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DNA double-strand breaks (DSBs) are highly deleterious lesions and their misrepair can promote genomic instability, a hallmark of cancer. DNA-end resection is a cell cycle-regulated mechanism that is required for the faithful repair of DSBs. We recently discovered that the anaphase-promoting complex/cyclosome-Cdh1 (APC/C(Cdh1)) ubiquitin ligase is responsible for the timely degradation of CtBP-interacting protein (CtIP), a key DNA-end resection factor, providing a new layer of regulation of DSB repair in human cells.
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http://dx.doi.org/10.1080/23723556.2014.1000696 | DOI Listing |
Nat Cell Biol
September 2025
State Key Laboratory of Oncology in South China, Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-sen University Cancer Center, Guangzhou, China.
The ataxia telangiectasia mutated (ATM) kinase orchestrates the early stages of DNA double-strand break repair by promoting hyperphosphorylation of CtIP, a key step in the initiation of DNA end resection. However, the regulatory mechanisms controlling resection extent remain incompletely understood. Here we identify ERCC6L2 as a key regulator of DNA end resection in response to ATM inhibition.
View Article and Find Full Text PDFGaucher disease type 1 is a lysosomal storage disorder caused by mutations that reduce glucocerebrosidase activity, leading to glycolipid buildup, particularly in macrophages. To develop a curative approach, we established a high-efficiency genome editing platform for human and murine hematopoietic stem-progenitor cells using CRISPR/Cas9, recombinant adeno-associated virus serotype 6. To enhance homology-directed DNA repair while minimizing genotoxicity, we incorporated a new 53BP1 inhibitor, a ubiquitin variant that promotes DNA end resection and significantly increases editing efficiency.
View Article and Find Full Text PDFDNA Repair (Amst)
August 2025
Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; Chromosome and Cellular Dynamics Section, Institute of Medical Sciences, University of Aberdeen, Aberdeen AB25 2ZD, UK. Electronic address:
Meiosis generates reproductive cells with a reduced genome complement, with most species using homologous recombination to promote accurate meiotic chromosome segregation and to generate genetic diversity among offspring. A critical step in homologous recombination is DNA end resection, in which DNA double-strand breaks (DSBs) are processed by nucleases to yield the 3' single-stranded DNA (ssDNA) needed for homology search and strand invasion. DSB resection in nonmeiotic contexts has been extensively studied, but meiotic resection is less well understood.
View Article and Find Full Text PDFInt J Biol Macromol
September 2025
School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India. Electronic address:
WHO has listed Candida albicans as a fungal pathogen of priority. With the increasing incidence of C. albicans infection and limited treatment strategies, the identification of new drug targets and inhibitor molecules is of global concern.
View Article and Find Full Text PDFMethods Mol Biol
August 2025
Faculty of Science, Kyushu University, Fukuoka, Japan.
The nucleoplasmic extract (NPE) of Xenopus laevis eggs contains a physiological concentration of nuclear proteins that recapitulate a functional nuclear environment. This system has been widely used to study key nuclear processes, including DNA replication, repair, transcription, and chromatin assembly. Its soluble nature, free from membrane fractions and insoluble structures, enables direct analysis of nuclear responses to specific DNA structures and lesions.
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