwan.

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"A cell may recognize the damage and use its intrinsic DNA damage response (DDR) to reduce DSB-caused cell death. As a result, the cancer cell's own DNA repair mechanisms can promote drug resistance and recurrence in some malignancies. Researchers would like to know more about them.

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"BLRR uses secreted Gaussia and Vargula luciferases to detect homology-directed repair (HDR) and non-homologous end joining (NHEJ) -- the two major pathways to DSB repair. Using BLRR. Researchers can track HDR and NHEJ-related activities over time in cells. It also detects DSB repairs in xenografted tumors in vivo."

Comment: this article indirectly informs us that cells have more than one system to repair broken DNA double strands. These repair mechanisms must be present to maintain life.