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BRCA1 R841W: a strong candidate for a common mutation with moderate phenotype
D F Barker1, E R Almeida, G Casey
1Department of Physiology, University of Utah Health Sciences Center, Salt Lake City, USA. david.f.barken@m.cc.utah.edu
Genetic Epidemiology
|January 1, 1996
Summary
A novel BRCA1 gene mutation, R841W, is linked to hereditary breast and ovarian cancer. This finding suggests R841W may be a significant cause of these cancers in the population.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- BRCA1 mutations significantly increase breast and ovarian cancer risk, often with early onset.
- Recurrent BRCA1 mutations are responsible for many hereditary cancer predisposition cases.
- Studying identical BRCA1 lesions allows for genotype-phenotype and genotype-environment interaction analysis.
Purpose of the Study:
- To identify and characterize novel mutations in the BRCA1 gene.
- To investigate the frequency and potential etiological role of the R841W variant in breast and ovarian cancers.
- To assess genotype-phenotype correlations associated with the R841W mutation.
Main Methods:
- Case-control study design.
- Genetic sequencing to identify BRCA1 mutations.
- Analysis of family histories and cancer incidence in relation to the R841W variant.
Main Results:
- A novel missense mutation, 2640 C-->T (R841W), was identified in three breast/ovarian cancer cases.
- Strong family histories of cancer and high concordance of cancer incidence with R841W were observed.
- R841W was found in approximately 1% of the studied breast and ovarian cancer population.
Conclusions:
- The R841W variant is likely an etiologically significant BRCA1 lesion.
- R841W may be involved in a notable proportion of breast and ovarian cancers.
- Further research is warranted to understand the full impact of R841W on cancer risk.