نتایج جستجو برای: xrcc4
تعداد نتایج: 389 فیلتر نتایج به سال:
Nonhomologous end-joining (NHEJ) repairs DNA double-strand breaks (DSBs) during V(D)J recombination in developing lymphocytes and during immunoglobulin (Ig) heavy chain (IgH) class switch recombination (CSR) in peripheral B lymphocytes. We now show that CD21-cre-mediated deletion of the Xrcc4 NHEJ gene in p53-deficient peripheral B cells leads to recurrent surface Ig-negative B lymphomas ("CXP ...
background: after radiation therapy (rt), some health hazards including dna damages may occur where melatonin can play a protective role due to free radical generation. on the other hand, serious accidental overexposures may occur during rt due to nuclear accidents which necessitate the need for study on exposure to high-dose radiations during treatments. objective: the aim of this study was to...
اختلال دوقطبی یک ناهنجاری روانی جدی است که جزء مهمترین عوامل ناتوانی در میان بیماری های روانی محسوب می شود و حدود یک درصد از جمعیت را تحت تاثیر قرار می دهد. استرس اکسیداتیو در فیزیولوژی آسیب بیماران مبتلا به اختلال دوقطبی نقش مهمی بازی می کند و مطالعات از افزایش آسیب های dna ناشی از این استرس در این بیماران خبر می دهند. xrcc4 و xrcc5 پروتئین های درگیر در مسیر ترمیمی non-homologous end joining (...
The covalent rejoining of DNA ends at single-stranded or double-stranded DNA breaks is catalyzed by DNA ligases. Four DNA ligase activities (I-IV) have been identified in mammalian cells [1]. It has recently been demonstrated that DNA ligase IV interacts with and is catalytically stimulated by the XRCC4 protein [2,3], which is essential for DNA double-strand break repair and the genomic rearran...
BACKGROUND Nonhomologous end-joining (NHEJ) is the major DNA double-strand break (DSB) repair mechanism in human cells. The final rejoining step requires DNA ligase IV (LIG4) together with the partner proteins X-ray repair cross-complementing protein 4 (XRCC4) and XRCC4-like factor. Patients with mutations in genes encoding LIG4, XRCC4-like factor, or the other NHEJ proteins DNA-dependent prote...
Nonhomologous end joining repairs DNA double-strand breaks created by ionizing radiation and V(D)J recombination. Ku, XRCC4/Ligase IV (XL) and XLF have a remarkable mismatched end (MEnd) ligase activity, particularly for ends with mismatched 3' overhangs, but the mechanism has remained obscure. Here, we showed XL required Ku to bind DNA, while XLF required both Ku and XL to bind DNA. We detecte...
BACKGROUND After radiation therapy (RT), some health hazards including DNA damages may occur where melatonin can play a protective role due to free radical generation. On the other hand, serious accidental overexposures may occur during RT due to nuclear accidents which necessitate the need for study on exposure to high-dose radiations during treatments. OBJECTIVE The aim of this study was to...
DNA ligase IV is the most recently identified member of a family of enzymes joining DNA strand breaks in mammalian cell nuclei [1] [2]. The enzyme occurs in a complex with the XRCC4 gene product [3], an interaction mediated via its unique carboxyl terminus [4] [5]. Cells lacking XRCC4 are hypersensitive to ionising radiation and defective in V(D)J recombination [3] [6], implicating DNA ligase I...
A DNA ligase IV (LIG4)-null human pre-B cell line and human cell lines with hypomorphic mutations in LIG4 are signi®cantly impaired in the frequency and ®delity of end joining using an in vivo plasmid assay. Analysis of the null line demonstrates the existence of an error-prone DNA ligase IV-independent rejoining mechanism in mammalian cells. Analysis of lines with hypomorphic mutations demonst...
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