Kamon Phochana. Variant analysis at 5' and 3' untranslated regions of BRCA2 in Thai familial breast and ovarian cancer . Master's Degree(Medical Technology). Mahidol University. : Mahidol University, 2004.
Variant analysis at 5' and 3' untranslated regions of BRCA2 in Thai familial breast and ovarian cancer
Abstract:
Breast cancer is the most common malignancy among women. Genetic susceptibility has been estimated to contribute in 5-10 % of all breast cancer cases. Two breast cancer susceptibility genes, BRCA1 and BRCA2 are thought to account for approximately 80% of inherited breast and / or ovarian cancer cases.
A total of 20 patients and 7 unaffected cancer patients relatives from Thailand with breast and / or ovarian cancer were screened for DNA variants at 5' and 3' untranslated regions (UTR) of BRCA2 gene. These patients were previously assigned as BRCA1 and BRCA2 mutation negative cases. In 20 cancer patients, DNA alteration were found in both 5' and 3'UTR of BRCA2. A majority of patients with 5'UTR variant presents the variants within subregion 1 and 5 encompassing nucleotide 1140 to 727 and +105 to +614(see text), respectively. The 5'UTR changes were seen in 11/20 of the cancer patients (55%) in both sub-1 and sub-5 regions. Eight of twenty cancer patients possess 3'UTR variant (40%) and the alteration occurs only at subregion 1. altogether, the frequency of cancer patients with either 5' or 3'UTR variant, or both was 95%. These results suggest that patients with variants at 5' and 3'UTR of BRCA2 gene and the development of breast and / or ovarian cancer might be related. The patients relatives who have 5' and / or 3'UTR variants of BRCA2 also probably indicate an increase risk of breast and ovarian cancer.