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Functional Analysis of Familial Asp67Glu and Thr1051Ser BRCA1 Mutations in Breast/Ovarian Carcinogenesis |
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| Authors: | Malinee Pongsavee Pimpicha Patmasiriwat Grady F. Saunders |
| Affiliation: | 1. Department of Medical Technology, Faculty of Allied Health Sciences, Thammasat University, Rangsit Campus, Pathumthani, Thailand;2. Department of Clinical Microscopy, Faculty of Medical Technology, Mahidol University, Salaya Campus, Nakornpathom, Thailand; E-Mail: (P.P.);3. Department of Biochemistry and Molecular Biology, The University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA |
| Abstract: | Estrogen is believed to be pre-initiator in the risk of breast cancer. The BRCA1 is a tumor suppressor gene associated with breast and ovarian cancer risk. This report describes functional analysis of two BRCA1 missense mutations (Asp67Glu and Thr1051Ser) observed in the familial breast/ovarian cancer patients in Thailand. Levels of luciferase activity of the two mutations were relatively lower than in the wild-type BRCA1. It is indicated that mutants may fail to promote the estrogen receptor dependent functions. It is presumed that estrogen and insulin/IGF-1 regulate c-Myc and cyclin D1 during breast cancer cell proliferation. It is also likely to affect ubiquitination mechanism. Since three affected cancer families carry the Asp67Glu mutation, it is believed that this type of mutation could have some effect on breast/ovarian cancer progression. |
| Keywords: | BRCA1 missense mutation estrogen estrogen receptor signaling pathway breast/ovarian carcinogenesis |