نتایج جستجو برای: پروتئین brca1
تعداد نتایج: 26041 فیلتر نتایج به سال:
We have previously shown that endogenous BRCA1 and overexpressed epitope-tagged BRCA1 are present in the transcription complex called the RNA polymerase II holoenzyme (holo-pol). In this study, we further characterized BRCA1 association with the holo-pol by overexpressing deletion mutants of epitope-tagged BRCA1. We found that BRCA1-associated RING domain protein (BARD1) is a component of the h...
Functional inactivation of BRCA1 is an important mechanism involved in breast cancer pathogenesis. Mutation is often responsible for BRCA1 inactivation in familial breast cancer, but is not responsible for the decreased levels of BRCA1 seen in a subset of sporadic breast cancer patients. To determine if aberrant cytosine methylation of the BRCA1 promoter is associated with decreased BRCA1 gene ...
BRCA1, the breast cancer- and ovarian cancer-specific tumor suppressor, can be a transcriptional repressor or a transcriptional activator, depending on the promoter context. To identify the genes activated or repressed by BRCA1, we have analyzed microarray results from cells depleted of BRCA1 and revealed a number of genes regulated by BRCA1 on the level of transcription. Among the genes repres...
BACKGROUND A mutation found in the BRCA1 or BRCA2 gene of a breast tumor could be either germline or somatically acquired. The prevalence of somatic BRCA1/2 mutations and the ratio between somatic and germline BRCA1/2 mutations in unselected breast cancer patients are currently unclear. PATIENTS AND METHODS Paired normal and tumor DNA was analyzed for BRCA1/2 mutations by massively parallel s...
مقدمه:سرطان پستان، شایع‌ترین بدخیمی در زنان و به‌‌عنوان اولین علت مرگ‌و‌میر ناشی از سرطان در زنان شناخته می‌شود.این بیماری به شدت ناهمگن بوده و تحت تأثیر عوامل ژنتیکی و محیطی به‌وجود می‌آید. جهش در دو ژن بسیار پرنفوذ BRCA1 و BRCA2 که نقش مهمی در ترمیم DNA دارند، علت اصلی 30-20% سرطان‌های پستان ارثی شناخته شده است. مطالعه حاضر با هدف بررسی فراوانی جهش‌های ژن BRCA1 در افراد مبتلا به سرطان پستان د...
Triple-negative breast cancer (TNBC) occurs in approximately 15% of all breast cancer patients, and the incidence of TNBC is greatly increased in BRCA1 mutation carriers. This study aimed to assess the impact of BRCA1 promoter methylation with respect to breast cancer subtypes in sporadic disease. Tissue microarrays (TMAs) were constructed representing tumors from 303 patients previously screen...
BRCA1 is critical for the maintenance of genomic stability, in part through its interaction with the Rad50.Mre11.Nbs1 complex, which occupies a central role in DNA double strand break repair mediated by nonhomologous end joining (NHEJ) and homologous recombination. BRCA1 has been shown to be required for homology-directed recombination repair. However, the role of BRCA1 in NHEJ, a critical path...
There is a clear association between germ-line BRCA1 mutations and inherited ovarian cancer; however, the association between BRCA1 mutations and sporadic ovarian cancer remains ambiguous. The frequency of BRCA1 promoter hypermethylation as an epigenetic means of BRCA1 inactivation was determined for a large, population-based cohort of ovarian cancer patients. BRCA1 promoter hypermethylation wa...
Strong inter- and intrafamilial variation of penetrance of breast and ovarian cancer is observed in BRCA1 mutation carriers. The wild-type copy of the BRCA1 gene is a plausible candidate as a cancer risk modifier given that the residual function corresponding to the intact BRCA1 allele may influence the process of tumor formation in BRCA1 carriers. Indeed, growing evidence is now becoming avail...
Background: Microarray DNA technology has paved the way for investigators to expressed thousands of genes in a short time. Analysis of this big amount of raw data includes normalization, clustering and classification. The present study surveys the application of clustering technique in microarray DNA analysis. Materials and methods: We analyzed data of Van’t Veer et al study dealing with BRCA1...
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