The frequency of founder mutations in the BRCA1, BRCA2, and APC genes in Australian Ashkenazi Jews implications for the generality of U.S. population data

• Published in: Cancer Vol. 92; no. 2; pp. 440 - 445
• Main Authors: BAHAR, Anita Y, TAYLOR, Peter J, ANDREWS, Lesley, PROOS, Anne, BURNETT, Leslie, TUCKER, Katherine, FRIEDLANDER, Michael, BUCKLEY, Michael F
• Format: Journal Article
• Language: English
• Published: New York, NY Wiley-Liss 15.07.2001
• Subjects: Adult; Aged; Aged, 80 and over; APC gene; Apoptosis Regulatory Proteins; Australia - ethnology; Biological and medical sciences; BRCA2 gene; BRCA2 Protein; Breast Neoplasms - ethnology; Breast Neoplasms - etiology; Breast Neoplasms - genetics; Carcinoma - ethnology; Carcinoma - etiology; Carcinoma - genetics; DNA Mutational Analysis; Emigration and Immigration; Female; Founder Effect; Genes, APC - genetics; Genes, BRCA1 - genetics; Gynecology. Andrology. Obstetrics; Humans; Jews - genetics; Mammary gland diseases; Mass Screening; Medical sciences; Middle Aged; Neoplasm Proteins - genetics; Ovarian Neoplasms - genetics; Reference Values; Tropical medicine; Tumors; United States - ethnology; Australia; Oceania; United States; Human; Carcinoma; Prevalence; Malignant tumor; Founder effect; Epidemiology; Mammary gland diseases; Predisposition; Genetics; Mammary gland; Mutation; Public health; Tumor suppressor gene
• ISSN: 0008-543X
• DOI: 10.1002/1097-0142(20010715)92:2<440::AID-CNCR1340>3.0.CO;2-O

Several studies have shown that Ashkenazi Jews in the United States and Israel have a high prevalence of the founder mutations BRCA1 185delAG, BRCA1 5382insC, BRCA2 6174delT, and APC I1307K at frequencies of 1.0--1.1%, 0.2--0.3%, 0.6--1.4%, and 6.1--7.0%, respectively. The objective of this study was to compare the prevalence of these alleles in the Australian Jewish population with that of U.S. Jews. Australian Jews have a different history of migration, with less opportunity for changes in allele frequency due to conversion or intermarriage with non-Jewish Australians. The results obtained therefore can be used to assess whether U.S. data can be generalized to other Jewish populations. SUBJECTS AND METHODS. Subject samples were ascertained through a screening program for Tay-Sachs disease as part of a community-based screening program in New South Wales and Victoria. DNA extracted from 1200 deidentified blood samples was tested using amplification refractory mutation system polymerase chain reaction. The allele frequencies found were as follows: BRCA1 185delAG 1.25% (95% confidence interval [CI], 0.62--1.88%), BRCA1 5382insC 0.25% (95% CI, 0--0.53%), BRCA2 6174delT 1.08% (95% CI, 0.50--1.67%), and APC I1307K 8.67% (95% CI, 7.07--10.26%). The prevalence of breast carcinoma predisposition alleles therefore is greater than 2.5% in Australian Ashkenazim. There were no significant differences between the allele frequencies in Australian Ashkenazim and those identified in other studies with similar ascertainment strategies, despite the different migration patterns of Australian Jews. This suggests the broad applicability of the U.S. and Israeli data, not only to Australian Ashkenazim, but also to Ashkenazi communities throughout the world.