کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1919226 1535620 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Arresting transcription and sentencing the cell: The consequences of blocked transcription
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی سالمندی
پیش نمایش صفحه اول مقاله
Arresting transcription and sentencing the cell: The consequences of blocked transcription
چکیده انگلیسی


• Polymerase is considered in broad view of mRNP assembly.
• An updated TC-NER model is presented.
• Arrested polymerases as processive DNA damage sensors are discussed.
• Therapeutic implications of targeting CS proteins are discussed.

Bulky DNA adducts induced by agents like ultraviolet light, cisplatin and oxidative metabolism pose a block to elongation by RNA polymerase II (RNAPII). The arrested RNAPII can initiate the repair of transcription-blocking DNA lesions by transcription-coupled nucleotide excision repair (TC-NER) to permit efficient recovery of mRNA synthesis while widespread sustained transcription blocks lead to apoptosis. Therefore, RNAPII serves as a processive DNA damage sensor that identifies transcription-blocking DNA lesions. Cockayne syndrome (CS) is an autosomal recessive disorder characterized by a complex phenotype that includes clinical photosensitivity, progressive neurological degeneration and premature-aging. CS is associated with defects in TC-NER and the recovery of mRNA synthesis, making CS cells exquisitely sensitive to a variety of DNA damaging agents. These defects in the coupling of repair and transcription appear to underlie some of the complex clinical features of CS. Recent insight into the consequences of blocked transcription and their relationship to CS will be discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanisms of Ageing and Development - Volume 134, Issues 5–6, May–June 2013, Pages 243–252
نویسندگان
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